实验三:Open vSwitch 使用案例扩展实验
一、实验原理
在 SDN 环境中,控制器可以通过对交换机下发流表操作来控制交换机的转发行为。在本实验中,使
用 Mininet 基于 python 的脚本,调用“ovs-vsctl”命令直接控制 Open vSwitch。使用默认的交换
机泛洪规则,设置更高的优先级规则进行预先定义 IP 报文的转发。在多个交换机中通过设置不同 TOS
值的数据包将通过不同的方式到达目的地址,验证主机间的连通性及到达目的的时间。
二、实验任务
使用默认的交换机泛洪规则,设置更高的优先级规则进行预先定义 IP 报文的转发,不同 TOS 值的数
据包将通过不同的方式到达目的地址
Open vSwitch 使用案例扩展实验
SDNLAB 君 • 15-12-01 •11597 人围观
一、实验目的
通过 python 脚本调用 OpenvSwitch 命令;
学习 Mininet 基于 python 脚本创建拓扑的实现;
进一步深度使用“ovs-vsctl”命令直接控制 Open vSwitch。
二、实验原理
在 SDN 环境中,控制器可以通过对交换机下发流表操作来控制交换机的转发行为。在本实验中,使
用 Mininet 基于 python 的脚本,调用“ovs-vsctl”命令直接控制 Open vSwitch。使用默认的交换
机泛洪规则,设置更高的优先级规则进行预先定义 IP 报文的转发。在多个交换机中通过设置不同 TOS
值的数据包将通过不同的方式到达目的地址,验证主机间的连通性及到达目的的时间。
三、实验任务
使用默认的交换机泛洪规则,设置更高的优先级规则进行预先定义 IP 报文的转发,不同 TOS 值的数
据包将通过不同的方式到达目的地址。
三、实验步骤
3.1 实验任务一:
3.1.1 创建 ovsSingleBr.py 脚本。
from mininet.net import Mininet
from mininet.node import Node
from mininet.link import Link
from mininet.log import setLogLevel, info
def myNet():
"Create network from scratch using Open vSwitch."
info( "*** Creating nodes\n" )
switch0 = Node( 's0', inNamespace=False )
h0 = Node( 'h0' )
h1 = Node( 'h1' )
h2 = Node( 'h2' )
info( "*** Creating links\n" )
Link( h0, switch0)
Link( h1, switch0)
Link( h2, switch0)
info( "*** Configuring hosts\n" )
h0.setIP( '192.168.123.1/24' )
h1.setIP( '192.168.123.2/24' )
h2.setIP( '192.168.123.3/24' )
info( "*** Starting network using Open vSwitch\n" )
switch0.cmd( 'ovs-vsctl del-br dp0' )
switch0.cmd( 'ovs-vsctl add-br dp0' )
for intf in switch0.intfs.values():
print intf
print switch0.cmd( 'ovs-vsctl add-port dp0 %s' % intf )
# Note: controller and switch are in root namespace, and we
# can connect via loopback interface
#switch0.cmd( 'ovs-vsctl set-controller dp0 tcp:127.0.0.1:6633' )
print switch0.cmd(r'ovs-vsctl show')
print switch0.cmd(r'ovs-ofctl add-flow dp0
idle_timeout=0,priority=1,in_port=1,actions=flood' )
print switch0.cmd(r'ovs-ofctl add-flow dp0
idle_timeout=0,priority=1,in_port=2,actions=flood' )
print switch0.cmd(r'ovs-ofctl add-flow dp0
idle_timeout=0,priority=1,in_port=3,actions=flood' )
print switch0.cmd(r'ovs-ofctl add-flow dp0
idle_timeout=0,priority=10,ip,nw_dst=192.168.123.1,actions=output:1' )
print switch0.cmd(r'ovs-ofctl add-flow dp0
idle_timeout=0,priority=10,ip,nw_dst=192.168.123.2,actions=output:2' )
print switch0.cmd(r'ovs-ofctl add-flow dp0
idle_timeout=0,priority=10,ip,nw_dst=192.168.123.3,actions=output:3')
#switch0.cmd('tcpdump -i s0-eth0 -U -w aaa &')
#h0.cmd('tcpdump -i h0-eth0 -U -w aaa &')
info( "*** Running test\n" )
h0.cmdPrint( 'ping -c 3 ' + h1.IP() )
h0.cmdPrint( 'ping -c 3 ' + h2.IP() )
#print switch0.cmd( 'ovs-ofctl show dp0' )
#print switch0.cmd( 'ovs-ofctl dump-tables dp0' )
#print switch0.cmd( 'ovs-ofctl dump-ports
dp0' )
#print switch0.cmd( 'ovs-ofctl dump-flows dp0' )
#print switch0.cmd( 'ovs-ofctl dump-aggregate dp0' )
#print switch0.cmd( 'ovs-ofctl queue-stats dp0' )
info( "*** Stopping network\n" )
switch0.cmd( 'ovs-vsctl del-br dp0' )
switch0.deleteIntfs()
info( '\n' )
if __name__ == '__main__':
setLogLevel( 'info' )
info( '*** Scratch network demo (kernel datapath)\n' )
Mininet.init()
myNet()
3.1.2 对文件进行赋权。
通过命令 chmod u+x ovsSingleBr.py 将 ovsSingleBr.py 文件赋权限。此脚本并未连接控制器,只
通过脚本中手动给交换机下发流表实现主机间的通信。
3.1.3 执行脚本。
执行脚本:
3.2 实验任务二:
3.2.1 编写脚本 ovsMultiBr.py。
from mininet.net import Mininet
from mininet.node import Node
from mininet.link import TCLink
from mininet.log import setLogLevel, info
def myNet():
"Create network from scratch using Open vSwitch."
info( "*** Creating nodes\n" )
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" )
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)
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)
TCLink( h1, switch4, **linkopts0)
info( "*** Configuring hosts\n" )
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" )
switch0.cmd( 'ovs-vsctl del-br dp0' )
switch0.cmd( 'ovs-vsctl add-br dp0' )
switch1.cmd( 'ovs-vsctl del-br dp1' )
switch1.cmd( 'ovs-vsctl add-br dp1' )
switch2.cmd( 'ovs-vsctl del-br dp2' )
switch2.cmd( 'ovs-vsctl add-br dp2' )
switch3.cmd( 'ovs-vsctl del-br dp3' )
switch3.cmd( 'ovs-vsctl add-br dp3' )
switch4.cmd( 'ovs-vsctl del-br dp4' )
switch4.cmd( 'ovs-vsctl add-br dp4' )
for intf in switch0.intfs.values():
print intf
print switch0.cmd( 'ovs-vsctl add-port dp0 %s' % intf )
for intf in switch1.intfs.values():
print intf
print switch1.cmd( 'ovs-vsctl add-port dp1 %s' % intf )
for intf in switch2.intfs.values():
print intf
print switch2.cmd( 'ovs-vsctl add-port dp2 %s' % intf )
for intf in switch3.intfs.values():
print intf
print switch3.cmd( 'ovs-vsctl add-port dp3 %s' % intf )
for intf in switch4.intfs.values():
print intf
print switch4.cmd( 'ovs-vsctl add-port dp4 %s' % intf )
print switch1.cmd(r'ovs-ofctl add-flow dp1
idle_timeout=0,priority=1,in_port=1,actions=flood' )
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' )
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' )
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' )
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,actions=output:4')
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')
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')
#print switch0.cmd(r'ovs-ofctl add-flow dp0
idle_timeout=0,priority=10,ip,nw_dst=192.168.123.1,actions=output:1')
#switch0.cmd('tcpdump -i s0-eth0 -U -w aaa &')
#h0.cmd('tcpdump -i h0-eth0 -U -w aaa &')
info( "*** Running test\n" )
h0.cmdPrint( 'ping -Q 0x10 -c 3 ' + h1.IP() )
h0.cmdPrint( 'ping -Q 0x20 -c 3 ' + h1.IP() )
h0.cmdPrint( 'ping -Q 0x30 -c 3 ' + h1.IP() )
#h1.cmdPrint('iperf -s -p 12345 -u &')
#h0.cmdPrint('iperf -c ' + h1.IP() +' -u -b 10m -p 12345 -t 10 -i 1')
#print switch0.cmd( 'ovs-ofctl show dp0' )
#print switch1.cmd( 'ovs-ofctl show dp1' )
#print switch2.cmd( 'ovs-ofctl show dp2' )
#print switch3.cmd( 'ovs-ofctl show dp3' )
#print switch4.cmd( 'ovs-ofctl show dp4' )
#print switch0.cmd( 'ovs-ofctl dump-tables dp0' )
#print switch0.cmd( 'ovs-ofctl dump-ports
dp0' )
#print switch0.cmd( 'ovs-ofctl dump-flows dp0' )
#print switch0.cmd( 'ovs-ofctl dump-aggregate dp0' )
#print switch0.cmd( 'ovs-ofctl queue-stats dp0' )
#print "Testing video transmission between h1 and h2"
#h1.cmd('./myrtg_svc -u > myrd &')
#h0.cmd('./mystg_svc -trace st 192.168.123.2')
info( "*** Stopping network\n" )
switch0.cmd( 'ovs-vsctl del-br dp0' )
switch0.deleteIntfs()
switch1.cmd( 'ovs-vsctl del-br dp1' )
switch1.deleteIntfs()
switch2.cmd( 'ovs-vsctl del-br dp2' )
switch2.deleteIntfs()
switch3.cmd( 'ovs-vsctl del-br dp3' )
switch3.deleteIntfs()
switch4.cmd( 'ovs-vsctl del-br dp4' )
switch4.deleteIntfs()
info( '\n' )
if __name__ == '__main__':
setLogLevel( 'info' )
info( '*** Scratch network demo (kernel datapath)\n' )
Mininet.init()
myNet()
3.2.2 文件赋权。
3.2.3 执行脚本。