Network Management : Cisco Discovery Protocol (CDP)
Cisco Discovery Protocol (CDP) is a Cisco proprietary Layer 2 protocol that is used to gather information about Cisco devices which share the same data link. The device sends periodic CDP advertisements to connected devices. CDP can be used as a network discovery tool to determine the information about the neighboring devices. This information gathered from CDP can help build a logical topology of a network when documentation is missing or lacking in detail. CDP can assist in network design decisions, troubleshooting, and making changes to equipment. On Cisco devices, CDP is enabled by default. To verify the status of CDP and display information about CDP, enter the show cdp command. To enable CDP globally for all the supported interfaces on the device, enter cdp run in the global configuration mode. To enable CDP on the specific interface, enter the cdp enable command. To verify the status of CDP and display a list of neighbors, use the show cdp neighbors command in the privileged EXEC mode. The show cdp neighbors command provides helpful information about each CDP neighbor device, including device identifiers, port identifier, capabilities list, and platform. Use the show cdp interface command to display the interfaces that are CDP enabled on a device.
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simple network management protocol
