3Com Switch 8800 Configuration Guide Chapter 13 DHCP Configuration13-22z After receiving the packet, the DHCP server generates configuration informationaccordingly and sends it to the DHCP client through the DHCP Relay to completethe dynamic configuration of the DHCP client.Note that the entire configuration procedure may goes through multiples times of suchinteractions.13.4.2 Configuring DHCP RelayDHCP Relay configuration includes the following: The following text describes theDHCP Relay configuration tasks:z Configuring a DHCP server for a VLAN interfacez Configure user address entries for a DHCP Serverz Enable/Disable DHCP security on a VLAN interfacez Enabling/Disabling fake DHCP server detectingI. Configuring a DHCP server for a VLAN interfaceYou can execute the ip relay address command to configure the DHCP packetprocessing mode on VLAN interface as relay and a corresponding DHCP server for aVLAN interface.Perform the following configuration in VLAN interface view.Table 13-33 Configure a corresponding DHCP server for a VLAN interfaceOperation CommandConfigure a corresponding DHCP serverfor current VLAN interface ip relay address ip_addressRemove the DHCP server configured forcurrent VLAN interfaceundo ip relay address { ip_address |all }No DHCP server is configured for a VLAN interface by default.Note that when configuring a new DHCP server for a VLAN that already has a DHCPserver configured for it, the newly configured one does not overwrite the existing ones.Both the new and the old ones are valid. You can configure up to 20 DHCP serveraddresses for a VLAN interface.II. Configure user address entries for a DHCP ServerIn a VLAN that has DHCP Relay configured, to enable a DHCP client using a legal fixedIP address to pass the address checking of the DHCP security feature, you must add astatic address entry for the DHCP client. A static address entry indicates the relationbetween a fixed IP address and a MAC address.Perform the following configuration in system view.
