SDN第一次上机作业

1.安装mininet

• mininet安装教程：

2.用字符命令生成拓扑，并测试连通性，截图

• 字符命令方式

• 生成拓扑：

• 测试连通性：

3.用可视化界面生成拓扑，并测试连通性，截图

• 可视化界面

• 生成拓扑：

• 测试：

4.用Python脚本生成一个Fat-tree型的拓扑，截图

• 我自己的ubuntu不是老师发的，在Java环境配置和ant配置时遇到了困难，多次尝试未果，遂拷同学ubuntu来用

• Floodlight Controler Installation Guide

• Fat-tree型的拓扑参考链接

• 生成拓扑：

• 测试：

• 代码：

  #!/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() ) }