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+Network Working Group K. Dubray
+Request for Comments: 2432 IronBridge Networks
+Category: Informational October 1998
+
+
+ Terminology for IP Multicast Benchmarking
+
+Status of this Memo
+
+ This memo provides information for the Internet community. It does
+ not specify an Internet standard of any kind. Distribution of this
+ memo is unlimited.
+
+Copyright Notice
+
+ Copyright (C) The Internet Society (1998). All Rights Reserved.
+
+Abstract
+
+ The purpose of this document is to define terminology specific to the
+ benchmarking of multicast IP forwarding devices. It builds upon the
+ tenets set forth in RFC 1242, RFC 2285, and other IETF Benchmarking
+ Methodology Working Group (BMWG) efforts. This document seeks to
+ extend these efforts to the multicast paradigm.
+
+ The BMWG produces two major classes of documents: Benchmarking
+ Terminology documents and Benchmarking Methodology documents. The
+ Terminology documents present the benchmarks and other related terms.
+ The Methodology documents define the procedures required to collect
+ the benchmarks cited in the corresponding Terminology documents.
+
+1. Introduction
+
+ Network forwarding devices are being required to take a single frame
+ and support delivery to a number of destinations having membership to
+ a particular group. As such, multicast support may place a different
+ burden on the resources of these network forwarding devices than with
+ unicast or broadcast traffic types.
+
+ Such burdens may not be readily apparent at first glance - the IP
+ multicast packet's Class D address may be the only noticeable
+ difference from an IP unicast packet. However, there are many
+ factors that may impact the treatment of IP multicast packets.
+
+ Consider how a device's architecture may impact the handling of a
+ multicast frame. For example, is the multicast packet subject to the
+ same processing as its unicast analog? Or is the multicast packet
+ treated as an exeception and processed on a different data path?
+
+
+
+Dubray Informational [Page 1]
+
+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+ Consider, too, how a shared memory architecture may demonstrate a
+ different performance profile than an architecture which explicitly
+ passes each individual packet between the processing entities.
+
+ In addition to forwarding device architecture, there are other
+ factors that may impact a device's or system's multicast related
+ performance. Protocol requirements may demand that routers and
+ switches consider destination and source addressing in its multicast
+ forwarding decisions. Capturing multicast source/destination
+ addressing information may impact forwarding table size and lengthen
+ lookups. Topological factors such as the degree of packet
+ replication, the number of multicast groups being supported by the
+ system, or the placement of multicast packets in unicast wrappers to
+ span non-multicast network paths may all potentially affect a
+ system's multicast related performance. For an overall understanding
+ of IP multicasting, the reader is directed to [Se98], [Hu95], and
+ [Mt98].
+
+ By clearly identifying IP multicast benchmarks and related
+ terminology in this document, it is hoped that detailed methodologies
+ can be generated in subsequent documents. Taken in tandem, these two
+ efforts endeavor to assist the clinical, empirical, and consistent
+ characterization of certain aspects of multicast technologies and
+ their individual implementations. Understanding the operational
+ profile of multicast forwarding devices may assist the network
+ designer to better deploy multicast in his or her networking
+ environment.
+
+ Moreover, this document focuses on one source to many destinations
+ profiling. Elements of this document may require extension when
+ considering multiple source to multiple destination IP multicast
+ communication.
+
+2. Definition Format
+
+ This section cites the template suggested by RFC 1242 in the
+ specification of a term to be defined.
+
+ Term to be defined.
+
+ Definition:
+ The specific definition for the term.
+
+ Discussion:
+ A brief discussion of the term, its application, or other
+ information that would build understanding.
+
+
+
+
+
+Dubray Informational [Page 2]
+
+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+ Measurement units:
+ Units used to record measurements of this term, if applicable.
+
+ [Issues:]
+ List of issues or conditions that affect this term. This field can
+ present items the may impact the term's related methodology or
+ otherwise restrict its measurement procedures. This field is
+ optional in this document.
+
+ [See Also:]
+ List of other terms that are relevant to the discussion of this
+ term. This field is optional in this document.
+
+2.1 Existing Terminology
+
+ This document draws on existing terminology defined in other BMWG
+ work. Examples include, but are not limited to:
+
+ Throughput [RFC 1242, section 3.17]
+ Latency [RFC 1242, section 3.8]
+ Constant Load [RFC 1242, section 3.4]
+ Frame Loss Rate [RFC 1242, section 3.6]
+ Overhead behavior [RFC 1242, section 3.11]
+ Forwarding Rates [RFC 2285, section 3.6]
+ Loads [RFC 2285, section 3.5]
+ Device Under Test (DUT) [RFC 2285, section 3.1.1]
+ System Under Test (SUT) [RFC 2285, section 3.1.2]
+
+ Note: "DUT/SUT" refers to a metric that may be applicable to a DUT or
+ SUT.
+
+3. Table of Defined Terms
+
+ 3.1 General Nomenclature
+
+ 3.1.1 Traffic Class. (TC)
+ 3.1.2 Group Class. (GC)
+ 3.1.3 Service Class. (SC)
+
+ 3.2 Forwarding and Throughput
+ 3.2.1 Mixed Class Throughput (MCT).
+ 3.2.2 Scaled Group Forwarding Matrix (SGFM).
+ 3.2.3 Aggregated Multicast Throughput (AMT)
+ 3.2.4 Encapsulation Throughput (ET)
+ 3.2.5 Decapsulation Throughput (DT)
+ 3.2.6 Re-encapsulation Throughput (RET)
+
+
+
+
+
+Dubray Informational [Page 3]
+
+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+ 3.3 Forwarding Latency
+ 3.3.1 Multicast Latency (ML)
+ 3.3.2 Min/Max Multicast Latency (Min/Max ML)
+
+ 3.4 Overhead
+ 3.4.1 Group Join Delay. (GJD)
+ 3.4.2 Group Leave Delay. (GLD)
+
+ 3.5 Capacity
+ 3.5.1 Multicast Group Capacity. (MGC)
+
+ 3.6 Interaction
+ 3.6.1 Burdened Response
+ 3.6.2 Forwarding Burdened Multicast Latency (FBML)
+ 3.6.3 Forwarding Burdened Join Delay (FBJD)
+
+3.1 General Nomenclature
+
+ This section will present general terminology to be used in this and
+ other documents.
+
+3.1.1 Traffic Class. (TC)
+
+ Definition:
+ An equivalence class of packets comprising one or more data
+ streams.
+
+ Discussion:
+ In the scope of this document, Traffic Class will be considered a
+ logical identifier used to discriminate between a set or sets of
+ packets offered the DUT.
+
+ For example, one Traffic Class may identify a set of unicast
+ packets offered to the DUT. Another Traffic Class may
+ differentiate the multicast packets destined to multicast group X.
+ Yet another Class may distinguish the set of multicast packets
+ destined to multicast group Y.
+
+ Unless otherwise qualified, the usage of the word "Class" in this
+ document will refer simply to a Traffic Class.
+
+ Measurement units:
+ Not applicable.
+
+
+
+
+
+
+
+
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+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+3.1.2 Group Class. (GC)
+
+ Definition:
+ A specific type of Traffic Class where the packets comprising the
+ Class are destined to a particular multicast group.
+
+ Discussion:
+
+ Measurement units:
+ Not applicable.
+
+3.1.3 Service Class. (SC)
+
+ Definition:
+ A specific type of Traffic Class where the packets comprising the
+ Class require particular treatment or treatments by the network
+ forwarding devices along the path to the packets' destination(s).
+
+ Discussion:
+
+ Measurement units:
+ Not applicable.
+
+3.2 Forwarding and Throughput.
+
+ This section presents terminology related to the characterization of
+ the packet forwarding ability of a DUT/SUT in a multicast
+ environment. Some metrics extend the concept of throughput presented
+ in RFC 1242. The notion of Forwarding Rate is cited in RFC 2285.
+
+3.2.1 Mixed Class Throughput (MCT).
+
+ Definition:
+ The maximum rate at which none of the offered frames, comprised
+ from a unicast Class and a multicast Class, to be forwarded are
+ dropped by the device across a fixed number of ports.
+
+ Discussion:
+ Often times, throughput is collected on a homogenous traffic class
+ - the offered load to the DUT is either singularly unicast or
+ singularly multicast. In most networking environments, the
+ traffic mix is seldom so uniformly distributed.
+
+ Based on the RFC 1242 definition for throughput, the Mixed Class
+ Throughput benchmark attempts to characterize the DUT's ability to
+ process both unicast and multicast frames in the same aggregated
+ traffic stream.
+
+
+
+
+Dubray Informational [Page 5]
+
+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+ Measurement units:
+ Frames per second
+
+ Issues:
+ Related methodology may have to address the ratio of unicast
+ packets to multicast packets.
+
+ Since frame size can sometimes be a factor in frame forwarding
+ benchmarks, the corresponding methodology for this metric will
+ need to consider frame size distribution(s).
+
+3.2.2 Scaled Group Forwarding Matrix (SGFM).
+
+ Definition:
+ A table that demonstrates Forwarding Rate as a function of tested
+ multicast groups for a fixed number of tested DUT/SUT ports.
+
+ Discussion:
+ A desirable attribute of many Internet mechanisms is the ability
+ to "scale." This benchmark seeks to demonstrate the ability of a
+ SUT to forward as the number of multicast groups is scaled
+ upwards.
+
+ Measurement units:
+ Packets per second, with corresponding tested multicast group and
+ port configurations.
+
+ Issues:
+ The corresponding methodology may have to reflect the impact that
+ the pairing (source, group) has on many multicast routing
+ protocols.
+
+ Since frame size can sometimes be a factor in frame forwarding
+ benchmarks, the corresponding methodology for this metric will
+ need to consider frame size distribution(s).
+
+3.2.3 Aggregated Multicast Throughput (AMT)
+
+ Definition:
+ The maximum rate at which none of the offered frames to be
+ forwarded through N destination interfaces of the same multicast
+ group are dropped.
+
+ Discussion:
+ Another "scaling" type of exercise, designed to identify the
+ DUT/SUT's ability to handle traffic as a function of the multicast
+ destination ports it is required to support.
+
+
+
+
+Dubray Informational [Page 6]
+
+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+ Measurement units:
+ The ordered pair (N,t) where,
+
+ N = the number of destination ports of the multicast group.
+ t = the throughput, in frames per second, relative to the
+ source stream.
+
+ Issues:
+ Since frame size can sometimes be a factor in frame forwarding
+ benchmarks, the corresponding methodology for this metric will
+ need to consider frame size distribution(s).
+
+3.2.4 Encapsulation Throughput (ET)
+
+ Definition:
+ The maximum rate at which frames offered a DUT are encapsulated
+ and correctly forwarded by the DUT without loss.
+
+ Discussion:
+ A popular technique in presenting a frame to a device that may not
+ support a protocol feature is to encapsulate, or tunnel, the
+ packet containing the unsupported feature in a format that is
+ supported by that device.
+
+ More specifically, encapsulation refers to the act of taking a
+ frame or part of a frame and embedding it as a payload of another
+ frame. This benchmark attempts to characterize the overhead
+ behavior associated with that translational process.
+
+ Measurement units:
+ Frames per second.
+
+ Issues:
+ Consideration may need to be given with respect to the impact of
+ different frame formats on usable bandwidth.
+
+ Since frame size can sometimes be a factor in frame forwarding
+ benchmarks, the corresponding methodology for this metric will
+ need to consider frame size distribution(s).
+
+3.2.5 Decapsulation Throughput (DT)
+
+ Definition:
+ The maximum rate at which frames offered a DUT are decapsulated
+ and correctly forwarded by the DUT without loss.
+
+
+
+
+
+
+Dubray Informational [Page 7]
+
+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+ Discussion:
+ A popular technique in presenting a frame to a device that may not
+ support a protocol feature is to encapsulate, or tunnel, the
+ packet containing the unsupported feature in a format that is
+ supported by that device. At some point, the frame may be required
+ to be returned its orginal format from its encapsulation wrapper
+ for use by the frame's next destination.
+
+ More specifically, decapsulation refers to the act of taking a
+ frame or part of a frame embedded as a payload of another frame
+ and returning it to the payload's appropriate format. This
+ benchmark attempts to characterize the overhead behavior
+ associated with that translational process.
+
+ Measurement units:
+ Frames per second.
+
+ Issues:
+ Consideration may need to be given with respect to the impact of
+ different frame formats on usable bandwidth.
+
+ Since frame size can sometimes be a factor in frame forwarding
+ benchmarks, the corresponding methodology for this metric will
+ need to consider frame size distribution(s).
+
+3.2.6 Re-encapsulation Throughput (RET)
+
+ Definition:
+ The maximum rate at which frames of one encapsulated format
+ offered a DUT are converted to another encapsulated format and
+ correctly forwarded by the DUT without loss.
+
+ Discussion:
+ A popular technique in presenting a frame to a device that may not
+ support a protocol feature is to encapsulate, or tunnel, the
+ packet containing the unsupported feature in a format that is
+ supported by that device. At some point, the frame may be required
+ to be converted from one encapsulation format to another
+ encapsulation format.
+
+ More specifically, re-encapsulation refers to the act of taking an
+ encapsulated payload of one format and replacing it with another
+ encapsulated format - all the while preserving the original
+ payload's contents. This benchmark attempts to characterize the
+ overhead behavior associated with that translational process.
+
+ Measurement units:
+ Frames per second.
+
+
+
+Dubray Informational [Page 8]
+
+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+ Issues:
+ Consideration may need to be given with respect to the impact of
+ different frame formats on usable bandwidth.
+
+ Since frame size can sometimes be a factor in frame forwarding
+ benchmarks, the corresponding methodology for this metric will
+ need to consider frame size distribution(s).
+
+3.3 Forwarding Latency.
+
+ This section presents terminology relating to the characterization of
+ the forwarding latency of a DUT/SUT in a multicast environment. It
+ extends the concept of latency presented in RFC 1242.
+
+3.3.1 Multicast Latency. (ML)
+
+ Definition:
+ The set of individual latencies from a single input port on the
+ DUT or SUT to all tested ports belonging to the destination
+ multicast group.
+
+ Discussion:
+ This benchmark is based on the RFC 1242 definition of latency.
+ While it is useful to collect latency between a pair of source and
+ destination multicast ports, it may be insightful to collect the
+ same type of measurements across a range of ports supporting that
+ Group Class.
+
+ A variety of statistical exercises can be applied to the set of
+ latencies measurements.
+
+ Measurement units:
+ Time units with enough precision to reflect a latency measurement.
+
+3.3.2 Min/Max Multicast Latency. (Min/Max ML)
+
+ Definition:
+ The difference between the maximum latency measurement and the
+ minimum latency measurement from the set of latencies produced by
+ the Multicast Latency benchmark.
+
+ Discussion:
+ This statistic may yield some insight into how a particular
+ implementation handles its multicast traffic. This may be useful
+ to users of multicast synchronization types of applications.
+
+ Measurement units:
+ Time units with enough precision to reflect latency measurement.
+
+
+
+Dubray Informational [Page 9]
+
+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+3.4 Overhead
+
+ This section presents terminology relating to the characterization of
+ the overhead delays associated with explicit operations found in
+ multicast environments.
+
+3.4.1 Group Join Delay. (GJD)
+
+ Definition:
+ The time duration it takes a DUT to start forwarding multicast
+ packets from the time a successful IGMP group membership report
+ has been issued to the DUT.
+
+ Discussion:
+ Many factors can contribute to different results, such as the
+ number or type of multicast-related protocols configured on the
+ device under test. Other factors are physical topology and "tree"
+ configuration.
+
+ Because of the number of variables that could impact this metric,
+ the metric may be a better characterization tool for a device
+ rather than a basis for comparisons with other devices.
+
+ Issues:
+ A consideration for the related methodology: possible need to
+ differentiate a specifically-forwarded multicast frame from those
+ sprayed by protocols implementing a flooding tactic to solicit
+ prune feedback.
+
+ While this metric attempts to identify a simple delay, the
+ underlying and contributing delay components (e.g., propagation
+ delay, frame processing delay, etc.) make this a less than simple
+ measurement. The corresponding methodology will need to consider
+ this and similar factors to ensure a consistent and precise metric
+ result.
+
+ Measurement units:
+ Microseconds.
+
+3.4.2 Group Leave Delay. (GLD)
+
+ Definition:
+ The time duration it takes a DUT to cease forwarding multicast
+ packets after a corresponding IGMP "Leave Group" message has been
+ successfully offered to the DUT.
+
+
+
+
+
+
+Dubray Informational [Page 10]
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+
+
+ Discussion:
+ While it is important to understand how quickly a device can
+ process multicast frames; it may be beneficial to understand how
+ quickly that same device can stop the process as well.
+
+ Because of the number of variables that could impact this metric,
+ the metric may be a better characterization tool for a device
+ rather than a basis for comparisons with other devices.
+
+ Measurement units:
+ Microseconds.
+
+ Issues:
+ The Methodology may need to consider protocol-specific timeout
+ values.
+
+ While this metric attempts to identify a simple delay, the
+ underlying and contributing delay components (e.g., propagation
+ delay, frame processing delay, etc.) make this a less than simple
+ measurement. Moreover, the cessation of traffic is a rather
+ unobservable event (i.e., at what point is the multicast forwarded
+ considered stopped on the DUT interface processing the Leave?).
+ The corresponding methodology will need to consider this and
+ similar factors to ensure a consistent and precise metric result.
+
+3.5 Capacity
+
+ This section offers terms relating to the identification of multicast
+ group limits of a DUT/SUT.
+
+3.5.1 Multicast Group Capacity. (MGC)
+
+ Definition:
+ The maximum number of multicast groups a SUT/DUT can support while
+ maintaining the ability to forward multicast frames to all
+ multicast groups registered to that SUT/DUT.
+
+ Discussion:
+
+ Measurement units:
+ Multicast groups.
+
+ Issues:
+ The related methodology may have to consider the impact of
+ multicast sources per group on the ability of a SUT/DUT to "scale
+ up" the number of supportable multicast groups.
+
+
+
+
+
+Dubray Informational [Page 11]
+
+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+3.6 Interaction
+
+ Network forwarding devices are generally required to provide more
+ functionality than than the forwarding of traffic. Moreover, network
+ forwarding devices may be asked to provide those functions in a
+ variety of environments. This section offers terms to assist in the
+ charaterization of DUT/SUT behavior in consideration of potentially
+ interacting factors.
+
+3.6.1 Burdened Response.
+
+ Definition:
+ A measured response collected from a DUT/SUT in light of
+ interacting, or potentially interacting, distinct stimulii.
+
+ Discussion:
+ Many metrics provide a one dimensional view into an operating
+ characteristic of a tested system. For example, the forwarding
+ rate metric may yield information about the packet processing
+ ability of a device. Collecting that same metric in view of
+ another control variable can oftentimes be very insightful. Taking
+ that same forwarding rate measurement, for instance, while the
+ device's address table is injected with an additional 50,000
+ entries may yield a different perspective.
+
+ Measurement units:
+ A burdened response is a type of metric. Metrics of this this
+ type must follow guidelines when reporting results.
+
+ The metric's principal result MUST be reported in conjunction with
+ the contributing factors.
+
+ For example, in reporting a Forwarding Burdened Latency, the
+ latency measurement should be reported with respect to
+ corresponding Offered Load and Forwarding Rates.
+
+ Issues: A Burdened response may be very illuminating when trying to
+ characterize a single device or system. Extreme care must be
+ exercised when attempting to use that characterization as a basis
+ of comparison with other devices or systems. Test agents must
+ ensure that the measured response is a function of the controlled
+ stimulii, and not secondary factors. An example of of such an
+ interfering factor would be configuration mismatch of a timer
+ impacting a response process.
+
+
+
+
+
+
+
+Dubray Informational [Page 12]
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+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+3.6.2 Forwarding Burdened Multicast Latency. (FBML)
+
+ Definition:
+ A multicast latency taken from a DUT/SUT in the presence of a
+ traffic forwarding requirement.
+
+ Discussion:
+ This burdened response metric builds on the Multicast Latency
+ definition offered in section 3.3.1. It mandates that the DUT be
+ subjected to an additional measure of traffic not required by the
+ non-burdened metric.
+
+ This metric attempts to provide a means by which to evaluate how
+ traffic load may or may not impact a device's or system's packet
+ processing delay.
+
+ Measurement units:
+ Time units with enough precision to reflect the latencies
+ measurements.
+
+ Latency measurements MUST be reported with the corresponding
+ sustained Forwarding Rate and associated Offered Load.
+
+3.6.3 Forwarding Burdened Group Join Delay. (FBGJD)
+
+ Definition:
+ A multicast Group Join Delay taken from a DUT in the presence of a
+ traffic forwarding requirement.
+
+ Discussion:
+ This burdened response metric builds on the Group Join Delay
+ definition offered in section 3.4.1. It mandates that the DUT be
+ subjected to an additional measure of traffic not required by the
+ non-burdened metric.
+
+ Many factors can contribute to different results, such as the
+ number or type of multicast-related protocols configured on the
+ device under test. Other factors could be physical topology or the
+ logical multicast "tree" configuration.
+
+ Because of the number of variables that could impact this metric,
+ the metric may be a better characterization tool for a device
+ rather than a basis for comparisons with other devices.
+
+ Measurement units:
+ Time units with enough precision to reflect the delay
+ measurements.
+
+
+
+
+Dubray Informational [Page 13]
+
+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+ Delay measurements MUST be reported with the corresponding
+ sustained Forwarding Rate and associated Offered Load.
+
+ Issues:
+ While this metric attempts to identify a simple delay, the
+ underlying and contributing delay components (e.g., propagation
+ delay, frame processing delay, etc.) make this a less than simple
+ measurement. The corresponding methodology will need to consider
+ this and similar factors to ensure a consistent and precise metric
+ result.
+
+4. Security Considerations
+
+ This document addresses metrics and terminology relating to the
+ performance benchmarking of IP Multicast forwarding devices. The
+ information contained in this document does not impact the security
+ of the Internet.
+
+ Methodologies regarding the collection of the metrics described
+ within this document may need to cite security considerations. This
+ document does not address methodological issues.
+
+5. Acknowledgments
+
+ The IETF BMWG participants have made several comments and suggestions
+ regarding this work. Particular thanks goes to Harald Alvestrand,
+ Scott Bradner, Brad Cain, Eric Crawley, Bob Mandeville, David Newman,
+ Shuching Sheih, Dave Thaler, Chuck Winter, Zhaohui Zhang, and John
+ Galgay for their insightful review and assistance.
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
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+
+6. References
+
+ [Br91] Bradner, S., "Benchmarking Terminology for Network
+ Interconnection Devices", RFC 1242, July 1991.
+
+ [Br96] Bradner, S., and J. McQuaid, "Benchmarking Methodology for
+ Network Interconnect Devices", RFC 1944, May 1996.
+
+ [Hu95] Huitema, C. "Routing in the Internet." Prentice-Hall, 1995.
+
+ [Se98] Semeria, C. and Maufer, T. "Introduction to IP Multicast
+ Routing." http://www.3com.com/nsc/501303.html 3Com Corp.,
+ 1998.
+
+ [Ma98] Mandeville, R., "Benchmarking Terminology for LAN Switching
+ Devices", RFC 2285, February 1998.
+
+ [Mt98] Maufer, T. "Deploying IP Multicast in the Enterprise."
+ Prentice-Hall, 1998.
+
+7. Author's Address
+
+ Kevin Dubray
+ IronBridge Networks
+ 55 Hayden Avenue
+ Lexington, MA 02421
+ USA
+
+ Phone: 781 372 8118
+ EMail: kdubray@ironbridgenetworks.com
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
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+
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+Dubray Informational [Page 15]
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+RFC 2432 Terminology for IP Multicast Benchmarking October 1998
+
+
+8. Full Copyright Statement
+
+ Copyright (C) The Internet Society (1998). 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.
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+Dubray Informational [Page 16]
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