Cisco iphelper commands

Command Purpose

Step 1 configure terminal Enter global configuration mode.

Step 2 interface vlan vlan-id Create a switch virtual interface by entering a VLAN ID, and enter interface configuration mode.

Step 3 ip address ip-address subnet-mask Configure the interface with an IP address and an IP subnet.

Step 4 ip helper-address address Specify the DHCP packet forwarding address. The helper address can be a specific DHCP server address, or it can be the network address if other DHCP servers are on the destination network segment. Using the network address enables other servers to respond to DHCP requests. If you have multiple servers, you can configure one helper address for each server.

Step 5 exit Return to global configuration mode.

Step 6 interface range port-range or interface interface-id Configure multiple physical ports that are connected to the DHCP clients, and enter interface range configuration mode. or Configure a single physical port that is connected to the DHCP client, and enter interface configuration mode.

Step 7 switchport mode access Define the VLAN membership mode for the port.

Step 8 switchport access vlan vlan-id Assign the ports to the same VLAN as configured in Step 2.

Step 9 end Return to privileged EXEC mode.

Step 10 show running-config Verify your entries.

Step 11 copy running-config startup-config (Optional) Save your entries in the configuration file.

To remove the DHCP packet forwarding address, use the no ip helper-address address interface configuration command.

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