Switch Services 5-13
5.2.4 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).
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.
NOTE: DHCP Server and relay can run on different switch VLAN interfaces.
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