With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cObmiM500LastActiveBus
Cisco Obmi M500 Last Active Bus
1.3.6.1.4.1.9.9.698.1.5.1.3
This object indicates which bus was last active: a : m500 bus A was last active b : m500 bus B was last active
Back to CISCO-OBMI-MIB MIB page.
IPHost Network monitor allows you to monitor cObmiM500LastActiveBus on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.