With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ospfExtLsdbLsid
ospf Ext Lsdb Lsid
1.3.6.1.2.1.14.12.1.2
The Link State ID is an LS Type Specific field containing either a Router ID or an IP address; it identifies the piece of the routing domain that is being described by the advertisement.
Back to OSPF-MIB MIB page.
IPHost Network monitor allows you to monitor ospfExtLsdbLsid on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.