Section 12. Managing Your Network Environment

Discovering Neighbors on the Network with CDP

Cisco Discovery Protocol (CDP) is a proprietary tool that enables access to protocol and address information on directly connected devices. CDP runs over the data link layer, allowing devices running different network layer protocols to learn about each other. CDP summary information includes device identifiers, address lists, port identifiers, and platform.

Figure 12-1 CDP

image

CDP runs over all LANs, Frame Relay, ATM, and other WANs employing Subnetwork Access Protocol (SNAP) encapsulation. CDP starts by default on bootup and sends updates every 60 seconds. ...

Get CCENT Quick Reference Sheets now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.