How to configure a Cisco Router as a DHCP Client

Posted: May 23, 2015 in CCNA
Tags: , , ,

In our previous article we already have seen how to configure Cisco Router as a DHCP Server,But today in this article we will learn how to configure a Cisco Router as a DHCP Client.When we configure a Router as a DHCP Client then the Router will be able to obtain it’s interface ip address automatically from DHCP Server.

router as a dhcp client

In above Topology Diagram you can clearly see Two Routers R1 and R2.

 

Now in this lab i will configure Router  “r1” as a DHCP SERVER and Router  “r2” as a DHCP Client.

 

Configuration on r1:

Router>enable

Router#config t

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#hostname r1

r1(config)#ip dhcp pool satish

r1(dhcp-config)#network 1.0.0.0 255.0.0.0

r1(dhcp-config)#default-router 1.0.0.1

r1(dhcp-config)#exit

r1(config)#int fa0/0

r1(config-if)#ip address 1.0.0.1 255.0.0.0

r1(config-if)#no shut

 

Configuration on r2:

Router>enable

Router#config t

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#hostname r2

r2(config)#int fa0/0

r2(config-if)#no shut

r2(config-if)#

%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up

r2(config-if)#ip address dhcp

 

Explanation:Here in above command ” ip address dhcp” command will automatically assign an ip address on router r2 fa0/0 interface.

Note:ip address dhcp will assign ip on interface on which you will run this command and it will ask for ip from DHCP SERVER.Here in our this LAB DHCP SERVER is Router r1.But you can also configure a dedicated Machine as a DHCP Server.

 

Test router r2  interface whether its got ip address or not:

 

r2#show int fa0/0

FastEthernet0/0 is up, line protocol is up (connected)

Hardware is Lance, address is 00e0.f77b.be01 (bia 00e0.f77b.be01)

Internet address is 1.0.0.2/8

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

ARP type: ARPA, ARP Timeout 04:00:00,

Last input 00:00:08, output 00:00:05, output hang never

Last clearing of “show interface” counters never

Input queue: 0/75/0 (size/max/drops); Total output drops: 0

Queueing strategy: fifo

Output queue :0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

2 packets input, 124 bytes, 0 no buffer

Received 2 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

0 input packets with dribble condition detected

2 packets output, 124 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

 

Note:If you feel any doubt or any problem in configuring or understanding this lab feel free to ask through comment section.If you have some ideas you can share.

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