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17-2
Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-30644-01
Chapter 17 Configuring CDP
Understanding CDP
Understanding CDP
Cisco Discovery Protocol (CDP) is a device-discovery protocol that runs on all Cisco network
equipment. Each device sends identifying messages to a multicast address, and each device monitors the
messages sent by other devices. Information in CDP packets is used in network management software
such as Cisco Prime Infrastructure2000.
CDP is used in network management to know about the neighbors of a given network device. CDP is
enabled on the access point radio port only when the radio is associated to another wireless infrastructure
device, such as an access point or a bridge. CDP is sent on the lowest VLAN number configured on the
access point. When more than on VLAN is used in a wireless network, We recommend that the lowest
VLAN number configured be used as the native VLAN
Note For best performance on your wireless LAN, disable CDP on all radio interfaces and on sub-interfaces
if VLANs are enabled on the access point.
Configuring CDP
This section contains CDP configuration information and procedures:
• Default CDP Configuration, page 17-2
• Configuring the CDP Characteristics, page 17-2
• Disabling and Enabling CDP, page 17-3
• Disabling and Enabling CDP on an Interface, page 17-4
Default CDP Configuration
Table 17-1 lists the default CDP settings.
Configuring the CDP Characteristics
You can configure the CDP holdtime (the number of seconds before the access point discards CDP
packets) and the CDP timer (the number of seconds between each CDP packets the access point sends).
Beginning in Privileged Exec mode, follow these steps to configure the CDP holdtime and CDP timer.
Table 17-1 Default CDP Configuration
Feature Default Setting
CDP global state Enabled
CDP interface state Enabled
CDP holdtime (packet holdtime in seconds) 180
CDP timer (packets sent every x seconds) 60