Chapter 3 Featured Functions allocate the IP address numbers according to the remote-ID sub-option or circuit ID sub-option. 5. A DHCP server responds to the switch via unicast. And the switch checks whether the remote-ID or circuit-ID in option-82 matches the value of the DHCP request, and makes sure it sends from the certificated DHCP server. Then it removes the information of option-82, and sends back to the interface on the switch which sends the DHCP request.
DHCP L2 Relay Global Configuration You can enable or disable a DHCP relay function, and configure the parameters of circuit ID sub-option (the interface ID on the switch which connects to the host) and remote ID sub-option (the MAC address of the host which sends DHCP request) in this page. DHCP L2 Relay Configuration DHCP L2 Relay VLAN Configuration 3-19 Description Factory Default DHCP L2 Relay Configuration Admin Mode Specify whether the global status of the DHCP relay is enabled. Enable: The DHCP relay function is enabled. Disable: The DHCP relay function is disabled. This is the default setting.
Disable Description Factory Default VLAN ID If you have added VLANs on the VLAN Configuration page, the VLANs can be shown in the VLAN ID column, and you can configure the DHCP L2 relay setting of each VLAN. 1 Admin Mode Specify whether the status of the DHCP relay is enabled on the VLAN: Enable: Enable the DHCP relay on the VLAN. You can configure the VLAN DHCP relay settings if the DHCP relay is globally disabled. But the settings do not take effect even if you have applied it. Disable: Disabled the DHCP relay on the VLAN. Disable Circuit ID Specify whether the DHCP relay agent information option (DHCP option 82) is enabled: Enable: Enable the relay agent information option.
Disable: Disable the relay agent information option. This is the default setting for default VLANs 1, 2, and 3. Disable