With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciiPduFieldLen
Cisco IS-IS Pdu Field Len
1.3.6.1.4.1.9.10.118.1.10.1.3
Holds the System ID length reported in PDU we received.
Back to CISCO-IETF-ISIS-MIB MIB page.
IPHost Network monitor allows you to monitor ciiPduFieldLen 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.