Operation Manual – DHCPH3C S7500E Series Ethernet Switches Chapter 3 DHCP Relay Agent Configuration3-6To do… Use the command… RemarksEnter system view system-view —Configure the DHCP relay agent tosend a DHCP-RELEASE requestdhcp relay release ipclient-ip Required3.3.5 Configuring the DHCP Relay Agent Security FunctionsI. Creating static bindings and enable IP address checkThe DHCP relay agent can dynamically record clients’ IP-to-MAC bindings after clientsget IP addresses. It also supports static bindings, which means you can manuallyconfigure IP-to-MAC bindings on the DHCP relay agent, so that users can accessexternal network using fixed IP addresses.For avoidance of invalid IP address configuration, you can configure the DHCP relayagent to check whether a requesting client’s IP and MAC addresses match a binding onit (both dynamic and static bindings). If not, the client cannot access outside networksvia the DHCP relay agent.Follow these steps to create a static binding and enable IP address check:To do… Use the command… RemarksEnter system view system-view —Create a static bindingdhcp relay security staticip-address mac-address[ interface interface-typeinterface-number ]OptionalNo static binding iscreated by default.Enter interface view interface interface-typeinterface-number —Enable invalid IPaddress checkdhcp relay address-check{ disable | enable }RequiredDisabled by default.
