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Automatically recover err-disabled ports.

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Cisco switches have a feature built-in so ports in an err-disabled state automatically reset themselves saving you the time of having to connect to the switch and manually shut and no shut these interfaces. Only two parameters need to be considered when configuring this feature.

The first parameter concerns which errors you want the switch port to automatically recover from. For example you may not want a port with a security violation to come back up without administrative intervention, but a port downed due to a flapping host you might want automatically turned back on after a few minutes. You can issue the errdisable recovery cause ? command to see a list of switch port errors that the switch can automatically recovery from.

The second option you can configure is the time  interval in which the switch waits before it re-enables the err-disabled port. The default recovery interval is 300 seconds.

As you can see, this is all down from global config mode.

While this err-disable recovery feature can be a great time saver it is still important to investigate and correct the real issue that is causing the switch ports to fail into an err-disabled state.

Written by Stephen J. Occhiogrosso

April 11, 2011 at 7:07 PM

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