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Cisco Discovery Protocol is an OSI Layer 2 network protocol, a Cisco Systems proprietary protocol used by Cisco routers to obtain protocol addresses of nearby devices, also to show the IOS version running on these devices. CDP can also be used to show details about the interfaces on one's router. CDP runs on all Cisco devices.

CDP can be used on all media that support Subnet Access Protocol - this includes Ethernet, Frame Relay and Asynchronous Transfer Mode (ATM).

Each device which has CDP enabled sends advertisements to a multicast address. These advertisements contain the CDP data and also a time period for which the receiving devices should store the data before discarding it.

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