With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cpimExtBidirDFIfIndex
cpim Ext Bidir DF If Index
1.3.6.1.4.1.9.10.120.1.1.6.1.1
The value of ifIndex for the interface for which the DF state is being maintained.
Back to CISCO-IETF-PIM-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cpimExtBidirDFIfIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.