CISCO DISCOVERY PROTOCOL (CDP)

CISCO DISCOVERY PROTOCOL (CDP)

+Layer 2 Protocol

+Cisco Properitary Protocol

+Used by Cisco Devices to discover other connected Cisco devices

+CDP Sends advertisements to directly connected devices

+BY DEFAULT ==> CDP IS ENABLED

+ CDP is enabled by default

PUNE_ROUTER>show cdp

Global CDP information:

Sending CDP packets every 60 seconds

Sending a holdtime value of 180 seconds

Sending CDPv2 advertisements is enabled

+ CDP Neighbor Output 

PUNE_ROUTER#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

PUNE_LAN_SW  Gig 0/0/0        152            S       2960        Fas 0/1

CHENNAI_ROUTER

             Ser 0/1/0        150            R       ISR4300     Ser 0/1/1

+ CDP Interfaces

PUNE_ROUTER#show cdp interface

Vlan1 is administratively down, line protocol is down

Sending CDP packets every 60 seconds

Holdtime is 180 seconds

GigabitEthernet0/0/0 is up, line protocol is up

Sending CDP packets every 60 seconds

Holdtime is 180 seconds

GigabitEthernet0/0/1 is administratively down, line protocol is down

Sending CDP packets every 60 seconds

Holdtime is 180 seconds

GigabitEthernet0/0/2 is administratively down, line protocol is down

Sending CDP packets every 60 seconds

Holdtime is 180 seconds

Serial0/1/0 is up, line protocol is up

Sending CDP packets every 60 seconds

Holdtime is 180 seconds

Serial0/1/1 is administratively down, line protocol is down

Sending CDP packets every 60 seconds

Holdtime is 180 seconds

PUNE_ROUTER#

+ CDP Disabled Globally

PUNE_ROUTER(config)#no cdp run

PUNE_ROUTER(config)#do wr

Building configuration...

[OK]

PUNE_ROUTER(config)#do show cdp

% CDP is not enabled

PUNE_ROUTER(config)#

+ CDP Disabled on an interface

PUNE_ROUTER(config)#int serial 0/1/0

PUNE_ROUTER(config-if)#no cdp enable 

Thanks for Reading 

NETWORK ENGINEER STUFF