Implementing

                   +--+
                   |h4|
                   ++-+
                    |
                    |
+--+      +--+     ++-+     +--+
|h1+------+s1+-----+s3+-----+h3|
+--+      +-++     +--+     +--+
            |
            |
          +-++
          |s2|
          +-++
            |
            |
          +-++
          |h2|
          +--+

Introduction

How to run

Run the topology:

sudo p4run

Try to ping from one host to another:

mininet> h1 ping h2

Ping from all host pairs to test for connectivity:

mininet> pingall