When the switch is configured as a DHCP (Dynamic Host Configuration Protocol) relay agent, it forwards the DHCP request received from a client to the DHCP server. When doing so, the system sets the GIADDR field in the DHCP request packet to the primary IP address of the ingress VLAN (Virtual LAN). This means that the DHCP server that resides on a remote subnet allocates an IP address for the client in the primary subnet range.
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