What are reasons err-disabled would occur on interface

[osmhquser]

We have a Cisco 3750G-POE 24 port switch. A user's port status went into err-disabled status. The switch is not configured for port-security. What are some reasons why a port would go err-disabled?

Thx in advance for any help provided.

[Ton V Engelen · Accepted solution]

• 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

  
  
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• See link:

  
  
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• http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00806cd87b.shtml#topic3

  
  
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[osmhquser]

Thx for your quick response. Have a good day.

[glen.grant]

Usually it will tell you in the log why it was err-disabled.

[Pulkit Nagpal]

Thanks Ton, for replying quickly and helping Mark in time.

Regards,

Pulkit

Techincal Community Manager