Operation Manual – DHCPH3C S5600 Series Ethernet Switches Chapter 6 DHCP/BOOTP Client Configuration6-2Note:Because a DHCP server can interact with a BOOTP client, you can use the DHCPserver to assign an IP address to the BOOTP client, without needing to configure anyBOOTP server.6.3 Configuring a DHCP/BOOTP ClientFollow these steps to configure a DHCP/BOOTP client:To do… Use the command… RemarksEnter system view system-view —Enter VLAN interface view interface vlan-interfacevlan-id —Configure the VLANinterface to obtain IPaddress through DHCP orBOOTPip address { bootp-alloc| dhcp-alloc }RequiredBy default, no IP addressis configured for the VLANinterface.Note:z Currently, an S5600 Ethernet switch functioning as the DHCP client can use an IPaddress for 24 days at most. That is, the DHCP client can obtain an address leasefor no more than 24 days even though the DHCP server offers a longer lease period.z If a switch belongs to an IRF fabric, you need to enable the UDP Helper function onthe switch before configuring its VLAN interfaces to obtain IP addresses throughDHCP.Note:To improve security and avoid malicious attack to the unused SOCKETs, S5600Ethernet switches provide 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 UDPport 68.z Using the undo ip address dhcp-alloc command disables the DHCP client, andUDP port 68.
