3Com Router 3000 Ethernet FamilyConfiguration Guide Chapter 9 DHCP Configuration3Com Corporation9-37Operation CommandClear conflict information of all addresspool reset dhcp server conflict allClear statistical information in DHCPserver reset dhcp server statistics9.6 DHCP Relay ConfigurationDHCP relay configuration tasks include:z Setting interfaces to operate in DHCP relay modez Specifying external DHCP server addressesz Configuring DHCP server load sharing from DHCP relayz Releasing DHCP client IP address from DHCP relayz Clearing DHCP relay information9.6.1 Setting Interfaces to Operate in DHCP Relay ModeWhen the router receives a DHCP packet with itself being the destination, the routerhandles the packet depending on the specified operating mode. When operating inDHCP server mode, the router forwards the packet to the local DHCP server; whenoperating in relay mode, the router forwards the packet to an external DHCP server.Perform the following configuration in interface view to have the current interfaceoperate in DHCP relay mode.Table 9-39 Set the current interface to operate in DHCP relay modeOperation CommandRelay DHCP packets to an externalDHCP server for address allocation dhcp select relayRestore the default undo dhcp selectNote:These commands must be performed on an Ethernet interface (subinterface), virtualEthernet interface, synchronous/asynchronous serial interface encapsulated with PPP,HDLC or frame relay, or E1 interface.Perform the following configuration in the system view to have the specified interfacesoperate in DHCP relay mode.
