2019 SDN上机第1次作业

1. 安装轻量级网络仿真工具Mininet

从github上获取Mininet源码

• git clone git://github.com/mininet/mininet

源码树获取成功以后，安装Mininet

• mininet/util/install.sh[options] 直接用mininet/util/install.sh -a
  

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2. 用字符命令搭建如下拓扑，要求写出命令

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3.利用可视化工具搭建如下拓扑，并要求支持OpenFlow 1.0 1.1 1.2 1.3，设置h1（10.0.0.10）、h2（10.0.0.11）、h3（10.0.0.12），拓扑搭建完成后使用命令验证主机ip，查看拓扑端口连接情况。

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4. 利用Python脚本完成如下图所示的一个Fat-tree型的拓扑（交换机和主机名需与图中一致，即s1s6，h1h8，并且链路正确，请给出Mininet相关截图

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
        switch1 = []
        switch2 = []
        host = []
          
          
        for i in range( L1 ):
                sw = self.addSwitch( 's{}'.format( i + 1 ) )
                switch1.append( sw )
    
        
        for i in range( L2 ):
                sw = self.addSwitch( 's{}'.format( L1 + i + 1 ) )
                switch2.append( sw )
    
        
        for i in range( L3 ):
                sw = self.addSwitch( 'h{}'.format(  L2 + i + 1 ) )
                host.append( sw )
 
        
        for i in range( L1 ):
                sw1 = switch1[i]
                for j in range( L2 ):
                		    sw2 = switch2[j]
			            self.addLink( sw2, sw1 )
 
       
        count = 1
        for sw1 in switch2:
                for i in range(2):
                	Host = self.addHost( 'h{}'.format( count ) )
                	self.addLink( sw1, Host )
                	count += 1
topos = { 'mytopo': ( lambda: MyTopo() ) }