Cisco IOS switches support several commands that can be used to troubleshoot Layer 1 or at least, suspected, Layer 1 issues. However, in addition to being familiar with the software command suite, it is also important to have a solid understanding of physical indicators, i.e. LEDs, which can be used to link status or can indicate an error condition.
Troubleshooting Link Status Using Light Emitting Diodes (LEDs)
If you have physical access to the switch or switches, LEDs can be a useful troubleshooting tool. Different Cisco Catalyst switches provide different LED capabilities. Understanding the meaning of the . . .
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