path: root/doc/rfc/rfc3371.txt

Network Working Group                                           E. Caves
Request for Comments: 3371                                Occam Networks
Category: Standards Track                                     P. Calhoun
                                                    Black Storm Networks
                                                              R. Wheeler
                                                     DoubleWide Software
                                                             August 2002


                  Layer Two Tunneling Protocol "L2TP"
                      Management Information Base


Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

Abstract

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in TCP/IP-based internets.
   In particular, it defines objects for managing networks using Layer 2
   Tunneling Protocol (L2TP).




















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Table of Contents

   1.0      Introduction   ..........................................  2
   2.0      The SNMP Management Framework ...........................  2
   3.0      Overview ................................................  4
   3.1      Relationship to the Interface MIB........................  5
   3.1.1    Layering Model ..........................................  5
   3.1.2    Interface MIB Object.....................................  7
   3.1.2.1  L2TP Tunnel Interfaces ..................................  7
   3.2      Relationship to other MIBs .............................. 10
   3.2.1    Relationship to the IP Tunnel MIB ....................... 10
   3.3      L2TP Tunnel Creation .................................... 10
   3.4      L2TP Session Mapping .................................... 10
   4.0      L2TP Object Definitions ................................. 11
   5.0      Security Considerations ................................. 66
   6.0      Acknowledgements ........................................ 67
   7.0      References .............................................. 67
   8.0      Authors' Addresses ...................................... 69
   9.0      Full Copyright Statement ................................ 70

1.0 Introduction

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet Community.
   In particular, it describes managed objects used for managing L2TP
   devices.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

2.0 The SNMP Management Framework

   The SNMP Management Framework presently consists of five major
   components:

   o An overall architecture, described in RFC 2571 [RFC2571].

   o Mechanisms for describing and naming objects and events for the
     purpose of management.  The first version of this Structure of
     Management Information (SMI) is called SMIv1 and described in STD
     16, RFC 1155 [RFC1155], STD 16, RFC 1212 [RFC1212] and RFC 1215
     [RFC1215].  The second version, called SMIv2, is described in STD
     58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC
     2580 [RFC2580].






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   o Message protocols for transferring management information.  The
     first version of the SNMP message protocol is called SNMPv1 and
     described in STD 15, RFC 1157 [RFC1157].  A second version of the
     SNMP message protocol, which is not an Internet standards track
     protocol, is called SNMPv2c and described in RFC 1901 [RFC1901] and
     RFC 1906 [RFC1906].  The third version of the message protocol is
     called SNMPv3 and described in RFC 1906 [RFC1906], RFC 2572
     [RFC2572] and RFC 2574 [RFC2574].

   o Protocol operations for accessing management information.  The
     first set of protocol operations and associated PDU formats is
     described in STD 15, RFC 1157 [RFC1157].  A second set of protocol
     operations and associated PDU formats is described in RFC 1905
     [RFC1905].

   o A set of fundamental applications described in RFC 2573 [RFC2573]
     and the view-based access control mechanism described in RFC 2575
     [RFC2575].

   A more detailed introduction to the current SNMP Management Framework
   can be found in RFC 2570 [RFC2570].

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  Objects in the MIB are
   defined using the mechanisms defined in the SMI.

   This memo specifies a MIB module that is compliant to the SMIv2.  A
   MIB conforming to the SMIv1 can be produced through the appropriate
   translations.  The resulting translated MIB must be semantically
   equivalent, except where objects or events are omitted because no
   translation is possible (use of Counter64).  Some machine readable
   information in SMIv2 will be converted into textual descriptions in
   SMIv1 during the translation process.  However, this loss of machine
   readable information is not considered to change the semantics of the
   MIB.
















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3.0 Overview

   The objects defined in this MIB are to be used when describing Layer
   Two Tunneling Protocol (L2TP) tunnels.  The L2TP protocol is defined
   in [RFC2661].  This MIB consists of seven groups briefly described
   below:

   l2tpConfigGroup
   l2tpStatsGroup
      These two groups of objects provide information on the
      configuration, state and statistics of the L2TP protocol, its
      tunnels and sessions.  These groups are mandatory for implementors
      of this MIB.

   l2tpDomainGroup
      This optional group of objects provides configuration, state and
      statistical information for L2TP tunnel endpoint domains.  A L2TP
      tunnel endpoint domain is considered to be a collection of L2TP
      devices typically belonging to a common administrative domain or
      geographic location.

   l2tpMappingGroup
      This optional group contains mapping tables to assist management
      applications to map between protocol identifiers and table
      indices.

   l2tpIpUdpGroup
      This group provides the state and statistics information for L2TP
      tunnels which are being transported by UDP/IP.  This group is
      mandatory for L2TP implementations that support L2TP over UDP/IP.

   l2tpSecurityGroup
      This group is optional for SNMP agents which support both
      authentication and privacy of SNMP messages for the management of
      L2TP keys.

   l2tpTrapGroup
      This group contains the notifications that could be generated by a
      L2TP implementation.

   l2tpHCPacketGroup
         This group is optional for L2TP implementations that could
         potentially overflow the L2TP Domain tables 32-bit statistics
         counters in less than an hour.







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3.1 Relationship to the Interface MIB

   This section clarifies the relationship of this MIB to the Interfaces
   MIB [RFC2863].  Several areas of correlation are addressed in the
   following subsections.  The implementor is referred to the Interfaces
   MIB document in order to understand the general intent of these
   areas.

3.1.1  Layering Model

   This MIB contains several tables which are extensions to the IP
   Tunnel MIB described in [RFC2667] which itself defines extensions to
   the Interface MIB [RFC2863].  An L2TP tunnel is represented as a
   separate identifiable logical interface sub-layer.  The tunnel stack
   layering model is described in [RFC2667].

   In addition to that described in [RFC2667] an L2TP tunnel will not be
   at the top of the ifStack on a L2TP device that is acting as a L2TP
   Network Server (LNS).  In this case PPP interfaces will be layered on
   top of the tunnel interface.































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   In the example diagram below, the interface layering is shown as it
   might appear at the LNS.

       +--------------------------------------------+
       |           Network Layer Protocol           |
       +-+-----------+-------------+--------+-------+
         |           |             |        |
         |         +-+--+          |        |
         |         |MPPP|          |        |    <=== PPP Multilink I/F
         |         ++--++          |        |
         |          |  |           |        |
         |       +--+  +--+        |        |
         |       |        |        |        |
         |     +-+-+    +-+-+    +-+-+    +-+-+
         |     |PPP|    |PPP|    |PPP|    |PPP|  <=== PPP I/F
         |     +-+-+    +-+-+    +-+-+    +-+-+
         |       |        |        |        |
         |  +----+--------+--------+--------+----+
         |  |           L2TP Tunnel I/F          |
         |  +------------------+-----------------+
         |                     |
       +-+---------------------+------+
       |            Ethernet          |
       +------------------------------+

   The ifStackTable is used to describe the layering of the interface
   sub-layers.  For the example given above the ifTable and ifStackTable
   may appear as follows:

   ifIndex ifType        Tunnel MIB tables       Description

      1    ethernetCsmacd(6)                     Ethernet interface
      2    tunnel(131)   tunnelIfTable           Tunnel interface
                         l2tpTunnelConfigTable
                         l2tpTunnelStatsTable
      3    ppp(23)                               PPP interface #1
      4    ppp(23)                               PPP interface #2
      5    ppp(23)                               PPP interface #3
      6    ppp(23)                               PPP interface #4
      7    mlppp(108)                            MLPPP interface











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   The corresponding ifStack table entries would then be:

           ifStackTable Entries

           HigherLayer  LowerLayer
           0            5
           0            6
           0            7
           1            0
           2            1
           3            2
           4            2
           5            2
           6            2
           7            3
           7            4

   L2TP Access Concentrator (LAC) tunnel interfaces on the other hand
   appear at the top of the interface layering stack.  In this case the
   layering model is as described in [RFC2667].

   However in order to support the tunneling of packets received from
   interfaces carrying framed PPP packets on the LAC to the LNS (and the
   propagation of decapsulated PPP packets to that interface) additional
   configuration is required.  This is further described in section 3.4.

3.1.2  Interface MIB Objects

   Except where noted in the tables below, all objects MUST be supported
   from the ifGeneralInformationGroup and one of the following three
   groups:

      o ifPacketGroup OR
      o ifHCPacketGroup OR
      o ifVHCPacketGroup

   depending on the particular implementation.

   The following tables describe how objects from the
   ifGeneralInformationGroup and ifPacketGroup (similar support should
   be provided for the high and very high capacity packet groups) are to
   be interpreted and supported for L2TP tunnel interfaces.

3.1.2.1  L2TP Tunnel Interfaces

   All Interface MIB objects not listed in the above groups for L2TP
   tunnel interfaces MUST be supported as described in [RFC2863].




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      Interface MIB Object    Support Description
      ====================    ========================================
      ifTable.ifDescr         Refer to the Interface MIB.

      ifTable.ifType          tunnel(131).

      ifTable.ifMtu           Dependent on the tunnel transport layer.
                              For UDP/IP transports the MTU should
                              be 65467 (65535-60(IP)-8(UDP)).

      ifTable.ifSpeed         Return zero.

      ifTable.ifPhyAddress    The assigned tunnel identifier.

      ifTable.ifAdminStatus   Setting ifAdminStatus to 'up' injects a
                              'Local Open' request into the tunnel FSM.
                              Setting ifAdminStatus to 'down' injects
                              a 'Tunnel Close' event into the tunnel
                              FSM.  Setting ifAdminStatus to 'testing'
                              is not currently defined but could be
                              used to test tunnel connectivity.

      ifTable.ifOperStatus    ifOperStatus values are to be interpreted
                              as follows:
                              'up'             - tunnel is established.
                              'down'           - administratively down
                                                 or peer unreachable.
                              'testing'        - in some test mode.
                              'unknown'        - status cannot be
                                                 determined for some
                                                 reason.
                              'dormant'        - operational but
                                                 waiting for local or
                                                 remote trigger to bring
                                                 up the tunnel.
                              'notPresent'     - configuration missing.
                              'lowerLayerDown' - down due to state of
                                                 lower-layer
                                                 interface(s).

      ifTable.ifInOctets      The total number of octets received on the
                              tunnel including control and payload
                              octets.

      ifTable.ifInUcastPkts   The total number of packets received on
                              the tunnel including control and payload
                              packets.




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      ifTable.ifInDiscards    The total number of received packets that
                              were discarded on both control and payload
                              channels.

      ifTable.ifInErrors      The total number of packets received in
                              error including control and payload
                              packets.

      ifTable.ifInUnknownProtos
                              Return zero.

      ifTable.ifOutOctets     The total number of octets transmitted
                              from the tunnel including control and
                              payload octets.

      ifTable.ifOutUcastPkts  The total number of packets transmitted
                              from the tunnel including control and
                              payload packets.

      ifTable.ifOutDiscards   The total number of discarded packets that
                              were requested to be transmitted including
                              control and payload packets.

      ifTable.ifOutErrors     The total number of packets that were
                              requested to be transmitted that were in
                              error including control and payload
                              packets.

      ifXTable.ifName         Refer to the Interface MIB.

      ifXTable.ifInMulticastPkts
                              Return zero.

      ifXTable.ifInBroadcastPkts
                              Return zero.

      ifXTable.ifOutMulticastPkts
                              Return zero.

      ifXTable.ifOutBroadcastPkts
                              Return zero.

      ifXTable.ifOutBroadcastPkts
                              Return zero.

      ifXTable.ifLinkUpDownTrapEnable
                              Default set to enabled(1).




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      ifXTable.ifHighSpeed    Return zero.

      ifXTable.ifPromiscuousMode
                              Set to false(2).

      ifXTable.ifConnectorPresent
                              Set to false(2).

3.2  Relationship to other MIBs

3.2.1  Relationship to the IP Tunnel MIB

   The IP Tunnel MIB [RFC2667] describes tunnel interfaces that have an
   ifType of tunnel(131).  The IP Tunnel MIB is considered to contain a
   collection of objects common to all IP tunneling protocols, including
   L2TP.  In addition to the IP Tunnel MIB, tunnel encapsulation
   specific MIBs (like this MIB) extend the IP Tunnel MIB to further
   describe encapsulation specific information.  Implementation of the
   IP Tunnel MIB is required for L2TP tunnels over IP.

3.3  L2TP Tunnel Creation

   Tunnel creation is detailed for tunnels over IP in the IP Tunnel MIB.
   The creation of a tunnelIfEntry in [RFC2667] when the encapsulation
   method is "l2tp" will have the side effect of creating entries in the
   l2tpTunnelConfigTable, l2tpTunnelStatsTable and the
   l2tpUdpStatsTable's.

   The creation of L2TP tunnel interfaces over transports other than IP
   is expected to be defined in the MIB definition for that specific
   L2TP tunnel transport.

3.4  L2TP Session Mapping

   The l2tpSessionMapTable table allows management applications to
   determine which session within a tunnel a particular interface
   (either a PPP or DS0 interface) is mapped to.  On the LAC it also
   provides a management application the ability to map a particular
   physical or virtual interface terminating a PPP link to a particular
   L2TP tunnel.  This is required since the interface stacking as
   performed (and instrumented by the ifStackTable) on the LNS cannot be
   applied at the LAC.









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   The following diagram illustrates the conceptual binding that occurs.

             +---------------------------------------+
             |       L2TP Session Map Database       |
             +----------+-----------------+----------+
                        |                 |
                    +---+---+       +-----+------+
                    |  ds0  |       | Tunnel I/F |
                    +---+---+       +-----+------+
                        |                 |
                    +---+---+       +-----+------+
                    |  ds1  |       |  Ethernet  |
                    +-------+       +------------+

   The stacking of the individual interface stacks would be described by
   the ifStackTable.

4.0 L2TP Object Definitions

   L2TP-MIB DEFINITIONS ::= BEGIN

   IMPORTS
           Integer32, Unsigned32, Counter32, Gauge32,
           Counter64, transmission, MODULE-IDENTITY,
           OBJECT-TYPE, NOTIFICATION-TYPE
               FROM SNMPv2-SMI
           TEXTUAL-CONVENTION, RowStatus, TruthValue,
           StorageType
               FROM SNMPv2-TC
           SnmpAdminString
               FROM SNMP-FRAMEWORK-MIB
           OBJECT-GROUP, MODULE-COMPLIANCE, NOTIFICATION-GROUP
               FROM SNMPv2-CONF
           InterfaceIndex
               FROM IF-MIB;

   l2tp    MODULE-IDENTITY
           LAST-UPDATED    "200208230000Z" -- 23 August 2002
           ORGANIZATION    "IETF L2TP Working Group"
           CONTACT-INFO
             "Evan Caves
              Postal: Occam Networks
                      77 Robin Hill Road
                      Santa Barbara, CA, 93117
              Tel:    +1 805692 2900
              Email:  evan@occamnetworks.com

              Pat R. Calhoun



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              Postal: Black Storm Networks
                      110 Nortech Parkway
                      San Jose, CA, 95143
              Tel:    +1 408 941-0500
              Email:  pcalhoun@bstormnetworks.com

              Ross Wheeler
              Postal: DoubleWide Software, Inc.
                      2953 Bunker Hill Lane
                      Suite 101
                      Santa Clara, CA 95054
              Tel:    +1 6509260599
              Email:  ross@doublewidesoft.com

              Layer Two Tunneling Protocol Extensions WG
              Working Group Area:    Internet
              Working Group Name:    l2tpext
              General Discussion:    l2tp@l2tp.net"

           DESCRIPTION
              "The MIB module that describes managed objects of
               general use by the Layer Two Transport Protocol."

           -- revision log

           REVISION        "200208230000Z" -- 23 August 2002
           DESCRIPTION
              "First revision, published as RFC 3371."

           ::= { transmission 95 }

   --
   --      Textual Conventions
   --

   L2tpMilliSeconds ::=  TEXTUAL-CONVENTION
           DISPLAY-HINT    "d-3"
           STATUS          current
           DESCRIPTION
              "A period of time measured in units of .001 of seconds
               when used in conjunction with the DISPLAY-HINT will
               show seconds and fractions of second with a resolution
               of .001 of a second."
           SYNTAX          Integer32 (0..2147483646)

   --
   --      Definitions of significant branches
   --



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   l2tpNotifications   OBJECT IDENTIFIER  ::= { l2tp 0 }
   l2tpObjects         OBJECT IDENTIFIER  ::= { l2tp 1 }
   l2tpTransports      OBJECT IDENTIFIER  ::= { l2tp 3 }
   l2tpConformance     OBJECT IDENTIFIER  ::= { l2tp 4 }

   --
   --      Definitions of significant branches under l2tpObjects
   --
   l2tpScalar          OBJECT IDENTIFIER  ::= { l2tpObjects 1 }
   l2tpConfig          OBJECT IDENTIFIER  ::= { l2tpScalar 1 }
   l2tpStats           OBJECT IDENTIFIER  ::= { l2tpScalar 2 }

   --
   --      Definitions of significant branches under l2tpTransports
   --
   --      Note that future transports of L2TP (e.g.: Frame relay)
   --      should create their own branch under l2tpTransports.

   l2tpTransportIpUdp  OBJECT IDENTIFIER  ::= { l2tpTransports 1 }
   l2tpIpUdpObjects    OBJECT IDENTIFIER  ::= { l2tpTransportIpUdp 1 }
   l2tpIpUdpTraps      OBJECT IDENTIFIER  ::= { l2tpTransportIpUdp 2 }

   --
   --      The L2TP Scalar Configuration Group
   --
   --      This group of objects is used to manage configuration
   --      of the L2TP protocol environment.

   l2tpAdminState          OBJECT-TYPE
           SYNTAX          INTEGER {
                               enabled(1),
                               disabled(2)
                           }
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "This object defines the administrative state of
               the L2TP protocol. Setting this object to
               'disabled' causes all tunnels to be immediately
               disconnected and no further tunnels to be either
               initiated or accepted. The value of this object
               must be maintained in non-volatile memory."
           ::= { l2tpConfig 1 }

   l2tpDrainTunnels        OBJECT-TYPE
           SYNTAX          TruthValue
           MAX-ACCESS      read-write
           STATUS          current



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           DESCRIPTION
              "Setting this object to 'true' will prevent any new
               tunnels and/or sessions to be either initiated or
               accepted but does NOT disconnect any active
               tunnels/sessions. Setting this object to true(1)
               causes all domains and their respective tunnels
               to transition to the draining state. Note that
               when this occurs the 'xxxDraining' status objects
               of the domains and their tunnels should reflect
               that they are 'draining'. Setting this object has
               no affect on the domains or their tunnels
               'xxxDrainTunnels' configuration objects. To cancel
               a drain this object should be set to false(2).
               The object l2tpDrainingTunnels reflects
               the current L2TP draining state. The value of
               this object must be maintained in non-volatile
               memory."
           ::= { l2tpConfig 2 }

   --
   --      The L2TP Scalar Status and Statistics Group
   --
   --      This group of objects describe the current state and
   --      statistics of L2TP.

   l2tpProtocolVersions    OBJECT-TYPE
           SYNTAX          OCTET STRING (SIZE(2..256))
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
               "Vector of supported L2TP protocol version and
                revision numbers. Supported versions are identified
                via a two octet pairing where the first octet indicates
                the version and the second octet contains the revision."
           ::= { l2tpStats 1 }

   l2tpVendorName          OBJECT-TYPE
           SYNTAX          SnmpAdminString
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object identifies the Vendor name of the L2TP
               protocol stack."
           ::= { l2tpStats 2 }

   l2tpFirmwareRev         OBJECT-TYPE
           SYNTAX          Integer32
           MAX-ACCESS      read-only



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           STATUS          current
           DESCRIPTION
              "This object defines the firmware revision for the
               L2TP protocol stack."
           ::= { l2tpStats 3 }

   l2tpDrainingTunnels     OBJECT-TYPE
           SYNTAX          TruthValue
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object indicates if the local L2TP is draining
               off sessions from all tunnels."
           ::= { l2tpStats 4 }

   --
   --      The L2TP Domain Configuration Table
   --

   l2tpDomainConfigTable   OBJECT-TYPE
           SYNTAX          SEQUENCE OF L2tpDomainConfigEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "The L2TP Domain configuration table. This table
               contains objects that can be used to configure
               the operational characteristics of a tunnel
               domain. There is a 1-1 correspondence between
               conceptual rows of this table and conceptual
               rows of the l2tpDomainStatsTable."
           ::= { l2tpObjects 2 }

   l2tpDomainConfigEntry   OBJECT-TYPE
           SYNTAX          L2tpDomainConfigEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "An L2TP Domain configuration entry. An entry in this
               table may correspond to a single endpoint or a group
               of tunnel endpoints."
           INDEX { l2tpDomainConfigId }
           ::= { l2tpDomainConfigTable 1 }

   L2tpDomainConfigEntry ::=
           SEQUENCE {
               l2tpDomainConfigId
                   SnmpAdminString,
               l2tpDomainConfigAdminState



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                   INTEGER,
               l2tpDomainConfigDrainTunnels
                   TruthValue,
               l2tpDomainConfigAuth
                   INTEGER,
               l2tpDomainConfigSecret
                   SnmpAdminString,
               l2tpDomainConfigTunnelSecurity
                   INTEGER,
               l2tpDomainConfigTunnelHelloInt
                   Integer32,
               l2tpDomainConfigTunnelIdleTO
                   Integer32,
               l2tpDomainConfigControlRWS
                   Integer32,
               l2tpDomainConfigControlMaxRetx
                   Integer32,
               l2tpDomainConfigControlMaxRetxTO
                   Integer32,
               l2tpDomainConfigPayloadSeq
                   INTEGER,
               l2tpDomainConfigReassemblyTO
                   L2tpMilliSeconds,
               l2tpDomainConfigProxyPPPAuth
                   TruthValue,
               l2tpDomainConfigStorageType
                   StorageType,
               l2tpDomainConfigStatus
                   RowStatus
           }

   l2tpDomainConfigId OBJECT-TYPE
           SYNTAX          SnmpAdminString (SIZE (1..80))
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "The identifier, usually in the form of a Domain
               Name (full or partial), describing a single tunnel
               endpoint or a domain of tunnel endpoints. This is
               typically used as a 'handle' to identify the
               tunnel configuration requirements for both incoming
               and outgoing tunnel connection attempts. Both the
               LAC and  LNS could use information provided in the
               Host Name AVP attribute however the tunnel initiator
               could use other means not specified to identify
               the domain's tunnel configuration requirements.
               For example; three rows in this table have
               l2tpDomainConfigId values of 'lac1.isp.com',



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               'isp.com' and 'com'. A tunnel endpoint then identifies
               itself as 'lac1.isp.com' which would match the
               'lac1.isp.com' entry in this table. A second tunnel
               endpoint then identifies itself as 'lac2.isp.com'.
               This endpoint is then associated with the 'isp.com'
               entry of this table."
           ::= { l2tpDomainConfigEntry 1 }

   l2tpDomainConfigAdminState OBJECT-TYPE
           SYNTAX          INTEGER {
                               enabled(1),
                               disabled(2)
                           }
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object defines the administrative state of this
               tunnel domain. Setting this object to disabled(2)
               causes all tunnels to be immediately disconnected
               and no further tunnels to be either initiated or
               accepted. Note that all columnar objects corresponding
               to this conceptual row cannot be modified when
               the administrative state is enabled EXCEPT those
               objects which specifically state otherwise."
           DEFVAL { enabled }
           ::= { l2tpDomainConfigEntry 2 }

   l2tpDomainConfigDrainTunnels OBJECT-TYPE
           SYNTAX          TruthValue
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "Setting this object to 'true' will prevent any new
               tunnels and/or sessions from being either initiated
               or accepted but does NOT disconnect any active
               tunnels/sessions for this tunnel domain. Setting
               this object to true(1) causes all tunnels within
               this domain to transition to the draining state.
               Note that when this occurs the
               l2tpTunnelStatsDrainingTunnel status objects of
               all of this domain's tunnels should reflect that
               they are 'draining'. Setting this object has no
               effect on this domain's associated tunnels
               l2tpTunnelConfigDrainTunnel configuration objects.
               To cancel a drain this object should be set to
               false(2).  Setting this object to false(2) when
               the L2TP object l2tpDrainTunnels is true(1) has
               no affect, all domains and their tunnels will



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               continue to drain."
           DEFVAL { false }
           ::= { l2tpDomainConfigEntry 3 }

   l2tpDomainConfigAuth OBJECT-TYPE
           SYNTAX          INTEGER {
                               none(1),
                               simple(2),
                               challenge(3)
                           }
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object describes how tunnel peers belonging
               to this domain are to be authenticated. The value
               simple(2) indicates that peers are authenticated
               simply by their host name as described in the Host
               Name AVP.  The value challenge(3) indicates that
               all peers are challenged to prove their identification.
               This mechanism is described in the L2TP protocol."
           REFERENCE "RFC 2661 Section 5.1"
           DEFVAL { none }
           ::= { l2tpDomainConfigEntry 4 }

   l2tpDomainConfigSecret  OBJECT-TYPE
           SYNTAX          SnmpAdminString (SIZE (0..255))
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object is used to configure the shared secret
               used during the tunnel authentication phase of
               tunnel establishment. This object MUST be accessible
               only via requests using both authentication and
               privacy. The agent MUST report an empty string in
               response to get, get-next and get-bulk requests."
           ::= { l2tpDomainConfigEntry 5 }

   l2tpDomainConfigTunnelSecurity OBJECT-TYPE
           SYNTAX          INTEGER {
                               none(1),
                               other(2),
                               ipSec(3)
                           }
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object defines whether this tunnel domain
               requires that all tunnels are to be secured. The



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               value of ipsec(3) indicates that all tunnel packets,
               control and session, have IP Security headers. The
               type of IP Security headers (AH, ESP etc) and how
               they are further described is outside the scope of
               this document."
           DEFVAL { none }
           ::= { l2tpDomainConfigEntry 6 }

   l2tpDomainConfigTunnelHelloInt OBJECT-TYPE
           SYNTAX          Integer32 (0..3600)
           UNITS           "seconds"
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object defines the interval in which Hello
               (or keep-alive) packets are to be sent by local
               peers belonging to this tunnel domain. The value
               zero effectively disables the sending of Hello
               packets. This object may be modified when the
               administrative state is enabled for this conceptual
               row."
           DEFVAL { 60 }
           ::= { l2tpDomainConfigEntry 7 }

   l2tpDomainConfigTunnelIdleTO OBJECT-TYPE
           SYNTAX          Integer32 (-1..86400)
           UNITS           "seconds"
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object defines the period of time that an
               established tunnel belonging to this tunnel
               domain with no active sessions will wait before
               disconnecting the tunnel. A value of zero indicates
               that the tunnel will disconnect immediately after the
               last session disconnects. A value of -1 leaves the
               tunnel up indefinitely. This object may be modified
               when the administrative state is enabled for this
               conceptual row."
           DEFVAL { 0 }
           ::= { l2tpDomainConfigEntry 8 }

   l2tpDomainConfigControlRWS OBJECT-TYPE
           SYNTAX          Integer32 (1..65535)
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object defines the control channel receive



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               window size for tunnels belonging to this domain. It
               specifies the maximum number of packets the tunnel
               peer belonging to this domain can send without waiting
               for an acknowledgement from this peer."
           DEFVAL { 4 }
           ::= { l2tpDomainConfigEntry 9 }

   l2tpDomainConfigControlMaxRetx OBJECT-TYPE
           SYNTAX          Integer32 (0..32)
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object defines the maximum number of retransmissions
               which the L2TP stack will attempt for tunnels belonging
               to this domain before assuming that the peer is no
               longer responding."
           DEFVAL { 5 }
           ::= { l2tpDomainConfigEntry 10 }

   l2tpDomainConfigControlMaxRetxTO OBJECT-TYPE
           SYNTAX          Integer32 (1..32)
           UNITS           "seconds"
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object defines the maximum retransmission timeout
               interval which the L2TP stack will wait for tunnels
               belonging to this domain before retransmitting a
               control packet that has not been acknowledged."
           DEFVAL { 16 }
           ::= { l2tpDomainConfigEntry 11 }

   l2tpDomainConfigPayloadSeq OBJECT-TYPE
           SYNTAX          INTEGER {
                               onDemand(1),
                               never(2),
                               always(3)
                           }
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object determines whether or not session payload
               packets will be requested to be sent with sequence
               numbers from tunnel peers belonging to this domain.
               The value onDemand(1) allows the L2TP implementation
               to initiate payload sequencing when necessary based
               on local information (e.g: during LCP/NCP negotiations
               or for CCP). The value never(2) indicates that L2TP



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               will never initiate sequencing but will do sequencing
               if asked. The value always(3) indicates that L2TP
               will send the Sequencing Required AVP during session
               establishment."
           DEFVAL { onDemand }
           ::= { l2tpDomainConfigEntry 12 }

   l2tpDomainConfigReassemblyTO OBJECT-TYPE
           SYNTAX          L2tpMilliSeconds
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object defines the number of milliseconds that
               local peers of this tunnel domain will wait before
               processing payload packets that were received out of
               sequence (which are waiting for the packet(s) to put
               them in sequence).  A low value increases the chance
               of delayed packets to be discarded (which MAY cause
               the PPP decompression engine to reset) while a high
               value may cause more queuing and possibly degrade
               throughput if packets are truly lost. The default
               value for this object is zero which will result in
               all delayed packets being lost."
           DEFVAL { 0 }
           ::= { l2tpDomainConfigEntry 13 }

   l2tpDomainConfigProxyPPPAuth OBJECT-TYPE
           SYNTAX          TruthValue
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object is used to configure the sending
               or acceptance of the PPP Proxy Authentication
               AVP's on the LAC or LNS."
           DEFVAL { true }
           ::= { l2tpDomainConfigEntry 14 }

   l2tpDomainConfigStorageType  OBJECT-TYPE
           SYNTAX          StorageType
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "The storage type for this conceptual row.

               Conceptual rows having the value 'permanent' must
               allow write-access at a minimum to:

               - l2tpDomainConfigAdminState and



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                 l2tpDomainConfigDrainTunnels at all times
               - l2tpDomainConfigSecret if l2tpDomainConfigAuth
                 has been configured as 'challenge'

               It is an implementation issue to decide if a SET for
               a readOnly or permanent row is accepted at all. In some
               contexts this may make sense, in others it may not. If
               a SET for a readOnly or permanent row is not accepted
               at all, then a 'wrongValue' error must be returned."
           ::= { l2tpDomainConfigEntry 15 }

   l2tpDomainConfigStatus  OBJECT-TYPE
           SYNTAX          RowStatus
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "The status of this Domain entry. Columnar objects
               corresponding to this conceptual row may be modified
               according to their description clauses when this
               RowStatus object is 'active'."
           ::= { l2tpDomainConfigEntry 16 }

   --
   --      The L2TP Domain Status and Statistics Table
   --

   l2tpDomainStatsTable    OBJECT-TYPE
           SYNTAX          SEQUENCE OF L2tpDomainStatsEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "The L2TP Domain Status and Statistics table. This
               table contains objects that can be used to describe
               the current status and statistics of a tunnel domain.
               There is a 1-1 correspondence between conceptual
               rows of this table and conceptual rows of the
               l2tpDomainConfigTable."
           ::= { l2tpObjects 3 }

   l2tpDomainStatsEntry    OBJECT-TYPE
           SYNTAX          L2tpDomainStatsEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "An L2TP Domain Stats entry. An entry in this table
               may correspond to a single endpoint or a group of
               tunnel endpoints."
           AUGMENTS { l2tpDomainConfigEntry }



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           ::= { l2tpDomainStatsTable 1 }

   L2tpDomainStatsEntry ::=
           SEQUENCE {
               l2tpDomainStatsTotalTunnels
                   Counter32,
               l2tpDomainStatsFailedTunnels
                   Counter32,
               l2tpDomainStatsFailedAuths
                   Counter32,
               l2tpDomainStatsActiveTunnels
                   Gauge32,
               l2tpDomainStatsTotalSessions
                   Counter32,
               l2tpDomainStatsFailedSessions
                   Counter32,
               l2tpDomainStatsActiveSessions
                   Gauge32,
               l2tpDomainStatsDrainingTunnels
                   TruthValue,
               l2tpDomainStatsControlRxOctets
                   Counter32,
               l2tpDomainStatsControlRxPkts
                   Counter32,
               l2tpDomainStatsControlTxOctets
                   Counter32,
               l2tpDomainStatsControlTxPkts
                   Counter32,
               l2tpDomainStatsPayloadRxOctets
                   Counter32,
               l2tpDomainStatsPayloadRxPkts
                   Counter32,
               l2tpDomainStatsPayloadRxDiscs
                   Counter32,
               l2tpDomainStatsPayloadTxOctets
                   Counter32,
               l2tpDomainStatsPayloadTxPkts
                   Counter32,
               l2tpDomainStatsControlHCRxOctets
                   Counter64,
               l2tpDomainStatsControlHCRxPkts
                   Counter64,
               l2tpDomainStatsControlHCTxOctets
                   Counter64,
               l2tpDomainStatsControlHCTxPkts
                   Counter64,
               l2tpDomainStatsPayloadHCRxOctets
                   Counter64,



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               l2tpDomainStatsPayloadHCRxPkts
                   Counter64,
               l2tpDomainStatsPayloadHCRxDiscs
                   Counter64,
               l2tpDomainStatsPayloadHCTxOctets
                   Counter64,
               l2tpDomainStatsPayloadHCTxPkts
                   Counter64
           }

   l2tpDomainStatsTotalTunnels OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the total number of tunnels
               that have successfully reached the established
               state for this tunnel domain."
           ::= { l2tpDomainStatsEntry 1 }

   l2tpDomainStatsFailedTunnels OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of tunnels that
               failed (eg: connection timeout, unsupported
               or malformed AVP's etc) to reach the established
               state for this tunnel domain."
           ::= { l2tpDomainStatsEntry 2 }

   l2tpDomainStatsFailedAuths OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of failed tunnel
               connection attempts for this domain because the
               tunnel peer failed authentication."
           ::= { l2tpDomainStatsEntry 3 }

   l2tpDomainStatsActiveTunnels OBJECT-TYPE
           SYNTAX          Gauge32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of tunnels that
               are currently active for this domain."



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           ::= { l2tpDomainStatsEntry 4 }

   l2tpDomainStatsTotalSessions OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the total number of sessions
               that have successfully reached the established
               state for this tunnel domain."
           ::= { l2tpDomainStatsEntry 5 }

   l2tpDomainStatsFailedSessions OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of sessions that
               failed (eg: connection timeout, unsupported
               or malformed AVP's etc) to reach the established
               state for this tunnel domain."
           ::= { l2tpDomainStatsEntry 6 }

   l2tpDomainStatsActiveSessions OBJECT-TYPE
           SYNTAX          Gauge32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of sessions that
               are currently active for this domain."
           ::= { l2tpDomainStatsEntry 7 }

   l2tpDomainStatsDrainingTunnels OBJECT-TYPE
           SYNTAX          TruthValue
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object indicates if this domain is draining
               off sessions from all tunnels."
           ::= { l2tpDomainStatsEntry 8 }

   l2tpDomainStatsControlRxOctets OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of control channel
               octets received for this tunnel domain."



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           ::= { l2tpDomainStatsEntry 9 }

   l2tpDomainStatsControlRxPkts OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of control packets
               received for this tunnel domain."
           ::= { l2tpDomainStatsEntry 10 }

   l2tpDomainStatsControlTxOctets OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of control channel
               octets that were transmitted to tunnel endpoints
               for this domain."
           ::= { l2tpDomainStatsEntry 11 }

   l2tpDomainStatsControlTxPkts OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of control packets
               that were transmitted to tunnel endpoints for
               this domain."
           ::= { l2tpDomainStatsEntry 12 }

   l2tpDomainStatsPayloadRxOctets OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of payload channel
               octets that were received for this tunnel domain."
           ::= { l2tpDomainStatsEntry 13 }

   l2tpDomainStatsPayloadRxPkts OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of payload packets
               that were received for this tunnel domain."
           ::= { l2tpDomainStatsEntry 14 }



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   l2tpDomainStatsPayloadRxDiscs OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of received payload
               packets that were discarded by this tunnel domain."
           ::= { l2tpDomainStatsEntry 15 }

   l2tpDomainStatsPayloadTxOctets OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of payload channel
               octets that were transmitted to tunnel peers
               within this tunnel domain."
           ::= { l2tpDomainStatsEntry 16 }

   l2tpDomainStatsPayloadTxPkts OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of payload packets
               that were transmitted to tunnel peers within
               this tunnel domain."
           ::= { l2tpDomainStatsEntry 17 }

   --
   -- High Capacity Counter objects.  These objects are all
   -- 64 bit versions of the above 32-bit counters.  These
   -- objects all have the same basic semantics as their
   -- 32-bit counterparts, however, their syntax has been
   -- extended to 64 bits.
   --

   l2tpDomainStatsControlHCRxOctets OBJECT-TYPE
           SYNTAX          Counter64
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object is a 64-bit version of
               l2tpDomainStatsControlRxOctets."
           ::= { l2tpDomainStatsEntry 18 }

   l2tpDomainStatsControlHCRxPkts OBJECT-TYPE
           SYNTAX          Counter64



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           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object is a 64-bit version of
               l2tpDomainStatsControlRxPkts."
           ::= { l2tpDomainStatsEntry 19 }

   l2tpDomainStatsControlHCTxOctets OBJECT-TYPE
           SYNTAX          Counter64
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object is a 64-bit version of
               l2tpDomainStatsControlTxOctets."
           ::= { l2tpDomainStatsEntry 20 }

   l2tpDomainStatsControlHCTxPkts OBJECT-TYPE
           SYNTAX          Counter64
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object is a 64-bit version of
               l2tpDomainStatsControlTxPkts."
           ::= { l2tpDomainStatsEntry 21 }

   l2tpDomainStatsPayloadHCRxOctets OBJECT-TYPE
           SYNTAX          Counter64
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object is a 64-bit version of
               l2tpDomainStatsPayloadRxOctets."
           ::= { l2tpDomainStatsEntry 22 }

   l2tpDomainStatsPayloadHCRxPkts OBJECT-TYPE
           SYNTAX          Counter64
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object is a 64-bit version of
               l2tpDomainStatsPayloadRxPkts."
           ::= { l2tpDomainStatsEntry 23 }

   l2tpDomainStatsPayloadHCRxDiscs OBJECT-TYPE
           SYNTAX          Counter64
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION



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              "This object is a 64-bit version of
               l2tpDomainStatsPayloadRxDiscs."
           ::= { l2tpDomainStatsEntry 24 }

   l2tpDomainStatsPayloadHCTxOctets OBJECT-TYPE
           SYNTAX          Counter64
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object is a 64-bit version of
               l2tpDomainStatsPayloadTxOctets."
           ::= { l2tpDomainStatsEntry 25 }

   l2tpDomainStatsPayloadHCTxPkts OBJECT-TYPE
           SYNTAX          Counter64
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object is a 64-bit version of
               l2tpDomainStatsPayloadTxPkts."
           ::= { l2tpDomainStatsEntry 26 }

   --
   --      The L2TP Tunnel Configuration Table
   --

   l2tpTunnelConfigTable   OBJECT-TYPE
           SYNTAX          SEQUENCE OF L2tpTunnelConfigEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "The L2TP tunnel configuration table. This
               table contains objects that can be used to
               (re)configure the operational characteristics
               of a single L2TP tunnel. There is a 1-1
               correspondence between conceptual rows of
               this table and conceptual rows of the
               l2tpTunnelStatsTable. Entries in this table
               have the same persistency characteristics as
               that of the tunnelConfigTable."
           REFERENCE "RFC 2667"
           ::= { l2tpObjects 4 }

   l2tpTunnelConfigEntry   OBJECT-TYPE
           SYNTAX          L2tpTunnelConfigEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION



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              "A L2TP tunnel interface configuration entry.
               Entries in this table come and go as a result
               of protocol interactions or on management
               operations. The latter occurs when a row is
               instantiated in the tunnelConfigTable row
               and the encapsulation method is 'l2tp'."
           REFERENCE "RFC 2667"
           INDEX { l2tpTunnelConfigIfIndex }
           ::= { l2tpTunnelConfigTable 1 }

   L2tpTunnelConfigEntry ::=
           SEQUENCE {
               l2tpTunnelConfigIfIndex
                   InterfaceIndex,
               l2tpTunnelConfigDomainId
                   SnmpAdminString,
               l2tpTunnelConfigAuth
                   INTEGER,
               l2tpTunnelConfigSecret
                   SnmpAdminString,
               l2tpTunnelConfigSecurity
                   INTEGER,
               l2tpTunnelConfigHelloInterval
                   Integer32,
               l2tpTunnelConfigIdleTimeout
                   Integer32,
               l2tpTunnelConfigControlRWS
                   Integer32,
               l2tpTunnelConfigControlMaxRetx
                   Integer32,
               l2tpTunnelConfigControlMaxRetxTO
                   Integer32,
               l2tpTunnelConfigPayloadSeq
                   INTEGER,
               l2tpTunnelConfigReassemblyTO
                   L2tpMilliSeconds,
               l2tpTunnelConfigTransport
                   INTEGER,
               l2tpTunnelConfigDrainTunnel
                   TruthValue,
               l2tpTunnelConfigProxyPPPAuth
                   TruthValue
           }

   l2tpTunnelConfigIfIndex OBJECT-TYPE
           SYNTAX          InterfaceIndex
           MAX-ACCESS      not-accessible
           STATUS          current



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           DESCRIPTION
              "This value for this object is equal to the value
               of ifIndex of the Interfaces MIB for tunnel
               interfaces of type L2TP."
           ::= { l2tpTunnelConfigEntry 1 }

   l2tpTunnelConfigDomainId OBJECT-TYPE
           SYNTAX          SnmpAdminString (SIZE (1..80))
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "The tunnel domain that this tunnel belongs
               to. A LNS tunnel endpoint will typically inherit
               this value from the endpoint domain table. A
               LAC may be provided with this information during
               tunnel setup. When a zero length string is returned
               this tunnel does not belong belong to any particular
               domain."
           ::= { l2tpTunnelConfigEntry 2 }

   l2tpTunnelConfigAuth OBJECT-TYPE
           SYNTAX          INTEGER {
                               none(1),
                               simple(2),
                               challenge(3)
                           }
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "This object describes how L2TP tunnel peers are
               to be authenticated. The value 'simple' indicates
               that peers are authenticated simply by their host
               name as described in the Host Name AVP. The value
               'challenge' indicates that all peers are challenged
               to prove their identification. This mechanism is
               described in the L2TP protocol. This object cannot
               be modified when the tunnel is in a connecting or
               connected state."
           DEFVAL { none }
           ::= { l2tpTunnelConfigEntry 3 }

   l2tpTunnelConfigSecret  OBJECT-TYPE
           SYNTAX          SnmpAdminString (SIZE (0..255))
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "This object is used to configure the shared secret
               used during the tunnel authentication phase of



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               tunnel establishment. This object cannot be modified
               when the tunnel is in a connecting or connected
               state. This object MUST be accessible only via
               requests using both authentication and privacy.
               The agent MUST report an empty string in response
               to get, get-next and get-bulk requests."
           ::= { l2tpTunnelConfigEntry 4 }

   l2tpTunnelConfigSecurity OBJECT-TYPE
           SYNTAX          INTEGER {
                               none(1),
                               other(2),
                               ipsec(3)
                           }
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "This object defines whether this tunnel is to be
               secured. The value of 'ipSec' indicates that all
               tunnel packets, control and session, have IP
               Security headers. The type of IP Security headers
               (AH, ESP etc) and how they are further described
               is outside the scope of this document. This object
               cannot be modified when the tunnel is in a connecting
               or connected state."
           DEFVAL { none }
           ::= { l2tpTunnelConfigEntry 5 }

   l2tpTunnelConfigHelloInterval OBJECT-TYPE
           SYNTAX          Integer32  (0..3600)
           UNITS           "seconds"
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "This object defines the interval in which Hello
               (or keep-alive) packets are to be sent to the
               tunnel peer.  The value zero effectively disables
               the sending of Hello packets. Modifications to this
               object have immediate effect."
           DEFVAL { 60 }
           ::= { l2tpTunnelConfigEntry 6 }

   l2tpTunnelConfigIdleTimeout OBJECT-TYPE
           SYNTAX          Integer32 (-1..86400)
           UNITS           "seconds"
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION



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              "This object defines the period of time that an
               established tunnel with no sessions will wait
               before disconnecting the tunnel. A value of
               zero indicates that the tunnel will disconnect
               immediately after the last session disconnects.
               A value of -1 leaves the tunnel up indefinitely.
               Modifications to this object have immediate
               effect."
           DEFVAL { 0 }
           ::= { l2tpTunnelConfigEntry 7 }

   l2tpTunnelConfigControlRWS OBJECT-TYPE
           SYNTAX          Integer32 (1..65535)
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "This object defines the control channel receive
               window size. It specifies the maximum number of
               packets the tunnel peer can send without waiting
               for an acknowledgement from this peer. This object
               cannot be modified when the tunnel is in a con-
               necting or connected state."
           DEFVAL { 4 }
           ::= { l2tpTunnelConfigEntry 8 }

   l2tpTunnelConfigControlMaxRetx OBJECT-TYPE
           SYNTAX          Integer32 (0..32)
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "This object defines the number of retransmissions
               which the tunnel will attempt before assuming that
               the peer is no longer responding. A value of zero
               indicates that this peer will not attempt to
               retransmit an unacknowledged control packet.
               Modifications to this object have immediate
               effect."
           DEFVAL { 5 }
           ::= { l2tpTunnelConfigEntry 9 }

   l2tpTunnelConfigControlMaxRetxTO OBJECT-TYPE
           SYNTAX          Integer32 (1..32)
           UNITS           "seconds"
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "This object defines the maximum retransmission timeout
               interval which the tunnel will wait before retrans-



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               mitting a control packet that has not been acknowledged.
               Modifications to this object have immediate effect."
           DEFVAL { 16 }
           ::= { l2tpTunnelConfigEntry 10 }

   l2tpTunnelConfigPayloadSeq OBJECT-TYPE
           SYNTAX          INTEGER {
                               onDemand(1),
                               never(2),
                               always(3)
                           }
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "This object determines whether or not session payload
               packets will be requested to be sent with sequence
               numbers from tunnel peers belonging to this domain.
               The value onDemand(1) allows the L2TP implementation
               to initiate payload sequencing when necessary based
               on local information (e.g: during LCP/NCP negotiations
               or for CCP). The value never(2) indicates that L2TP
               will never initiate sequencing but will do sequencing
               if asked. The value always(3) indicates that L2TP
               will send the Sequencing Required AVP during session
               establishment. Modifications to this object have
               immediate effect."
           DEFVAL { onDemand }
           ::= { l2tpTunnelConfigEntry 11 }

   l2tpTunnelConfigReassemblyTO OBJECT-TYPE
           SYNTAX          L2tpMilliSeconds
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "This object defines the number of milliseconds that
               this tunnel will wait before processing payload packets
               that were received out of sequence (which are waiting
               for the packet(s) to put them in sequence).  A low value
               increases the chance of delayed packets to be discarded
               (which MAY cause the PPP decompression engine to
               reset) while a high value may cause more queuing and
               possibly degrade throughput if packets are truly lost.
               The default value for this object is zero which will
               result in all delayed packets being lost. Modifications
               to this object have immediate effect."
           DEFVAL { 0 }
           ::= { l2tpTunnelConfigEntry 12 }




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   l2tpTunnelConfigTransport OBJECT-TYPE
           SYNTAX          INTEGER {
                              other(1),
                              none(2),
                              udpIp(3),
                              frameRelay(4),
                              atm(5)
                           }
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "This object defines the underlying transport media
               that is in use for this tunnel entry. Different tunnel
               transports may define MIB extensions to the L2TP tunnel
               table to realize the transport layer. For example if the
               value of this object is 'udpIp' then the value of ifIndex
               for this table may be used to determine state from the
               l2tpUdpStatsTable. This object cannot be modified when
               the tunnel is in a connecting or connected state."
           ::= { l2tpTunnelConfigEntry 13 }

   l2tpTunnelConfigDrainTunnel OBJECT-TYPE
           SYNTAX          TruthValue
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "Setting this object to 'true' will prevent any new
               session from being either initiated or accepted but
               does NOT disconnect any active sessions for this
               tunnel. Note that when this occurs the
               l2tpTunnelStatsDrainingTunnel status object of
               this tunnel should reflect that it is 'draining'.
               To cancel a drain this object should be set to
               false(2).  Setting this object to false(2) when
               the L2TP objects l2tpDrainTunnels or
               l2tpDomainConfigDrainTunnels is true(1) has
               no affect, this tunnels will continue to drain."
           DEFVAL { false }
           ::= { l2tpTunnelConfigEntry 14 }

   l2tpTunnelConfigProxyPPPAuth OBJECT-TYPE
           SYNTAX          TruthValue
           MAX-ACCESS      read-write
           STATUS          current
           DESCRIPTION
              "This object is used to configure the sending
               or acceptance of the session PPP Proxy
               Authentication AVP's on the LAC or LNS."



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           DEFVAL { true }
           ::= { l2tpTunnelConfigEntry 15 }

   --
   --      The L2TP Tunnel Status and Statisticss Table
   --


   l2tpTunnelStatsTable    OBJECT-TYPE
           SYNTAX          SEQUENCE OF L2tpTunnelStatsEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "The L2TP tunnel status and statistics table. This
               table contains objects that can be used to describe
               the current status and statistics of a single L2TP
               tunnel. There is a 1-1 correspondence between
               conceptual rows of this table and conceptual rows of
               the l2tpTunnelConfigTable."
           ::= { l2tpObjects 5 }

   l2tpTunnelStatsEntry    OBJECT-TYPE
           SYNTAX          L2tpTunnelStatsEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "An L2TP tunnel interface stats entry."
           AUGMENTS { l2tpTunnelConfigEntry }
           ::= { l2tpTunnelStatsTable 1 }

   L2tpTunnelStatsEntry ::=
           SEQUENCE {
               l2tpTunnelStatsLocalTID
                   Integer32,
               l2tpTunnelStatsRemoteTID
                   Integer32,
               l2tpTunnelStatsState
                   INTEGER,
               l2tpTunnelStatsInitiated
                   INTEGER,
               l2tpTunnelStatsRemoteHostName
                   SnmpAdminString,
               l2tpTunnelStatsRemoteVendorName
                   SnmpAdminString,
               l2tpTunnelStatsRemoteFirmwareRev
                   Integer32,
               l2tpTunnelStatsRemoteProtocolVer
                   OCTET STRING,



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               l2tpTunnelStatsInitialRemoteRWS
                   Integer32,
               l2tpTunnelStatsBearerCaps
                   INTEGER,
               l2tpTunnelStatsFramingCaps
                   INTEGER,
               l2tpTunnelStatsControlRxPkts
                   Counter32,
               l2tpTunnelStatsControlRxZLB
                   Counter32,
               l2tpTunnelStatsControlOutOfSeq
                   Counter32,
               l2tpTunnelStatsControlOutOfWin
                   Counter32,
               l2tpTunnelStatsControlTxPkts
                   Counter32,
               l2tpTunnelStatsControlTxZLB
                   Counter32,
               l2tpTunnelStatsControlAckTO
                   Counter32,
               l2tpTunnelStatsCurrentRemoteRWS
                   Gauge32,
               l2tpTunnelStatsTxSeq
                   Integer32,
               l2tpTunnelStatsTxSeqAck
                   Integer32,
               l2tpTunnelStatsRxSeq
                   Integer32,
               l2tpTunnelStatsRxSeqAck
                   Integer32,
               l2tpTunnelStatsTotalSessions
                   Counter32,
               l2tpTunnelStatsFailedSessions
                   Counter32,
               l2tpTunnelStatsActiveSessions
                   Gauge32,
               l2tpTunnelStatsLastResultCode
                   Integer32,
               l2tpTunnelStatsLastErrorCode
                   Integer32,
               l2tpTunnelStatsLastErrorMessage
                   SnmpAdminString,
               l2tpTunnelStatsDrainingTunnel
                   TruthValue
           }

   l2tpTunnelStatsLocalTID OBJECT-TYPE
           SYNTAX          Integer32 (0..65535)



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           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the local tunnel Identifier."
           REFERENCE "RFC 2661, Section 3.1"
           ::= { l2tpTunnelStatsEntry 1 }

   l2tpTunnelStatsRemoteTID OBJECT-TYPE
           SYNTAX          Integer32 (0..65535)
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the remote tunnel Identifier."
           REFERENCE "RFC 2661, Section 3.1"
           ::= { l2tpTunnelStatsEntry 2 }

   l2tpTunnelStatsState    OBJECT-TYPE
           SYNTAX          INTEGER {
                               tunnelIdle(1),
                               tunnelConnecting(2),
                               tunnelEstablished(3),
                               tunnelDisconnecting(4)
                           }
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This field contains the current state of the
               control tunnel."
           ::= { l2tpTunnelStatsEntry 3 }

   l2tpTunnelStatsInitiated OBJECT-TYPE
           SYNTAX          INTEGER {
                               locally(1),
                               remotely(2)
                           }
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object indicates whether the tunnel was
               initiated locally or by the remote tunnel peer."
           ::= { l2tpTunnelStatsEntry 4 }

   l2tpTunnelStatsRemoteHostName OBJECT-TYPE
           SYNTAX          SnmpAdminString
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the host name as discovered



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               during the tunnel establishment phase (via the Host
               Name AVP) of the L2TP peer. If the tunnel is idle
               this object should maintain its value from the last
               time it was connected."
           ::= { l2tpTunnelStatsEntry 5 }

   l2tpTunnelStatsRemoteVendorName OBJECT-TYPE
           SYNTAX          SnmpAdminString
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object identifies the vendor name of the peer's
               L2TP implementation. If the tunnel is idle this
               object should maintain its value from the last time
               it was connected."
           ::= { l2tpTunnelStatsEntry 6 }

   l2tpTunnelStatsRemoteFirmwareRev OBJECT-TYPE
           SYNTAX          Integer32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the tunnel peer's firmware
               revision number. If the tunnel is idle this object
               should maintain its value from the last time it
               was connected."
           ::= { l2tpTunnelStatsEntry 7 }

   l2tpTunnelStatsRemoteProtocolVer OBJECT-TYPE
           SYNTAX          OCTET STRING (SIZE(2))
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object describes the protocol version and
               revision of the tunnel peers implementation. The
               first octet contains the protocol version. The
               second octet contains the protocol revision."
           ::= { l2tpTunnelStatsEntry 8 }

   l2tpTunnelStatsInitialRemoteRWS OBJECT-TYPE
           SYNTAX          Integer32 (0..65535)
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the initial remote peer's
               receive window size as indicated by the tunnel peer
               (in the RWS AVP) during the tunnel establishment
               phase. If the tunnel is idle this object should



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               maintain its value from the last time it was
               connected."
           ::= { l2tpTunnelStatsEntry 9 }

   l2tpTunnelStatsBearerCaps OBJECT-TYPE
           SYNTAX          INTEGER {
                               none(1),
                               digital(2),
                               analog(3),
                               digitalAnalog(4)
                           }
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object describes the Bearer Capabilities of
               the tunnel peer. If the tunnel is idle this object
               should maintain its value from the last time it was
               connected."
           ::= { l2tpTunnelStatsEntry 10 }

   l2tpTunnelStatsFramingCaps OBJECT-TYPE
           SYNTAX          INTEGER {
                               none(1),
                               sync(2),
                               async(3),
                               syncAsync(4)
                           }
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object describes the Framing Capabilities of
               the tunnel peer. If the tunnel is idle this object
               should maintain its value from the last time it was
               connected."
           ::= { l2tpTunnelStatsEntry 11 }

   l2tpTunnelStatsControlRxPkts OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the number of control packets
               received on the tunnel."
           ::= { l2tpTunnelStatsEntry 12 }

   l2tpTunnelStatsControlRxZLB OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only



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           STATUS          current
           DESCRIPTION
              "This object returns a count of the number of Zero
               Length Body control packet acknowledgement packets
               that were received."
           ::= { l2tpTunnelStatsEntry 13 }

   l2tpTunnelStatsControlOutOfSeq OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns a count of the number of
               control packets that were not received in the
               correct order (as per the sequence number)
               on this tunnel including out of window
               packets."
           ::= { l2tpTunnelStatsEntry 14 }

   l2tpTunnelStatsControlOutOfWin OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the number of control
               packets that were received outside of the
               offered receive window. It is implementation
               specific as to whether these packets are queued
               or discarded."
           ::= { l2tpTunnelStatsEntry 15 }

   l2tpTunnelStatsControlTxPkts OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the number of control
               packets that were transmitted to the tunnel
               peer."
           ::= { l2tpTunnelStatsEntry 16 }

   l2tpTunnelStatsControlTxZLB OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the number of Zero Length
               Body control packets transmitted to the tunnel



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               peer."
           ::= { l2tpTunnelStatsEntry 17 }

   l2tpTunnelStatsControlAckTO OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns a count of the number of
               control packet timeouts due to the lack of a
               timely acknowledgement from the tunnel peer."
           ::= { l2tpTunnelStatsEntry 18 }

   l2tpTunnelStatsCurrentRemoteRWS OBJECT-TYPE
           SYNTAX          Gauge32 (0..65535)
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the current remote receive
               window size as determined by the local flow
               control mechanism employed."
           ::= { l2tpTunnelStatsEntry 19 }

   l2tpTunnelStatsTxSeq  OBJECT-TYPE
           SYNTAX          Integer32 (0..65535)
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the next send sequence number
               for the control channel."
           ::= { l2tpTunnelStatsEntry 20 }

   l2tpTunnelStatsTxSeqAck OBJECT-TYPE
           SYNTAX          Integer32 (0..65535)
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the send sequence number that
               the tunnel peer has acknowledged for the control
               channel. The flow control state can be determined
               by subtracting the l2tpTunnelStatsTxSeq from
               l2tpTunnelStatsTxSeqAck and comparing this value
               to l2tpTunnelStatsCurrentRemoteRWS (taking into
               consideration sequence number wraps)."
           ::= { l2tpTunnelStatsEntry 21 }

   l2tpTunnelStatsRxSeq  OBJECT-TYPE
           SYNTAX          Integer32 (0..65535)



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           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the next receive sequence
               number expected to be received on this control
               channel."
           ::= { l2tpTunnelStatsEntry 22 }

   l2tpTunnelStatsRxSeqAck OBJECT-TYPE
           SYNTAX          Integer32 (0..65535)
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the last receive sequence
               number that was acknowledged back to the tunnel
               peer for the control channel."
           ::= { l2tpTunnelStatsEntry 23 }

   l2tpTunnelStatsTotalSessions OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the total number of sessions
               that this tunnel has successfully connected through
               to its tunnel peer since this tunnel was created."
           ::= { l2tpTunnelStatsEntry 24 }

   l2tpTunnelStatsFailedSessions OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the total number of sessions
               that were initiated but failed to reach the
               established phase."
           ::= { l2tpTunnelStatsEntry 25 }

   l2tpTunnelStatsActiveSessions OBJECT-TYPE
           SYNTAX          Gauge32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the total number of sessions
               in the established state for this tunnel."
           ::= { l2tpTunnelStatsEntry 26 }

   l2tpTunnelStatsLastResultCode OBJECT-TYPE



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           SYNTAX          Integer32 (0..65535)
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the last value of the result
               code as described in the Result Code AVP which
               caused the tunnel to disconnect."
           ::= { l2tpTunnelStatsEntry 27 }

   l2tpTunnelStatsLastErrorCode OBJECT-TYPE
           SYNTAX          Integer32 (0..65535)
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the last value of the error
               code as described in the Result Code AVP which
               caused the tunnel to disconnect."
           ::= { l2tpTunnelStatsEntry 28 }

   l2tpTunnelStatsLastErrorMessage OBJECT-TYPE
           SYNTAX          SnmpAdminString
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the last value of the optional
               message as described in the Result Code AVP which
               caused the tunnel to disconnect."
           ::= { l2tpTunnelStatsEntry 29 }

   l2tpTunnelStatsDrainingTunnel OBJECT-TYPE
           SYNTAX          TruthValue
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object indicates if this tunnel is draining
               off sessions. This object will return false(2) when
               the tunnel is not draining sessions or after the
               last session has disconnected when the tunnel is in
               the draining state."
           ::= { l2tpTunnelStatsEntry 30 }

   --
   --      { l2tpObjects 6 } reserved for future use
   --

   --
   --      The L2TP Session Status and Statistics Table
   --



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   l2tpSessionStatsTable   OBJECT-TYPE
           SYNTAX          SEQUENCE OF L2tpSessionStatsEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "The L2TP session status and statistics table. This
               table contains the objects that can be used to
               describe the current status and statistics of a
               single L2TP tunneled session."
           ::= { l2tpObjects 7 }

   l2tpSessionStatsEntry   OBJECT-TYPE
           SYNTAX          L2tpSessionStatsEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "An L2TP session interface stats entry."
           INDEX { l2tpSessionStatsTunnelIfIndex,
                   l2tpSessionStatsLocalSID }
           ::= { l2tpSessionStatsTable 1 }

   L2tpSessionStatsEntry ::=
           SEQUENCE {
               l2tpSessionStatsTunnelIfIndex
                   InterfaceIndex,
               l2tpSessionStatsIfIndex
                   InterfaceIndex,
               l2tpSessionStatsLocalSID
                   Integer32,
               l2tpSessionStatsRemoteSID
                   Integer32,
               l2tpSessionStatsUserName
                   SnmpAdminString,
               l2tpSessionStatsState
                   INTEGER,
               l2tpSessionStatsCallType
                   INTEGER,
               l2tpSessionStatsCallSerialNumber
                   Unsigned32,
               l2tpSessionStatsTxConnectSpeed
                   Unsigned32,
               l2tpSessionStatsRxConnectSpeed
                   Unsigned32,
               l2tpSessionStatsCallBearerType
                   INTEGER,
               l2tpSessionStatsFramingType
                   INTEGER,
               l2tpSessionStatsPhysChanId



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                   Unsigned32,
               l2tpSessionStatsDNIS
                   SnmpAdminString,
               l2tpSessionStatsCLID
                   SnmpAdminString,
               l2tpSessionStatsSubAddress
                   SnmpAdminString,
               l2tpSessionStatsPrivateGroupID
                   SnmpAdminString,
               l2tpSessionStatsProxyLcp
                   TruthValue,
               l2tpSessionStatsAuthMethod
                   INTEGER,
               l2tpSessionStatsSequencingState
                   INTEGER,
               l2tpSessionStatsOutSequence
                   Counter32,
               l2tpSessionStatsReassemblyTO
                   Counter32,
               l2tpSessionStatsTxSeq
                   Integer32,
               l2tpSessionStatsRxSeq
                   Integer32
           }

   l2tpSessionStatsTunnelIfIndex OBJECT-TYPE
           SYNTAX          InterfaceIndex
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "This object identifies the session's associated
               L2TP tunnel ifIndex value."
           ::= { l2tpSessionStatsEntry 1 }

   l2tpSessionStatsIfIndex OBJECT-TYPE
           SYNTAX          InterfaceIndex
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object identifies the ifIndex value of the
               interface from which PPP packets are being tunneled.
               For example this could be a DS0 ifIndex on a
               LAC or it would be the PPP ifIndex on the LNS."
           ::= { l2tpSessionStatsEntry 2 }

   l2tpSessionStatsLocalSID OBJECT-TYPE
           SYNTAX          Integer32 (1..65535)
           MAX-ACCESS      not-accessible



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           STATUS          current
           DESCRIPTION
              "This object contains the local assigned session
               identifier for this session."
           REFERENCE "RFC 2661, Section 3.1"
           ::= { l2tpSessionStatsEntry 3 }

   l2tpSessionStatsRemoteSID OBJECT-TYPE
           SYNTAX          Integer32  (0..65535)
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the remote assigned session
               identifier for this session. When a session is
               starting this value may be zero until the remote
               tunnel endpoint has responded."
           REFERENCE "RFC 2661, Section 3.1"
           ::= { l2tpSessionStatsEntry 4 }

   l2tpSessionStatsUserName OBJECT-TYPE
           SYNTAX          SnmpAdminString
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object identifies the peer session name on
               this interface. This is typically the login name
               of the remote user. If the user name is unknown to
               the local tunnel peer then this object will contain
               a null string."
           ::= { l2tpSessionStatsEntry 5 }

   l2tpSessionStatsState   OBJECT-TYPE
           SYNTAX          INTEGER {
                               sessionIdle(1),
                               sessionConnecting(2),
                               sessionEstablished(3),
                               sessionDisconnecting(4)
                           }
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the current state of the
               session."
           ::= { l2tpSessionStatsEntry 6 }

   l2tpSessionStatsCallType OBJECT-TYPE
           SYNTAX          INTEGER {
                               lacIncoming(1),



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                               lnsIncoming(2),
                               lacOutgoing(3),
                               lnsOutgoing(4)
                           }
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object indicates the type of call and the
               role this tunnel peer is providing for this
               session. For example, lacIncoming(1) indicates
               that this tunnel peer is acting as a LAC and
               generated a Incoming-Call-Request to the tunnel
               peer (the LNS). Note that tunnel peers can be
               both LAC and LNS simultaneously."
           ::= { l2tpSessionStatsEntry 7 }

   l2tpSessionStatsCallSerialNumber OBJECT-TYPE
           SYNTAX          Unsigned32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the serial number that has
               been assigned to this  session."
           ::= { l2tpSessionStatsEntry 8 }

   l2tpSessionStatsTxConnectSpeed OBJECT-TYPE
           SYNTAX          Unsigned32
           UNITS           "bits per second"
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the last known transmit
               baud rate for this session."
           ::= { l2tpSessionStatsEntry 9 }

   l2tpSessionStatsRxConnectSpeed OBJECT-TYPE
           SYNTAX          Unsigned32
           UNITS           "bits per second"
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the last known receive
               baud rate for this session established."
           ::= { l2tpSessionStatsEntry 10 }

   l2tpSessionStatsCallBearerType OBJECT-TYPE
           SYNTAX          INTEGER {
                               none(1),



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                               digital(2),
                               analog(3)
                           }
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object describes the bearer type of this
               session."
           ::= { l2tpSessionStatsEntry 11 }

   l2tpSessionStatsFramingType OBJECT-TYPE
           SYNTAX          INTEGER {
                               none(1),
                               sync(2),
                               async(3)
                           }
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object describes the framing type of this
               session."
           ::= { l2tpSessionStatsEntry 12 }

   l2tpSessionStatsPhysChanId OBJECT-TYPE
           SYNTAX          Unsigned32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the physical channel
               identifier for the session."
           ::= { l2tpSessionStatsEntry 13 }

   l2tpSessionStatsDNIS    OBJECT-TYPE
           SYNTAX          SnmpAdminString
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object identifies the Dialed Number
               Information String that the LAC obtained from
               the network for the session. If no DNIS was
               provided then a null string will be returned."
           ::= { l2tpSessionStatsEntry 14 }

   l2tpSessionStatsCLID    OBJECT-TYPE
           SYNTAX          SnmpAdminString
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION



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              "This object identifies the Calling Line ID
               that the LAC obtained from the network for
               the session. If no CLID was provided then a
               null string will be returned."
           ::= { l2tpSessionStatsEntry 15 }

   l2tpSessionStatsSubAddress OBJECT-TYPE
           SYNTAX          SnmpAdminString
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object identifies the Sub Address that
               the LAC obtained from the network for the
               session. If no Sub Address was provided then
               a null string will be returned."
           ::= { l2tpSessionStatsEntry 16 }

   l2tpSessionStatsPrivateGroupID OBJECT-TYPE
           SYNTAX          SnmpAdminString
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object identifies the Private Group
               Identifier used for this tunneled session.
               If no Private Group Identifier was provided
               then a null string will be returned."
           ::= { l2tpSessionStatsEntry 17 }

   l2tpSessionStatsProxyLcp OBJECT-TYPE
           SYNTAX          TruthValue
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "Indicates whether the LAC performed proxy LCP
               for this session."
           ::= { l2tpSessionStatsEntry 18 }

   l2tpSessionStatsAuthMethod OBJECT-TYPE
           SYNTAX          INTEGER {
                               none(1),
                               text(2),
                               pppChap(3),
                               pppPap(4),
                               pppEap(5),
                               pppMsChapV1(6),
                               pppMsChapV2(7),
                               other(8)
                           }



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           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the proxy authentication
               method employed by the LAC for the session. If
               l2tpSessionProxyLcp is false(2) this object
               should not be interpreted."
           ::= { l2tpSessionStatsEntry 19 }

   l2tpSessionStatsSequencingState OBJECT-TYPE
           SYNTAX          INTEGER {
                               none(1),
                               remote(2),
                               local(3),
                               both(4)
                           }
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object defines which tunnel peers have
               requested payload sequencing. The value of
               both(4) indicates that both peers have requested
               payload sequencing."
           ::= { l2tpSessionStatsEntry 20 }

   l2tpSessionStatsOutSequence OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the total number of packets
               received for this session which were received out
               of sequence."
           ::= { l2tpSessionStatsEntry 21 }

   l2tpSessionStatsReassemblyTO OBJECT-TYPE
           SYNTAX          Counter32
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object returns the number of reassembly
               timeouts that have occurred for this session."
           ::= { l2tpSessionStatsEntry 22 }

   l2tpSessionStatsTxSeq OBJECT-TYPE
           SYNTAX          Integer32 (0..65535)
           MAX-ACCESS      read-only
           STATUS          current



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           DESCRIPTION
              "This object contains the next send sequence number
               for for this session."
           ::= { l2tpSessionStatsEntry 23 }

   l2tpSessionStatsRxSeq OBJECT-TYPE
           SYNTAX          Integer32 (0..65535)
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the next receive sequence
               number expected to be received on this session."
           ::= { l2tpSessionStatsEntry 24 }

   --
   --      The L2TP Tunnel Mapping Table
   --

   l2tpTunnelMapTable      OBJECT-TYPE
           SYNTAX          SEQUENCE OF L2tpTunnelMapEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "The L2TP Tunnel index mapping table. This table
               is intended to assist management applications
               to quickly determine what the ifIndex value is
               for a given local tunnel identifier."
           ::= { l2tpObjects 8 }

   l2tpTunnelMapEntry OBJECT-TYPE
           SYNTAX          L2tpTunnelMapEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "An L2TP tunnel index map entry."
           INDEX { l2tpTunnelMapLocalTID }
           ::= { l2tpTunnelMapTable 1 }

   L2tpTunnelMapEntry ::=
           SEQUENCE {
               l2tpTunnelMapLocalTID
                   Integer32,
               l2tpTunnelMapIfIndex
                   InterfaceIndex
           }

   l2tpTunnelMapLocalTID   OBJECT-TYPE
           SYNTAX          Integer32 (1..65535)



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           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "This object contains the local tunnel Identifier."
           REFERENCE "RFC 2661, Section 3.1"
           ::= { l2tpTunnelMapEntry 1 }

   l2tpTunnelMapIfIndex    OBJECT-TYPE
           SYNTAX          InterfaceIndex
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This value for this object is equal to the value
               of ifIndex of the Interfaces MIB for tunnel
               interfaces of type L2TP."
           ::= { l2tpTunnelMapEntry 2 }

   --
   --      The L2TP Session Mapping Table
   --

   l2tpSessionMapTable     OBJECT-TYPE
           SYNTAX          SEQUENCE OF L2tpSessionMapEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "The L2TP Session index mapping table. This table
               is intended to assist management applications
               to map interfaces to a tunnel and session
               identifier."
           ::= { l2tpObjects 9 }

   l2tpSessionMapEntry     OBJECT-TYPE
           SYNTAX          L2tpSessionMapEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "An L2TP Session index map entry."
           INDEX { l2tpSessionMapIfIndex }
           ::= { l2tpSessionMapTable 1 }

   L2tpSessionMapEntry ::=
           SEQUENCE {
               l2tpSessionMapIfIndex
                   InterfaceIndex,
               l2tpSessionMapTunnelIfIndex
                   InterfaceIndex,
               l2tpSessionMapLocalSID



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                   Integer32,
               l2tpSessionMapStatus
                   RowStatus
           }

   l2tpSessionMapIfIndex   OBJECT-TYPE
           SYNTAX          InterfaceIndex
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "This object identifies the ifIndex value of the
               interface which is receiving or sending its packets
               over an L2TP tunnel. For example this could be a DS0
               ifIndex on a LAC or a PPP ifIndex on the LNS."
           ::= { l2tpSessionMapEntry 1 }

   l2tpSessionMapTunnelIfIndex OBJECT-TYPE
           SYNTAX          InterfaceIndex
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "This object identifies the sessions associated
               L2TP tunnel ifIndex value. When this object is
               set it provides a binding between a particular
               interface identified by l2tpSessionMapIfIndex
               to a particular tunnel."
           ::= { l2tpSessionMapEntry 2 }

   l2tpSessionMapLocalSID  OBJECT-TYPE
           SYNTAX          Integer32 (1..65535)
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object contains the local assigned session
               identifier for this session."
           REFERENCE "RFC 2661, Section 3.1"
           ::= { l2tpSessionMapEntry 3 }

   l2tpSessionMapStatus    OBJECT-TYPE
           SYNTAX          RowStatus
           MAX-ACCESS      read-create
           STATUS          current
           DESCRIPTION
              "The status of this session map entry."
           ::= { l2tpSessionMapEntry 4 }

   --
   --      { l2tpIpUdpObjects 1 } reserved for future use



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   --
   --      The L2TP UDP/IP Transport Status and Statistics Table
   --

   l2tpUdpStatsTable       OBJECT-TYPE
           SYNTAX          SEQUENCE OF L2tpUdpStatsEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "The L2TP UDP/IP transport stats table. This table
               contains objects that can be used to describe the
               current status and statistics of the UDP/IP L2TP
               tunnel transport."
           ::= { l2tpIpUdpObjects 2 }

   l2tpUdpStatsEntry       OBJECT-TYPE
           SYNTAX          L2tpUdpStatsEntry
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "An L2TP UDP/IP transport stats entry."
           INDEX { l2tpUdpStatsIfIndex }
           ::= { l2tpUdpStatsTable 1 }

   L2tpUdpStatsEntry ::=
           SEQUENCE {
               l2tpUdpStatsIfIndex
                   InterfaceIndex,
               l2tpUdpStatsPeerPort
                   Integer32,
               l2tpUdpStatsLocalPort
                   Integer32
           }

   l2tpUdpStatsIfIndex     OBJECT-TYPE
           SYNTAX          InterfaceIndex
           MAX-ACCESS      not-accessible
           STATUS          current
           DESCRIPTION
              "This value for this object is equal to the
               value of ifIndex of the Interfaces MIB for
               tunnel interfaces of type L2TP and which have
               a L2TP transport of UDP/IP."
           ::= { l2tpUdpStatsEntry 1 }

   l2tpUdpStatsPeerPort    OBJECT-TYPE
           SYNTAX          Integer32 (0..65535)
           MAX-ACCESS      read-only



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           STATUS          current
           DESCRIPTION
              "This object reflects the peer's UDP port number
               used for this tunnel. When not known a value of
               zero should be returned."
           ::= { l2tpUdpStatsEntry 2 }

   l2tpUdpStatsLocalPort   OBJECT-TYPE
           SYNTAX          Integer32 (0..65535)
           MAX-ACCESS      read-only
           STATUS          current
           DESCRIPTION
              "This object reflects the local UDP port number
               that this tunnel is bound to."
           ::= { l2tpUdpStatsEntry 3 }

   --
   --      Definition of generic L2TP notifications
   --

   l2tpTunnelAuthFailure NOTIFICATION-TYPE
           OBJECTS         {
                           l2tpTunnelStatsInitiated,
                           l2tpTunnelStatsRemoteHostName
                           }
           STATUS          current
           DESCRIPTION
              "A l2tpTunnelAuthFailure trap signifies that an
               attempt to establish a tunnel to a remote peer
               has failed authentication."
           ::= { l2tpNotifications 1 }

   --
   --      conformance information
   --

   l2tpGroups      OBJECT IDENTIFIER ::= { l2tpConformance 1 }
   l2tpCompliances OBJECT IDENTIFIER ::= { l2tpConformance 2 }

   --
   --      compliance statements
   --

   l2tpMIBFullCompliance MODULE-COMPLIANCE
           STATUS          current
           DESCRIPTION
              "When this MIB is implemented with support for
               read-create and read-write, then such an



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               implementation can claim full compliance. Such
               an implementation can then be both monitored
               and configured with this MIB."

           MODULE          -- this module

        -- unconditionally mandatory groups
           MANDATORY-GROUPS {
                               l2tpConfigGroup,
                               l2tpStatsGroup,
                               l2tpTrapGroup
                            }
        -- conditionally mandatory groups
           GROUP           l2tpIpUdpGroup
           DESCRIPTION
              "This group is mandatory for implementations that
               support L2TP over UDP/IP."

        -- optional groups
           GROUP           l2tpDomainGroup
           DESCRIPTION
              "This group is optional for L2TP devices that
               group tunnel endpoints into tunnel domains."

        -- optional Mapping Group
           GROUP           l2tpMappingGroup
           DESCRIPTION
              "This group is optional for L2TP devices that
               provide index mapping."

        -- optional Security Group
           GROUP           l2tpSecurityGroup
           DESCRIPTION
              "This group is optional for SNMP agents which support
               both authentication and privacy of SNMP messages for
               the management of L2TP keys."

        -- optional High Capacity Group
           GROUP           l2tpHCPacketGroup
           DESCRIPTION
              "This group is mandatory for implementations that
               support the l2tpDomainGroup AND could potentially
               overflow the L2TP Domain 32-bit counters is less
               than one hour."

          ::= { l2tpCompliances 1 }

   l2tpMIBReadOnlyCompliance MODULE-COMPLIANCE



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           STATUS          current
           DESCRIPTION
              "When this MIB is implemented without support for
               read-create and read-write (i.e. in read-only mode),
               then such an implementation can claim read-only
               compliance. Such an implementation can then be
               monitored but can not be configured with this MIB."

           MODULE          -- this module

        -- unconditionally mandatory groups
           MANDATORY-GROUPS {
                               l2tpConfigGroup,
                               l2tpStatsGroup,
                               l2tpTrapGroup
                            }

           OBJECT   l2tpAdminState
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDrainTunnels
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigDomainId
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigHelloInterval
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigIdleTimeout
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigControlRWS
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigControlMaxRetx



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           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigControlMaxRetxTO
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigPayloadSeq
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigReassemblyTO
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigTransport
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigDrainTunnel
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigProxyPPPAuth
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

        -- conditionally mandatory groups
           GROUP           l2tpIpUdpGroup
           DESCRIPTION
              "This group is mandatory for implementations that
               support L2TP over UDP/IP."

        -- optional groups
           GROUP           l2tpDomainGroup
           DESCRIPTION
              "This group is optional for L2TP devices that
               group tunnel endpoints into tunnel domains."

           OBJECT   l2tpDomainConfigAdminState
           MIN-ACCESS read-only



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           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDomainConfigDrainTunnels
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDomainConfigTunnelHelloInt
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDomainConfigTunnelIdleTO
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDomainConfigControlRWS
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDomainConfigControlMaxRetx
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDomainConfigControlMaxRetxTO
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDomainConfigPayloadSeq
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDomainConfigReassemblyTO
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDomainConfigProxyPPPAuth
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."




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           OBJECT   l2tpDomainConfigStorageType
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDomainConfigStatus
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

        -- optional Mapping Group
           GROUP           l2tpMappingGroup
           DESCRIPTION
              "This group is optional for L2TP devices that
               provide index mapping."

           OBJECT   l2tpSessionMapTunnelIfIndex
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpSessionMapStatus
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

        -- optional Security Group
           GROUP           l2tpSecurityGroup
           DESCRIPTION
              "This group is optional for SNMP agents which support
               both authentication and privacy of SNMP messages for
               the management of L2TP keys."

           OBJECT   l2tpDomainConfigAuth
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDomainConfigSecret
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpDomainConfigTunnelSecurity
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."




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           OBJECT   l2tpTunnelConfigAuth
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigSecret
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

           OBJECT   l2tpTunnelConfigSecurity
           MIN-ACCESS read-only
           DESCRIPTION
              "Write access is not required."

        -- optional High Capacity Group
           GROUP           l2tpHCPacketGroup
           DESCRIPTION
              "This group is mandatory for implementations that
               support the l2tpDomainGroup AND could potentially
               overflow the L2TP Domain 32-bit counters is less
               than one hour."

           ::= { l2tpCompliances 2 }

   -- units of conformance

   l2tpConfigGroup OBJECT-GROUP
           OBJECTS {
               l2tpAdminState,
               l2tpDrainTunnels,
               l2tpTunnelConfigDomainId,
               l2tpTunnelConfigHelloInterval,
               l2tpTunnelConfigIdleTimeout,
               l2tpTunnelConfigControlRWS,
               l2tpTunnelConfigControlMaxRetx,
               l2tpTunnelConfigControlMaxRetxTO,
               l2tpTunnelConfigPayloadSeq,
               l2tpTunnelConfigReassemblyTO,
               l2tpTunnelConfigTransport,
               l2tpTunnelConfigDrainTunnel,
               l2tpTunnelConfigProxyPPPAuth
           }
           STATUS          current
           DESCRIPTION
              "A collection of objects providing configuration
               information of the L2TP protocol, tunnels and
               sessions."



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           ::= { l2tpGroups 1 }

   l2tpStatsGroup OBJECT-GROUP
           OBJECTS {
               l2tpProtocolVersions,
               l2tpVendorName,
               l2tpFirmwareRev,
               l2tpDrainingTunnels,
               l2tpTunnelStatsLocalTID,
               l2tpTunnelStatsRemoteTID,
               l2tpTunnelStatsState,
               l2tpTunnelStatsInitiated,
               l2tpTunnelStatsRemoteHostName,
               l2tpTunnelStatsRemoteVendorName,
               l2tpTunnelStatsRemoteFirmwareRev,
               l2tpTunnelStatsRemoteProtocolVer,
               l2tpTunnelStatsInitialRemoteRWS,
               l2tpTunnelStatsBearerCaps,
               l2tpTunnelStatsFramingCaps,
               l2tpTunnelStatsControlRxPkts,
               l2tpTunnelStatsControlRxZLB,
               l2tpTunnelStatsControlOutOfSeq,
               l2tpTunnelStatsControlOutOfWin,
               l2tpTunnelStatsControlTxPkts,
               l2tpTunnelStatsControlTxZLB,
               l2tpTunnelStatsControlAckTO,
               l2tpTunnelStatsCurrentRemoteRWS,
               l2tpTunnelStatsTxSeq,
               l2tpTunnelStatsTxSeqAck,
               l2tpTunnelStatsRxSeq,
               l2tpTunnelStatsRxSeqAck,
               l2tpTunnelStatsTotalSessions,
               l2tpTunnelStatsFailedSessions,
               l2tpTunnelStatsActiveSessions,
               l2tpTunnelStatsLastResultCode,
               l2tpTunnelStatsLastErrorCode,
               l2tpTunnelStatsLastErrorMessage,
               l2tpTunnelStatsDrainingTunnel,
               l2tpSessionStatsIfIndex,
               l2tpSessionStatsRemoteSID,
               l2tpSessionStatsUserName,
               l2tpSessionStatsState,
               l2tpSessionStatsCallType,
               l2tpSessionStatsCallSerialNumber,
               l2tpSessionStatsTxConnectSpeed,
               l2tpSessionStatsRxConnectSpeed,
               l2tpSessionStatsCallBearerType,
               l2tpSessionStatsFramingType,



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               l2tpSessionStatsPhysChanId,
               l2tpSessionStatsDNIS,
               l2tpSessionStatsCLID,
               l2tpSessionStatsSubAddress,
               l2tpSessionStatsPrivateGroupID,
               l2tpSessionStatsProxyLcp,
               l2tpSessionStatsAuthMethod,
               l2tpSessionStatsSequencingState,
               l2tpSessionStatsOutSequence,
               l2tpSessionStatsReassemblyTO,
               l2tpSessionStatsTxSeq,
               l2tpSessionStatsRxSeq
           }
           STATUS          current
           DESCRIPTION
              "A collection of objects providing status and
               statistics of the L2TP protocol, tunnels and
               sessions."
           ::= { l2tpGroups 2 }

   l2tpIpUdpGroup OBJECT-GROUP
           OBJECTS {
               l2tpUdpStatsPeerPort,
               l2tpUdpStatsLocalPort
           }
           STATUS          current
           DESCRIPTION
              "A collection of objects providing status and
               statistics of the L2TP UDP/IP transport layer."
           ::= { l2tpGroups 3 }

   l2tpDomainGroup OBJECT-GROUP
           OBJECTS {
               l2tpDomainConfigAdminState,
               l2tpDomainConfigDrainTunnels,
               l2tpDomainConfigTunnelHelloInt,
               l2tpDomainConfigTunnelIdleTO,
               l2tpDomainConfigControlRWS,
               l2tpDomainConfigControlMaxRetx,
               l2tpDomainConfigControlMaxRetxTO,
               l2tpDomainConfigPayloadSeq,
               l2tpDomainConfigReassemblyTO,
               l2tpDomainConfigProxyPPPAuth,
               l2tpDomainConfigStorageType,
               l2tpDomainConfigStatus,
               l2tpDomainStatsTotalTunnels,
               l2tpDomainStatsFailedTunnels,
               l2tpDomainStatsFailedAuths,



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               l2tpDomainStatsActiveTunnels,
               l2tpDomainStatsTotalSessions,
               l2tpDomainStatsFailedSessions,
               l2tpDomainStatsActiveSessions,
               l2tpDomainStatsDrainingTunnels,
               l2tpDomainStatsControlRxOctets,
               l2tpDomainStatsControlRxPkts,
               l2tpDomainStatsControlTxOctets,
               l2tpDomainStatsControlTxPkts,
               l2tpDomainStatsPayloadRxOctets,
               l2tpDomainStatsPayloadRxPkts,
               l2tpDomainStatsPayloadRxDiscs,
               l2tpDomainStatsPayloadTxOctets,
               l2tpDomainStatsPayloadTxPkts
           }
           STATUS          current
           DESCRIPTION
              "A collection of objects providing configuration,
               status and statistics of L2TP tunnel domains."
           ::= { l2tpGroups 4 }

   l2tpMappingGroup OBJECT-GROUP
           OBJECTS {
               l2tpTunnelMapIfIndex,
               l2tpSessionMapTunnelIfIndex,
               l2tpSessionMapLocalSID,
               l2tpSessionMapStatus
           }
           STATUS          current
           DESCRIPTION
              "A collection of objects providing index mapping."
           ::= { l2tpGroups 5 }

   l2tpSecurityGroup OBJECT-GROUP
           OBJECTS {
               l2tpDomainConfigAuth,
               l2tpDomainConfigSecret,
               l2tpDomainConfigTunnelSecurity,
               l2tpTunnelConfigAuth,
               l2tpTunnelConfigSecret,
               l2tpTunnelConfigSecurity
           }
           STATUS          current
           DESCRIPTION
              "A collection of objects providing L2TP security
               configuration."
           ::= { l2tpGroups 6 }




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   l2tpTrapGroup NOTIFICATION-GROUP
           NOTIFICATIONS {
               l2tpTunnelAuthFailure
           }
           STATUS          current
           DESCRIPTION
              "A collection of L2TP trap events as specified
               in NOTIFICATION-TYPE constructs."
           ::= { l2tpGroups 7 }

   l2tpHCPacketGroup OBJECT-GROUP
           OBJECTS {
               l2tpDomainStatsControlHCRxOctets,
               l2tpDomainStatsControlHCRxPkts,
               l2tpDomainStatsControlHCTxOctets,
               l2tpDomainStatsControlHCTxPkts,
               l2tpDomainStatsPayloadHCRxOctets,
               l2tpDomainStatsPayloadHCRxPkts,
               l2tpDomainStatsPayloadHCRxDiscs,
               l2tpDomainStatsPayloadHCTxOctets,
               l2tpDomainStatsPayloadHCTxPkts
            }
           STATUS          current
           DESCRIPTION
              "A collection of objects providing High Capacity
               64-bit counter objects."
           ::= { l2tpGroups 8 }

   END

5.0 Security Considerations

   This MIB contains readable objects whose values provide information
   related to L2TP tunnel interfaces.  There are also a number of
   objects that have a MAX-ACCESS clause of read-write and/or read-
   create, such as those which allow an administrator to dynamically
   configure tunnels.

   While unauthorized access to the readable objects is relatively
   innocuous, unauthorized access to the write-able objects could cause
   a denial of service, or could cause unauthorized creation and/or
   manipulation of tunnels.  Hence, the support for SET operations in a
   non-secure environment without proper protection can have a negative
   effect on network operations.







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   SNMPv1 by itself is such an insecure environment.  Even if the
   network itself is secure (for example by using IPSec [RFC2401]), even
   then, there is no control as to who on the secure network is allowed
   to access and SET (change/create/delete) the objects in this MIB.

   If the agent allows configuring keys (for example the
   l2tpDomainConfigSecret object) via SNMP, for use by L2TP, then the
   security of L2TP is at best only as secure as SNMP.  For this reason,
   all objects in the l2tpSecurityGroup MUST NOT be accessible via
   unencrypted messages.  It is also recommended that keys not be made
   visible through SNMP GET (or GET-NEXT or GET-BULK) messages, even if
   encryption is used.

   It is recommended that the implementers consider the security
   features as provided by the SNMPv3 framework.  Specifically, the use
   of the User-based Security Model RFC 2574 [RFC2574] and the View-
   based Access Control Model RFC 2575 [RFC2575] is recommended.

   It is then a customer/user responsibility to ensure that the SNMP
   entity giving access to this MIB, is properly configured to give
   access to those objects only to those principals (users) that have
   legitimate rights to access them.

6.0 Acknowledgements

   Many thanks to the L2TP working group members who provided valuable
   input into the content and structure of this MIB.

7.0 References

   [RFC2571] Harrington, D., Presuhn, R. and B. Wijnen, "An Architecture
             for Describing SNMP Management Frameworks", RFC 2571, April
             1999.

   [RFC1155] Rose, M. and K. McCloghrie, "Structure and Identification
             of Management Information for TCP/IP-based Internets", STD
             16, RFC 1155, May 1990.

   [RFC1212] Rose, M. and K. McCloghrie, "Concise MIB Definitions",
             STD 16, RFC 1212, March 1991.

   [RFC1215] Rose, M., "A Convention for Defining Traps for use with
             the SNMP", RFC 1215, March 1991.

   [RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
             Rose, M. and S. Waldbusser, "Structure of Management
             Information Version 2 (SMIv2)", STD 58, RFC 2578, April
             1999.



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   [RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
             Rose, M. and S. Waldbusser, "Textual Conventions for
             SMIv2", STD 58, RFC 2579, April 1999.

   [RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
             Rose, M. and S. Waldbusser, "Conformance Statements for
             SMIv2", STD 58, RFC 2580, April 1999.

   [RFC1157] Case, J., Fedor, M., Schoffstall, M. and J. Davin,
             "Simple Network Management Protocol", STD 15, RFC 1157,
             May 1990.

   [RFC1901] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
             "Introduction to Community-based SNMPv2", RFC 1901,
             January 1996.

   [RFC1906] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
             "Transport Mappings for Version 2 of the Simple Network
             Management Protocol (SNMPv2)", RFC 1906, January 1996.

   [RFC2572] Case, J., Harrington D., Presuhn R. and B. Wijnen,
             "Message Processing and Dispatching for the Simple
             Network Management Protocol (SNMP)", RFC 2572, April
             1999.

   [RFC2574] Blumenthal, U. and B. Wijnen, "User-based Security Model
             (USM) for version 3 of the Simple Network Management
             Protocol (SNMPv3)", RFC 2574, April 1999.

   [RFC1905] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
             "Protocol Operations for Version 2 of the Simple Network
             Management Protocol (SNMPv2)", RFC 1905, January 1996.

   [RFC2573] Levi, D., Meyer, P. and B. Stewart, "SNMPv3 Applications",
             RFC 2573, April 1999.

   [RFC2575] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based
             Access Control Model (VACM) for the Simple Network
             Management Protocol (SNMP)", RFC 2575, April 1999.

   [RFC2570] Case, J., Mundy, R., Partain, D. and B. Stewart,
             "Introduction to Version 3 of the Internet-standard
             Network Management Framework", RFC 2570, April 1999.

   [RFC2661] Townsley, W., Valencia, A., Rubens, A., Pall, G., Zorn, G.
             and B. Palter, "Layer Two Tunneling Protocol - L2TP", RFC
             2661, August 1999.



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   [RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
             MIB", RFC 2863, June 2000.

   [RFC2667] Thaler, D., "IP Tunnel MIB", RFC 2667, August 1999.

   [RFC2401] Kent, S. and R. Atkinson,  "Security Architecture for the
             Internet Protocol", RFC 2401, November 1998.

8.0 Authors' Addresses

   Evan Caves
   Occam Networks Inc.
   77 Robin Hill Road
   Santa Barbara, CA 93117

   EMail: evan@occamnetworks.com


   Pat Calhoun
   Black Storm Networks
   110 Nortech Parkway
   San Jose, CA 95134

   EMail: pcalhoun@bstormnetworks.com


   Ross Wheeler
   DoubleWide Software, Inc.
   2953 Bunker Hill Lane
   Suite 101
   Santa Clara, CA 95054

   Email: ross@doublewidesoft.com

















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9.0  Full Copyright Statement

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of
   developing Internet standards in which case the procedures for
   copyrights defined in the Internet Standards process must be
   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.



















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