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NV-1602S 16 Ports VDSL2 Managed IP DSLAM with Redundant Power USER'S MANUAL Ver.A2
The following figure is an example of DHCP Option 82:
If the DHCP relay feature is enabled on the switch, it forwards requests and replies between clients and servers when they are not
on the same physical subnet. Relay agent forwarding is different from the normal Layer 2 forwarding, in which IP datagrams are
switched transparently between networks. Relay agents receive DHCP messages and generate new DHCP messages to send on
output interfaces. So DHCP server can provide IP addresses to clients spanning multiple subnets instead of deploying a DHCP
server on every subnet.
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