With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrPpSrsgBridgeNum
Virtual Router Passport Srsg Bridge Num
This attribute specifies the value that is used to identify this bridge when more than one bridge is used to span the same two LAN segments.
Back to Nortel-Magellan-Passport-BridgeMIB MIB page.
IPHost Network monitor allows you to monitor vrPpSrsgBridgeNum 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 multiplexers right now.