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Anycast Rendevous Point (RP) mechanism using Protocol Independent Multicast (PIM) and Multicast Source Discovery Protocol (MSDP) (RFC3446)

IP.com Disclosure Number: IPCOM000011188D
Original Publication Date: 2003-Jan-01
Included in the Prior Art Database: 2003-Feb-13
Document File: 8 page(s) / 15K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Kim: AUTHOR [+4]

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.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 19% of the total text.

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                      [Page 1]

RFC 3446        Anycast RP mechanism using PIM and MSDP     January 2003

   The mechanism described here is intended to address the need for

   better fail-over (convergence time) and sharing of the register

   decapsulation load (again, when using the shared-tree) among RPs in a

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