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DES-7200 Configuration Guide Chapter 5 DHCP Relay Configuration
5-5
time, the DHCP response message received from the DHCP server will also be
forwarded to the DHCP Client.
The IP address of the DHCP server can either be configured globally or on the
layer 3 interface. Up to 20 IP addresses can be configured for the DHCP server
in every mode. When the DHCP request message is received from an interface,
the DHCP server of the interface is first used. If no DHCP server is configured
on the interface, the DHCP server globally configured will be used.
The DHCP supports vrf-based relay function by adding the vtf parameter to the
IP address of the DHCP server.
To configure the IP address of the DHCP server, exeute the following
commands in the global configuration mode:
Command Function
DES-7200(config)# ip helper-address
[vrf {vrf-name} | global] A.B.C.D
Configure the IP address of the DHCP
server globally.
DES-7200(config-if)# ip helper-address
[vrf {vrf-name} | global] A.B.C.D
Configure the IP address of the DHCP
server on the interface. This command
must be set on the layer-3 interface.
DES-7200(config)# no IP
helper-address [vrf {vrf-name} | global]
A.B.C.D
Delete the globally configured IP address
of the DHCP server.
DES-7200(config-if)# no IP
helper-address [vrf {vrf-name} | global]
A.B.C.D
Delete the IP address of the DHCP server
configured on the interface.
5.2.3 Configuring DHCP
option dot1x
Description in Understanding the DHCP Relay Agent Information shows that we
can configure ip dhcp relay information option dot1x to enable the option
dot1x function of the DHCP relay when you need to assign the IP addresses
with different privileges to the users of different privileges. When this function is
enabled, the device will work with 802.1x to add corresponding option
information to the DHCP server when it relays. This function should be used
with the dot1x function.
To configure DHCP option dot1x, execute the following commands in the global
configuration mode:
Command Function