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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
These sections include CDP configuration information and procedures:
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Default CDP Configuration
Table 25-1
Table 25-1 Default CDP Configuration
Feature
CDP global state
CDP interface state
CDP timer (packet update frequency)
CDP holdtime (before discarding)
CDP Version-2 advertisements
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
advertisement type.
Note
Steps 2 through 4 are all optional and can be performed in any order.
Command
Step 1
configure terminal
Step 2
cdp timer seconds
Catalyst 3750 Switch Software Configuration Guide
25-2
Default CDP Configuration, page 25-2
Configuring the CDP Characteristics, page 25-2
Disabling and Enabling CDP, page 25-3
Disabling and Enabling CDP on an Interface, page 25-4
shows the default CDP configuration.
Purpose
Enter global configuration mode.
(Optional) Set the transmission frequency of CDP updates in seconds.
The range is 5 to 254; the default is 60 seconds.
Chapter 25
Default Setting
Enabled
Enabled
60 seconds
180 seconds
Enabled
Configuring CDP
78-16180-02
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