• DVS versions 5.5 and below in vSphere 6.7 
• DVS version 6.0 and below in vSphere 7.0

While upgrading vCenter Server to version 6.7 or 7.0 or 8.0, you see these symptoms:

The upgrade fails with below error:

• Source vCenter Server has instance(s) of Distributed Virtual Switch at unsupported version.

• In Installation log you see entries similar to:
• Distributed Virtual Switches with versions lower than 6.6.0 are not supported with vCenter Server 8.0. Upgrade these Distributed Switches to version 6.6.0 or later to be able proceed with the upgrade of vCenter Server. 

• Distributed Virtual Switches with versions lower than 6.5.0 are not supported with vCenter Server 7.0. Upgrade these Distributed Switches to version 6.5.0 or later to be able proceed with the upgrade of vCenter Server. 

OR

• Distributed Virtual Switches with versions lower than 6.0.0 are not supported with vCenter Server 6.7. Upgrade these Distributed Switches to version 6.0.0 or later to be able proceed with the upgrade of vCenter Server. 

OR

• Distributed Virtual Switches with versions lower than 6.6.0 are not supported with vCenter Server 8.0. Upgrade these Distributed Switches to version 6.6.0 or later to be able proceed with the upgrade of vCenter Server. 

• vCenter Server 6.7, all DVS(es) at version 5.5 or below have to be upgraded to version 6.0 or above
• vCenter Server 7.0, all DVS(es) at version 6.0 or below have to be upgraded to version 6.5 or above
• vCenter Server 8.0, all DVS(es) at version 6.5 or below have to be upgraded to version 6.6 or above

• vCenter Server Appliance: /var/log/vmware/upgrade/
• Windows vCenter Server: C:\Users\install_user\AppData\Local\Temp\vcsMigration

• Where DSwitch, DSwitch2 indicate names of the DVS’es that need to be upgraded and their current versions.
• The DVS Upgrade can be done from the vCenter User Interface or through the vCenter API.
  • Upgrade a vSphere Distributed Switch to a Later Version, click on the below link for more details:
    • 8.0
    • 7.0
    • 6.7
    • 6.5
    • 6.0