DHCP on Switch Over VLAN

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 To configure DHCP on a VLAN in a Cisco switch, you need to create a DHCP pool, define the DHCP options, and assign the VLAN interface to the DHCP pool. Here are the steps to configure DHCP on a VLAN in a Cisco switch:

Assumptions:

  • You have already created a VLAN on the switch.
  • You have a DHCP server configured and reachable from the switch.

1. Access Configuration Mode:

  • Description: Access the switch's command-line interface (CLI) and enter configuration mode.
bash
Switch> enable
Switch# configure terminal

2. Create a DHCP Pool:

  • Description: Create a DHCP pool for the VLAN you want to configure. Replace vlan_id with the actual VLAN ID and specify the IP address range for the VLAN.
bash
Switch(config)# ip dhcp pool vlan_id
Switch(dhcp-config)# network network_address subnet_mask
  • Example:
bash
Switch(config)# ip dhcp pool 10
Switch(dhcp-config)# network 192.168.10.0 255.255.255.0

3. Define DHCP Options (Optional):

  • Description: You can define optional DHCP options like DNS servers, default gateway, and domain name if needed.
bash
Switch(dhcp-config)# default-router default_gateway
Switch(dhcp-config)# dns-server dns_server_ip
Switch(dhcp-config)# domain-name example.com
  • Example:
bash
Switch(dhcp-config)# default-router 192.168.10.1
Switch(dhcp-config)# dns-server 8.8.8.8
Switch(dhcp-config)# domain-name example.com

4. Assign the VLAN Interface to the DHCP Pool:

  • Description: Assign the VLAN interface to the DHCP pool you created.
bash
Switch(config)# interface vlan vlan_id
Switch(config-if)# ip dhcp server pool vlan_id
  • Example:
bash
Switch(config)# interface vlan 10
Switch(config-if)# ip dhcp server pool 10

5. Verify the DHCP Configuration:

  • Description: To verify the DHCP configuration on the switch, you can use the following command:
bash
Switch# show running-config | section dhcp
  • Description: This command displays the DHCP configuration section of the running configuration, allowing you to review your settings.

6. Save the Configuration:

  • Description: After configuring DHCP, be sure to save the configuration to the startup configuration to ensure it persists after a reboot.
bash
Switch# write memory

With these steps, you have configured DHCP on a VLAN in your Cisco switch.

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