TP-Link T1600G-28PS Jetstream Smart Switches User Guide - Page 456
DHCP, Overview, Supported Features, DHCP Relay includes three features: Option 82
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Configuring DHCP Service 1 DHCP DHCP 1.1 Overview DHCP (Dynamic Host Configuration Protocol) is widely used to automatically assign IP addresses and other network configuration parameters to network devices, enhancing the utilization of IP address. 1.2 Supported Features The supported DHCP features of the switch include DHCP Server, DHCP Relay and DHCP L2 Relay. DHCP Server DHCP Server is used to dynamically assign IP addresses, default gateway and other parameters to DHCP clients. As the following figure shows, the switch acts as a DHCP server and assigns IP addresses to the clients. Figure 1-1 Application Scenario of DHCP Server Switch DHCP Server DHCP Clients DHCP Relay DHCP Relay is used to process and forward DHCP packets between different subnets or VLANs. DHCP clients broadcast DHCP request packets to require for IP addresses. Without this function, clients cannot obtain IP addresses from a DHCP server in the different LAN because the broadcast packets can be transmitted only in the same LAN. To equip each LAN with a DHCP server can solve this problem, but the costs of network construction will be increased and the management of central network will become inconvenient. A device with DHCP Relay function is a better choice. It acts as a relay agent and can forward DHCP packets between DHCP clients and DHCP servers in different LANs. Therefore, DHCP clients in different LANs can share one DHCP server. DHCP Relay includes three features: Option 82, DHCP Interface Relay and DHCP VLAN Relay. User Guide 431
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