TP-Link T1600G-18TSTL-SG2216 T1600G-18TSUN V1 Configuration Guide - Page 431
uses IP address of the default agent interface 192.168.2.1/24 to apply for IP addresses
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Configuring DHCP DHCP In DHCP VLAN Relay, you can simply specify a layer 3 interface as default agent interface for all VLANs. The swith will fill this default agent interface's IP address in the relay agent IP address field of the DHCP packets from all VLANs. As the following figure shows, no IP addresses are assigned to VLAN 10 and VLAN 20, but a default relay agent interface is configured with the IP address 192.168.2.1/24. The switch uses IP address of the default agent interface (192.168.2.1/24) to apply for IP addresses for clients in both VLAN 10 and VLAN 20. As a result, the DHCP server will assign IP addresses on 192.168.2.0/24 (the same subnet with the IP address of the default agent interface) to clients in both VLAN 10 and VLAN 20. Figure 1-3 Application Scenario of DHCP VLAN Relay DHCP Server DHCP Clients VLAN 10 192.168.2.0/24 DHCP Relay Default Agent Interface: 192.168.2.1/24 DHCP Clients VLAN 20 192.168.2.0/24 Note: • If the VLAN already has an IP address, the switch will use the IP address of the VLAN as the relay agent IP address. The default relay agent IP address will not take effect. • A routed port or port channel interface is not associated with a particular VLAN. DHCP VLAN relay will not work on routed ports or port channel interfaces. Configuration Guide 408
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