The elastic virtual switches and their resources are logically grouped together. Each logical group is called a tenant. The defined resources for the elastic virtual switch within a tenant are not visible outside that tenant's namespace. The tenant acts as a container to hold all the tenant's resources together. For more information about how to create an elastic virtual switch with a tenant, see How to Configure an Elastic Virtual Switch.
You do not need to specify the tenant name for any EVS operation. The default tenant name is sys-global and all the EVS operations occur in this namespace.