31
b.
If the port is configured with the spanning tree feature, use the
display stp brief
command
to verify that the port is not in the discarding state.
If the port is set to the discarding state by the spanning tree feature, examine and modify the
spanning tree feature configurations to resolve the problem.
As a best practice, configure the port as an edge port or disable the spanning tree feature on
the port if it is directly connected to a terminal.
c.
If the port is in an aggregation group, use the
display link-aggregation summary
command to verify that the status of the port is
Selected
.
If the status of the port is
Unselected
, the port cannot send or receive data packets.
Determine the reasons why the port becomes
Unselected
, for example, the attribute
configurations of the port are different from the reference port. Modify the attribute
configurations of the port to make the port become
Selected
.
4.
Verify that the link medium connected to the port is operating correctly.
Plug the link medium into a new port that is operating correctly. If the new port cannot send
packets, replace the link medium.
5.
Verify that the port is operating correctly:
{
If the port is a copper port, connect the port directly to a PC.
{
If the port is a fiber port, replace the transceiver module in the port.
If the port can send packets, troubleshoot the remaining possible points of failure on the
transmission path. The troubleshooting process is beyond the scope of this document.
6.
If the problem persists, contact H3C Support.
Related commands
This section lists the commands that you might use for troubleshooting ports.
Command Description
display diagnostic-information
Displays or saves running status data for multiple feature
modules.
display interface
Displays Ethernet interface information.
display interface brief
Displays brief interface information.
display link-aggregation summary
Displays the summary information for all aggregation groups.
display logbuffer
Displays the state of the log buffer and the log information in
the log buffer.
display stp brief
Displays brief spanning tree status and statistics.
display transceiver alarm interface
Displays the current transceiver module alarms.
display transceiver diagnosis
Displays the present measured values of the digital diagnosis
parameters for transceiver modules.
display transceiver interface
Displays the key parameters of transceiver modules.
