With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrPpSrclDesignatedRoot
Virtual Router Passport Srcl Designated Root
This attribute specifies the bridge identifier of the bridge recorded as the root bridge, in the configuration BPDUs sent out by the designated bridge on the segment to which the port is attached.
Back to Nortel-Magellan-Passport-BridgeMIB MIB page.
IPHost Network monitor allows you to monitor vrPpSrclDesignatedRoot 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.