
Troubleshooting a Data Link Layer Problem
117379-A Rev. A 5-29
Troubleshooting Other Data Link Layer Protocols
This section assumes that you have isolated a problem to a data link connection. If
not, refer to Chapter 2 to determine if these instructions apply to your problem.
Troubleshoot a data link layer protocol as follows:
1. Use the Events Manager or the Technician Interface to filter the log to
display messages of all severity levels for the media in question.
The Technician Interface command is as follows:
log -fftwid -e
<ENTITY>
-s
<slot_no.>
When specifying
<ENTITY>
, use uppercase letters. See Event Messages for
Routers for a list of the entities.
Example
If you are filtering events from the HSSI entity running in slots 3 and 4, enter
the following command:
log -fftwid -eHSSI -s3 -s4
2.
Check the state of the media.
3. Check the values of the following statistics twice and compare them to
determine whether the media is currently receiving/transmitting frames
and generating errors:
• Reception and transmission statistics
If the reception or transmission statistics do not change, do the following:
-- Check the reception and transmission statistics of the other ports in
the same slot.
-- Try disabling and enabling the port, and check the log messages to
determine why the connection will not activate.
• Error statistics
4. Look at the forwarding tables of each router in the path to determine the
following:
• Whether entries exist
• Whether the next-hop addresses are in the right direction
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