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Cisco Discovery Protocol (CDP) is a protocol for discovering Cisco devices on a network. CDP enables discovery of Cisco CallManager servers and management of those servers by CiscoWorks2000.
With CDP Advertisement Support (version 1), Cisco CallManager periodically sends out CDP messages on the active interface to a designated multicast address. These messages contain information such as device identification, interface name, system capabilities, SNMP agent address, and time-to-live.
Any Cisco device with CDP support can locate a Cisco CallManager by listening to these periodic messages. For example, Cisco CallManager Agent IP addresses can be discovered via the CDP cache from their direct neighboring devices.
The default CDP settings are as follows.
Description | Default Value |
Default Transmit Frequency | 60 seconds |
Default Time to Live | 180 seconds |
Default State | CDP advertisement enabled |
CDP is designed as a Windows 2000 Protocol Driver to run with Cisco CallManager on a Cisco Media Convergence Server with a 10/100BaseT Ethernet NIC. Other media, such as Token Ring, ATM or Windows NT platforms (including Windows 98 or Windows NT 4.0) are not supported.
By default, the CDP driver is enabled when Cisco CallManager is started up. You can use CDP to allow CiscoWorks2000 to discover and manage your Cisco CallManagers.
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Note For more information, see the "Using Management Information Bases" section. |
Once you have used the CDP cache MIB of the direct neighboring device to discover the Cisco CallManager, you can use CiscoWorks2000 to query other Cisco CallManager-supported MIBs for provisions or statistics information about topology services, user tracking, path analysis and other network management services.
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Tips You can use the show CDP command from the direct neighboring device of Cisco CallManager to check CDP information advertised by Cisco CallManager. |
You can control the CDP driver using the CISCO-CDP-MIB. For more information, see the "Cisco CallManager MIB Tables" section.
When you are using CiscoWorks2000, you must have the CDP driver enabled at all times to discover Cisco CallManager.
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Caution Only in special cases should you alter the CDP setting. For example, you might restart the CDP driver from the Control Panel at run-time to pick up the latest IP configuration changes without resetting the system. |
The CDP driver is installed as part of the Cisco CallManager Release 3.0 installation process. Figure 10-1 illustrates that upon completion of a successful Cisco CallManager Release 3.0 installation, the CDP protocol driver resides in the list of device drivers under the Windows 2000 Control Panel.
To start the CDP protocol driver:
Step 2 Select Start > Settings > Control Panel to access the Windows 2000 Control Panel Menu.
Step 3 Double-click the System icon and select the Hardware tab in the dialog box.
Step 4 Select Device Manager.
Step 5 Select View and select both devices by connection.
Step 6 Select Hidden Devices to show all drivers.
Step 7 Double-click CDP Protocol Driver, then select the Driver tab.
Step 8 Select Start to enable the driver (Default = Start).
Step 9 Select OK to exit menu.
Step 10 Start the Cisco SNMP Data Collector Service.
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Note Selecting Startup Type=Demand keeps Start setting after a restart. |
To enable the CDP protocol driver:
Step 2 Double-click the System icon and select the Hardware tab in the dialog box.
Step 3 Select Device Manager.
Step 4 Select View and select both devices by connection.
Step 5 Select Show Hidden Devices to show all drivers.
Step 6 Select CDP Protocol Driver, then select Enable Device.
Step 7 Select Next, then Finish to enable device.
Step 8 Select Close and restart the system.
Step 9 After the system is up, start the Cisco SNMP Data Collector service.
To show CDP protocol driver property:
Step 2 Right-click on cdp.sys and select Properties to show CDP driver properties, such as driver version and date.
The CDP Protocol Driver runs on top of the existing Ethernet NIC. You can restart CDP when a new IP address is configured at runtime.
To update the CDP protocol driver:
Step 2 You do not have to reset the system after updating.
When you install Cisco CallManager Release 3.0, these components are updated:
Posted: Mon Jun 12 18:19:57 PDT 2000
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