Re-enabling a port disabled by port flap dampening
A port disabled by port flap dampening is automatically re-enabled once the wait period expires; however, if the wait period is set to zero (0) seconds, you must re-enable the port by entering the following command on the disabled port.
device(config)# interface ethernet 1/2/1 device(config-if-e10000-1/2/1)# no link-error-disable 10 3 10