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Copper port remains in down state
Symptom
A 10/100/1000Base-T GE copper port or 1/10GBase-T 10-GE copper port remains in down state.
Troubleshooting flowchart
Figure 12 Troubleshooting copper port's failure to come up
Solution
To resolve the problem:
1. Verify that the speed and duplex mode of the local port match the speed and duplex mode of the
peer port:
a. Execute the display interface brief command to examine whether the speed and duplex mode
of the port match the speed and duplex mode of the peer port.
The switch does not support the half-duplex mode. If the switch and its peer operate in
half-duplex mode after negotiation, the ports on the switch will not come up.
Speed/duplex match
on local and peer port?
No
Yes
No
Yes
No
Yes
Yes
No
No
Yes
Yes
No
No Yes
Yes
No
Contact the support
Copper port remains in down
state
End
Replace peer port Resolved?
Network cable correct?
Local port
operating correctly?
Replace local port
Replace network
cable
Configure matching
speed/duplex
Resolved?
Resolved?
Resolved?
Peer port
operating correctly?
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