这是快速做出的。它似乎工作。我得到了一些

topolib.py

代码使用递归。函数addTree（）在其自身内部调用。

    
      author = ‘Ehsan’
from mininet.node import CPULimitedHost
from mininet.topo import Topo
from mininet.net import Mininet
from mininet.log import setLogLevel, info
from mininet.node import RemoteController
from mininet.cli import CLI
from mininet.link import TCLink
“””
Instructions to run the topo:
1. Go to directory where this fil is.
2. run: sudo -E python <file name>
   In this case it is: sudo -E python Tree_Generic_Topo.py     
“””
class GenericTree(Topo):
    “””Simple topology example.”””
def build( self, depth=1, fanout=2 ):
    # Numbering:  h1..N, s1..M
    self.hostNum = 1
    self.switchNum = 1
def build( self, depth=1, fanout=2 ):
    # Numbering:  h1..N, s1..M
    self.hostNum = 1
    self.switchNum = 1
    # Build topology
    self.addTree(depth, fanout)
def addTree( self, depth, fanout ):
    """Add a subtree starting with node n.
       returns: last node added"""
    isSwitch = depth > 0
    if isSwitch:
        node = self.addSwitch( 's%s' % self.switchNum )
        self.switchNum += 1
        for _ in range( fanout ):
            child = self.addTree( depth - 1, fanout )
            self.addLink( node, child )
    else:
        node = self.addHost( 'h%s' % self.hostNum )
        self.hostNum += 1
    return node
def run():
    c = RemoteController(‘c’, ‘0.0.0.0’, 6633)
# Change the args of GenericTree() to your desired values. You could even get them from command line.
net = Mininet(topo=GenericTree(depth=2, fanout=3), host=CPULimitedHost, controller=None)
net.addController(c)
net.start()
# installStaticFlows( net )
CLI(net)
net.stop()
if the script is run directly (sudo custom/optical.py):
if name == ‘main‘:
    setLogLevel(‘info’)
    run()
</code>