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3.
Verify that the port configurations do not affect packet receiving:
a.
Use the
display interface brief
command to verify that the port configurations are correct.
The port configurations include the duplex mode, speed, port type, and VLAN
configurations of the ports at both ends of the link. If configuration errors exist, modify the
port configurations. If the port fails to receive packets, use the
shutdown
command and
then the
undo shutdown
command to re-enable the port.
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 receive
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 receive 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.
Failure to send packets
Symptom
A port is up, but it cannot send packets.
