Copper Port Remains In Down State; Symptom; Troubleshooting Flowchart; Solution - H3C S5560-EI Series Troubleshooting Manual

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
Copper port remains in down
Speed/duplex match
on local and peer port?
Network cable correct?
operating correctly?
operating correctly?
Contact the support

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.
state
Yes
Yes
Local port
Yes
Peer port
Yes
No
Configure matching
speed/duplex
No
Replace network
cable
No
Replace local port
No
Replace peer port
28
Yes
Resolved?
No
Yes
Resolved?
No
Yes
Resolved?
No
Yes
Resolved?
No
End