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Versions: 00 01 02 RFC 4602

Network Working Group                                        T. Pusateri
Internet-Draft                                          Juniper Networks
Expires: September 6, 2006                                 March 5, 2006


      PIM Sparse-Mode IETF Proposed Standard Requirements Analysis
                     draft-ietf-pim-proposed-req-02

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Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document provides supporting documentation to advance the
   Protocol Independent Multicast (PIM) Sparse-Mode routing protocol
   from the IETF Experimental status to Proposed Standard.

Requirements Language

   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 RFC 2119 [RFC2119].



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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  RFC 1264 Requirements  . . . . . . . . . . . . . . . . . . . .  3
     2.1   Documents specifying the Protocol and its Usage  . . . . .  3
     2.2   Management Information Base  . . . . . . . . . . . . . . .  3
     2.3   Explicit Security Architecture . . . . . . . . . . . . . .  3
     2.4   Implementation Existence . . . . . . . . . . . . . . . . .  3
       2.4.1   XORP . . . . . . . . . . . . . . . . . . . . . . . . .  4
       2.4.2   Cisco IOS/IOX  . . . . . . . . . . . . . . . . . . . .  4
       2.4.3   Infosys Technologies, Ltd. . . . . . . . . . . . . . .  4
       2.4.4   Procket Networks . . . . . . . . . . . . . . . . . . .  4
     2.5   Evidence of Testing  . . . . . . . . . . . . . . . . . . .  4
       2.5.1   Cisco  . . . . . . . . . . . . . . . . . . . . . . . .  4
       2.5.2   XORP . . . . . . . . . . . . . . . . . . . . . . . . .  5
       2.5.3   Procket Networks . . . . . . . . . . . . . . . . . . .  6
     2.6   Suitability  . . . . . . . . . . . . . . . . . . . . . . .  6
     2.7   Authentication Mechanisms  . . . . . . . . . . . . . . . .  6
   3.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  6
   4.  Security Considerations  . . . . . . . . . . . . . . . . . . .  6
   5.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . .  6
   6.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     6.1   Normative References . . . . . . . . . . . . . . . . . . .  7
     6.2   Informative References . . . . . . . . . . . . . . . . . .  7
       Author's Address . . . . . . . . . . . . . . . . . . . . . . .  8
       Intellectual Property and Copyright Statements . . . . . . . .  9

























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1.  Introduction

   This analysis provides supporting documentation to advance the
   Protocol Independent Multicast (PIM) Sparse-Mode routing protocol
   from the IETF Experimental status to Proposed Standard.  PIM Sparse-
   Mode was first published as RFC 2117 [RFC2117] in 1997 and then again
   as RFC 2362 [RFC2362] in 1998.  The protocol was classified as
   Experimental in both of these documents.  The PIM Sparse-Mode
   protocol specification was then rewritten in whole in order to more
   fully specify the protocol.  It is this new specification that is to
   be advanced to Proposed Standard.

2.  RFC 1264 Requirements

   Section 4.0 of RFC 1264 [RFC1264] describes the requirements for
   routing protocols to advance to Proposed Standard.  Each requirement
   is listed below along with an explanation of how the requirement has
   been satisfied.

2.1  Documents specifying the Protocol and its Usage

   The authors of the new PIM Sparse-Mode specification [I-D.ietf-pim-
   sm-v2-new] have taken considerable care to fully specify the protocol
   operation.  It removes all known ambiguities and tries to normalize
   corner cases that existed in the previous specification.  It has been
   used to provide several interoperable implementations by developers
   that were not authors of the specification.  These implementations
   will be described below.

2.2  Management Information Base

   A Management Information Base for PIM is currently specified in RFC
   2934 [RFC2934].  This MIB has many implementations and has been used
   by network management applications for several years.  Updates to
   this MIB to support IPv6 and other improvements based on operation
   experience are in progress in the PIM Working Group of the IETF.

2.3  Explicit Security Architecture

   The new PIM Sparse-Mode protocol specification contains an extensive
   security section explaining its security features and limitations.
   Data integrity protection and groupwise data origin authentication is
   provided for PIM protocol messages.

2.4  Implementation Existence

   There are at least 4 known independent implementations of the new
   protocol specification and there are over 6 independent



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   implementations of a previous version (RFC 2362) of the
   specification.  The new specification was carefully written to be
   backward compatible with the old specification allowing
   implementations compliant with RFC 2362 to also be compliant with the
   new specification.

   The 4 implementations of the new version are described below:

2.4.1  XORP

   The XORP project [XORP] has an open-source implementation of PIM-SM
   v2 as specified in the draft-ietf-pim-sm-v2-new-11.txt.  It was
   written by Pavlin Radoslavov <pavlin@icir.org> and has been available
   to the public since December 2002.  Pavlin is not an author of the
   protocol specification.  It does not use any other existing code as a
   base.

2.4.2  Cisco IOS/IOX

   Cisco Systems, Inc. has written an implementation of the new protocol
   specification which has been deployed in production routers.  There
   exists an IOS implementation for IPv6 only.  There exists an IOX
   implementation for both IPv4 and IPv6.  This code was initially
   written by Isidor Kouvelas <kouvelas@cisco.com>.  It does not depend
   on any existing code base.  Isidor is a co-author of the protocol
   specification.

2.4.3  Infosys Technologies, Ltd.

   Infosys Technologies, Ltd. (www.infosys.com) have developed a limited
   shared tree implementation of the new Sparse-Mode specification
   including PIM Hello messages, DR election, PIM join/prune messages,
   join suppression, and prune override.  It was written by Bharat Joshi
   <bharat_joshi@infosys.com> and is used in commercial products.
   Bharat is not an author of the protocol specification.

2.4.4  Procket Networks

   An implementation was written from scratch at Procket Networks by
   Dino Farinacci <dino@cisco.com>.  This implementation is now owned by
   Cisco Systems, Inc. Dino is not an author of the new protocol
   specification.

2.5  Evidence of Testing

2.5.1  Cisco

   The Cisco implementation has undergone extensive laboratory testing



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   as well as testing in production deployments.  It is found to
   interoperate with implementations of earlier versions of the PIM
   Sparse-Mode protocol specification.

2.5.2  XORP

   The XORP PIM-SM implementation has been thoughtfully tested
   internally by the XORP project.  The emphasis during testing has been
   on correctness.  In a typical setup, a PIM-SM router's behavior is
   tested by connecting it to external packet generators and observers.
   The packet generators are used to generate messages such as IGMP and
   PIM-SM control packets, and multicast data packets.  The packet
   observers are used to observe the PIM-SM control packets generated by
   the PIM-SM router under test, and to observe the data packets that
   may be forwarded by that router.  In addition, the router's command-
   line interface has been used to observe its internal state during
   some of the tests.

   The test scenarios have been designed to closely follow the protocol
   specification (e.g., a separate test has been created for each event
   in the various protocol state machines, etc).  All test scenarios are
   described in detail in the XORP PIM-SM Test Suite [XORP-TEST].

   The major tested features are:

   1.  Multicast data forwarding.

   2.  PIM Hello messages exchange, PIM router neighbor discovery,
       option exchange, and DR election.

   3.  PIM Register messages transmission and reception, PIM Register
       state machine, multicast data packets encapsulation and
       decapsulation.

   4.  Transmission and reception of PIM Join/Prune messages, upstream
       and downstream protocol state machines.  The tests consider the
       following state: (*,*,RP), (*,G), (S,G) and (S,G,rpt).

   5.  Transmission and reception of PIM Assert messages and the per-
       interface (*,G) and (S,G) Assert state machines.

   6.  PIM Bootstrap mechanism: transmission, reception and forwarding
       of PIM Bootstrap messages, transmission and reception of PIM
       Cand-RP-Adv messages, candidate and non-candidate BSR state
       machines, creating the RP-Set at the BSR, receiving and using the
       RP-Set, semantic fragmentation of BSMs.

   In the final tests, the tested router behaved as specified in the



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   PIM-SM protocol specification.  All issues found in the protocol
   specification itself have been corrected in earlier versions of the
   Internet Draft.

2.5.3  Procket Networks

   The Procket Networks implementation was deployed in many research and
   service provider networks and showed interoperability with new and
   old Cisco Systems implementations as well as Juniper Networks
   implementations.

2.6  Suitability

   PIM Sparse-Mode is a protocol for efficiently routing multicast
   groups that may span wide-area (and inter-domain) Internets.  PIM
   uses the underlying unicast routing to provide reverse-path
   information for multicast tree building but it is not dependent on
   any particular unicast routing protocol.

2.7  Authentication Mechanisms

   PIM specifies the use of the IP security (IPsec) authentication
   header (AH) to provide data integrity protection and groupwise data
   origin authentication of protocol messages.  The specific AH
   authentication algorithm and parameters, including the choice of
   authentication algorithm and the choice of key, are configured by the
   network administrator.  The threats associated with receiving forged
   PIM messages are outlined in the security considerations section of
   the protocol specification.

3.  IANA Considerations

   This document makes no request of IANA.

4.  Security Considerations

   No considerations apply to a requirements analysis about a routing
   protocol, only to a specification for that routing protocol.

5.  Acknowledgments

   Pavlin Radoslavov provided text for the section on XORP testing.
   Dino Farinacci provided text for the Procket Networks testing.

6.  References






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6.1  Normative References

   [I-D.ietf-pim-sm-v2-new]
              Fenner, B., Handley, M., Holbrook, H., and I. Kouvelas,
              "Protocol Independent Multicast - Sparse Mode PIM-SM):
              Protocol Specification  (Revised)",
              draft-ietf-pim-sm-v2-new-11 (work in progress),
              October 2004.

   [RFC2934]  McCloghrie, K., Farinacci, D., Thaler, D., and B. Fenner,
              "Protocol Independent Multicast MIB for IPv4", RFC 2934,
              October 2000.

6.2  Informative References

   [RFC1264]  Hinden, R., "Internet Engineering Task Force Internet
              Routing Protocol Standardization Criteria", RFC 1264,
              October 1991.

   [RFC2117]  Estrin, D., Farinacci, D., Helmy, A., Thaler, D., Deering,
              S., Handley, M., Jacobson, V., Liu, C., Sharma, P., and L.
              Wei, "Protocol Independent Multicast-Sparse Mode (PIM-SM):
              Protocol Specification", RFC 2117, June 1997.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2362]  Estrin, D., Farinacci, D., Helmy, A., Thaler, D., Deering,
              S., Handley, M., and V. Jacobson, "Protocol Independent
              Multicast-Sparse Mode (PIM-SM): Protocol Specification",
              RFC 2362, June 1998.

   [XORP]     "XORP Project", <http://www.xorp.org>.

   [XORP-TEST]
              "XORP PIM-SM Test Suite", <http://www.xorp.org/releases/
              current/docs/pim_test-suite/pim_testsuite.pdf>.














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Author's Address

   Tom Pusateri
   Juniper Networks
   1194 North Mathilda Avenue
   Sunnyvale, CA  94089
   USA

   Phone: +1 408 745 2000
   Email: pusateri@juniper.net









































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