User's Manual

Device Management
Device Discovery
Cisco ISA500 Series Integrated Security Appliance Administrator Guide 323
10
CDP
Cisco Discovery Protocol (CDP) is a device discovery protocol that runs on all
Cisco manufactured equipment. Each CDP enabled device sends periodic
messages to a multicast address and also listens to the periodic messages sent
by others in order to learn about neighboring devices and determine the status of
these devices. Use the CDP page to configure the settings to control CDP.
NOTE Enabling CDP is not recommended on the dedicated WAN port and the
configurable ports because they are connected to insecure networks.
STEP 1 Click Device Management -> Discovery -> CDP.
The CDP window opens.
STEP 2 In the CDP Configuration area, enter the following information:
• CDP: Choose one of the following options:
- Enable All: Enables CDP on all ports supported by the security
appliance.
- Disable All: Disables CDP on all ports supported by the security
appliance.
- Per Port: Configures CDP on selective ports.
• CDP Timer: Enter the value of the time interval between two successive
CDP packets sent by the security appliance.
• CDP Hold Timer: The hold timer is the amount of time the information sent
in the CDP packet should be cached by the device which receives the CDP
packet, after which the information is expires.
STEP 3 In the Enable CDP area, click On to enable CDP on each interface, or click Off to
disable CDP. This is required if you choose Per Port from the CDP drop-down list.
STEP 4 Click Save to apply your settings.