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#!/usr/bin/python3

# Example code for using the ryu module to do SDN (Software Defined Networking)

# Author: James Campbell

# Date Updated: 12-12-2015

# from http://ryu.readthedocs.org/en/latest/writing_ryu_app.html

from ryu.base import app_manager

from ryu.controller import ofp_event

from ryu.controller.handler import MAIN_DISPATCHER

from ryu.controller.handler import set_ev_cls

class L2Switch(app_manager.RyuApp):

def __init__(self, *args, **kwargs):

super(L2Switch, self).__init__(*args, **kwargs)

@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)

def packet_in_handler(self, ev):

msg = ev.msg

dp = msg.datapath

ofp = dp.ofproto

ofp_parser = dp.ofproto_parser

actions = [ofp_parser.OFPActionOutput(ofp.OFPP_FLOOD)]

out = ofp_parser.OFPPacketOut(

datapath=dp, buffer_id=msg.buffer_id, in_port=msg.in_port,

actions=actions)

dp.send_msg(out)