With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpOspfAreaAreaLsaCksumSum
Virtual Router Ip Ospf Area Area Lsa Cksum Sum
The 32-bit unsigned sum of the link-state advertisement's LS checksums contained in this area's link-state database. This sum excludes external (LS type 5) link-state advertisements. The sum can be used to determine if there has been a change in a router's link state database, and to compare the link-state database of two routers.
Back to Nortel-Magellan-Passport-IpMIB MIB page.
IPHost Network monitor allows you to monitor vrIpOspfAreaAreaLsaCksumSum on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Nortel switches right now.