一、实验目的
- 能够对Open vSwitch进行基本操作;
- 能够通过命令行终端使用OVS命令操作Open vSwitch交换机,管理流表;
- 能够通过Mininet的Python代码运行OVS命令,控制网络拓扑中的Open vSwitch交换机
二、实验环境
Ubuntu 20.04 Desktop amd64
三、实验要求
(一)基本要求
- ovs-vsctl基础操作实践:创建OVS交换机,以ovs-xxxxxxxxx命名,其中xxxxxxxxx为本人学号。在创建的交换机上增加端口p0和p1,设置p0的端口号为100,p1的端口号为101,类型均为internal;为了避免网络接口上的地址和本机已有网络地址冲突,需要创建虚拟网络空间(参考命令netns)ns0和ns1,分别将p0和p1移入,并分别配置p0和p1端口的ip地址为190.168.1.100、192.168.1.101,子网掩码为255.255.255.0;最后测试p0和p1的连通性。
- 使用Mininet搭建的SDN拓扑,如下图所示,要求支持OpenFlow 1.3协议,主机名、交换机名以及端口对应正确。
- 通过命令行终端输入“ovs-ofctl”命令,直接在s1和s2上添加流表,划分出所要求的VLAN。
VLAN_ID | Hosts |
---|---|
0 | h1 h3 |
1 | h2 h4 |
- 主机连通性要求:
- h1 – h3互通
- h2 – h4互通
- 其余主机不通
(二)进阶要求
阅读SDNLAB实验使用Mininet,编写Python代码,生成(一)中的SDN拓扑,并在代码中直接使用OVS命令,做到可以直接运行Python程序完成和(一)相同的VLAN划分。
(三)实验报告
- 请用Markdown排版;
- 基础要求提交
a) /home/用户名/学号/lab2/目录下执行ovs-vsctl show命令、以及p0和p1连通性测试的执行结果截图;from mininet.topo import Topo class MyTopo(Topo): def __init__(self): # initilaize topology Topo. __init__(self) # add hosts h1 = self.addHost('h1') h2 = self.addHost('h2') h3 = self.addHost('h3') h4 = self.addHost('h4') # add switches s1 = self.addSwitch('s1') s2 = self.addSwitch('s2') # add links self.addLink(h1, s1, 1, 1) self.addLink(h2, s1, 1, 2) self.addLink(h3, s2, 1, 1) self.addLink(h4, s2, 1, 2) self.addLink(s1, s2, 3, 3) topos = {'mytopo': (lambda: MyTopo())}
- b) /home/用户名/学号/lab2/目录下开启Mininet CLI并执行pingall命令的截图、上述目录下查看OVS流表的命令结果截图,wireshark抓包截图,其余文字请勿赘述,否则扣分;
- 进阶要求为选做,有完成的同学请提交代码和执行结果截图,有完成比未完成的上机分数更高。
#!/usr/bin/python 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" ) switch1 = Node( 's1', inNamespace=False ) switch2 = Node( 's2', inNamespace=False ) h1 = Node('h1') h2 = Node('h2') h3 = Node('h3') h4 = Node('h4') info( "*** Creating links\n" ) Link(h1, switch1) Link(h2, switch1) Link(h3, switch2) Link(h4, switch2) Link(switch1, switch2) info( "*** Configuring hosts\n" ) h1.setIP( '192.168.123.1/24' ) h2.setIP( '192.168.124.1/24' ) h3.setIP( '192.168.123.2/24' ) h4.setIP( '192.168.124.2/24' ) info( "*** Starting network using Open vSwitch\n" ) switch1.cmd( 'ovs-vsctl del-br dp0' ) switch1.cmd( 'ovs-vsctl add-br dp0' ) switch2.cmd( 'ovs-vsctl del-br dp1' ) switch2.cmd( 'ovs-vsctl add-br dp1' ) for intf in switch1.intfs.values(): print (intf) print (switch1.cmd( 'ovs-vsctl add-port dp0 %s' % intf )) for intf in switch2.intfs.values(): print (intf) print (switch2.cmd( 'ovs-vsctl add-port dp1 %s' % intf )) print (switch1.cmd(r'ovs-vsctl show')) print (switch1.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp0 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:3')) print (switch1.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp0 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:3')) print (switch1.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp0 priority=1,dl_vlan=0,actions=pop_vlan,output:1')) print (switch1.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp0 priority=1,dl_vlan=1,actions=pop_vlan,output:2')) print (switch2.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp1 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:3')) print (switch2.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp1 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:3')) print (switch2.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp1 priority=1,dl_vlan=0,actions=pop_vlan,output:1')) print (switch2.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp1 priority=1,dl_vlan=1,actions=pop_vlan,output:2')) info( "*** Running test\n" ) h1.cmdPrint( 'ping -c 3 ' + h3.IP() ) h2.cmdPrint( 'ping -c 3 ' + h4.IP() ) h1.cmdPrint( 'ping -c 3 ' + h4.IP() ) h2.cmdPrint( 'ping -c 3 ' + h3.IP() ) info( "*** Stopping network\n" ) switch1.cmd( 'ovs-vsctl del-br dp0' ) switch1.deleteIntfs() switch2.cmd( 'ovs-vsctl del-br dp1' ) switch2.deleteIntfs() info( '\n' ) if __name__ == '__main__': setLogLevel( 'info' ) info( '*** Scratch network demo (kernel datapath)\n' ) Mininet.init() myNet()
- 个人总结
标签:ovs,vlan,switch2,switch1,cmd,add,交换机,vSwitch,Open From: https://www.cnblogs.com/zou-linhao/p/16740273.html