CISCO DISCOVERY PROTOCOL - CDP

CISCO DISCOVERY PROTOCOL - CDP

CDP is enabled by default on all Cisco devices. It is used for troubleshooting connectivity between Cisco devices. To check the output of Cisco discovery protocol (CDP) use the following commands.

The following command will show CDP hello and the hold-down interval.

Syntax:

Router#show cdp

KOLKATA#sh cdp
     Global CDP information:
     Sending CDP packets every 60 seconds
     Sending a holdtime value of 180 seconds
     Sending CDPv2 advertisements is enabled

The following command will show the brief information of the directly connected Cisco devices Like hostname, interface to which it is connected, the model of the device etc.

Syntax:

Router#show cdp neighbor

Output:

KOLKATA#sh 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

Switch                             Fas 0/0               149                  S                      2950              Fas 0/1

MUMBAI                          Ser 0/0/0           149                  R                      C1841           Ser 0/0/1

DELHI                              Ser 0/0/1           149                  R                      C1841           Ser 0/0/0

The following command will show detail information to the directly connected cisco devices Like- IP address lOS version, platform of the remote device etc.

Syntax:

Router#show cdp neighbor detail

Output:

KOLKATA#sh cdp neighbors detail

Device ID: Switch

Entry address(es): 

Platform: cisco 2950, Capabilities: Switch

Interface: FastEthernet0/0, Port ID (outgoing port): FastEthernet0/1

Holdtime: 141

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

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Device ID: MUMBAI

Entry address(es): 

  IP address : 172.17.0.2

Platform: cisco C1841, Capabilities: Router

Interface: Serial0/0/0, Port ID (outgoing port): Serial0/0/1

Holdtime: 141

Version :

Cisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2007 by Cisco Systems, Inc.

Compiled Wed 18-Jul-07 04:52 by pt_team

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Device ID: DELHI

Entry address(es): 

  IP address : 172.16.0.1

Platform: cisco C1841, Capabilities: Router

Interface: Serial0/0/1, Port ID (outgoing port): Serial0/0/0

Holdtime: 141

Version :

Cisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2007 by Cisco Systems, Inc.

Compiled Wed 18-Jul-07 04:52 by pt_team

advertisement version: 2

Duplex: full