With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ospfv3ExtLsaCount
ospfv3 Ext Lsa Count
1.3.6.1.3.102.1.1.10
The number of External(LS type 0x4005) in the link- state database
Back to OSPFV3-MIB MIB page.
IPHost Network monitor allows you to monitor ospfv3ExtLsaCount on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.