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Migrating vSphere hosts from vSS to vDS (Walking Hosts over in production environment):
1) Create vDS with all its port groups will be needed.
2) Configure each port group and the used uplinks - in case of physical separation using different uplinks.
3) Configure each port group options (VLAN, traffic Shaping, etc.).
4) Migrate one or two pNICs from vSS on the first host to the vDS created, then create a VM Kernel port and assign it to its new port group in vDS in order to begin testing connectivity to that host and configuration of the created vDS. Repeat for each VM Kernel port group used on the vSS on that host. After testing is finished delete those temps or keep according to your need.
5) Migrate a VM or two to their port group on the vDS and test connectivity to them.
6) Begin migrating all VM Kernel ports from vSS to their corresponding port groups on the vDS.
7) Migrate the rest of VMs to their corresponding port groups on the vDS.
8) Migrate the rest of pNICs on the vSS to the vDS.
9) Remove vSS.
10) In case of different hosts configuration skip this step to step 11. After finishing the first host, you can migrate the rest of hosts vSSs by one shot using (Add Hosts to vDS) Wizard. You select each host’s pNICs and which dvuplink to put, VM Kernel ports and to which port group on vDS to migrate and the same for VMs. This will migrate the rest of VM infrastructure networking to vDS.
11) If the hosts are differently configured, repeat steps (4-9) to walk other hosts one by one from vSS to vDS.
12) in case you want to choose which dvuplink assigned to pNIC, you can add host without anything by using (Add Hosts to vDS) Wizard, select the host only, finish the wizard, select vDS tab in Networking page of the host, select (Manage Physical Adapters) and choose which dvuplink assigned to which pNIC. But by using that method, you have to repeat steps (4-9) to walk host over.
NOTE: vSS: vSphere Standard Switch, vDS: vSphere Distributed Switch, pNIC: Physical NIC.