Peers; Msdp Configuration Considerations - Avaya 8800 Planning And Engineering, Network Design

Figure 102: MSDP operation between peers
MSDP routers cache SA messages by default. The cache reduces join latency for new receivers
and reduces storms by advertising from the cache at a period of no more than twice for the SA
advertisement timer interval and not less than once for the SA advertisement period. The SA
advertisement period is 60 seconds.

Peers

Configure neighboring routers as the MSDP peers of the local router to explicitly define the peer
relationships. You must configure at least one peer. MSDP typically runs on the same router as the
PIM-SM RP. In a peering relationship, the MSDP peer with the highest IP address listens for new
TCP connections on port 639. The other side of the peer relationship makes an active connection to
this port.
Default peers
Configure a default MSDP peer when the switch is not in a BGP-peering relationship with an MSDP
peer. If you configure a default peer, the switch accepts all SA messages from that peer.

MSDP configuration considerations

Avaya recommends that you configure MSDP on RPs for sources that send to global groups to
announce to the Internet.
You cannot configure the MSDP feature for use with the Virtual Router Forwarding (VRF) feature.
You can configure MSDP for the base router only.
June 2016 Planning and Engineering — Network Design
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