topo.sh: mininet topology laucher

ryu_exe.sh: Ryu controller laucher

line_topo.py: mininet topology geneter

compact.py: the target Ryu application

mapping.py: the file included by compact.py, recording some configuration

mapping.log: log file generated by mapping.py

this application will match the ping flow between hosts,

at the ingress switch, they match src_ip, dst_ip, src_mac, dst_mac, ip protocol of the ping packet

if matched, packets will be inserted a vlan tag

then in the following routing, switches just need to match this specific vlan ID and then forwarding

at egress switch, the vlan tag will be remove before packets are sent to the host