What is Cisco Discovery Protocol (CDP)

What is Cisco Discovery Protocol (CDP) networkingguruji1.com/2019/12/what-is-cisco-discovery-protocol-cdp.html

My Dear Friend in today’s article, I will tell you “What is Cisco Discovery Protocol (CDP)” If you any problem after reading this article, you can see the video below. Please don't forget to Like, Share, Comment & Subscribe to our Networking Guruji Channel for more video.

Previous post: - Disabling Dynamic Trunking Protocol (DTP)..Click Here

“Introduction to CDP (Cisco Discovery Protocol)” The ciscodiscoveryprotocol (CDP) is proprietary data link layer protocol (layer 2). It is used to share information about other directory connected cisco equipment, such as the operating system version, IP address, connected port, platform etc. cisco device CDP message send to the multicast address send.

(Exm… aa.00.11.bb.01. ab). CDP packets send every 60 sec’s and hold down timer 180 sec’s.

1/4

1 ---- Enable CDP on SW-1 globally and verify the connected port on SW-1.

---- Disable CDP on SW-1 port Fa0/1, now verify the output.

Cisco Discovery Protocol Configuration SW-1 SW-1(config)#cdp run SW-1(config)#interface fastethernet 0/1 SW-1(config-if)#no cdp enable SW-1#show cdp neighbors Capability codes: - R-Router, T- Trans Bridge, B – source router bridge, S – Switch, H – Host, I – IGMP, R – repeater, P – Phone.

Device ID SW-2

Local interface Holdtime Fa0/2 139

Capability S

Platform 2950

Port ID Fa0/2

“Cisco Discovery Protocol” In the above output we can see SW-1 has discovered SW-2 information using CDP. Here is the details…

2/4

Device ID --- Where we can see hostname of SW-2.

Local Interface --- Interface which SW-1 is using to connect SW-2.

Holdtime --- Specifies the amount of time a receiving device should hold the information send by your device before discarding it.

Capability --- Device model … 2950 catalyst cisco switch.

Port id --- Interface number on SW-2, this is remote port where SW-1 is connecting to SW-2.

How to configure 802.1q trunking configuration cisco catalyst switch… clickhere

“Cisco Discovery Protocol (CDP)” SW-1 has two trunk port, Fa0/1 and Fa0/2. But on the output we can see only Fa0/2, where is Fa0/1 which is connecting SW-3 and SW-3 is not in show cdp neighbour output.

Cisco Dynamic Trunking Protocol Modes Dtp….Click here And Configuring ISL Trunking cisco catalyst switch….Click here CDP was disable using no cdp enable command on Fa0/1 port and SW-1 cannot discover SW-3 information. This way you can disable CDP on a port.

3/4

Upcoming Cisco Discovery Protocol step by step tutorial…..

This is the full article “What is Cisco Discovery Protocol (CDP)” Thank you so much.

4/4