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DES-7200 Configuration Guide Chapter 5 DHCP Relay Configuration
5-2
different network segments. Therefore, one DHCP Server in a LAN can
implement the dynamic IP management for all network segments, that is, a
dynamic DHCP IP management in the Client - Relay Agent - Server mode.
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.
5.1.3 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. DES-7200 provides
two types of relay agent information. One is the relay agent information option
dot1x that is combined with the 802.1x application scheme, the other is relay
agent information option82 that is combined with the port VID, slot, port and