sdn第五次上机作业

(一)

hub模块

h1 ping h2

h1 ping h3

l2_learning模块

h1 ping h2

h1 ping h3

区别：hub下h1 ping h2时候h3也会收到数据包，ping h3时h2也会收到数据包，而l2_learning下不会，验证switch模块成功！
流程图：

进阶：

from pox.core import core

import pox.openflow.libopenflow_01 as of

from pox.lib.util import dpidToStr

from pox.lib.addresses import IPAddr, EthAddr

from pox.lib.packet.arp import arp

from pox.lib.packet.ethernet import ethernet, ETHER_BROADCAST

from pox.lib.packet.packet_base import packet_base

from pox.lib.packet.packet_utils import *

import pox.lib.packet as pkt

from pox.lib.recoco import Timer

import time

log = core.getLogger()

s1_dpid = 0


def _handle_ConnectionUp(event):
    global s1_dpid
    print
    "ConnectionUp: ", dpidToStr(event.connection.dpid)

    # remember the connection dpid for switch

    for m in event.connection.features.ports:

        if m.name == "s1-eth1":
            s1_dpid = event.connection.dpid


def _handle_PacketIn(event):
    global s1_dpid

    packet = event.parsed

    if event.connection.dpid == s1_dpid:

        a = packet.find('arp')

        if a and a.protodst == "10.0.0.1":
            msg = of.ofp_packet_out(data=event.ofp)

            msg.actions.append(of.ofp_action_output(port=1))

            event.connection.send(msg)

        if a and a.protodst == "10.0.0.2":
            msg = of.ofp_packet_out(data=event.ofp)

            msg.actions.append(of.ofp_action_output(port=2))

            event.connection.send(msg)

        if a and a.protodst == "10.0.0.3":
            msg = of.ofp_packet_out(data=event.ofp)

            msg.actions.append(of.ofp_action_output(port=3))

            event.connection.send(msg)

        msg = of.ofp_flow_mod()

        msg.priority = 100

        msg.idle_timeout = 0

        msg.hard_timeout = 0

        msg.match.dl_type = 0x0800

        msg.match.nw_dst = "10.0.0.1"

        msg.actions.append(of.ofp_action_output(port=1))

        event.connection.send(msg)

        msg = of.ofp_flow_mod()

        msg.priority = 100

        msg.idle_timeout = 0

        msg.hard_timeout = 0

        msg.match.dl_type = 0x0800

        msg.match.nw_dst = "10.0.0.2"

        msg.actions.append(of.ofp_action_output(port=2))

        event.connection.send(msg)

        msg = of.ofp_flow_mod()

        msg.priority = 100

        msg.idle_timeout = 0

        msg.hard_timeout = 0

        msg.match.dl_type = 0x0800

        msg.match.nw_dst = "10.0.0.3"

        msg.actions.append(of.ofp_action_output(port=3))

        event.connection.send(msg)

def launch():
    core.openflow.addListenerByName("ConnectionUp", _handle_ConnectionUp)

    core.openflow.addListenerByName("PacketIn", _handle_PacketIn)

似乎能用。。？
运行截图：

心得：连接上拓扑图使用的代码是

./pox.py log.level --DEBUG openflow.of_01 --address=127.0.0.1 --port=6633 forwarding.l2_learning
需要指定其所在地址和端口，否则会报错提示端口被占用。

pox在安装mininet时自带，和mininet位于同一个文件夹，无需重新下载

之前忘记流程图，这次补上。流程图直接参考了代码注释。由于是机翻所以看着可能有点怪。流程图使用flowchat语言生成，掌握了一门新技巧，不用要死要活的弄还简洁、自动生成。

打开xterm需要在mininet命令行键入代码为xterm h2 h3，再在里面抓包

进阶能找到的资料特别特别少，试了一遍似乎都不太好使。最终的代码是在SDNLAB里面找到的代码基础上修改的。总之一个程序能跑就别管他（？）。花了大功夫。

本次实验进阶确实整麻了。

凑200字凑200字凑200字凑200字凑200字凑200字凑200字凑200字凑200字凑200字