title: Mininet pingall fails
body: <p>I am to Mininet and I am trying to set up a VLAN. It has four host h1, h2, h3, and h4 connected to one switch. I want h1 and h3 on VLAN 100 and h2 and h4 on VLAN 200. I am having trouble with writing the code under runExperiment. I updated my code where I can manually ping h1 to h3 successfully and h2 to h4 successfully. However, when it comes to the pingall command, I don't get any ping connectivity.
  <a href="https://i.stack.imgur.com/LUiED.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LUiED.png" alt="Output"></a></p>
  
  <p>I also included my <a href="https://drive.google.com/file/d/1SkdXXTY4uBoBupWoUBlEBsi2x1g811oA/view?usp=sharing" rel="nofollow noreferrer">file</a> of the Mininet topology. </p>