Information Technology Reference
In-Depth Information
The tasks we review in this section are as follows:
Configure and Verify Network Services:
Set up NTP, DHCP, and TFTP.
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Configure Enterprise Parameters:
Modify and verify cluster-wide default settings.
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Configure Service Parameters:
Tune application settings and behavior.
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Service Activation
Many required services are deactivated by default on CUCM. Using the Unified Service-
ability admin page, you must activate the one you need. For our purposes, we activate the
Cisco CallManager, Cisco TFTP, and CISCO DHCP Monitor services. Figure 9-1 shows
the Unified Serviceability Service Activation page with those services activated.
Figure 9-1
Activating Required Services
DHCP Server Configuration
CUCM includes a basic DHCP server capability. It is intended to support only IP Phones,
and not very many of them: only up to 1,000 phones (this is the maximum recommended
due to heavy CPU load). There is no native capability for DHCP server redundancy and
only one DHCP server is supported per cluster, typically running on the Publisher. Multi-
ple subnets (scopes) can be configured on the server.
