Cisco Unified Communications Manager Administration Guide, Release 6.1(1)
DHCP Server Configuration
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DHCP Server Configuration

Table Of Contents

DHCP Server Configuration

Activating DHCP Monitor Service

Starting DHCP Monitor Service

Finding a DHCP Server

Configuring a DHCP Server

DHCP Server Configuration Settings

Deleting a DHCP Server

Related Topics


DHCP Server Configuration


Dynamic Host Configuration Protocol (DHCP) server enables Cisco Unified IP Phones, connected to either the customer's data or voice Ethernet network, to dynamically obtain their IP addresses and configuration information. DHCP uses Domain Name System (DNS) to resolve host names both within and outside the cluster.

This chapter contains the following topics:

Activating DHCP Monitor Service

Starting DHCP Monitor Service

Finding a DHCP Server

Configuring a DHCP Server

DHCP Server Configuration Settings

Deleting a DHCP Server

Activating DHCP Monitor Service

You can activate and deactivate DHCP monitor process by using the Serviceability window of Cisco Unified Communications Manager. Use the following procedure to activate the service.

Procedure


Step 1 From Cisco Unified Serviceability, choose Tools > Service Activation.

The Service Activation window displays.

Step 2 Choose the Cisco Unified Communications Manager server from the Servers drop-down list box and click Go.

Step 3 Choose Cisco DHCP Monitor Service from the Unified CM Services list and click Save.


Note If the service is already activated, the Activation Status will display as Activated.


Step 4 The service gets activated, and the Activation Status column displays the status as Activated.



Note The DHCP monitor service starts automatically after it is activated. See the "Starting DHCP Monitor Service" section to stop, start, or restart the service.


Additional Information

See the "Related Topics" section.

Starting DHCP Monitor Service

The DHCP Monitor Service starts automatically after it is activated by using Cisco Unified Serviceability. This section describes the procedures to stop or restart the DHCP service.

Procedure


Step 1 In Cisco Unified Serviceability, choose Tools > Control Center - Feature Services.

The Control Center-Feature Services window displays.

Step 2 Choose the Cisco Unified Communications Manager server from the Servers drop-down list box and click Go.

Cisco DHCP Monitor Service displays in the list under Service Name column, in Unified CM Services.


Note If the Cisco DHCP Monitor Service was activated by using "Activating DHCP Monitor Service" section, the Status displays as Activated.


Step 3 Check the radio button corresponding to Cisco DHCP Monitor Service.

Step 4 If you want to restart the Cisco DHCP Monitor Service, click Restart.

The service restarts, and the message, Service Successfully Restarted, displays.

Step 5 If you want to stop the Cisco DHCP Monitor Service, click Stop.

The service stops, and the message, Service Successfully Stopped, displays.

Step 6 If you want to start a stopped Cisco DHCP Monitor Service, click Start.

The service starts, and the message, Cisco DHCP Monitor Service Restarted Successfully, displays.


Additional Information

See the "Related Topics" section.

Finding a DHCP Server

Because you might have several servers in your network, Cisco Unified Communications Manager lets you locate specific DHCP servers on the basis of specific criteria. Use the following procedure to locate servers.


Note During your work in a browser session, the cookies on the client machine store your find/list search preferences. If you navigate to other menu items and return to this menu item, or if you close the browser and then reopen a new browser window, the system retains your Cisco Unified Communications Manager search preferences until you modify your search.


Procedure


Step 1 Choose System > DHCP > DHCP Server.

The Find and List DHCP Servers window displays.

Step 2 To find all records in the database, ensure the dialog box is empty; go to Step 3.

To filter or search records:

From the first drop-down list box, select a search parameter.

From the second drop-down list box, select a search pattern.

Specify the appropriate search text, if applicable.


Note To add additional search criteria click the + button. When you add criteria, the system searches for a record that matches all criteria that you specify. To remove criteria, click the - button to remove the last added criteria or click the Clear Filter button to remove all added search criteria.


Step 3 Click Find.

All or matching records display. You can change the number of items that display on each page by choosing a different value from the Rows per Page drop-down list box.


Note You can delete multiple records from the database by checking the check boxes next to the appropriate record and clicking Delete Selected. You can delete all configurable records for this selection by clicking Select All and then clicking Delete Selected.


Step 4 From the list of records that display, click the link for the record you want to view.


Note To reverse the sort order, click the up or down arrow, if available, in the list header.


The window displays the item that you choose.


Additional Information

See the "Related Topics" section.

Configuring a DHCP Server

This section describes how to add, copy, and update a DHCP server address to the Cisco Unified Communications Manager database.

Procedure


Step 1 Choose System > DHCP > DHCP Server

Step 2 Perform one of the following tasks:

To add a DHCP server, click Add New.

To update a server, find the server by using the procedure in the "Finding a DHCP Server" section.

To copy a server, find the server by using the procedure in the "Finding a DHCP Server" section, select the DHCP server that you want by checking the check box next to the server name, and click the Copy icon.

The DHCP Server Configuration window displays.

Step 3 Enter the appropriate settings as described in Table 12-1.

Step 4 Click the Save icon that displays in the tool bar in the upper, left corner of the window (or click the Save button that displays at the bottom of the window) to save the data and to add the server to the database.


Additional Information

See the "Related Topics" section.

DHCP Server Configuration Settings

Table 12-1 describes the server configuration settings. For related procedures, see the "Related Topics" section.

Table 12-1 DHCP Server Configuration Settings 

Server Information Field
Description

Host Server

Select a host server from the drop-down list of available host servers.

Primary DNS IP Address

This field specifies primary DNS IP address.

Secondary DNS IP Server

This field specifies secondary DNS IP address name.

Primary TFTP Server IP Address (Option 150)

You can enable the IP phones to access the TFTP server using DHCP custom option 150. This is the method that Cisco recommends.

This field specifies the IP address for primary Trivial File Transfer Protocol (TFTP) server.

Secondary TFTP Server IP Address (Option 150)

This field specifies the IP address for secondary TFTP server.

Bootstrap Server IP Address

This field specifies the address of the server that is used in the next step of the bootstrap process. You can use as the IP address of the TFTP server or as the default value to DHCP server address if the server supplies the next bootstrap service.

Domain Name

The Domain Name specifies the domain name that you should use when resolving hostname via the Domain Name System.

TFTP Server Name (Option 66)

You can enable the IP phones to access the TFTP server by using DHCP option 66.

Use this field to identify a TFTP server. You can configure only one DNS name or a dotted decimal IP address in this parameter.

ARP Cache Timeout

This field specifies the timeout in seconds for ARP cache entries. Specify the time as a 32-bit unsigned integer. The default for the Cisco Network Registrar (CNR) DHCP server specifies 60 seconds.

IP Address Lease Time

The DHCP server uses the information in this field to specify the lease time that it is willing to offer. Specify the time in units of seconds and as a 32-bit unsigned integer. The default for the CNR DHCP server specifies seven days (604,800 seconds).

Renewal(T1) Time (sec)

This field specifies the time interval from address assignment until the client transitions to the RENEWING state. Typically, set this field to half the value of the IP address lease time. For example, if the IP address lease time is typically set to 60,000 seconds, the renewal time gets set to 30,000 seconds.

Rebinding (T2) Time (sec)

This field specifies the time interval from address assignment until the client transitions to the REBINDING state. Specify the value in units of seconds and as a 32-bit unsigned integer. Typically, set this field to approximately 75 percent of the value of the IP address lease time. For example, if the IP address lease time is set to 60,000 seconds, the rebinding time typically gets set to about 45,000 seconds. In Windows, 85 percent of the value of the IP address lease time represents the standard.


Deleting a DHCP Server

This section describes how to delete a DHCP server from the Cisco Unified Communications Manager database.

Procedure


Step 1 Find the DHCP server by using the procedure in the "Finding a DHCP Server" section.

Step 2 From list of matching records, choose the DHCP server that you want to delete.

Step 3 Click the Delete Selected icon that displays in the tool bar in the upper, left corner of the window (or click the Delete Selected button that displays at the bottom of the window) to delete the server.

If the server is not in use, Cisco Unified Communications Manager deletes it. If it is in use, an error message displays.


Note You can delete multiple host servers from the Find and List Servers window by checking the check boxes next to the appropriate servers and clicking Delete Selected. You can delete all servers in the window by clicking Select All and then clicking Delete Selected.



Additional Information

See the "Related Topics" section.

Related Topics

Activating DHCP Monitor Service

Starting DHCP Monitor Service

Finding a DHCP Server

Configuring a DHCP Server

Deleting a DHCP Server

DHCP Server Configuration Settings

DHCP Subnet Configuration

Additional Information

Dynamic Host Configuration Protocol, Cisco Unified Communications Manager System Guide