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26-2
Catalyst 3750 Switch Software Configuration Guide
OL-8550-09
Chapter 26 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, go to:
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
These sections contain this configuration information:
• Default CDP Configuration, page 26-2
• Configuring the CDP Characteristics, page 26-3
• Disabling and Enabling CDP, page 26-3
• Disabling and Enabling CDP on an Interface, page 26-4
Default CDP Configuration
Table 26-1 shows the default CDP configuration.
Table 26-1 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