DHCP1: Export-DhcpServer, Remove-DhcpServerInDC. DHCP2: Add-DhcpServerInDC, Import-DhcpServer.

Migrating a DHCP server ' s configuration together with its existing leases and reservations by PowerShell follows an export/unauthorize-then-authorize/import pattern across the two servers. On the source server, DHCP1, Export-DhcpServer captures the existing scopes, options, leases, and reservations into a migration file, which is what allows the existing leases and reservations to actually carry over to the replacement server. Remove-DhcpServerInDC is then run on DHCP1 to unauthorize it in Active Directory, which is what prevents DHCP1 from continuing to service client requests once DHCP2 is brought online, satisfying that specific migration requirement. On the target server, DHCP2, Add-DhcpServerInDC authorizes the new server in AD DS so it is permitted to lease addresses on the network, and Import-DhcpServer then applies the configuration file exported from DHCP1, causing DHCP2 to hand out the same address ranges as DHCP1 along with the existing leases and reservations that were captured during export. Add-DhcpServerv4Scope and Remove-DhcpServerv4Scope only create or delete an individual scope ' s address range and do not export, import, or preserve any existing lease or reservation data, so neither is part of this migration sequence. Therefore, DHCP1 requires Export-DhcpServer and Remove-DhcpServerInDC, while DHCP2 requires Add-DhcpServerInDC and Import-DhcpServer.