Controller Based WLANs

How does the error disable feature on access layer Cisco switches affect Aruba APs when Aruba APs are deployed on Cisco switches?

Product and Software: This article applies to all Aruba APs and ArubaOS versions.

 

The errDisable status feature is used by Cisco (and other switch vendors) that is designed to protect the network from issues resulting from switch misconfiguration and other errors in the network. The errDisable status feature describes a port that has been shut down by the switch operating system due to an error detected on the port.

 

After a port is placed into the errDisable state, an administrator must manually re-enable the port. This feature is reserved for errors that might seriously jeopardize the stability of the switch or the entire LAN network.

 

When deploying an Aruba AP on a third-party switch, we are specifically interested in error disable with the link flap feature. If the link goes down or the AP reboots several times, the Cisco switch puts the port in an error disable state. The AP then bootstraps again and again.

 

If auto error disable recovery is enabled, the Cisco switch performs an auto error disable recovery after 300 seconds. If the AP then reboots, the link flaps and error disable activates again, which would cause an endless bootstrap and reboot loop.

 

Recommendations on settings for error disable with the link flap feature:

 

Switch(config)#errdisable recovery cause link-flap 
Switch(config)# errdisable recovery interval 5 seconds

 

A work around is to increase the bootstrap threshold to a very high value, but this is not recommended.

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‎07-09-2014 02:35 PM
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