With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dot1agCfmMepUnexpLtrIn
dot1ag Cfm Mep Unexp Ltr In
The total number of unexpected LTRs received (20.39.1). REFERENCE 12.14.7.1.3:ac 20.39.1
Back to IEEE8021-CFM-MIB MIB page.
IPHost Network monitor allows you to monitor dot1agCfmMepUnexpLtrIn on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.