HP 6120XG HP ProCurve Series 6120 Blade Switches Multicast and Routing Guide - Page 91

Operating Notes, Configuring an IP Helper Address, Verifying the DHCP Relay Configuration

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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 lowestnumbered 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 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

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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.
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