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http://www.ciscopress.com/articles/article.asp?p=1574301&seqNum=5
Configuring DHCP Server on a Router or Layer 3 Switch
Router(config)#ip dhcp pool internal
Creates a DHCP pool called internal.
Router(dhcp-config)#network 172.16.10.0 255.255.255.0
Defines the range of addresses to be leased.
Router(dhcp-config)#default-router 172.16.10.1
Defines the address of the default router for the client.
Router(dhcp-config)#dns-server 172.16.10.10
Defines the address of the Domain Name System (DNS) server for the client.
Router(dhcp-config)#netbios-name-server 172.16.10.10
Defines the address of the NetBIOS server for the client.
Router(dhcp-config)#domain-name fakedomainname.ca
Defines the domain name for the client.
Router(dhcp-config)#lease 14 12 23
Defines the lease time to be 14 days, 12 hours, 23 minutes.
Router(dhcp-config)#lease infinite
Sets the lease time to infinity; the default time is 1 day.
Router(dhcp-config)#exit
Returns to global configuration mode.
Router(config)#ip dhcp excluded-address 172.16.10.1 172.16.10.9
Specifies the range of addresses not to be leased out to clients.
Router(config)#service dhcp
Enables the DHCP service and relay features on a Cisco IOS router.
Router(config)#no service dhcp
Turns off the DHCP service. DHCP service is enabled by default in Cisco IOS Software.