With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpTunnelSepSourceAddress
Virtual Router Ip Tunnel Sep Source Address
This attribute specifies the IP address of the local end of the tunnel. The source address must be an address in the shared domain, and it must equal to an interface address on its own Virtual Router (under Vr/ Pp/ IpPort LogicalIf/). However, it must not be the interface address of the linked protocol port's IpPort.
Back to Nortel-Magellan-Passport-IpMIB MIB page.
IPHost Network monitor allows you to monitor vrIpTunnelSepSourceAddress 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 secure routers right now.