With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciiIPRADestPrefixLen
Cisco IS-IS IPRA Destination Prefix Len
1.3.6.1.4.1.9.10.118.1.8.1.1.3
The length of the IP Netmask for Reachability Address. This object follows the ManualOrAutomatic behavior.
Back to CISCO-IETF-ISIS-MIB MIB page.
IPHost Network monitor allows you to monitor ciiIPRADestPrefixLen on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.