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+Network Working Group                                           S. Senum
+Request for Comments: 1764                                     DigiBoard
+Category: Standards Track                                     March 1995
+
+
+                The PPP XNS IDP Control Protocol (XNSCP)
+
+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.
+
+Abstract
+
+   The Point-to-Point Protocol (PPP) [1] provides a standard method for
+   transporting multi-protocol datagrams over point-to-point links.  PPP
+   defines an extensible Link Control Protocol, and proposes a family of
+   Network Control Protocols for establishing and configuring different
+   network-layer protocols.
+
+   This document defines the Network Control Protocol for establishing
+   and configuring the Xerox Network Systems (XNS) Internet Datagram
+   Protocol (IDP) over PPP.
+
+Table of Contents
+
+   1.     Introduction ..........................................    2
+      1.1       Specification of Requirements ...................    2
+      1.2       Terminology .....................................    3
+   2.     A PPP Network Control Protocol for XNS IDP ............    3
+      2.1       Sending XNS IDP Datagrams .......................    4
+   SECURITY CONSIDERATIONS ......................................    5
+   REFERENCES ...................................................    5
+      ACKNOWLEDGEMENTS ..........................................    5
+   CHAIR'S ADDRESS ..............................................    5
+   AUTHOR'S ADDRESS .............................................    5
+
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+Senum                                                           [Page 1]
+
+RFC 1764                       PPP XNSCP                      March 1995
+
+
+1.  Introduction
+
+   PPP has three main components:
+
+      1. A method for encapsulating multi-protocol datagrams.
+
+      2. A Link Control Protocol (LCP) for establishing, configuring,
+         and testing the data-link connection.
+
+      3. A family of Network Control Protocols for establishing and
+         configuring different network-layer protocols.
+
+   In order to establish communications over a point-to-point link, each
+   end of the PPP link must first send LCP packets to configure and test
+   the data link.  After the link has been established and optional
+   facilities have been negotiated as needed by the LCP, PPP must send
+   XNSCP packets to choose and configure the XNS IDP network-layer
+   protocol.  Once XNSCP has reached the Opened state, XNS IDP datagrams
+   can be sent over the link.
+
+   The link will remain configured for communications until explicit LCP
+   or XNSCP packets close the link down, or until some external event
+   occurs (an inactivity timer expires or network administrator
+   intervention).
+
+1.1.  Specification of Requirements
+
+   In this document, several words are used to signify the requirements
+   of the specification.  These words are often capitalized.
+
+   MUST      This word, or the adjective "required", means that the
+             definition is an absolute requirement of the specification.
+
+   MUST NOT  This phrase means that the definition is an absolute
+             prohibition of the specification.
+
+   SHOULD    This word, or the adjective "recommended", means that there
+             may exist valid reasons in particular circumstances to
+             ignore this item, but the full implications must be
+             understood and carefully weighed before choosing a
+             different course.
+
+   MAY       This word, or the adjective "optional", means that this
+             item is one of an allowed set of alternatives.  An
+             implementation which does not include this option MUST be
+             prepared to interoperate with another implementation which
+             does include the option.
+
+
+
+
+Senum                                                           [Page 2]
+
+RFC 1764                       PPP XNSCP                      March 1995
+
+
+1.2.  Terminology
+
+   This document frequently uses the following terms:
+
+   datagram  The unit of transmission in the network layer (such as IP).
+             A datagram may be encapsulated in one or more packets
+             passed to the data link layer.
+
+   frame     The unit of transmission at the data link layer.  A frame
+             may include a header and/or a trailer, along with some
+             number of units of data.
+
+   packet    The basic unit of encapsulation, which is passed across the
+             interface between the network layer and the data link
+             layer.  A packet is usually mapped to a frame; the
+             exceptions are when data link layer fragmentation is being
+             performed, or when multiple packets are incorporated into a
+             single frame.
+
+   peer      The other end of the point-to-point link.
+
+   silently discard
+             This means the implementation discards the packet without
+             further processing.  The implementation SHOULD provide the
+             capability of logging the error, including the contents of
+             the silently discarded packet, and SHOULD record the event
+             in a statistics counter.
+
+2.  A PPP Network Control Protocol for XNS IDP
+
+   The XNS IDP Control Protocol (XNSCP) is responsible for configuring,
+   enabling, and disabling the XNS IDP protocol modules on both ends of
+   the point-to-point link.  XNSCP uses the same packet exchange
+   mechanism as the Link Control Protocol (LCP).  XNSCP packets may not
+   be exchanged until PPP has reached the Network-Layer Protocol phase.
+   XNSCP packets received before this phase is reached should be
+   silently discarded.
+
+   The XNS IDP Control Protocol is exactly the same as the Link Control
+   Protocol [1] with the following exceptions:
+
+   Frame Modifications
+
+      The packet may utilize any modifications to the basic frame format
+      which have been negotiated during the Link Establishment phase.
+
+
+
+
+
+
+Senum                                                           [Page 3]
+
+RFC 1764                       PPP XNSCP                      March 1995
+
+
+   Data Link Layer Protocol Field
+
+      Exactly one XNSCP packet is encapsulated in the Information field
+      of a PPP Data Link Layer frame, where the PPP Protocol field
+      indicates type hex 8025 (XNS IDP Control Protocol).
+
+   Code field
+
+      Only Codes 1 through 7 (Configure-Request, Configure-Ack,
+      Configure-Nak, Configure-Reject, Terminate-Request, Terminate-Ack
+      and Code-Reject) are used.  Other Codes should be treated as
+      unrecognized and should result in Code-Rejects.
+
+   Timeouts
+
+      XNSCP packets may not be exchanged until PPP has reached the
+      Network-Layer Protocol phase.  An implementation should be
+      prepared to wait for Authentication and Link Quality Determination
+      to finish before timing out waiting for a Configure-Ack or other
+      response.  It is suggested that an implementation give up only
+      after user intervention or a configurable amount of time.
+
+   Configuration Option Types
+
+      XNSCP has no Configuration Options.
+
+2.1.  Sending XNS IDP Datagrams
+
+   Before any XNS IDP packets may be communicated, PPP must reach the
+   Network-Layer Protocol phase, and the XNS IDP Control Protocol must
+   reach the Opened state.
+
+   Exactly one XNS IDP packet is encapsulated in the Information field
+   of a PPP Data Link Layer frame where the Protocol field indicates
+   type hex 0025 (XNS IDP datagram).
+
+   The maximum length of a XNS IDP datagram transmitted over a PPP link
+   is the same as the maximum length of the Information field of a PPP
+   data link layer frame.  Since there is no standard method for
+   fragmenting and reassembling XNS IDP datagrams, PPP links supporting
+   XNS IDP MUST allow at least 576 octets in the information field of a
+   data link layer frame.
+
+   The format of the Information field itself is the same as that
+   defined in [2].
+
+
+
+
+
+
+Senum                                                           [Page 4]
+
+RFC 1764                       PPP XNSCP                      March 1995
+
+
+Security Considerations
+
+   Security issues are not discussed in this memo.
+
+References
+
+   [1] Simpson, W., "The Point-to-Point Protocol (PPP)", STD 51, RFC
+       1661, Daydreamer, July 1994.
+
+   [2] Xerox, "Internet Transport Protocols", January 1991, Order No.
+       XNSS 029101.
+
+Acknowledgements
+
+   Some of the text in this document is taken from previous documents
+   produced by the Point-to-Point Protocol Working Group of the Internet
+   Engineering Task Force (IETF).
+
+   In particular, Bill Simpson provided the boiler-plate used to create
+   this document.
+
+Chair's Address
+
+   The working group can be contacted via the current chair:
+
+   Fred Baker
+   Cisco Systems
+   519 Lado Drive
+   Santa Barbara, California 93111
+
+   Phone: (805) 681-0115
+   EMail: fred@cisco.com
+
+Author's Address
+
+   Questions about this memo can also be directed to:
+
+   Steven J. Senum
+   DigiBoard
+   6400 Flying Cloud Drive
+   Eden Prairie, Minnesota 55344
+
+   Phone: (612) 943-9020
+   EMail: sjs@digibd.com
+
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+Senum                                                           [Page 5]
+