Configuration Guide DHCP Relay Configuration
VLAN 10 and VLAN 20 correspond with the 10.0.0.1/16 and 20.0.0.1/16
networks respectively, while the DHCP Server is located on the 30.0.0.1/16
network. To have a dynamic IP management on the 10.0.0.1/16 and 20.0.0.1/16
networks through the DHCP Server at 30.0.0.2, just enable the DHCP Relay
Agent on the device that functions as the gateway, and specify the IP address of
the DHCP Server to 30.0.0.2.
Understanding DHCP Relay Agent Information(option 82)
As specified in RFC3046, when a relay device performs DHCP relay, the
network information of the DHCP client can be indicated in detail by adding an
option, so that the DHCP server can assign users with IP addresses for different
privileges. RFC3046 specifies that the option is numbered 82, so it is also called
option82. This option can be divided into several sub-options. Currently, the
sub-options in frequent use are Circuit ID and Remote ID. Ruijie provides two
types of relay agent information. One is the relay agent information option dot1x
that is combined with the 802.1x/SAM application scheme, the other is relay
agent information option82 that is combined with the port VID, slot, port and
MAC address. Depicted below are the contents in the option, format, and typical
application schemes when the two schemes are used:
1. relay agent information option dot1x: This application scheme requires
combination of 802.1x authentication and Ruijie RG-SAM. RG-SAM assigns
different IP privileges to devices during 802.1x authentication. The device „s IP
privilege combiens with the ID of VLAN to which the DHCP client belongs to
form the Circuit ID sub-option. When DHCP relay is uploaded to the DHCP
server, combined with the configuration of the DHCP server, the DHCP relay
agent can assign IP addresses with different privileges to the users with
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