The Cisco Discovery Protocol (CDP) is a proprietary layer 2 network protocol developed by Cisco Systems that runs on most Cisco equipment and is used to share information about other directly connected Cisco equipment such as the operating system version and IP address.

Enable/Disable CDP Globally

(config)# cdp run
(config)# no cdp run

Disable an Interface

(config-if)# no cdp enable

Enable an Interface

(config-if)# cdp enable

Additional Commands

# show cdp
# show cdp neighbor detail
# show cdp neighbor
# show cdp interface
(config)# cdp timer 45
(config)# cdp holdtime 60