HP 5920 Series Troubleshooting Guide

32
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 send 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.
HP recommends that you 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 HP Support.
Related commands
This section lists the commands that you might use for troubleshooting ports.
Command Descri
p
tion
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.

HP 5920 Series Specifications

General

Brand	HP
Model	5920 Series
Category	Switch
Language	English