With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrPpSrsgApeInFrames
Virtual Router Passport Srsg 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 vrPpSrsgApeInFrames 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.