Command
IP DHCP Pool
Use
This command enables DHCP services on the router and specifies the various DHCP options the server will assign to clients.
Syntax
Router(config)#ip dhcp pool <name>
Options
<network> network addresses that the DHCP pool may assign, this supports slash notation.
Ex network 192.168.1.0 255.255.255.0 or network 192.168.1.0 /24
<domain-name> sets a domain-name the DHCP server will assign to clients.
<dns-server> Sets DNS servers that the DHCP server will assign to clients.
<default-router> Sets the default gateway that the DHCP server will assign clients.
Example
In the below example we will configure R2 to provide DHCP services for R1
First we configure the DHCP server with ip dhcp pool
R2(config)#ip dhcp pool R1_Pool R2(dhcp-config)#network 10.1.1.0 /24 R2(dhcp-config)#dns-server 4.2.2.2 R2(dhcp-config)#default-router 10.4.4.1 R2(dhcp-config)#exit
Currently R1’s Fa0/0 does not have an IP address
R1(config-if)#do show ip interface brief | ex unass Interface IP-Address OK? Method Status Protocol Serial1/0 10.4.4.1 YES manual up up Loopback0 10.0.0.1 YES manual up up
After we configure ip address dhcp on R1’s Fa0/0 it receives an IP address of 10.1.1.1
R1(config)#int fa0/0 R1(config-if)#ip address dhcp R1(config-if)# *Mar 1 00:40:36.339: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.1.2 (FastEthernet0/0) is down: address changed R1(config-if)# *Mar 1 00:41:20.339: %DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0/0 assigned DHCP address 10.1.1.1, mask 255.255.255.0, hostname R1 R1(config-if)# *Mar 1 00:41:21.567: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.1.2 (FastEthernet0/0) is up: new adjacency R1(config-if)#