Brocade Mobility RFS7000-GR Controller System Reference Guide (Supporting software release 4.1.0.0-040GR and later) - Manual (Page 261)

Brocade Mobility RFS7000-GR Controller System Reference Guide 247
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DHCP server settings
5
Configuring the DHCP server relay
Refer to the Relay tab to view the current DHCP Relay configurations for available switch VLAN
interfaces. The Relay tab also displays the VLAN interfaces for which the DHCP Relay is
enabled/configured. The Gateway Interface address information is helpful in selecting the
interface suiting the data routing requirements between the External DHCP Server and DHCP client
(present on one of the switch’s available VLANs).
NOTE
DHCP Server and relay can run on different switch VLAN interfaces.
In the illustration above, a DHCP relay address has been configured on subnet 2 (The CLI
equivalent is “ip helper-address ”).
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: