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  • SDN第一次上机作业

    作业链接

    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



    4.用Python脚本生成一个Fat-tree型的拓扑,截图

    #!/usr/bin/python
    """Custom topology example
    Adding the 'topos' dict with a key/value pair to generate our newly defined
    topology enables one to pass in '--topo=mytopo' from the command line.
    """
     
    from mininet.topo import Topo
    from mininet.net import Mininet
    from mininet.node import RemoteController,CPULimitedHost
    from mininet.link import TCLink
    from mininet.util import dumpNodeConnections
     
    class MyTopo( Topo ):
        "Simple topology example."
     
        def __init__( self ):
            "Create custom topo."
     
            # Initialize topology
            Topo.__init__( self )
            L1 = 2
            L2 = L1 * 2 
            L3 = L2
            c = []
            a = []
            e = []
              
            # add core ovs  
            for i in range( L1 ):
                    sw = self.addSwitch( 'c{}'.format( i + 1 ) )
                    c.append( sw )
        
            # add aggregation ovs
            for i in range( L2 ):
                    sw = self.addSwitch( 'a{}'.format( L1 + i + 1 ) )
                    a.append( sw )
        
            # add edge ovs
            for i in range( L3 ):
                    sw = self.addSwitch( 'e{}'.format( L1 + L2 + i + 1 ) )
                    e.append( sw )
     
            # add links between core and aggregation ovs
            for i in range( L1 ):
                    sw1 = c[i]
                    for sw2 in a[i/2::L1/2]:
                    # self.addLink(sw2, sw1, bw=10, delay='5ms', loss=10, max_queue_size=1000, use_htb=True)
    			            self.addLink( sw2, sw1 )
     
            # add links between aggregation and edge ovs
            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 )
     
            #add hosts and its links with edge ovs
            count = 1
            for sw1 in e:
                    for i in range(2):
                    	host = self.addHost( 'h{}'.format( count ) )
                    	self.addLink( sw1, host )
                    	count += 1
    topos = { 'mytopo': ( lambda: MyTopo() ) }
    


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  • 原文地址:https://www.cnblogs.com/StephenChenin/p/7955542.html
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