With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpOspfExtLsdbSequence
Virtual Router Ip Ospf Ext Lsdb Sequence
A signed 32-bit integer, used to detect old and duplicate LSAs. The space of sequence numbers is linearly ordered. The larger the sequence number, the more recent the advertisement.
Back to Nortel-Magellan-Passport-IpMIB MIB page.
IPHost Network monitor allows you to monitor vrIpOspfExtLsdbSequence 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.