With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
msdpRequestsGroupMask
msdp Requests Group Mask
1.3.6.1.3.92.1.1.4.1.2
The mask that, when combined with the group address in this entry, represents the group range for which this peer will service MSDP SA Requests.
Back to DRAFT-MSDP-MIB MIB page.
IPHost Network monitor allows you to monitor msdpRequestsGroupMask on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.