Solution - HP 5920 series Troubleshooting Manual

Solution

To resolve the problem:
1. Verify that the ports at both ends are up.
2. Examine the packet statistics of the port:
a. (Optional.) Use the reset counter interface command to clear the packet statistics of the port.
This command resets all packet counters to 0, so that you can view the statistics changes more
clearly.
b. Use the display interface command to verify that the number of incoming packets is
accumulating.
c. Verify that the number of error frames is not accumulating.
If the number of error frames is accumulating, remove errors, see
CRC errors) on a
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.
HP recommends that you configure the port as an edge port or disable STP 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.
port."
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"Error frames (for example,