title: How can we add flows to switches to ping hosts in OpenFlow Manager when we have duplicate paths?
body: <p>I'm working with Mininet and OpendayLight controller, my topologie is like this :</p>
  <pre><code>h1 _ s1 ____ s2 _ h2 
        |      |
        +  s3  +
  </code></pre>
  <p>(s1, s2, and s3 are connected with each other, h1 is connected to s1, and h2 to s2).</p>
  <p>I'm using Openflow Manager app, and and I want to <code>ping</code> h1 and h2, how can I add flows to each switch to do that?</p>
  <p>(I've tried to specify the output port for each switch depending on a specific path that i want, but it doesn't work.)</p>