Failure To Send Packets; Symptom - H3C S6800 Series Troubleshooting Manual

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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.

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.

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.

If the problem persists, contact H3C Support.

Failure to send packets

A port is up, but it cannot send packets.

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