Here is a network topology which allow us to test our code for hierarchy

from mininet.net import Mininet
from mininet.node import Controller, RemoteController
from mininet.cli import CLI
from mininet.log import setLogLevel, info

def HierarchyTopology():

    net = Mininet( topo=None, build=False)

    info("***Create nodes***\n")
    h1 = net.addHost( 'h1', mac='01:00:00:00:01:00', ip='192.168.0.1/24' )
    h2 = net.addHost( 'h2', mac='01:00:00:00:02:00', ip='192.168.0.2/24' )

    info("***Create switches***\n")
    s0 = net.addSwitch( 's0', listenPort=6634, mac='00:00:00:00:00:01' )
    s1 = net.addSwitch( 's1', listenPort=6634, mac='00:00:00:00:00:02' )
    s2 = net.addSwitch( 's2', listenPort=6634, mac='00:00:00:00:00:03' )
    s3 = net.addSwitch( 's3', listenPort=6634, mac='00:00:00:00:00:04' )
    s4 = net.addSwitch( 's4', listenPort=6634, mac='00:00:00:00:00:05' )
    s5 = net.addSwitch( 's5', listenPort=6634, mac='00:00:00:00:00:06' )

    info("***Creating links***\n")
    net.addLink( h1,s0 )
    net.addLink( s0,s1 )
    net.addLink( s0,s2 )
    net.addLink( s1,s3 )
    net.addLink( s1,s4 )
    net.addLink( s2,s3 )
    net.addLink( s2,s4 )
    net.addLink( s3,s5 )
    net.addLink( s4,s5 )
    net.addLink( s5,h2 )

    info("***Add Controllers***")
    odl1 = net.addController( 'c1', controller=RemoteController, ip='192.168.103.142', port=6633)
    odl2 = net.addController( 'c2', controller=RemoteController, ip='192.168.103.143', port=6633)

    net.build()

    info("***Connect each switch to a different controller***")
    s0.start( [odl1] )
    s1.start( [odl1] )
    s2.start( [odl1] )
    s3.start( [odl2] )
    s4.start( [odl2] )
    s5.start( [odl2] )

    s1.cmdPrint('ovs-vsctl show')

    CLI( net )
    net.stop()

if __name__ == '__main__':
    setLogLevel( 'info' )
    HierarchyTopology()

• Check that machines ping each other

h1 ping h2
h2 ping h1

• Connect to odl1 controller : http://192.168.103.142:8181/index.html
• Connect to odl2 controller : http://192.168.103.143:8181/index.html

If you run mininet hierarchy topology with two separated controller instances, then h1 does no ping h2.