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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Configuring CDP
Configuring CDP
For a switch and connected endpoint devices running Cisco Medianet
• CDP identifies connected endpoints that communicate directly with the switch.
• To prevent duplicate reports of neighboring devices, only one wired switch reports the location
information.
• The wired switch and the endpoints both send and receive location information.
For information:
http://www.cisco.com/en/US/docs/ios/netmgmt/configuration/guide/nm_cdp_discover.html.
The switch supports CDP Version 2.
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 1-2
• Configuring the CDP Characteristics, page 1-2
• Disabling and Enabling CDP, page 1-3
• Disabling and Enabling CDP on an Interface, page 1-4
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.
Table 1-1 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
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