The Protocol Independent Multicast (PIM) Join Attribute Format

Abstract

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.

Population Count Extensions to Protocol Independent Multicast (PIM)

“…This document defines a new PIM Join Attribute type [RFC5384] for the Join/Prune message as well as a new Hello option. The mechanism is applicable to IPv4 and IPv6 multicast.…”

“…Note that it also needs to include the JoinAttribute Hello option as specified in [RFC5384]. The format of the Pop-Count-Supported Hello option is defined to be: In order to allow future updates of this specification that may include an option value, implementations of this document MUST accept and process this option even if the length is non-zero.…”

“…The mechanism to process a PIM Join Attribute is described in [RFC5384]. The format of the new attribute is specified in the following.…”

The Reverse Path Forwarding (RPF) Vector TLV

“…To allow the core router to participate in the construction of the tree, the Edge 2 router includes an "RPF (Reverse Path Forwarding) Vector" TLV in the PIM Join Attribute [RFC5384] of the PIM Join. In this example, the RPF Vector TLV will contain the IP address of Edge 1.…”

“…This document defines a new TLV in the PIM Join Attribute message [RFC5384]. It consists of a single Vector that identifies the exit point of the network.…”