• 2019 SDN上机第1次作业


    1. 安装轻量级网络仿真工具Mininet

    git clone git://github.com/mininet/mininet.git
    cd mininet
    git tag
    git checkout 2.3.0d6
    ./util/install.sh -a
    


    2. 用字符命令搭建如下拓扑,要求写出命令

    输入命令:sudo mn --topo linear,3

    输入命令:sudo mn --topo tree,fanout=3,depth=2

    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。

    可视化工具创建拓扑如下:

    设置支持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):

    点击RUN运行:

    验证主机IP,输入Xterm h1 h2 h3,再分别输入ifconfig

    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)

    Python代码:

    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( 's{}'.format( i + 1 ) )
                    c.append( sw )
        
            # add aggregation ovs
            for i in range( L2 ):
                    sw = self.addSwitch( 's{}'.format( L1 + i + 1 ) )
                    a.append( sw )
        
            # add edge ovs
     
            # 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
     
            #add hosts and its links with edge ovs
            count = 1
            for sw1 in a:
                    for i in range(2):
                        host = self.addHost( 'h{}'.format( count ) )
                        self.addLink( sw1, host )
                        count += 1
    topos = { 'mytopo': ( lambda: MyTopo() ) }
    

    使用命令sudo mn --custom fattree.py --topo mytopo --controller=remote,ip=127.0.0.1,port=6633 --switch ovsk,protocols=OpenFlow10运行,得到如下结果:

    使用net查看拓扑:

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  • 原文地址:https://www.cnblogs.com/wersat/p/11785065.html
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