Brocade Communications Systems RFS6000 System Reference Manual page 283

In the illustration above, a DHCP relay address has been configured on subnet 2 (The CLI
equivalent is
"ip helper-address <subnet1 External DHCP Server IP > <subnet1 Interface Name>"). When
configuring a DHCP Relay address, specify the other interface where the external DHCP Server can
be reached. In this example, that interface is subnet1. The DHCP relay agent must listen on both
subnet1 and subnet2. Consequently, the DHCP Server cannot run on either subnet1 or subnet2 (it
must be both).
However, you can run an onboard DHCP server on subnet3 to provide DHCP requests for clients in
subnet3. This is independent of the DHCP relay configuration. You cannot run onboard DHCP
Server on subnet1 to provide IP addresses to DHCP clients requesting IP addresses using DHCP
relay.
To view and configure DHCP relay information:
1. Select Services > DHCP Server from the main menu tree.
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