Load Testing – IP Switching Load tests in Visual Studio Team System Test Edition provide development teams with a way to see how an application acts under various sorts of user load. IP switching configures a load test to simulate requests being made to an application from a range of IP addresses.  You can enable and disable IP switching for a load test scenario on the property sheet for that scenario. IP switching is enabled by default. IP switching is available only if you use a rig with a controller and one or more agents. To configure IP switching, use the Administer Test Controllers dialog box. For more information, see How To: Use IP Switching with Agents. Enabling IP switching for a load test