H3C S6800 Series Troubleshooting Manual

Also see for S6800 Series: Manual Installation guide Command reference MCE Command Reference Command reference

H3C S6800 Series Troubleshooting Manual Manual pdf 36 page image

283. 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 VLANconfigurations of the ports at both ends of the link. If configuration errors exist, modify theport configurations. If the port fails to receive packets, use the shutdown command andthen 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 commandto 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 thespanning tree feature configurations to resolve the problem.As a best practice, configure the port as an edge port or disable the spanning tree feature onthe port if it is directly connected to a terminal.c. If the port is in an aggregation group, use the display link-aggregation summarycommand 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 attributeconfigurations of the port are different from the reference port. Modify the attributeconfigurations 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 receivepackets, 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 thetransmission path. The troubleshooting process is beyond the scope of this document.6. If the problem persists, contact H3C Support.Failure to send packetsSymptomA port is up, but it cannot send packets.