26
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.
b.
If configuration errors exist, modify the port configurations. If the number of outgoing packets
in the output from the
display interface
command is accumulating, you can determine that the
port can send packets.
c.
If the port fails to send packets, use the
shutdown
command and then the
undo shutdown
command to re-enable the port. If the number of outgoing packets in the output from the
display
interface
command is accumulating, you can determine that the port can send packets.
d.
If the port is configured with STP, use the
display stp brief
command to verify that the port is not
in the discarding state.
e.
If a port is set to the discarding state by STP, examine and modify the STP-related
configurations to resolve the problem.
H3C recommends that you configure the port as an edge port or disable STP on the port if it is
directly connected to a terminal.
f.
If the port is assigned to an aggregation group, use the
display link-aggregation summary
command to verify that the status of the port is
Selected
.
g.
If the status of the port is
Unselected
, the port cannot send or receive data packets.
h.
Determine 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
.
3.
Verify that the port and the link medium are correct:
a.
Plug the link medium into another port that is operating correctly, and determine whether the
same problem occurs.
−
If the port is a copper port, replace the peer device with a PC.
−
If the port is a fiber port, replace the transceiver module.
b.
If the problem still occurs, determine whether intermediate links and devices are operating
correctly (for example, optical converters, cable terminal racks, and transmission devices).
4.
If you determine that the configurations, the peer port, and the link are correct but the problem
persists, perform the following tasks:
{
Use the
display diagnostic-information
command to collect the diagnostic information.
{
Contact H3C Support.
<H3C> display diagnostic-information
Save or display diagnostic information (Y=save, N=display)? [Y/N]:Y
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.
