With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dot1agCfmLtrChassisIdSubtype
dot1ag Cfm Ltr Chassis Id Subtype
This object specifies the format of the Chassis ID returned in the Sender ID TLV of the LTR, if any. This value is meaningless if the dot1agCfmLtrChassisId has a length of 0.
Back to IEEE8021-CFM-MIB MIB page.
IPHost Network monitor allows you to monitor dot1agCfmLtrChassisIdSubtype on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.