2019 SDN上机第5次作业

1.浏览RYU官网学习RYU控制器的安装和RYU开发入门教程，提交你对于教程代码的理解，包括但不限于：

描述官方教程实现了一个什么样的交换机功能？

答：官方教程实现了一个将接收到的数据包发送到所有端口的交换机功能

控制器设定交换机支持什么版本的OpenFlow？

答：OpenFlow 1.0

控制器设定了交换机如何处理数据包？

答：接收包并广播包

2.根据官方教程和提供的示例代码（SimpleSwitch.py），将具有自学习功能的交换机代码（SelfLearning.py）补充完整

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

from ryu.ofproto import ofproto_v1_0

from ryu.lib.mac import haddr_to_bin

from ryu.lib.packet import packet

from ryu.lib.packet import ethernet

from ryu.lib.packet import ether_types

class SimpleSwitch(app_manager.RyuApp):

    # TODO define OpenFlow 1.0 version for the switch

    OFP_VERSIONS = [ofproto_v1_0.OFP_VERSION]

    # add your code here

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

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

        self.mac_to_port = {}

    def add_flow(self, datapath, in_port, dst, src, actions):

        ofproto = datapath.ofproto

        match = datapath.ofproto_parser.OFPMatch(

                in_port=in_port,

                dl_dst=haddr_to_bin(dst), dl_src=haddr_to_bin(src))

        mod = datapath.ofproto_parser.OFPFlowMod(

                datapath=datapath, match=match, cookie=0,

                command=ofproto.OFPFC_ADD, idle_timeout=0, hard_timeout=0,

                priority=ofproto.OFP_DEFAULT_PRIORITY,

                flags=ofproto.OFPFF_SEND_FLOW_REM, actions=actions)

        # TODO send modified message out

        datapath.send_msg(mod)

        # add your code here

    @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)

    def _packet_in_handler(self, ev):

        msg = ev.msg

        datapath = msg.datapath

        ofproto = datapath.ofproto

        pkt = packet.Packet(msg.data)

        eth = pkt.get_protocol(ethernet.ethernet)

        if eth.ethertype == ether_types.ETH_TYPE_LLDP:

            # ignore lldp packet

            return

        if eth.ethertype == ether_types.ETH_TYPE_IPV6:

            # ignore ipv6 packet

            return

        dst = eth.dst

        src = eth.src

        dpid = datapath.id

        self.mac_to_port.setdefault(dpid, {})

        self.logger.info("packet in DPID:%s MAC_SRC:%s MAC_DST:%s IN_PORT:%s", dpid, src, dst, msg.in_port)

        # learn a mac address to avoid FLOOD next time.

        self.mac_to_port[dpid][src] = msg.in_port

        if dst in self.mac_to_port[dpid]:

            out_port = self.mac_to_port[dpid][dst]

        else:

            out_port = ofproto.OFPP_FLOOD

        # TODO define the action for output

        actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]

        # add your code here

        # install a flow to avoid packet_in next time

        if out_port != ofproto.OFPP_FLOOD:

            self.logger.info("add flow s:DPID:%s Match:[ MAC_SRC:%s MAC_DST:%s IN_PORT:%s ], Action:[OUT_PUT:%s] ", dpid, src, dst, msg.in_port, out_port)

            self.add_flow(datapath, msg.in_port, dst, src, actions)

        data = None

        if msg.buffer_id == ofproto.OFP_NO_BUFFER:

            data = msg.data

        # TODO define the OpenFlow Packet Out

        out = datapath.ofproto_parser.OFPPacketOut(datapath=datapath, buffer_id=msg.buffer_id, in_port=msg.in_port,  actions=actions, data=data)

        datapath.send_msg(out)

        # add your code here

    print ("PACKET_OUT...")

3.在mininet创建一个最简拓扑，并连接RYU控制器

2019 SDN上机第5次作业-LMLPHP

4.验证自学习交换机的功能，提交分析过程和验证结果

2019 SDN上机第5次作业-LMLPHP

5.写下你的实验体会

因为不会python，在很多地方浪费了大量的时间。