CDP is cisco proprietary protocol and runs over the data link layer only. Therefore, two systems that support different network-layer protocols can learn about each other.
Enabling CDP on a Local Router
CDP is enabled on Cisco routers by default. If you prefer not to use the CDP device discovery capability, you can disable it with the no cdp run command.
To reenable CDP after disabling it, use the following command in global configuration mode:
you may also disable it by going to interface level and type no cdp enable and to reenable it type cdp enable
Enabling CDP on an Interface
CDP is enabled by default on all supported interfaces (except for Frame Relay multipoint subinterfaces) to send and receive CDP information. However, some interfaces, such as ATM interfaces, do not support CDP.
You can disable CDP on an interface which supports CDP with the no cdp enable command.
To reenable CDP on an interface after disabling it, use the following command in interface configuration mode:
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