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15-21

IP Routing Features

Configuring DHCP Relay

Minimum Requirements for DHCP Relay Operation

In order for the DHCP Relay agent to work, the following steps must be

completed:

1. DHCP Relay is enabled on the routing switch

2. A DHCP server is servicing the routing switch

3. IP Routing is enabled on the routing switch

4. There is a route from the DHCP server to the routing switch and back

5. An IP Helper address is configured on the routing switch, set to the IP

address of the DHCP server on the VLAN that is connected to the DHCP

Client.

Enabling DHCP Relay

To enable the DHCP Relay function for the routing switch, at the Config CLI

context level, enter the command:

HPswitch(config)# dhcp-relay

To disable the DHCP Relay function, enter the command:

HPswitch(config)# no dhcp-relay

Configuring a Helper Address

At the VLAN configuration CLI context level, enter the commands to add the

DHCP server’s IP address to the VLANs list. For example, to configure a helper

address for VLAN 1, enter these commands:

HPswitch(conf)# vlan 1

HPswitch(vlan-1)# ip helper-address <ip-addr>

To remove the DHCP server helper address, enter this command:

HPswitch(vlan-1)# no ip helper-address <ip-addr>

!Software.book Page 21 Thursday, October 10, 2002 6:10 PM

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