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12-2
Cisco Unified Communications Manager Administration Guide
OL-18611-01
Chapter 12 DHCP Server Configuration
Activating DHCP Monitor Service
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.
Bootstrap Server IPv4
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 IPv4 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.
Table 12-1 DHCP Server Configuration Settings (continued)
Server Information Field Description