楼主参考一下下面表格 Table 11. Meaning of Switch LED Colors in Different Modes
Port LED Color
STAT (port status)
No link, or port was administratively shut down.
Link present, no activity.
Activity. Port is sending or receiving data.
[Link fault. Error frames can affect connectivity, and errors such as excessive collisions, CRC errors, and alignment and jabber errors are monitored for a link-fault indication.
Port is blocked by Spanning Tree Protocol (STP) and is not forwarding data.
After a port is reconfigured, the port LED can be amber for up to 30 seconds as STP checks the switch for possible loops.
Network Module Link Status
Link is off.
Link is on; no activity.
Activity on a link; no faults.
The LED will blink green even when there is very little control traffic.
Link is off due to a fault or because it has exceeded a limit set in the switch software.
Link faults occur when noncompliant cabling is connected to an SFP/SFP+/SFP28 port. Use only standard-compliant cabling to connect to Cisco SFP/SFP+/SFP28 ports. You must remove from the network any cable or device that causes a link fault.