2019 SDN上机第1次作业

1. 安装轻量级网络仿真工具Mininet

使用github上的Mininet源安装

git clone git://github.com/mininet/mininet
cd mininet
sudo ./util/install.sh -a

安装后忘了截图了。。。只好放张装好后的截图了

2. 用字符命令搭建如下拓扑，要求写出命令

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。

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s1_s6，h1h8，并且链路正确，请给出Mininet相关截图）

#!/usr/bin/python

#创建网络拓扑

"""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 
        c = []
        a = []

          

        # 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 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 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() ) }

写完脚本后输入以下命令：

# sudo mn --custom fattree.py --topo mytopo --switch ovsk,protocols=OpenFlow10