Wednesday, July 9, 2008

Fix Cisco Switch Ports

Issue: One or more ports are not working on your Cisco switch. Ports can get into a disabled state if you plug in a bad cable or something of that sort. Here is how you find the disabled ports and re-enable them:

Quick: use the command sho inter stat err-disabled to find and config t, inter fast PORT#, shutdown, no shutdown.


1. Logon to the switch
2. >enable (type enable at and the password to gain full access to the switch)
3. >show interfaces status err-disabled (This will show any ports that are disabled)
4. >config t (get into configuration mode)
5. >interface FastEthernet 0/1 (Get to configuration for one of the bad ports. Here you need to put one of the actual disabled port numbers that you found in step 3)
6. >shutdown (This turns that port off)
7. >no shutdown (This turns that port back on)
8. >exit (or CNTR-z to exit out of config-if mode)

Repeat steps 5 through 8 for each port that is disabled.
Exit out

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