With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciiSummAddrEntry
Cisco IS-IS Summ Address Entry
1.3.6.1.4.1.9.10.118.1.1.5.1
Each entry contains one IP summary address.
Back to CISCO-IETF-ISIS-MIB MIB page.
IPHost Network monitor allows you to monitor ciiSummAddrEntry 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.