Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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3.10 Communication failures in the neighboring device management
functionality
3.10.1 Neighboring device information cannot be obtained by the LLDP
functionality
If neighboring device information cannot be obtained correctly by using the LLDP
functionality, isolate the cause of the problem according to the failure analysis method
described in the following table.
Table 3-33 Failure analysis method when the LLDP functionality is used
No. Items to check and
commands
Action
1 Execute the show lldp
operation command and check
the operating status of the
LLDP functionality.
If Enabled is displayed for Status, go to No. 2.
If the response message LLDP is not configured is displayed, the
LLDP functionality has stopped. Enable the LLDP functionality.
2 Execute the show lldp
operation command and check
the port information.
If information for the port to which the neighboring device is connected
is displayed, go to No. 3.
If information for the port to which the neighboring device is connected
is not displayed, the LLDP functionality is disabled for the target port.
Enable the LLDP functionality for the target port.
3 Execute the show lldp
statistics operation
command and check the
statistics for the port to which
the neighboring device is
connected.
If the Tx count has been incremented but the Rx count has not, check
No. 1 through No. 3 on the neighboring device. If the Tx count has also
been incremented on the neighboring device, the connection between
the devices might be incorrect. Check the connection.
If the Discard count has been incremented, check the connection
between the devices.
For other cases, go to No. 4.
4 Execute the show lldp
operation command and check
the port status in the
information for the port to which
the neighboring device is
connected.
If Up is displayed for Link, go to No. 5.
If Down is displayed for Link, check the line status. For details about
the check procedure, 3.4 Network interface communication failures.