网络拓扑：
仿真结果：
python代码：
#!/usr/bin/python from mininet.net import Mininet from mininet.node import Controller, RemoteController, OVSController from mininet.node import CPULimitedHost, Host, Node from mininet.node import OVSKernelSwitch, UserSwitch from mininet.node import IVSSwitch from mininet.cli import CLI from mininet.log import setLogLevel, info from mininet.link import TCLink, Intf from subprocess import call def myNetwork(): net = Mininet( topo=None, build=False, ipBase='10.0.0.0/8') info( '*** Adding controller ' ) info( '*** Add switches ') r3 = net.addHost('r3', cls=Node, ip='0.0.0.0') r3.cmd('sysctl -w net.ipv4.ip_forward=1') r4 = net.addHost('r4', cls=Node, ip='0.0.0.0') r4.cmd('sysctl -w net.ipv4.ip_forward=1') r2 = net.addHost('r2', cls=Node, ip='0.0.0.0') r2.cmd('sysctl -w net.ipv4.ip_forward=1') r6 = net.addHost('r6', cls=Node, ip='0.0.0.0') r6.cmd('sysctl -w net.ipv4.ip_forward=1') r1 = net.addHost('r1', cls=Node, ip='0.0.0.0') r1.cmd('sysctl -w net.ipv4.ip_forward=1') r5 = net.addHost('r5', cls=Node, ip='0.0.0.0') r5.cmd('sysctl -w net.ipv4.ip_forward=1') info( '*** Add hosts ') h1 = net.addHost('h1', cls=Host, ip='10.0.0.1', defaultRoute=None) h2 = net.addHost('h2', cls=Host, ip='10.0.0.2', defaultRoute=None) info( '*** Add links ') net.addLink(h1, r1) net.addLink(h1, r2) net.addLink(r1, r3) net.addLink(r2, r3) net.addLink(r3, r4) net.addLink(r4, r5) net.addLink(r4, r6) net.addLink(r5, h2) net.addLink(r6, h2) info( '*** Starting network ') net.build() info( '*** Starting controllers ') for controller in net.controllers: controller.start() info( '*** Starting switches ') h1.cmd('ifconfig h1-eth0 192.168.10.1/24') h1.cmd('ifconfig h1-eth1 192.168.20.1/24') r1.cmd('ifconfig r1-eth0 192.168.10.2/24') r1.cmd('ifconfig r1-eth1 192.168.30.1/24') r2.cmd('ifconfig r2-eth0 192.168.20.2/24') r2.cmd('ifconfig r2-eth1 192.168.40.1/24') r3.cmd('ifconfig r3-eth0 192.168.30.2/24') r3.cmd('ifconfig r3-eth1 192.168.40.2/24') r3.cmd('ifconfig r3-eth2 192.168.50.2/24') r4.cmd('ifconfig r4-eth0 192.168.50.1/24') r4.cmd('ifconfig r4-eth1 192.168.60.1/24') r4.cmd('ifconfig r4-eth2 192.168.70.1/24') r5.cmd('ifconfig r5-eth0 192.168.60.2/24') r5.cmd('ifconfig r5-eth1 192.168.80.2/24') r6.cmd('ifconfig r6-eth0 192.168.70.2/24') r6.cmd('ifconfig r6-eth1 192.168.90.2/24') h2.cmd('ifconfig h2-eth0 192.168.80.1/24') h2.cmd('ifconfig h2-eth1 192.168.90.1/24') h1.cmd('ip route add 192.168.10.0/24 via 192.168.10.2 dev h1-eth0 table 520') h1.cmd('ip route add default via 192.168.10.2 dev h1-eth0 table 520') h1.cmd('ip route add 192.168.20.0/24 via 192.168.20.2 dev h1-eth1 table 521') h1.cmd('ip route add default via 192.168.20.2 dev h1-eth1 table 521') h1.cmd('ip rule add from 192.168.10.1 table 520') h1.cmd('ip rule add from 192.168.20.1 table 521') r1.cmd('ip route add default via 192.168.30.2') r2.cmd('ip route add default via 192.168.40.2') r3.cmd('ip route add 192.168.10.0/24 via 192.168.30.1 dev r3-eth0') r3.cmd('ip route add 192.168.20.0/24 via 192.168.40.1 dev r3-eth1') r3.cmd('ip route add default via 192.168.50.1 dev r3-eth2') r4.cmd('ip route add 192.168.80.0/24 via 192.168.60.2 dev r4-eth1') r4.cmd('ip route add 192.168.90.0/24 via 192.168.70.2 dev r4-eth2') r4.cmd('ip route add default via 192.168.50.2 dev r4-eth0') r5.cmd('ip route add default via 192.168.60.1') r6.cmd('ip route add default via 192.168.70.1') h2.cmd('ip route add 192.168.80.0/24 via 192.168.80.2 dev h2-eth0 table 510') h2.cmd('ip route add default via 192.168.80.2 dev h2-eth0 table 510') h2.cmd('ip route add 192.168.90.0/24 via 192.168.90.2 dev h2-eth1 table 512') h2.cmd('ip route add default via 192.168.90.2 dev h2-eth1 table 512') h2.cmd('ip rule add from 192.168.80.1 table 510') h2.cmd('ip rule add from 192.168.90.1 table 512') info( '*** Post configure switches and hosts ') CLI(net) net.stop() if __name__ == '__main__': setLogLevel( 'info' ) myNetwork()