With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrPpSrtBpApeInFrames
Virtual Router Passport Srt Bridge Port Ape In Frames
This attribute specifies the number of All Path Explore frames received on this bridge port. The All Path Explore frames are forwarded to all SourceRouteBridge ports assigned to this bridge regardless of the port's portStpStates. This counter will wrap to zero when it exceeds its maximum.
Back to Nortel-Magellan-Passport-BridgeMIB MIB page.
IPHost Network monitor allows you to monitor vrPpSrtBpApeInFrames 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.