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2.
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.
b.
If configuration errors exist, modify the port configurations. If the number of incoming
packets in the output from the
display interface
command is accumulating, you can
determine that the port can receive packets.
c.
If the port fails to receive packets, use the
shutdown
command and then the
undo
shutdown
command to re-enable the port. If the number of incoming packets in the output
from the
display interface
command is accumulating, you can determine that the port can
receive 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 issue.
As a best practice, 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 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
.
3.
Verify that the port and the link medium are operating correctly:
a.
Plug the link medium into another port that is operating correctly, and determine whether the
same problem occurs.
b.
If the problem still occurs, verify that the following items are operating correctly:
−
Intermediate links and devices, including optical-to-electrical converters, cable terminal
racks, and transmission devices.
−
Transmission medium, including network cables, optical fibers, and transceiver
modules.
c.
Examine the port:
−
If the port is a copper port, directly connect the port to a PC.
−
If the port is a fiber port, replace the transceiver module plugged into the port.
4.
If the issue persists, contact H3C Support.
Failure to send packets
Symptom
A port is up, but it cannot send packets.
