If the topology of your NSX-V environment is not one of the supported fixed topologies, you can migrate using the user-defined topology option. You must also use this option if you want to migrate the NSX-V Load Balancer to the NSX-T Advanced Load Balancer, or to migrate a cross-vCenter environment to NSX Federation.

When migrating a user-defined topology, you can do an end-to-end migration or a lift-and-shift migration (see Migration Modes).

In a lift-and-shift migration, the default segments in NSX-T do no support DHCP servers and will result in the servers being down after migration.