From: Tarun Pahuja (pahujat@gmail.com)
Date: Sat Dec 29 2007 - 18:26:29 ART
Phuc,
Following are some of the reasons a port can go into err-disable
state:
Duplex mismatch
Port channel misconfiguration
BPDU guard violation
UniDirectional Link Detection (UDLD) condition
Late-collision detection
Link-flap detection
Security violation
Port Aggregation Protocol (PAgP) flap
Layer 2 Tunneling Protocol (L2TP) guard
DHCP snooping rate-limit
Incorrect GBIC / Small Form-Factor Pluggable (SFP) module or cable
Address Resolution Protocol (ARP) inspection
Inline power
You can use the "errdisable recovery" command in the IOS To automatically
reset the port, but, if the problem is not resolved the port would go back
to the errdisable state.
HTH,
Tarun
On Dec 13, 2007 6:16 PM, Swan, Jay <jswan@sugf.com> wrote:
> Or you could do "sh int status err" and it'll even tell you why it's
> disabled, which is useful if you forgot to look at (or set up) your log.
>
> 3560A#sh int status err
>
> Port Name Status Reason
> Fa0/3 err-disabled psecure-violation
>
>
> Jay
> #17783
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Scott Morris
> Sent: Thursday, December 13, 2007 5:38 AM
> To: 'nhatphuc'; 'Cisco certification'
> Subject: RE: Interface shutdown automatically
>
> Either gremlins or err-disabled. i'll vote for #2.
>
> Your logging messages should be telling you WHY it does that. (use "sh
> int
> | in errd" to take a look around first!)
>
> Typically I see this when people are setting up their trunks or
> etherchannels. And if you aren't doing it fast enough (per the switch's
> opinion) you'll start to see things shutdown due to port
> inconsistencies.
>
> Cut 'n' paste from notepad makes things go faster!
>
> Or just treat it as expected behavior.
>
> HTH,
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
> JNCIE-M
> #153, JNCIS-ER, CISSP, et al.
> CCSI/JNCI-M/JNCI-ER
> VP - Technical Training - IPexpert, Inc.
> IPexpert Sr. Technical Instructor
>
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>
> smorris@ipexpert.com
>
>
>
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