Optimal automatic switching of access lines using SDN
$ sudo python3 ./my_topology.py
$ ryu-manager --verbose ./controller.py
- [] forward what is received on eth1 to eth2 and eth2 to eth1. s3 lo: s3-eth1:s1-eth1 s3-eth2:s2-eth1 s4 lo: s4-eth1:s1-eth2 s4-eth2:s2-eth2 s5 lo: s5-eth1:s1-eth3 s5-eth2:s2-eth3