Dynamic Host Configuration Protocol (DHCP) Relay at Layer 2
Relay of DHCP traffic to DHCP server in different VLAN. Works with DHCP Option 82
The DHCP Address Allocation Using Option 82 feature provides the Dynamic Host Configuration Protocol (DHCP) server the ability to allocate dynamic IP addresses based on the relay information option (option 82) information sent by the relay agent.
Automatic DHCP address allocation is typically based on an IP address, whether it be the gateway address (giaddr field of the DHCP packet) or the incoming interface IP address. In some networks, it is necessary to use additional information to further determine which IP addresses to allocate. By using option 82, the relay agent has long been able to include additional information about itself when forwarding client-originated DHCP packets to a DHCP server. The DHCP Address Allocation Using Option 82 feature now allows the DHCP server to also use option 82 as a means to provide additional information to properly allocate IP addresses to DHCP clients.
In our case option 82 information includes which VLAN the DHCP request came from.
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