PLANET WGSW-52040 - Manual (Page 459)

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Global mode.
Usage Guide:
share-vlan may include many sub-vlan, but a sub-vlan only corresponds to a share-vlan. When layer 2 device of
DHCP Relay receive DHCP Request, firstly judge whether VLAN with layer 3 interface for receiving package. If there
is layer 3 interface in package, use the interface to process DHCP Relay, or else use layer 3 interface of share-vlan
to process DHCP Relay when the vlan is sub-vlan of share-vlan.
28.2.3 ip forward-protocol udp bootps
Command:
ip forward-protocol udp bootps
no ip forward-protocol udp bootps
Function:
Sets DHCP relay to forward UPD broadcast packets on the port; the “no ip forward-protocol udp
bootps”command cancels the service.
Parameter:
bootps forwarding UDP port as 67 DHCP broadcast packets.
Default:
Not forward UPD broadcast packets by default.
Command mode:
Global Mode
Usage Guide:
The forwarding destination address is set in the “ip helper-address” command and described later.
Example:
Setting DHCP packets to be forwarded to 192.168.1.5.
Switch(config)#ip forward-protocol udp boots
Switch(config)#interface vlan 1
Switch(Config-if-Vlan1)#ip helper-address 192.168.1.5