Principles of the DHCP relay feature

Dynamic Host Configuration Protocol (DHCP) relay includes Layer 2 relay and Layer 3 relay.
If the access device between a DHCP client and the DHCP server is only a bridge device on which the route forwarding function is unavailable or disabled, the DHCP Layer 2 relay function can implement transparent transmission of DHCP packets and the route forwarding function does not need to be configured. Only after the option 82 function is enabled, the DHCP relay device processes the packets, that is, adding or removing option 82 from the received DHCP packets.
The DHCP Layer 3 relay function can forward DHCP packets across network segments, so that DHCP clients can obtain dynamically allocated IP addresses from DHCP servers on other networks. Access devices can implement DHCP server configuration through a server group. A DHCP server group includes one or more DHCP servers. Access devices select a DHCPv4 server group in 3 DHCP relay modes, including the standard mode, option 60 mode, and MAC address mode.
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