Inter-AS Multicast Using Static RPF Peers

As mentioned in RPF Check Rules for SA Messages, if an SA message is sent by an RPF peer, the message is accepted and forwarded to other MSDP peers. If you specify MSDP peers as static RPF peers to one another, these RPF peers accept SA messages without performing RPF checks.

Incorrect static RPF configurations may lead to looping of SA messages. Exercise caution when you configure static RPF peers. Static RPF peer relationships are usually set up among MSDP peers in multiple ASs.

Figure 1 Inter-AS multicast using static RPF peers