With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpBgpExportNetLength
Virtual Router Ip Bgp Export Net Length
This attribute specifies the length of the network prefix.
Back to Nortel-Magellan-Passport-BgpMIB MIB page.
IPHost Network monitor allows you to monitor vrIpBgpExportNetLength 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.