IP DHCP Pool Command on CISCO Router/Switch

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

IP DHCP Pool Command on CISCO Router/Switch 1

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)#

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