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Cisco Discovery Protocol – CDP : Quick Definition | Cisco Collaboration

CDP is a Cisco proprietary protocol that was designed for neighbor discovery. It is a Layer 2 protocol that sends multicast advertisements using SNAP encapsulation. The advertisements are sent by default every 60 seconds, and there is a default hold time of 180 seconds.

CDP advertisements can contain information such as DeviceID, Address, PortID, Capabilities, Version, Platform and native VLAN with much information in ASCII format.