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    How to configure DHCP Server on a switch for different VLANs?

    DHCP (Dynamic Host Configuration Protocol) servers provide all the basic information the client wants to operate on the network, including DNS address, Default Gateway, IP addresses, subnet masks, and many more in detail.

    In this lab, we have one switch and 16 PCs. Our task is to assign all the PCs to their VLANs and configure the DHCP server for all VLANs. Ultimately, ensure all the PCs get their IP addresses from the DHCP server.

    • configure the topology as per the diagram
    • configure VLAN 10,20,30, and 40
    • assign ports to their VLANs
    • configure IP addresses for VLANs
    • VLAN 10 192.168.1.1/24
    • VLAN 20 192.168.2.1/24
    • VLAN 30 192.168.3.1/24
    • VLAN 40 192.168.4.1/24
    • configure DHCP server for all VLANs
    • ensure that all PCs get IPs
    • verify with show commands
    • configure IP routing command
    SW-dhcp-(config)#vlan 10
    SW-dhcp-(config-vlan)#name vlan10
    SW-dhcp-(config-vlan)#exit
    SW-dhcp-(config)#vlan 20
    SW-dhcp-(config-vlan)#name vlan20
    SW-dhcp-(config-vlan)#exit
    SW-dhcp-(config)#vlan 30
    SW-dhcp-(config-vlan)#name vlan30
    SW-dhcp-(config-vlan)#exit
    SW-dhcp-(config)#vlan 40
    SW-dhcp-(config-vlan)#name vlan40
    SW-dhcp-(config-vlan)#exit
    SW-dhcp-(config)#interface range ethernet 0/0-3
    SW-dhcp-(config-if-range)#switchport
    SW-dhcp-(config-if-range)#switchport mode access
    SW-dhcp-(config-if-range)#switchport access vlan 10
    SW-dhcp-(config-if-range)#exit
    SW-dhcp-(config)#interface range ethernet 1/0-3
    SW-dhcp-(config-if-range)#switchport
    SW-dhcp-(config-if-range)#switchport mode access
    SW-dhcp-(config-if-range)#switchport access vlan 20
    SW-dhcp-(config-if-range)#exit

    SW-dhcp-(config)#interface range ethernet 2/0-3
    SW-dhcp-(config-if-range)#switchport
    SW-dhcp-(config-if-range)#switchport mode access
    SW-dhcp-(config-if-range)#switchport access vlan 30
    SW-dhcp-(config-if-range)#exit

    SW-dhcp-(config)#interface range ethernet 3/0-3
    SW-dhcp-(config-if-range)#switchport
    SW-dhcp-(config-if-range)#switchport mode access
    SW-dhcp-(config-if-range)#switchport access vlan 40
    SW-dhcp-(config-if-range)#exit

    SW-dhcp-#show vlan
    VLAN Name                             Status    Ports
    —- ——————————– ——— ——————————-
    1    default                          active
    10   vlan10                           active    Et0/0, Et0/1, Et0/2, Et0/3
    20   vlan20                           active    Et1/0, Et1/1, Et1/2, Et1/3
    30   vlan30                           active    Et2/0, Et2/1, Et2/2, Et2/3
    40   vlan40                           active    Et3/0, Et3/1, Et3/2, Et3/3

    SW-dhcp-(config)#interface vlan 10
    SW-dhcp-(config-if)#ip address 192.168.1.1 255.255.255.0
    SW-dhcp-(config-if)#no shutdown
    SW-dhcp-(config-if)#exit

    SW-dhcp-(config)#interface vlan 20
    SW-dhcp-(config-if)#ip address 192.168.2.1 255.255.255.0
    SW-dhcp-(config-if)#no shutdown
    SW-dhcp-(config-if)#exit

    SW-dhcp-(config)#interface vlan 30
    SW-dhcp-(config-if)#ip address 192.168.3.1 255.255.255.0
    SW-dhcp-(config-if)#no shutdown
    SW-dhcp-(config-if)#exit

    SW-dhcp-(config)#interface vlan 40
    SW-dhcp-(config-if)#ip address 192.168.4.1 255.255.255.0
    SW-dhcp-(config-if)#no shutdown
    SW-dhcp-(config-if)#exit
    SW-dhcp-(config)#end

    SW-dhcp-#show ip interface brief
    Interface              IP-Address      OK? Method Status                Protocol

    Vlan10                 192.168.1.1     YES manual up                    up
    Vlan20                 192.168.2.1     YES manual up                    up
    Vlan30                 192.168.3.1     YES manual up                    up
    Vlan40                 192.168.4.1     YES manual up                    up

    SW-dhcp-(config)#service dhcp
    SW-dhcp-(config)#ip dhcp pool vlan10
    SW-dhcp-(dhcp-config)#network 192.168.1.2 255.255.255.0
    SW-dhcp-(dhcp-config)#default-router 192.168.1.1
    SW-dhcp-(dhcp-config)#dns-server 8.8.8.8
    SW-dhcp-(dhcp-config)#exit

    SW-dhcp-(config)#service dhcp
    SW-dhcp-(config)#ip dhcp pool vlan20
    SW-dhcp-(dhcp-config)#network 192.168.2.2 255.255.255.0
    SW-dhcp-(dhcp-config)#default-router 192.168.2.1
    SW-dhcp-(dhcp-config)#dns-server 8.8.8.8
    SW-dhcp-(dhcp-config)#exit

    SW-dhcp-(config)#service dhcp
    SW-dhcp-(config)#ip dhcp pool vlan30
    SW-dhcp-(dhcp-config)#network 192.168.3.2 255.255.255.0
    SW-dhcp-(dhcp-config)#default-router 192.168.3.1
    SW-dhcp-(dhcp-config)#dns-server 8.8.8.8
    SW-dhcp-(dhcp-config)#exit

    SW-dhcp-(config)#service dhcp
    SW-dhcp-(config)#ip dhcp pool vlan40
    SW-dhcp-(dhcp-config)#network 192.168.4.2 255.255.255.0
    SW-dhcp-(dhcp-config)#default-router 192.168.4.1
    SW-dhcp-(dhcp-config)#dns-server 8.8.8.8
    SW-dhcp-(dhcp-config)#exit

    SW-dhcp-(config)#ip routing
    SW-dhcp-(config)#exit

    SW-dhcp-#show ip dhcp binding
    Bindings from all pools not associated with VRF:
    IP address      Client-ID/              Lease expiration        Type       State      Interface
    Hardware address/
    User name
    192.168.1.2     0100.5079.6668.00       Dec 15 2024 11:16 AM    Automatic  Active     Vlan10
    192.168.1.3     0100.5079.6668.01       Dec 15 2024 11:16 AM    Automatic  Active     Vlan10
    192.168.1.4     0100.5079.6668.02       Dec 15 2024 11:16 AM    Automatic  Active     Vlan10
    192.168.1.5     0100.5079.6668.03       Dec 15 2024 11:16 AM    Automatic  Active     Vlan10
    192.168.2.2     0100.5079.6668.04       Dec 15 2024 11:17 AM    Automatic  Active     Vlan20
    192.168.2.3     0100.5079.6668.05       Dec 15 2024 11:17 AM    Automatic  Active     Vlan20
    192.168.2.4     0100.5079.6668.06       Dec 15 2024 11:17 AM    Automatic  Active     Vlan20
    192.168.2.5     0100.5079.6668.07       Dec 15 2024 11:17 AM    Automatic  Active     Vlan20
    192.168.3.2     0100.5079.6668.0d       Dec 15 2024 11:17 AM    Automatic  Active     Vlan30
    192.168.3.3     0100.5079.6668.0c       Dec 15 2024 11:17 AM    Automatic  Active     Vlan30
    192.168.3.4     0100.5079.6668.0b       Dec 15 2024 11:17 AM    Automatic  Active     Vlan30
    192.168.3.5     0100.5079.6668.0a       Dec 15 2024 11:18 AM    Automatic  Active     Vlan30
    192.168.4.2     0100.5079.6668.14       Dec 15 2024 11:16 AM    Automatic  Active     Vlan40
    192.168.4.3     0100.5079.6668.15       Dec 15 2024 11:16 AM    Automatic  Active     Vlan40
    192.168.4.4     0100.5079.6668.16       Dec 15 2024 11:17 AM    Automatic  Active     Vlan40
    192.168.4.5     0100.5079.6668.17       Dec 15 2024 11:17 AM    Automatic  Active     Vlan40

    PC1> ip dhcp
    DDORA IP 192.168.1.2/24 GW 192.168.1.1
    PC1> show ip
    NAME        : PC1[1]
    IP/MASK     : 192.168.1.2/24
    GATEWAY     : 192.168.1.1
    DNS         : 8.8.8.8
    DHCP SERVER : 192.168.1.1
    DHCP LEASE  : 84926, 86400/43200/75600
    MAC         : 00:50:79:66:68:00
    LPORT       : 10018
    RHOST:PORT  : 127.0.0.1:10019
    MTU:        : 1500
    Updated on March 21, 2025

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