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27-3
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter 27 Configuring CDP
Configuring CDP
Use the no form of the CDP commands to return to the default settings.
This example shows how to configure CDP characteristics.
Switch# configure terminal
Switch(config)# cdp timer 50
Switch(config)# cdp holdtime 120
Switch(config)# cdp advertise-v2
Switch(config)# end
For additional CDP show commands, see the “Monitoring and Maintaining CDP” section on page 27-5.
Disabling and Enabling CDP
CDP is enabled by default.
Note Switch clusters and other Cisco devices (such as Cisco IP Phones) regularly exchange CDP messages.
Disabling CDP can interrupt cluster discovery and device connectivity. For more information, see
Chapter 6, “Clustering Switches” and see Getting Started with Cisco Network Assistant, available on
Cisco.com.
Beginning in privileged EXEC mode, follow these steps to disable the CDP device discovery capability:
Beginning in privileged EXEC mode, follow these steps to enable CDP when it has been disabled:
Step 3
cdp holdtime seconds (Optional) Specify the amount of time a receiving device should hold the
information sent by your device before discarding it.
The range is 10 to 255 seconds; the default is 180 seconds.
Step 4
cdp advertise-v2 (Optional) Configure CDP to send Version-2 advertisements.
This is the default state.
Step 5
end Return to privileged EXEC mode.
Step 6
show cdp Verify your settings.
Step 7
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
no cdp run Disable CDP.
Step 3
end Return to privileged EXEC mode.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
cdp run Enable CDP after disabling it.
Step 3
end Return to privileged EXEC mode.