Discussion
Your switch has a port status LED that is alternating between green and amber. What could this indicate?
Answer: A
Correct answer: The port is experiencing errors.
An alternating green and amber LED signals errors on the link - collisions, CRC failures or a duplex mismatch. Solid green is a good link, amber alone usually means the port is blocked by spanning tree, and an unlit LED means no link or an administratively shut port. The counters in show interface will say which error is accumulating.
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