Adding a description to an interface on a Cisco device doesn’t provide any extra functionality, but it is useful for administrative purposes, since it will help you to remember the interface function. A description of an interface is locally significant and can be up to 240 characters long. It can be set using the description command from the interface submode:
Router(config)#interface g0/0 Router(config-if)#description WAN to London
The description is displayed in the output of the show running-config command:
! interface GigabitEthernet0/0 description WAN to London no ip address duplex auto speed auto shutdown ! interface GigabitEthernet0/1 no ip address duplex auto speed auto shutdown !
To erase the description, use the no description interface mode command (or the shortcut no desc):
Router(config)#int g0/0 Router(config-if)#no desc
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