614 CHAPTER 58: DHCP RELAY AGENT CONFIGURATIONEnabling DHCP Make sure to enable DHCP before you perform other DHCP relay agent-relatedconfigurations, since other DHCP-related configurations cannot take effect withDHCP disabled.Configuring an Interfaceto Operate in DHCPRelay Agent ModeWhen an interface operates in the relay mode, the interface forwards the DHCPpackets received from DHCP clients to an external DHCP server, which assigns IPaddresses to the DHCP clients.To enhance reliability, you can set multiple DHCP servers on the same network.These DHCP servers form a DHCP server group. When the interface establishesmapping relationship with the DHCP server group, the interface forwards theDHCP packets to all servers in the server group.Configure a DHCP relay agent to broadcastresponses to clientsOptional “Configuring aDHCP Relay Agentto BroadcastResponses toClients” on page615Specify gateways for DHCP clients Optional “SpecifyingGateways for DHCPClients” on page615Specify source IP address of uplink packets Optional “Specifying theSource IP Addressof Uplink Packets”on page 616Configure DHCP relay agent security functions Optional “Configuring DHCPRelay AgentSecurity Functions”on page 617Configure Option 82 support Optional “ConfiguringOption 82 Support”on page 619Table 481 DHCP relay agent configuration tasksConfiguration task Description Related sectionTable 482 Enable DHCPOperation Command DescriptionEnter system view system-view -Enable DHCP dhcp enable RequiredBy default, DHCP is enabledTable 483 Configure an interface to operate in DHCP relay agent modeOperation Command DescriptionEnter system view system-view -Configure the DHCP server IPaddress(es) in a specifiedDHCP server groupdhcp-server groupNo ipip-address&<1-8>RequiredBy default, no DHCP server IPaddress is configured in aDHCP server group
