What is CDP?
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What is CDP?
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Cisco Discovery Protocol (CDP) is a Cisco proprietary protocol. It works at the data link layer. CDP is enabled by default on all Cisco devices. Devices directly connected to one another receive CDP messages. A Cisco device does not forward a message to any device that is behind it. CDP messages are generated as multicast messages by a Cisco device on each of its active interfaces after every 60 seconds.
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