Task
Configure a DHCP server to automatically assign IP addresses to clients in the LAN, so as to avoid IP address conflicts. The company has two departments, namely A and B, and the two departments are respectively in vlan10 and vlan20. The IP address, gateway, and DNS (202.103.224.68) can be automatically assigned from the DHCP server through a layer-3 switch, and they can also access each other. and has access to the Internet.
Task implementation
1. Configure DHCP service
Click the DHCP server in Packer Tracer, select the "DHCP" option under the "Configuration" tab in the pop-up window, and the window shown in the figure below will appear, then create two address pools, set the gateway, DNS server, and start IP address, subnet mask, etc., and enable the DHCP server.
2. Configure switch VLAN parameters
Step 1: Enable the Layer 3 switch router function.
Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#host s3560
s3560(config)#ip routing
Step 2: Establish vlan and assign ports.
s3560(config)#vlan 10
s3560(config-vlan)#name tech
s3560(config-vlan)#exit
s3560(config)#vlan 20
s3560(config-vlan)#name business
s3560(config-vlan)#exit
s3560(config)#int f0/10
s3560(config-if)#switch mode access
s3560(config-if)#switch access vlan 10
s3560(config-if)#exit
s3560(config)#int f0/20
s3560(config-if)#switch mode access
s3560(config-if)#switch access vlan 20
s3560(config-if)#exit
The third step is to configure the routing function of the Layer 3 switch port.
s3560(config)#int vlan10
s3560(config-if)#ip add 192.168.10.1 255.255.255.0
s3560(config-if)#no shutdown
s3560(config-if)#exit
s3560(config)#int vlan20
s3560(config-if)#ip add 192.168.20.1 255.255.255.0
s3560(config-if)#no shutdown
s3560(config-if)#exit
s3560(config)#int vlan1
s3560(config-if)#ip add 192.168.1.1 255.255.255.0
s3560(config-if)#no shutdown
s3560(config-if)#exit
3. Configure the switch DHCP relay service
Step 1: Configure the routing function of the Layer 3 switch port.
s3560(config)#int vlan10
s3560(config-if)#ip helper-address 192.168.1.100
s3560(config-if)#exit
s3560(config)#int vlan20
s3560(config-if)#p helper-address 192.168.1.100
s3560(config-if)#end
Step 2: Test the PC’s automatic address acquisition function