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The .topo file includes the login info of the machine that will run ONOS and Mininet. In this example, the test runs using two virtual machines with host IP, username, password, and driver that are defined for each of the Mininet and ONOS components. The <connect_order> tag is the connection order that TestON will execute. The <type> tag specifies which driver the component will use. The <args> tag is required in the Mininet component even if no arguments exist. In the .topo file, all tags are required, but driver specific tags may be reordered between the components tags.
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