With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciiCircLANDesISChanges
Cisco IS-IS Circ LAN Des IS Changes
1.3.6.1.4.1.9.10.118.1.5.2.1.10
The number of times the Designated IS has changed on this circuit at this level. If the circuit is point to point, this count is zero.
Back to CISCO-IETF-ISIS-MIB MIB page.
IPHost Network monitor allows you to monitor ciiCircLANDesISChanges 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.