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DHCP Relay Implementation Configuring DHCP Relay
page 18-10 OmniSwitch 6600 Family Network Configuration Guide April 2006
Per-VLAN DHCP
For the Per-VLAN DHCP service, you must identify the number of the VLAN that makes the relay
request.
Identifying the VLAN
You may enter one or more server IP addresses to which packets will be sent from a specified VLAN. Do
this by using the ip helper address vlan command. The following syntax will identify the IP address
125.255.17.11 as the DHCP server for VLAN 3.
-> ip helper address 125.255.17.11 vlan 3
The following syntax identifies two DHCP servers for VLAN 4 at two different IP addresses.
-> ip helper address 125.255.17.11 125.255.18.11 vlan 4
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 helper address for IP address 125.255.17.11:
-> ip helper no address 125.255.17.11
The following command deletes all IP helper addresses:
-> ip helper no address
Configuring BOOTP/DHCP Relay Parameters
Once the IP address of the DHCP server(s) is defined and the DHCP Relay is configured for either Global
DHCP request or Per-VLAN DHCP request, you can set the following optional parameter values to
configure BOOTP relay.
• The IP address to the DHCP server.
• The forward delay time.
• The hop count.
• The relay forwarding option.
The only parameter that is required for BOOTP relay is the IP address to the DHCP server or to the next
hop to the DHCP server. The default values can be accepted for forward delay, hop count, and relay
forwarding option.
Alternately the relay function may be provided by an external router connected to the switch; in this case,
the relay would be configured on the external router.