If you are familair with Cisco Discovery Protocol (CDP), click the following link to know what is Cisco Discovery Protocol (CDP)

Important Cisco Discovery Protocol (CDP) IOS commands are listed below.

• To see the summary of Cisco device neighbors, run the "show cdp neighbors" IOS command from privilege mode.

 

omnisecu.com.router01#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
omnisecu.com.router02
Ser 0/0 156 R C2600 Ser 0/0
omnisecu.com.switch01
Fas 0/0 149 S 2950 Fas 0/1
omnisecu.com.router01#

 

• To see the detailed information of Cisco device neighbors, run the "show cdp neighbor detail" IOS command from privilege mode.

 

omnisecu.com.router01#show cdp neighbor detail

Device ID: omnisecu.com.router02
Entry address(es):
IP address : 172.17.0.2
Platform: cisco C2600, Capabilities: Router
Interface: Serial0/0, Port ID (outgoing port): Serial0/0
Holdtime: 143

Version :
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-I-M), Version 12.2(28), RELEASE SOFTWARE (fc5)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Wed 27-Apr-04 19:01 by miwang

advertisement version: 2
Duplex: full
---------------------------

Device ID: omnisecu.com.switch01
Entry address(es):
Platform: cisco 2950, Capabilities: Switch
Interface: FastEthernet0/0, Port ID (outgoing port): FastEthernet0/1
Holdtime: 136

Version :
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA4, RELEASE SOFTWARE(fc1)
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Wed 18-May-05 22:31 by jharirba

advertisement version: 2
Duplex: full

omnisecu.com.router01#

 

• To view the Cisco Discovery Protocol (CDP) configuration on interface, run the "show cdp interface" IOS command from privilege mode.

 

omnisecu.com.router01#show cdp interface
FastEthernet0/0 is up, line protocol is up
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
FastEthernet0/1 is administratively down, line protocol is down
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Serial0/0 is up, line protocol is up
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Serial0/1 is administratively down, line protocol is down
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
omnisecu.com.router01#

 

• To see the status of Cisco Discovery Protocol (CDP) on your Cisco device run the "show cdp" IOS command from privilege mode.

 

omnisecu.com.router01#show cdp
Global CDP information:
Sending CDP packets every 60 seconds
Sending a holdtime value of 180 seconds
Sending CDPv2 advertisements is enabled