The unique ID selection criteria is used when assigning tags to Virtual Machines on active standby deployments.

About this task

Unique ID is used by the NSX Manager when a Virtual Machine (VM) goes from standby to active deployment. The unique ID can be based on VM instance UUID, VM BIOS UUID, or VM name or a combination of these options. Note that if the criteria changes (such as a VM name changes) after universal security tags have been created and attached to VMs, the security tag must be detached and reattached to the VMs.


  1. In the vSphere Web Client, navigate to Home > Networking & Security > Installation, select the Management tab.
  2. Click the primary NSX Manager. Then select Actions > Unique ID Selection Criteria.
  3. Select one or more of the unique ID options:
    • Use Virtual Machine instance UUID (recommended) - The VM instance UUID is generally unique within a VC domain, however there are exceptions such as when deployments are made through snapshots. If the VM instance UUID is not unique we recommend you use the VM BIOS UUID in combination with the VM name.

    • Use Virtual Machine BIOS UUID - The BIOS UUID is not guaranteed to be unique within a VC domain, but it is always preserved in case of disaster. We recommend you use BIOS UUID in combination with VM name.

    • Use Virtual Machine Name - If all of the VM names in an environment are unique, then VM name can be used to identify a VM across vCenters. We recommend you use VM name in combination with VM BIOS UUID.

  4. Click OK.

What to do next

Next, create security tags.