1.安装mininet

2.用字符命令生成拓扑，并测试连通性，截图

3.用可视化界面生成拓扑，并测试连通性，截图

拓扑图：

命令行显示：

4.用Python脚本生成一个Fat-tree型的拓扑，截图

• 写好脚本

from mininet.topo import Topofrom mininet.net import Mininetfrom mininet.node import RemoteController,CPULimitedHostfrom mininet.link import TCLinkfrom mininet.util import dumpNodeConnectionsclass MyTopo( Topo ):    def __init__( self ):    "Create custom topo."     # Initialize topology    Topo.__init__( self )    L1 = 2    L2 = L1*2    L3 = L2    s = []    a = []    e = []    for i in range(L1):        sw = self.addSwitch('s{}'.format(i+1))        s.append(sw)    for i in range(L2):        sw = self.addSwitch('a{}'.format(i+1))        a.append(sw)    for i in range(L3):        sw = self.addSwitch('e{}'.format(i+1))        e.append(sw)    for i in range(L1):        sw1 = s[i]        for sw2 in a[0:]:            self.addLink(sw2,sw1)    for i in range(0,L2,2):        for sw1 in a[i:i+2]:            for sw2 in e[i:i+2]:                self.addLink(sw2,sw1)    count = 1    for sw1 in e:        for i in range(2):            host = self.addHost('h{}'.format(count))            self.addLink(sw1,host)            count +=1topos = { 'mytopo': ( lambda: MyTopo() ) }

• 运行脚本

  sudo screen mn --custom ./fattree.py --topo mytopo

• 执行过程
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