Configuration Guide     96
Managing Physical Interfaces Loopback Detection Configuration
Switch(config)#loopback-detection
Switch(config)#show loopback-detection global
 Loopback detection global status : enable
 Loopback detection interval : 30 s
 Loopback detection recovery time : 90 s
Switch(config-if)#end
Switch#copy running-config startup-config
The following example shows how to enable loopback detection of port 1/0/3 and set the 
process mode as alert and recovery mode as auto:
Switch#configure
Switch(config)#interface gigabitEthernet 1/0/3
Switch(config-if)#loopback-detection
Switch(config-if)#loopback-detection config process-mode alert recovery-mode auto
Switch(config-if)#show loopback-detection interface gigabitEthernet 1/0/3
 Port           Enable      Process Mode        Recovery Mode        Loopback      Block        LAG
 ----             ------          ------------               -------------                  --------              -----          ----
 Gi1/0/3     enable      alert                           auto                                  N/A                   N/A          N/A
Switch(config-if)#end
Switch#copy running-config startup-config