Cisco Systems CCNA 2 manual Command Purpose

Command	Purpose
clear cdp table	Deletes information about neighbors from the CDP
	table
clear cdp counters	Reset traffic counters to zero
show cdp traffic	Displays CD counters such as the number of
	packets sent and received and checksum errors
show debugging	Displays information about the types of debugging
	that are enabled for the router
debug cdp adjacency	Displays CDP neighbor information
debug cdp events	Displays CDP events
debug cdp ip	Displays CDP IP information
debug cdp packets	Displays CDP packet-related information
cdp timers	Specifies how often the Cisco IOS software sends
	CDP updates
cdp holdtime	Specifies the hold time to be sent in the
	CDP update packet
show cdp	Displays global CDP information such as timer and
	hold-time information

Review the following key points:

•CDP is Cisco proprietary.

•CDP runs on any SNAP-enabled media.

•CDP functions at Layer 2 and functions independent of the upper layers.

•CDP is used by all Cisco network devices such as routers, switches, and bridges.

•CDP utilizes periodic advertisements to obtain or update information about directly-connected devices

Have students perform the CDP neighbor lab.

Web Links

http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/fun_r/frprt3/frd3001b

.htm

44 - 238 CCNA 2: Routers and Routing Basics v3.1 Instructor Guide – Module 4 Copyright ♥ 2004, Cisco Systems, Inc.