2-4z When you merge two or more XRN systems into one XRN system, a new master unit is elected,and the new XRN system adopts new configurations accordingly. This may result in the existingsystem configurations (including the address pools configured for the DHCP servers) being lost. Asthe new XRN system cannot inherit the original DHCP server configurations, you need to performDHCP server configurations for it.z When an XRN system is split into multiple new XRN systems, some of the new XRN systems maybe degraded to Layer 2 devices. For a new XRN system degraded to Layer 2 device, although theoriginal DHCP server still exists in the new system, it runs idle for being unable to receive anypackets. When the XRN system restores to a Layer 3 device due to being merged into a new XRNsystem, it adopts the configurations on the new XRN system. And you need to perform DHCPserver configurations if the new XRN system does not have DHCP server-related configurations.z In an XRN system, the UDP HELPER function must be enabled on the DHCP servers that are infabric state.DHCP Server Configuration Task ListComplete the following tasks to configure the DHCP server:Task RemarksEnabling DHCP RequiredConfiguring the Global Address Pool BasedDHCP ServerConfigure addresspool based DHCPserver Configuring the Interface Address Pool BasedDHCP ServerOne of the two options isrequiredConfiguring DHCP Server Security Functions OptionalConfiguring DHCP Accounting Functions OptionalEnabling the DHCP Server to Process Option 82 OptionalEnabling DHCPYou need to enable DHCP to make other related configurations take effect.Follow these steps to enable DHCP:To do… Use the command… RemarksEnter system view system-view —Enable DHCP dhcp enable OptionalBy default, DHCP is enabled.
