
Troubleshooting Routers
5-6
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 as follows:
1. Filter the log to display only messages from the CSMACD entity running
on the slots experiencing the problem. The Technician Interface
command is
log -fftwid -eCSMACD -s
<slot_no.>
Example
If you are filtering events from Slots 3 and 4, you enter
log -fftwid -eCSMACD -s3 -s4
2.
If only a single port on the slot is reporting errors, try switching out the
transceiver/hub port the router is connected to, or the actual cable that
connects the router to the transceiver cable 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 and should either replace the link
module or call the Bay Networks Technical Response Center.
3. Use the Technician Interface to look at the values of the following
attributes in the wfCSMACDEntry object. Or, use the wfLine➔
wfCSMACDTable Quick Get path to access them.
• wfCSMACDDelete
This shows whether you configured CSMACD (1), or whether you did not
(2).
• wfCSMACDEnable
This shows whether CSMACD is enabled (1) or disabled (2) on the line.
• wfCSMACDState
This shows whether CSMACD is up (1), down (2), initializing (3), or not
present (4).
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