port err-disabled

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Jul 19th, 2009
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i have problem with Switch 2960 TT . There is Port err-disabled and Link is down.when we do shut no shut just one up and again link is down . and port indicate err-disabled.??/ so what i will do ...>?

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pompeychimes Sun, 07/19/2009 - 07:20
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What's connected to the switch port?

Giuseppe Larosa Sun, 07/19/2009 - 08:50
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Hello Jayesh,

first of all you need to understand why the port is placed in error-disable state.

You can use sh log to see last events related to that port or simply

term mon

int type x/y


no shut

you should see the reason.

among possible reasons:

spanning-tree bpduguard

port security

receiving not correct STP information on a trunk port

Hope to help


Leo Laohoo Sun, 07/19/2009 - 18:33
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Giuseppe's right. It is worthwhile to know WHY the port goes into repeatitive error-disable. Use the command sh intertace status err will give you a brief explanation.

Hope this helps.


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