With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrPpIpxPNetSentryPInComingFilter
Virtual Router Passport Ipx P Net Sentry P In Coming Filter
This attribute specifies the name of the NetSentry filter applied to incoming IPX packets on this port.
Back to Nortel-Magellan-Passport-IpxMIB MIB page.
IPHost Network monitor allows you to monitor vrPpIpxPNetSentryPInComingFilter 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.