To locate where the active bridge instance is, you need to know where the active DLR control VM is running. This can be checked from Networking & Security | Installation | NSX Edges. In the center pane, double-click the desired NSX Edge DLR and go to Manage | Settings | Configuration. Under Logical Router Appliances, check the column Host and find the ESXi host hostname:
Verifying bridging can also be done ...