- Save the mininet script given below as pathmap_test.py and run the mininet script in the mininet environment where Mininet is installed.
- Create topology using the below mininet script:
from mininet.topo import Topo
class MyTopo( Topo ):
"Simple topology example."
def __init__( self ):
"Create custom topo."
# Initialize topology
Topo.__init__( self )
# Add hosts and switches
leftHost = self.addHost( 'h1' )
rightHost = self.addHost( 'h2' )
leftSwitch = self.addSwitch( 's1' )
middleSwitch = self.addSwitch( 's2' )
middleSwitch2 = self.addSwitch( 's4' )
rightSwitch = self.addSwitch( 's3' )
# Add links
self.addLink( leftHost, leftSwitch )
self.addLink( leftSwitch, middleSwitch )
self.addLink( leftSwitch, middleSwitch2 )
self.addLink( middleSwitch, rightSwitch )
self.addLink( middleSwitch2, rightSwitch )
self.addLink( rightSwitch, rightHost )
topos = { 'mytopo': ( lambda: MyTopo() ) } mininet> net
c0
s1 lo: s1-eth1:h1-eth0 s1-eth2:s2-eth1 s1-eth3:s4-eth1
s2 lo: s2-eth1:s1-eth2 s2-eth2:s3-eth1
s3 lo: s3-eth1:s2-eth2 s3-eth2:s4-eth2 s3-eth3:h2-eth0
s4 lo: s4-eth1:s1-eth3 s4-eth2:s3-eth2
h1 h1-eth0:s1-eth1
h2 h2-eth0:s3-eth3
- Generate traffic by pinging between hosts h1 and h2 before creating the portmaps respectively
mininet> h1 ping h2
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
From 10.0.0.1 icmp_seq=1 Destination Host Unreachable
From 10.0.0.1 icmp_seq=2 Destination Host Unreachable
From 10.0.0.1 icmp_seq=3 Destination Host Unreachable
From 10.0.0.1 icmp_seq=4 Destination Host Unreachable
