
Troubleshooting a Data Link Layer Problem
117379-A Rev. A 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:
1. 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
2.
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 Bay Networks Technical Solutions Center.
3. 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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