© 2005 Cisco Systems, Inc. All rights reserved.INTRO v Managing Your Network Environment Discovering Neighbors on the Network

© 2005 Cisco Systems, Inc. All rights reserved.INTRO v Outline Overview Cisco Discovery Protocol Information Obtained with CDP Implementation of CDP Using the show cdp neighbors Command Monitoring and Maintaining CDP Creating a Network Map of the Environment Summary

© 2005 Cisco Systems, Inc. All rights reserved.INTRO v Cisco Discovery Protocol CDP is a proprietary utility that provides a summary of directly connected switches, routers, and other Cisco devices. CDP discovers neighboring devices regardless of which protocol suite they are running. Physical media must support the SNAP encapsulation.

© 2005 Cisco Systems, Inc. All rights reserved.INTRO v Discovering Neighbors with CDP CDP runs on routers with Cisco IOS software Release 10.3 or later and on Cisco switches and hubs. Summary information includes: –Device identifiers –Address list –Port identifier –Capabilities list –Platform

© 2005 Cisco Systems, Inc. All rights reserved.INTRO v Using CDP

© 2005 Cisco Systems, Inc. All rights reserved.INTRO v Using the show cdp neighbors Command

© 2005 Cisco Systems, Inc. All rights reserved.INTRO v Using the show cdp entry Command

© 2005 Cisco Systems, Inc. All rights reserved.INTRO v Additional CDP Commands

© 2005 Cisco Systems, Inc. All rights reserved.INTRO v Creating a Network Map

© 2005 Cisco Systems, Inc. All rights reserved.INTRO v Summary The Cisco Discovery Protocol is an information-gathering tool used by network administrators to get information about directly connected devices. CDP exchanges hardware and software device information with its directly connected CDP neighbors. CDP on a router can be enabled or disabled as a whole or on a port-by-port basis.

© 2005 Cisco Systems, Inc. All rights reserved.INTRO v Summary (Cont.) The show cdp neighbors command displays information about the CDP neighbors of a router. The show cdp entry, show cdp traffic, and show cdp interface commands display detailed CDP information on a Cisco device. Using the information obtained from the show cdp commands output, a network topology map can be created to aid troubleshooting.

© 2005 Cisco Systems, Inc. All rights reserved.INTRO v