With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdot3OamUnsupportedCodesTx
Cisco DOT3 Oam Unsupported Codes Tx
1.3.6.1.4.1.9.10.136.1.4.1.15
A count of the number of OAMPDUs transmitted on this interface with an unsupported op-code. Discontinuities of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of the ifCounterDiscontinuityTime. REFERENCE "[802.3ah], 30.3.6.1.18.
Back to CISCO-DOT3-OAM-MIB MIB page.
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