5-4Because a DHCP server can interact with a BOOTP client, you can use the DHCP server to assign anIP address to the BOOTP client, without needing to configure any BOOTP server.Configuring a DHCP/BOOTP ClientFollow these steps to configure a DHCP/BOOTP client:Operation Command DescriptionEnter system view system-view —Enter VLAN interface view interface Vlan-interfacevlan-id —Configure the VLAN interfaceto obtain IP address throughDHCP or BOOTPip address { bootp-alloc |dhcp-alloc }RequiredBy default, no IP address isconfigured for the VLANinterface.z Currently, an S3100 Ethernet switch functioning as the DHCP client can use an IP address for 24days at most. That is, the DHCP client can obtain an address lease for no more than 24 days eventhough the DHCP server offers a longer lease period.z An S3100 Ethernet switch functioning as a DHCP client supports default route creation. That is, theDHCP client creates a default route with the next hop being the gateway assigned by the DHCPserver. To view detailed information about the default route, run the display ip routing-tablecommand on the switch.To improve security and avoid malicious attack to the unused SOCKETs, S3100 Ethernet switchesprovide the following functions:z UDP 67 and UDP 68 ports used by DHCP are enabled only when DHCP is enabled.z UDP 67 and UDP 68 ports are disabled when DHCP is disabled.The specific implementation is:z Using the ip address dhcp-alloc command enables the DHCP client, and UDP port 68.z Using the undo ip address dhcp-alloc command disables the DHCP client, and UDP port 68.
