With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdmsHaClusterNumTotalDmms
Cisco Digital Media Management System Ha Cluster Number Total Dmms
1.3.6.1.4.1.9.9.655.1.10.2.1.1
This object indicates the total number of DMM nodes in this cluster.
Back to CISCO-DIGITAL-MEDIA-SYSTEMS-MIB. MIB page.
IPHost Network monitor allows you to monitor cdmsHaClusterNumTotalDmms on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.