RFC 3446 (rfc3446) - Page 1 of 7


Anycast Rendevous Point (RP) mechanism using Protocol Independent Multicast (PIM) and Multicast Source Discovery Protocol (MSDP)



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Network Working Group                                             D. Kim
Request for Comments: 3446                                         Verio
Category: Informational                                         D. Meyer
                                                               H. Kilmer
                                                            D. Farinacci
                                                        Procket Networks
                                                            January 2003


             Anycast Rendevous Point (RP) mechanism using
                 Protocol Independent Multicast (PIM)
             and Multicast Source Discovery Protocol (MSDP)

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 (2003).  All Rights Reserved.

Abstract

   This document describes a mechanism to allow for an arbitrary number
   of Rendevous Points (RPs) per group in a single shared-tree Protocol
   Independent Multicast-Sparse Mode (PIM-SM) domain.

1. Introduction

   PIM-SM, as defined in RFC 2362, allows for only a single active RP
   per group, and as such the decision of optimal RP placement can
   become problematic for a multi-regional network deploying PIM-SM.

   Anycast RP relaxes an important constraint in PIM-SM, namely, that
   there can be only one group to RP mapping can be active at any time.
   The single mapping property has several implications, including
   traffic concentration, lack of scalable register decapsulation (when
   using the shared tree), slow convergence when an active RP fails,
   possible sub-optimal forwarding of multicast packets, and distant RP
   dependencies.  These properties of PIM-SM have been demonstrated in
   native continental or inter-continental scale multicast deployments.
   As a result, it is clear that ISP backbones require a mechanism that
   allows definition of multiple active RPs per group in a single PIM-SM
   domain.  Further, any such mechanism should also address the issues
   addressed above.




Kim, et al.                  Informational


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