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EIGRP Manual Lab For this lesson, we're using out 3 previous networks and a designated router to simulate loopback interfaces. You'll learn how to launch a loopback interface, and learn what the interface reveals about routers, traffic relationships, and other network transaction activity. For example, you'll discover what range of ID's you can access and what can be learned from assigning an IP address during and how to bring the command back up and create a change through the loopback interface. Then we'll demonstrate how to include all the interfaces tested into EIGRP – absolutely fascinating!