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16-2
Cisco Aironet 1100 Series Access Point Installation and Configuration Guide
OL-2851-01
Chapter 16 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 CiscoWorks2000.
CDP is enabled on the access point’s Ethernet port by default. However, CDP is enabled on the access
point’s radio port only when the radio is associated to another wireless infrastructure device, such as an
access point or a bridge.
Configuring CDP
This section contains CDP configuration information and procedures:
•
Default CDP Configuration, page 16-2
•
Configuring the CDP Characteristics, page 16-2
•
Disabling and Enabling CDP, page 16-3
•
Disabling and Enabling CDP on an Interface, page 16-4
Default CDP Configuration
Table 16-1
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 Priveleged Exec mode, follow these steps to configure the CDP holdtime and CDP timer.
Table 16-1 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
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
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 from 10 to 255 seconds; the default is 180 seconds.