29-2
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 29 Configuring CDP
Configuring CDP
CDP and Switch Stacks
A switch stack appears as a single switch in the network. Therefore, CDP discovers the switch stack, not
the individual stack members. The switch stack sends CDP messages to neighboring network devices
when there are changes to the switch stack membership, such as stack members being added or removed.
Configuring CDP
• Default CDP Configuration, page 29-2
• Configuring the CDP Characteristics, page 29-2
• Disabling and Enabling CDP, page 29-3
• Disabling and Enabling CDP on an Interface, page 29-4
Default CDP Configuration
Configuring the CDP Characteristics
You can configure the frequency of CDP updates, the amount of time to hold the information before
discarding it, and whether or not to send Version-2 advertisements.
Beginning in privileged EXEC mode, follow these steps to configure the CDP timer, holdtime, and
adv
ertisement type.
Note Steps 2 through 4 are all optional and can be performed in any order.
Ta ble 29-1 Default CDP Configuration
Feature Default Setting
CDP global state Enabled
CDP interface state Enabled
CDP timer (packet update frequency) 60 seconds
CDP holdtime (before discarding) 180 seconds
CDP Version-2 advertisements Enabled
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
cdp timer seconds (Optional) Set the transmission frequency of CDP updates in seconds.
The range is 5 to 254; the default is 60 seconds.
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.
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