With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gvcIfLcnVcWrTriggers
General Vc Interface Logical Channel Number Vc Wr Triggers
This attribute displays the number of times the Vc stays within the W-R region. The W-R region is a value used to determined the timing of credit transmission. Should the current window size be beneath this value, the credits will be transmitted immediately. Otherwise, they will be transmitted later with actual data. The wrTriggers statistic is therefore used to analyze the flow control and credit mechanism.
Back to Nortel-Magellan-Passport-GeneralVcInterfaceMIB MIB page.
IPHost Network monitor allows you to monitor gvcIfLcnVcWrTriggers 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.