With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dot1agCfmLtrChassisId
dot1ag Cfm Ltr Chassis Id
The Chassis ID returned in the Sender ID TLV of the LTR, if any. The format of this object is determined by the value of the dot1agCfmLtrChassisIdSubtype object. REFERENCE 802.1ag clauses 12.14.7.5.3:i and 21.5.3.3
Back to IEEE8021-CFM-MIB MIB page.
IPHost Network monitor allows you to monitor dot1agCfmLtrChassisId 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.