With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrPpTbseStpTypeOper
Virtual Router Passport Tbse Stp Type Operational
This attribute specifies the type of spanning tree protocol the port is participating in. A bridge port could participate in either the ieee8021 spanning tree protocol or the dec spanning tree protocol.
Back to Nortel-Magellan-Passport-BridgeMIB MIB page.
IPHost Network monitor allows you to monitor vrPpTbseStpTypeOper 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 modems right now.