Mininet实验 动态改变转发规则
介绍
拓扑如下：
在该环境下，假设H1 ping H4，初始的路由规则是S1-S2-S5，一秒后，路由转发规则变为S1-S3-S5，再过一秒，规则变为S1-S4-S5，然后再回到最初的转发规则S1-S2-S5。通过这个循环调度的例子动态地改变交换机的转发规则。
pox脚本
pox脚本lab_controller.py
不得不说这脚本问题是真的多。
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
s2_dpid = 0
s3_dpid = 0
s4_dpid = 0
s5_dpid = 0
s1_p1 = 0
s1_p4 = 0
s1_p5 = 0
s1_p6 = 0
s2_p1 = 0
s3_p1 = 0
s4_p1 = 0
pre_s1_p1 = 0
pre_s1_p4 = 0
pre_s1_p5 = 0
pre_s1_p6 = 0
pre_s2_p1 = 0
pre_s3_p1 = 0
pre_s4_p1 = 0
turn = 0
def getTheTime(): # fuction to create a timestamp
flock = time.localtime()
then = "[%s-%s-%s" % (str(flock.tm_year),
str(flock.tm_mon), str(flock.tm_mday))
if int(flock.tm_hour) < 10:
hrs = "0%s" % (str(flock.tm_hour))
else:
hrs = str(flock.tm_hour)
if int(flock.tm_min) < 10:
mins = str(flock.tm_min)
secs = "0%s" % (str(flock.tm_sec))
else:
secs = str(flock.tm_sec)
then += "]%s.%s.%s" % (hrs, mins, secs)
return then
def _timer_func():
global s1_dpid, s2_dpid, s3_dpid, s4_dpid, s5_dpid, turn
# print getTheTime(), "sent the port stats request to s1_dpid"
if turn == 0:
msg = of.ofp_flow_mod()
msg.command = of.OFPFC_MODIFY_STRICT
msg.priority = 100
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.dl_type = 0x0800
msg.match.nw_dst = "10.0.0.4"
msg.actions.append(of.ofp_action_output(port=5))
core.openflow.getConnection(s1_dpid).send(msg)
turn = 1
return
if turn == 1:
msg = of.ofp_flow_mod()
msg.command = of.OFPFC_MODIFY_STRICT
msg.priority = 100
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.dl_type = 0x0800
msg.match.nw_dst = "10.0.0.4"
msg.actions.append(of.ofp_action_output(port=6))
core.openflow.getConnection(s1_dpid).send(msg)
turn = 2
return
if turn == 2:
msg = of.ofp_flow_mod()
msg.command = of.OFPFC_MODIFY_STRICT
msg.priority = 100
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.dl_type = 0x0800
msg.match.nw_dst = "10.0.0.4"
msg.actions.append(of.ofp_action_output(port=4))
turn = 0
return
def _handle_portstats_received(event):
global s1_p1, s1_p4, s1_p5, s1_p6, s2_p1, s3_p1, s4_p1
global pre_s1_p1, pre_s1_p4, pre_s1_p5, pre_s1_p6, pre_s2_p1, pre_s3_p1, pre_s4_p1
if event.connection.dpid == s1_dpid:
for f in event.stats:
if int(f.port_no) < 65534:
if f.port_no == 1:
pre_s1_p1 = s1_p1
s1_p1 = f.rx_packets
if f.port_no == 4:
pre_s1_p4 = s1_p4
s1_p4 = f.tx_packets
# s1_p4=f.tx_bytes
if f.port_no == 5:
pre_s1_p5 = s1_p5
s1_p5 = f.tx_packets
if f.port_no == 6:
pre_s1_p6 = s1_p6
s1_p6 = f.tx_packets
for f in event.stats:
if int(f.port_no) < 65534:
if f.port_no == 1:
pre_s2_p1 = s2_p1
s2_p1 = f.rx_packets
# s2_p1=f.rx_bytes
if event.connection.dpid == s3_dpid:
for f in event.stats:
if int(f.port_no) < 65534:
if f.port_no == 1:
pre_s3_p1 = s3_p1
s3_p1 = f.rx_packets
if event.connection.dpid == s4_dpid:
for f in event.stats:
if int(f.port_no) < 65534:
if f.port_no == 1:
pre_s4_p1 = s4_p1
s4_p1 = f.rx_packets
def _handle_ConnectionUp(event):
global s1_dpid, s2_dpid, s3_dpid, s4_dpid, s5_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
print "s1_dpid=", s1_dpid
elif m.name == "s2-eth1":
s2_dpid = event.connection.dpid
print "s2_dpid=", s2_dpid
elif m.name == "s3-eth1":
s3_dpid = event.connection.dpid
print "s3_dpid=", s3_dpid
elif m.name == "s4-eth1":
s4_dpid = event.connection.dpid
print "s4_dpid=", s4_dpid
elif m.name == "s5-eth1":
s5_dpid = event.connection.dpid
print "s5_dpid=", s5_dpid
if s1_dpid <> 0 and s2_dpid <> 0 and s3_dpid <> 0 and s4_dpid <> 0:
Timer(1, _timer_func, recurring=True)
def _handle_PacketIn(event):
global s1_dpid, s2_dpid, s3_dpid, s4_dpid, s5_dpid
packet = event.parsed
if event.connection.dpid == s1_dpid:
a = packet.find('arp')
if a and a.protodst == "10.0.0.4":
msg = of.ofp_packet_out(data=event.ofp)
msg.actions.append(of.ofp_action_output(port=4))
event.connection.send(msg)
if a and a.protodst == "10.0.0.5":
msg = of.ofp_packet_out(data=event.ofp)
msg.actions.append(of.ofp_action_output(port=5))
event.connection.send(msg)
if a and a.protodst == "10.0.0.6":
msg = of.ofp_packet_out(data=event.ofp)
msg.actions.append(of.ofp_action_output(port=6))
event.connection.send(msg)
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)
msg = of.ofp_flow_mod()
msg.priority = 100
msg.idle_timeout = 0
msg.hard_timeout = 1
msg.match.dl_type = 0x0800
msg.match.nw_dst = "10.0.0.4"
msg.actions.append(of.ofp_action_output(port=4))
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 = "10.0.0.5"
msg.actions.append(of.ofp_action_output(port=5))
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 = "10.0.0.6"
msg.actions.append(of.ofp_action_output(port=6))
event.connection.send(msg)
elif event.connection.dpid == s2_dpid:
msg = of.ofp_flow_mod()
msg.priority = 10
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.in_port = 1
msg.match.dl_type = 0x0806
msg.actions.append(of.ofp_action_output(port=2))
event.connection.send(msg)
msg = of.ofp_flow_mod()
msg.priority = 10
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.in_port = 1
msg.match.dl_type = 0x0800
msg.actions.append(of.ofp_action_output(port=2))
event.connection.send(msg)
msg = of.ofp_flow_mod()
msg.priority = 10
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.in_port = 2
msg.match.dl_type = 0x0806
msg.actions.append(of.ofp_action_output(port=1))
event.connection.send(msg)
msg = of.ofp_flow_mod()
msg.priority = 10
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.in_port = 2
msg.match.dl_type = 0x0800
msg.actions.append(of.ofp_action_output(port=1))
event.connection.send(msg)
elif event.connection.dpid == s3_dpid:
msg = of.ofp_flow_mod()
msg.priority = 10
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.in_port = 1
msg.match.dl_type = 0x0806
msg.actions.append(of.ofp_action_output(port=2))
event.connection.send(msg)
msg = of.ofp_flow_mod()
msg.priority = 10
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.in_port = 1
msg.match.dl_type = 0x0800
msg.actions.append(of.ofp_action_output(port=2))
event.connection.send(msg)
msg = of.ofp_flow_mod()
msg.priority = 10
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.in_port = 2
msg.match.dl_type = 0x0806
msg.actions.append(of.ofp_action_output(port=1))
event.connection.send(msg)
msg = of.ofp_flow_mod()
msg.priority = 10
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.in_port = 2
msg.match.dl_type = 0x0800
msg.actions.append(of.ofp_action_output(port=1))
event.connection.send(msg)
elif event.connection.dpid == s4_dpid:
msg = of.ofp_flow_mod()
msg.priority = 10
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.in_port = 1
msg.match.dl_type = 0x0806
msg.actions.append(of.ofp_action_output(port=2))
event.connection.send(msg)
msg = of.ofp_flow_mod()
msg.priority = 10
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.in_port = 1
msg.match.dl_type = 0x0800
msg.actions.append(of.ofp_action_output(port=2))
event.connection.send(msg)
msg = of.ofp_flow_mod()
msg.priority = 10
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.in_port = 2
msg.match.dl_type = 0x0806
msg.actions.append(of.ofp_action_output(port=1))
event.connection.send(msg)
msg = of.ofp_flow_mod()
msg.priority = 10
msg.idle_timeout = 0
msg.hard_timeout = 0
msg.match.in_port = 2
msg.match.dl_type = 0x0800
msg.actions.append(of.ofp_action_output(port=1))
event.connection.send(msg)
elif event.connection.dpid == s5_dpid:
a = packet.find('arp')
if a and a.protodst == "10.0.0.4":
msg = of.ofp_packet_out(data=event.ofp)
msg.actions.append(of.ofp_action_output(port=4))
event.connection.send(msg)
if a and a.protodst == "10.0.0.5":
msg = of.ofp_packet_out(data=event.ofp)
msg.actions.append(of.ofp_action_output(port=5))
event.connection.send(msg)
if a and a.protodst == "10.0.0.6":
msg = of.ofp_packet_out(data=event.ofp)
msg.actions.append(of.ofp_action_output(port=6))
event.connection.send(msg)
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)
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 = "10.0.0.4"
msg.actions.append(of.ofp_action_output(port=4))
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 = "10.0.0.5"
msg.actions.append(of.ofp_action_output(port=5))
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 = "10.0.0.6"
msg.actions.append(of.ofp_action_output(port=6))
event.connection.send(msg)
def launch():
global start_time
core.openflow.addListenerByName("PortStatsReceived", _handle_portstats_received)
core.openflow.addListenerByName("ConnectionUp", _handle_ConnectionUp)
core.openflow.addListenerByName("PacketIn", _handle_PacketIn)
mininet脚本
#!/usr/bin/python
from mininet.topo import Topo
from mininet.net import Mininet
from mininet.node import CPULimitedHost
from mininet.link import TCLink
from mininet.util import dumpNodeConnections
from mininet.log import setLogLevel
from mininet.node import Controller
from mininet.cli import CLI
from functools import partial
from mininet.node import RemoteController
import os
class MyTopo(Topo):
"Single switch connected to n hosts."
def __init__(self):
Topo.__init__(self)
s1=self.addSwitch('s1')
s2=self.addSwitch('s2')
s3=self.addSwitch('s3')
s4=self.addSwitch('s4')
s5=self.addSwitch('s5')
h1=self.addHost('h1')
h2=self.addHost('h2')
h3=self.addHost('h3')
h4=self.addHost('h4')
h5=self.addHost('h5')
h6=self.addHost('h6')
self.addLink(h1, s1, bw=1, delay='10ms', loss=0, max_queue_size=1000, use_htb=True)
self.addLink(h2, s1, bw=1, delay='10ms', loss=0, max_queue_size=1000, use_htb=True)
self.addLink(h3, s1, bw=1, delay='10ms', loss=0, max_queue_size=1000, use_htb=True)
self.addLink(s1, s2, bw=1, delay='10ms', loss=0, max_queue_size=1000, use_htb=True)
self.addLink(s1, s3, bw=1, delay='10ms', loss=0, max_queue_size=1000, use_htb=True)
self.addLink(s1, s4, bw=1, delay='10ms', loss=0, max_queue_size=1000, use_htb=True)
self.addLink(s2, s5, bw=1, delay='10ms', loss=0, max_queue_size=1000, use_htb=True)
self.addLink(s3, s5, bw=1, delay='10ms', loss=0, max_queue_size=1000, use_htb=True)
self.addLink(s4, s5, bw=1, delay='10ms', loss=0, max_queue_size=1000, use_htb=True)
self.addLink(s5, h4, bw=1, delay='10ms', loss=0, max_queue_size=1000, use_htb=True)
self.addLink(s5, h5, bw=1, delay='10ms', loss=0, max_queue_size=1000, use_htb=True)
self.addLink(s5, h6, bw=1, delay='10ms', loss=0, max_queue_size=1000, use_htb=True)
def perfTest():
"Create network and run simple performance test"
topo = MyTopo()
net = Mininet(topo=topo, host=CPULimitedHost, link=TCLink, controller=partial(RemoteController, ip='127.0.0.1', port=6633))
net.start()
print "Dumping host connections"
dumpNodeConnections(net.hosts)
h1,h2,h3=net.get('h1','h2','h3')
h4,h5,h6=net.get('h4','h5','h6')
h1.setMAC("0:0:0:0:0:1")
h2.setMAC("0:0:0:0:0:2")
h3.setMAC("0:0:0:0:0:3")
h4.setMAC("0:0:0:0:0:4")
h5.setMAC("0:0:0:0:0:5")
h6.setMAC("0:0:0:0:0:6")
CLI(net)
net.stop()
if __name__ == '__main__':
setLogLevel('info')
perfTest()
如果是在不同的机器使用的pox将控制器ip修改到对应pox所在的ip，我使用的是同一台计算机上的就直接修改成了127.0.0.1。
然后运行pox脚本再运行mininet脚本，得到下图：
mininet运行没啥问题，不过提示0丢包率是非法的emmmmm。 然后pox的内容有些奇怪，咋感觉少了一句的感觉。强迫症，到脚本里填上。在第260行填上一行输出。得到下图：
鉴于有人说，h1 ping不到 h4，就先pingall一下，得到下图：
一切正常。 然后继续实验，在mininet输入h1 ping -i 0.1 h4 每秒从h1传送10个包到h4。
mininet界面到时挺正常的，但是pox界面emmm一片死寂，所以我反复了几次，结果没有变化。估计不是pox出问题了，就是pox脚本写的有问题吧，难不成是我实验环境有问题？
由于对脚本内容了解的不够，所以我先尝试了一下使用poxdesk图形界面来显示结果。先安装一下。
cd ./pox/ext
git clone https://github.com/MurphyMc/poxdesk
cd poxdesk
wget http://downloads.sourceforge.net/qooxdoo/qooxdoo-2.0.2-sdk.zip
unzip qooxdoo-2.0.2-sdk.zip
mv qooxdoo-2.0.2-sdk qx
cd poxdesk
./generate.py
我的小水管算是把我卡死了
然后通过命令运行：
./pox.py 脚本名 web messenger messenger.log_service messenger.ajax_transport openflow.of_service poxdesk
然后进入浏览器查看：http://pox-ip:8000/poxdesk。这里pox-ip是pox所在的ip，如果本地就直接使用127.0.0.1就行。
观察s1目标为h4的，发现output一直在5和6之间变化，但是理论来说应该有三种不同的路由规则。结果很尴尬。。。
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