DVS-108 Series Managed Industrial Ethernet Switches User Manual DHCP L2 Relay Interface Configuration The interface which is connected to a DHCP server is a trusty interface; the interface which connected to DHCP client is an untrustful interface. Trusted port: (a) When a DHCP request packet with opt82 is received, it will be forwarded. (b) When a DHCP reply packet with opt82 is received, if the remote id is same as the switch’s id, the opt82 will be stripped and forwarded; if the remote id is not same as the switch’s id, it will be forwarded directly. (c) When a DHCP packet without opt82 is received, it will be dropped. Un-trusted Port:
(a) When a DHCP packet with opt82 is received, it will be dropped. (b) When a DHCP packet without opt82 is received, opt82 will be inserted and the packet will be forwarded. DHCP L2 Relay Configuration 3-20 Description Factory Default Remote ID String Enter the remote ID string for the circuit ID mode. This is a local identifier of the circuit from which a DHCP client-to-server packet is received. It can make sure that the DHCP relay responds to packets from the DHCP server to the correct circuit. None Description Factory Default Interface The interface number interface number