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Configuring DHCP Relay DHCP Relay Implementation
OmniSwitch 6600 Family Network Configuration Guide April 2006 page 18-9
DHCP Relay Implementation
The OmniSwitch allows you to configure the DHCP Relay feature in one of two ways. You can set up a
global DHCP request or you can set up the DHCP Relay based on the VLAN of the DHCP request. Both
of these choices provide the same configuration options and capabilities. However, they are mutually
exclusive. The following matrix summarizes the options.
Global DHCP
For the global DHCP service, you must identify an IP address for the DHCP server.
Setting the IP Address
The DHCP Relay is automatically enabled on a switch whenever a DHCP server IP address is defined by
using the ip helper address command. There is no separate command for enabling or disabling the relay
service. You should configure DHCP Relay on switches where packets are routed between IP networks.
The following command defines a DHCP server address:
-> ip helper address 125.255.17.11
The DHCP Relay forwards BOOTP/DHCP broadcasts to and from the specified address. If multiple
DHCP servers are used, one IP address must be configured for each server. You can configure up to 256
addresses for each relay service.
To delete an IP address, use the no form of the ip helper address command. The IP address specified
with this syntax will be deleted. If an IP address is not specified with this syntax, then all IP helper
addresses are deleted. The following command deletes an IP helper address:
-> ip helper no address 125.255.17.11
Per-VLAN DHCP Relay Global DHCP Relay Effect
Disabled Disabled DHCP Request is flooded within its VLAN
Disabled Enabled DHCP Request is relayed to the Global Relay
Enabled Disabled DHCP Request is relayed to the Per-VLAN Relay
Enabled Enabled N/A