Cisco Switch: Configure DHCP Scenario

Created by Gautam Sharma in Articles 23 Nov 2023

Task

In this task, SW1 will be configured as a DHCP Server, and all four routers will be DHCP Clients. Configure DHCP Server functionality on SW11 using the following criteria:

Pool Name	Network Address	Subnet Mask	Default Router	Lease Time
vlan2	10.10.10.8	/29	10.10.10.9	1-day
vlan3	10.10.10.32	/29	10.10.10.33	1-day
vlan4	30.30.30.0	/26	30.30.30.1	1-day
vlan5	20.20.20.96	/27	20.20.20.97	1-day

Explanation

Configure all FastEthernet interfaces on the routers (connected to the switches shown in the topology diagram) to obtain their IP address dynamically via DHCP. Verify that your routers have obtained an appropriate DHCP IP address.

Verify that any one of your routers can ping the IP address of any other router.

Configuration
Step1 : Configure VTP mode Server , VTP domain CCNP and verify that all ports are trunk negotiated.

Task 2 : Configure the L2 vlan for all Vlan on SW1.
SW1#conf t
Enter configuration commands, one per line. End with CNTL/Z.

SW1(config)#vlan 2
SW1(config-vlan)#vlan 3
SW1(config-vlan)#vlan 4
SW1(config-vlan)#vlan 5
SW1(config-vlan)#

Task 3 : Verify that al ports connected to swith are 802.1Q trunk port . Configure the L3 vlan for all Vlan on SW1.

SW1(config)#ip routing

SW1(config)#!
SW1(config)#interface Vlan1
SW1(config-if)# ip address 1.1.1.11 255.255.255.0
SW1(config-if)#!
SW1(config-if)#interface Vlan2
SW1(config-if)# ip address 10.10.10.9 255.255.255.248
SW1(config-if)#!
SW1(config-if)#interface Vlan3
SW1(config-if)# ip address 10.10.10.33 255.255.255.248
SW1(config-if)#!
SW1(config-if)#interface Vlan4
SW1(config-if)# ip address 30.30.30.1 255.255.255.192
SW1(config-if)#!
SW1(config-if)#interface Vlan5
SW1(config-if)# ip address 20.20.20.97 255.255.255.224
SW1(config-if)#!
SW1(config-if)#
SW1#conf t

Enter configuration commands, one per line. End with CNTL/Z.
SW1(config)#int vlan 2
SW1(config-if)#no shut
SW1(config-if)#int vlan 3
SW1(config-if)#no shut
SW1(config-if)#int vlan 4
SW1(config-if)#no shut
SW1(config-if)#int vlan 5
SW1(config-if)#no shut
SW1(config-if)#^Z

Task 4 : Verify the L3 vlan for all Vlan on SW1.

Task 5 : Configure the Switch port on all switch who are connected to all four routers .
SW1(config)#int eth1/0
SW1(config-if)#switchport mode access
SW1(config-if)#switchport access vlan 2
SW1(config-if)#no shut
SW1(config)#int eth2/0
SW1(config-if)#switchport access vlan 2
SW1(config-if)# switchport mode access
SW1(config-if)# duplex auto
SW1(config-if)#end

SW2(config)#int eth1/0
SW2(config-if)#switchport mode access
SW2(config-if)#switchport access vlan 3
SW2(config-if)#int eth2/0
SW2(config-if)#switchport mode access
SW2(config-if)#switchport access vlan 3
SW2(config-if)#^Z
SW2(config)#int eth3/0
SW2(config-if)#switchport mode access
SW2(config-if)#switchport access vlan 5
SW2(config-if)#int eth4/0
SW2(config-if)#switchport mode access
SW2(config-if)#switchport access vlan 5
SW2(config-if)#^Z
SW3(config)#int eth3/0
SW3(config-if)#switchport mode access
SW3(config-if)#switchport access vlan 4
SW3(config-if)#int eth4/0
SW3(config-if)#switchport mode access
SW3(config-if)#switchport access vlan 4
SW3(config-if)#^Z

Task 6 : Configure the SW1 to make it as DHCP server .
SW1(config)#ip dhcp pool vlan2 SW1(dhcp-config)# network 10.10.10.8 255.255.255.248 SW1(dhcp-config)# default-router 10.10.10.9 SW1(dhcp-config)#!

SW1(dhcp-config)#ip dhcp pool vlan3 SW1(dhcp-config)# network 10.10.10.32 255.255.255.248 SW1(dhcp-config)# default-router 10.10.10.33

SW1(dhcp-config)#!

SW1(dhcp-config)#ip dhcp pool vlan4 SW1(dhcp-config)# network 30.30.30.0 255.255.255.192 SW1(dhcp-config)# default-router 30.30.30.1

SW1(dhcp-config)#!

SW1(dhcp-config)#ip dhcp pool vlan5 SW1(dhcp-config)# network 20.20.20.96 255.255.255.224

SW1(dhcp-config)# default-router 20.20.20.97

Task 7 : Configure the Routers so that it will take the ip address from DHCP server.
R1(config)#int range eth0/0-1
R1(config-if-range)#no shut
R1(config-if-range)#ip address dhcp
R2(config)#int range eth0/0-1
R2(config-if-range)#no s
R2(config-if-range)#ip address dhcp

R3(config)#int range eth0/0-1
R3(config-if-range)#no shut
R3(config-if-range)#ip address dhcp
R4(config)#int range eth0/0-1
R4(config-if-range)#no shut
R4(config-if-range)#ip address dhcp

Task 7 : Verification that All routers are able to get the Ip address