With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cpwCTDMPerfCurrentMalformedPkt
Cisco Pseudo Wire CTDM Performance Current Malformed Packet
1.3.6.1.4.1.9.10.131.1.5.1.5
Number of packets detected with unexpected size, or bad headers' stack
Back to CISCO-IETF-PW-TDM-MIB MIB page.
IPHost Network monitor allows you to monitor cpwCTDMPerfCurrentMalformedPkt 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.