Operation Manual – DHCPH3C S5600 Series Ethernet Switches Chapter 2 DHCP Server Configuration2-5Caution:z When you merge two or more IRF systems into one IRF system, a new master unitis elected, and the new IRF system adopts new configurations accordingly. Thismay result in the existing system configurations (including the address poolsconfigured for the DHCP servers) being lost. As the new IRF system cannot inheritthe original DHCP server configurations, you need to perform DHCP serverconfigurations for it.z When an IRF system is split into multiple new IRF systems, some of the new IRFsystems may be degraded to Layer 2 devices. For a new IRF system degraded toLayer 2 device, although the original DHCP server still exists in the new system, itruns idle for being unable to receive any packets. When the IRF system restores toa Layer 3 device due to being merged into a new IRF system, it adopts theconfigurations on the new IRF system. And you need to perform DHCP serverconfigurations if the new IRF system does not have DHCP server-relatedconfigurations.z In an IRF system, the UDP HELPER function must be enabled on the DHCP serversthat are in fabric state.2.2 DHCP Server Configuration Task ListComplete the following tasks to configure the DHCP server:Task RemarksEnabling DHCP RequiredConfiguring the Global Address PoolBased DHCP ServerConfigureaddress poolbased DHCPserver Configuring the Interface AddressPool Based DHCP ServerOne of the two optionsis requiredConfiguring DHCP Server Security Functions OptionalConfiguring DHCP Accounting Functions OptionalEnabling the DHCP Server to Process Option 82 Optional2.3 Enabling DHCPYou need to enable DHCP to make other related configurations take effect.Follow these steps to enable DHCP:
