Cisco IOS: Configure descriptions

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:

DEVICE(config) interface Fa0/1
DEVICE(config-if) description WAN to London

The description is displayed in the output of the show running-config command:

To erase the description, use the no description interface mode command (or the shortcut no desc):