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Troubleshooting a Data Link Layer Problem

308656-14.00 Rev 00

5-9

Troubleshooting an Ethernet Connection

This section assumes that you have isolated a problem to an Ethernet connection.

If not, refer to Chapter 2 to determine whether these instructions apply to your

problem.

Troubleshoot an Ethernet connection as follows:

Filter the log to display only messages from the CSMA/CD entity running

on the slots experiencing the problem.

The Technician Interface command is as follows:

log -fftwid -eCSMACD -s

<slot_no.>

Example

If you are filtering events from slots 3 and 4, enter the following command:

log -fftwid -eCSMACD -s3 -s4

If only one port on the slot is reporting errors, try switching out the

transceiver/hub port that the router is connected to, or the actual cable

that connects the router to the transceiver or twisted-pair connection.

If the problem persists, verify the configuration of the Ethernet port. Then,

switch the problem connection to another Ethernet port. If the errors stop

occurring, you may have a bad Ethernet port. You should either replace the

link module or call the Nortel Networks Technical Solutions Center.

Use the Technician Interface to look at the values of the following

attributes in the wfCSMACDEntry MIB object. Or, access them using the

Quick Get path wfLine

wfCSMACDTable.

• wfCSMACDDelete

This shows whether you configured CSMA/CD (1) or whether you did

not (2).

• wfCSMACDEnable

This shows whether CSMA/CD is enabled (1) or disabled (2) on the line.

• wfCSMACDState

This shows whether CSMA/CD is up (1), down (2), initializing (3), or not

present (4).

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Avaya Troubleshooting Routers Guía para resolver problemas Pagina 87