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Switchport going into err-disabled. Reason 'link-flap'

Posted on 2012-03-19
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Last Modified: 2012-06-27
Dear experts

I have a specific switchport which goes into err-disabled mode around once a week and i'm trying to uncover why it is doing so.

show run
show port-security
Doing a show interfaces status err-disabled says that the reason is 'link-flap,' which i am not familiar with, i am hoping someone could shed some light on.

BTW end device is a windows pc.
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Question by:Bladey001
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4 Comments
 
LVL 7

Assisted Solution

by:PaulNSW
PaulNSW earned 2000 total points
ID: 37736922
link-flap usually means the network connection is being repeatedly disconnected and reconnected.

You can set thresholds for this and auto recovery for this type of error.

I would check the networking cable and sockets between the PC and switch to see if there are any loose connections.
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Author Comment

by:Bladey001
ID: 37737049
How do i setup the thresholds and auto recovery?
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LVL 7

Accepted Solution

by:
PaulNSW earned 2000 total points
ID: 37737112
you must be in configure mode to enable recovery.

use:

errdisable recovery cause link-flap
errdisable recovery interval timer_interval_in_seconds

you can check the status using
show errdisable recovery

dont forget to "copy run start"

for further information, look at http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00806cd87b.shtml
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Author Closing Comment

by:Bladey001
ID: 37737422
Thank you!
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