Lab2

實驗目的：改變switch和host之間連結的網路參數(頻寬,延遲時間)

實驗環境:5台switch ,2台host

Topology:

Step 2：新增完之後開啟mymininet7.py，再把頁面最下方的程式碼下載下來，貼上內部的程式碼然後儲存

Step 3：開啟終端機輸入chmod指令更改執行檔案屬性

Step 4：執行mymininet7.py

執行結果

程式碼

#!/usr/bin/python

from mininet.net import Mininet

from mininet.node import Node

from mininet.link import *

from mininet.log import setLogLevel, info

from threading import Timer

def myNet():

info( "*** Creating nodes\n" )

定義swicth名稱

switch0 = Node( 's0', inNamespace=False )

switch1 = Node( 's1', inNamespace=False )

switch2 = Node( 's2', inNamespace=False )

switch3 = Node( 's3', inNamespace=False )

switch4 = Node( 's4', inNamespace=False )

h0 = Node( 'h0' )

h1 = Node( 'h1' )

info( "*** Creating links\n" )

定義switch和host連接的參數

linkopts0=dict(bw=100, delay='1ms', loss=0)

linkopts1=dict(bw=1, delay='100ms', loss=0)

linkopts2=dict(bw=10, delay='50ms', loss=0)

linkopts3=dict(bw=100, delay='1ms', loss=0)

定義switch和host連接狀況

link1=TCLink( h0, switch0, **linkopts0)

TCLink( switch0, switch1, **linkopts0)

TCLink( switch0, switch2, **linkopts0)

TCLink( switch0, switch3, **linkopts0)

TCLink( switch1, switch4,**linkopts1)

TCLink( switch2, switch4,**linkopts2)

TCLink( switch3, switch4,**linkopts3)

link2=TCLink( h1, switch4, **linkopts0)

info( "*** Configuring hosts\n" )

設定host IP

h0.setIP( '192.168.123.1/24' )

h1.setIP( '192.168.123.2/24' )

info( str( h0 ) + '\n' )

info( str( h1 ) + '\n' )

info( "*** Starting network using Open vSwitch\n" )

增加和刪除switch 0 虛擬網卡dp0

switch0.cmd( 'ovs-vsctl del-br dp0' )

switch0.cmd( 'ovs-vsctl add-br dp0' )

增加和刪除switch 1 虛擬網卡dp1

switch1.cmd( 'ovs-vsctl del-br dp1' )

switch1.cmd( 'ovs-vsctl add-br dp1' )

增加和刪除switch 2 虛擬網卡dp2

switch2.cmd( 'ovs-vsctl del-br dp2' )

switch2.cmd( 'ovs-vsctl add-br dp2' )

增加和刪除switch 3 虛擬網卡dp3

switch3.cmd( 'ovs-vsctl del-br dp3' )

switch3.cmd( 'ovs-vsctl add-br dp3' )

增加和刪除switch 4 虛擬網卡dp4

switch4.cmd( 'ovs-vsctl del-br dp4' )

switch4.cmd( 'ovs-vsctl add-br dp4' )

for intf in switch0.intfs.values():

print intf 顯示網路卡介面

print switch0.cmd( 'ovs-vsctl add-port dp0 %s' % intf )將switch0連接虛擬網卡dp0資訊以字串顯示

for intf in switch1.intfs.values():

print intf顯示網路卡介面

print switch1.cmd( 'ovs-vsctl add-port dp1 %s' % intf )將switch1連接虛擬網卡dp1資訊以字串顯示

for intf in switch2.intfs.values():

print intf顯示網路卡介面

print switch2.cmd( 'ovs-vsctl add-port dp2 %s' % intf )將switch2連接虛擬網卡dp2資訊以字串顯示

for intf in switch3.intfs.values():

print intf顯示網路卡介面

print switch3.cmd( 'ovs-vsctl add-port dp3 %s' % intf )將switch3連接虛擬網卡dp3資訊以字串顯示

for intf in switch4.intfs.values():

print intf顯示網路卡介面

print switch4.cmd( 'ovs-vsctl add-port dp4 %s' % intf )將switch4連接虛擬網卡dp4資訊以字串顯示

print switch1.cmd(r'ovs-ofctl add-flow dp1 idle_timeout=0,priority=1,in_port=1,actions=flood' )顯示增加flow到switch1 (設定idle_time out,priority,in_port,action)

print switch1.cmd(r'ovs-ofctl add-flow dp1 idle_timeout=0,priority=1,in_port=1,actions=output:2' )

print switch1.cmd(r'ovs-ofctl add-flow dp1 idle_timeout=0,priority=1,in_port=2,actions=output:1' )

print switch2.cmd(r'ovs-ofctl add-flow dp2 idle_timeout=0,priority=1,in_port=1,actions=output:2' )顯示增加flow到switch2 (設定idle_time out,priority,in_port,action)資訊

print switch2.cmd(r'ovs-ofctl add-flow dp2 idle_timeout=0,priority=1,in_port=2,actions=output:1' )

print switch3.cmd(r'ovs-ofctl add-flow dp3 idle_timeout=0,priority=1,in_port=1,actions=output:2' )顯示增加flow到switch3(設定idle_time out,priority,in_port,action)資訊

print switch3.cmd(r'ovs-ofctl add-flow dp3 idle_timeout=0,priority=1,in_port=2,actions=output:1' )

print switch4.cmd(r'ovs-ofctl add-flow dp4 idle_timeout=0,priority=1,in_port=1,actions=output:4' )顯示增加flow到switch4 (設定idle_time out,priority,in_port,action)資訊

print switch4.cmd(r'ovs-ofctl add-flow dp4 idle_timeout=0,priority=1,in_port=2,actions=output:4' )

print switch4.cmd(r'ovs-ofctl add-flow dp4 idle_timeout=0,priority=1,in_port=3,actions=output:4' )

print switch4.cmd(r'ovs-ofctl add-flow dp4 idle_timeout=0,priority=1,in_port=4,actions=output:3' )

print switch0.cmd(r'ovs-ofctl add-flow dp0 idle_timeout=0,priority=10,ip,nw_dst=192.168.123.2,nw_tos=0x10,actions=output:2') 顯示增加flow到switch0 (設定idle_time out,priority,ip,nw_dst,in_port,action)資訊

print switch0.cmd(r'ovs-ofctl add-flow dp0 idle_timeout=0,priority=10,ip,nw_dst=192.168.123.2,nw_tos=0x20,actions=output:3')

print switch0.cmd(r'ovs-ofctl add-flow dp0 idle_timeout=0,priority=10,ip,nw_dst=192.168.123.2,nw_tos=0x30,actions=output:4')

def cDelay1():定義cdelay1

h1.cmdPrint('ethtool -K h1-eth0 gro off')

h1.cmdPrint('tc qdisc del dev h1-eth0 root')

h1.cmdPrint('tc qdisc add dev h1-eth0 root handle 10: netem delay 100ms')

def hello(a, b='4'):

print a

print b

t=Timer(5.0, cDelay1)

t.start()

info( "*** Running test\n" )

h0.cmdPrint( 'ping -Q 0x30 -c 10 ' + h1.IP() ) h0 ping h1 10次

info( "*** Stopping network\n" )

switch0.cmd( 'ovs-vsctl del-br dp0' )將switch0 虛擬網卡dp0刪除

switch0.deleteIntfs()刪除switch0網路卡介面

switch1.cmd( 'ovs-vsctl del-br dp1' )將switch1 虛擬網卡dp1刪除

switch1.deleteIntfs()刪除switch1網路卡介面

switch2.cmd( 'ovs-vsctl del-br dp2' )將switch2 虛擬網卡dp2刪除

switch2.deleteIntfs()刪除switch2網路卡介面

switch3.cmd( 'ovs-vsctl del-br dp3' )將switch3 虛擬網卡dp3刪除

switch3.deleteIntfs()刪除switch3網路卡介面

switch4.cmd( 'ovs-vsctl del-br dp4' )將switch4 虛擬網卡dp4刪除

switch4.deleteIntfs()刪除switch4網路卡介面

info( '\n' )

if __name__ == '__main__':

setLogLevel( 'info' )

info( '*** Scratch network demo (kernel datapath)\n' )

Mininet.init()

myNet()