With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
msdpSACacheRPFPeer
msdp SA Cache RPF Peer
1.3.6.1.3.92.1.1.6.1.5
The peer from which an SA message corresponding to this cache entry would be accepted (i.e. the RPF peer for msdpSACacheOriginRP). This may be different than msdpSACachePeerLearnedFrom if this entry was created by an MSDP SA-Response. This address must correspond to the msdpPeerRemoteAddress value for a row in the MSDP Peer Table.
Back to DRAFT-MSDP-MIB MIB page.
IPHost Network monitor allows you to monitor msdpSACacheRPFPeer on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.