Hosts migration from vCenter 5.5 to vCenter 6 with DVS

Hi guys

Appreciated if you can point me write-ups or link that will guide me to migration of hosts from vCenter 5.5. to vCenter 6 with DVS.

I already setup new vCenter Server 6 on a new environment with new management network different from my existing.

On a high level I'm thinking of:

     1. Existing hosts management network should be routed to the new vCenter 6 management network.

     2. Export ALL DVS CONFIGURATION from vCenter 5.5

     3, Import ALL DVS CONFIGURATION to new vCenter 6

     4. Create Clusters on the new vCenter 6

     5. Disconnect ESXi host from vCenter 5.5

     6. Add ESXi to vCenter 6

     7. Migrate other remaining hosts

Let me know if there would be downtime on this process.

thanks.