HP ProCurve Series 6120 Blade Switches Multicast and Routing Guide

IP Routing Features
Configuring DHCP Relay
Operating Notes
■ If the configured BOOTP gateway address becomes invalid, the DHCP
relay agent returns to the default behavior (assigning the lowest-
numbered IP address).
■ If you try to configure an IP address that is not assigned to that interface,
the configuration will fail and the previously configured address (if there
is one) or the default address is used.
Configuring an IP Helper Address
To add the IP address of a DHCP server for a specified VLAN on a routing
switch, enter the ip helper-address command at the VLAN configuration level
as in the following example:
ProCurve(config)# vlan 1
ProCurve(vlan-1)# ip helper-address <ip-addr>
To remove the DHCP server helper address, enter the no form of the
command:
ProCurve(vlan-1)# no ip helper-address < ip-addr >
Operating Notes
■ You can configure up to 4000 IP helper addresses on a routing switch. The
helper addresses are shared between the DHCP relay agent and UDP
forwarder feature.
■ A maximum of sixteen IP helper addresses is supported in each VLAN.
Verifying the DHCP Relay Configuration
Displaying the DHCP Relay Setting
Use the show config command (or show running for the running-config file) to
display the current DHCP Relay setting.
3-45