With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpOutDiscards
Virtual Router Ip Out Discards
The number of outbound datagrams that were discarded due to the lack of buffers. This sum also includes datagrams counted in forwDatagrams if any such packets met the discard criterion. outDiscards wraps to zero if reaches its maximum defined value.
Back to Nortel-Magellan-Passport-IpMIB MIB page.
IPHost Network monitor allows you to monitor vrIpOutDiscards 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 speech servers right now.