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Chapter 1

Auto-RP

956651

IP Multicast Overview

Multicast Forwarding

Auto-RP automates the distribution of group-to-RP mappings in a network supporting PIM-SM. Auto-RP supports the use of multiple RPs within a network to serve different group ranges and allows configurations of redundant RPs for reliability purposes. Auto-RP allows only one RP to be active at once. Auto-RP can be used as the distribution mechanism to advertise the Anycast RP addresses previously discussed The automatic distribution of group-to-RP mappings simplifies configuration and guarantees consistency.

The Auto-RP mechanism operates using two basic components, the candidate RPs and the RP mapping agents.

Candidate RPs advertise their willingness to be an RP via “RP-announcement” messages. These messages are periodically sent to a reserved well-known group 224.0.1.39 (CISCO-RP-ANNOUNCE).

RP mapping agents join group 224.0.1.39 and map the RPs to the associated groups. The RP mapping agents advertise the authoritative RP-mappings to another well-known group address 224.0.1.40 (CISCO-RP-DISCOVERY). All PIM routers join 224.0.1.40 and store the RP-mappings in their private cache.

Cisco AVVID Network Infrastructure IP Multicast Design

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