Information Technology Reference
In-Depth Information
Configuring DHCP in Router IOS
Cisco routers support basic DHCP server functionality, commonly used in small office en-
vironments where a dedicated DHCP server is not needed or available. The following com-
mands show a typical DHCP configuration, with commands annotated for reference:
service dhcp
! Enables the DHCP service
!
ip dhcp excluded-address 10.1.1.1 10.1.1.10
! Specifies a start / end range of addresses that DHCP will NOT assign
ip dhcp pool name IP_PH0NES
! Creates a pool of addresses (case-sensitive name) and enters DHCP configura-
tion mode
!
network 10.1.1.0 255.255.255.0
! Defines the subnet address for the pool
default-router address 10.1.1.1
! Defines the default gateway
dns-server address 192.168.1.10 192.168.1.11
! Identifies the DNS server IP address(es) - up to 8 IPs
!
option 150 ip 192.168.1.2
! Identifies the TFTP server IP. Multiple IPs may be included, separated by
spaces.
Multiple DHCP pools can be created, so DHCP services can be provided for PCs in a
small office by the same router. For some third-party SIP phones, it may be necessary to
specify Option 66 (the TFTP server DNS name).
IP Phone Configuration Requirements in CUCM
CUCM has several many configuration elements for IP Phones. We briefly look at the fol-
lowing basic required elements:
Key
To p i c
Device Pool
■
Cisco Unified CM Group
■
Region
■
Location
■
Date/Time Group
■
Phone NTP Reference
■
Device Defaults
■
Softkey Template
■
Phone Button Template
■
SIP Profile
■
