SDN第一次上机作业

SDN第一次上机作业

1.安装mininet
（1）. 参考链接1
（2）. 参考链接2我主要是参考这个博客来做的
（3）.

如果ubantu没有安装git，需要安装git

apt install git

获取源码

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

获取源码树并安装Mininet

cat INSTALL

切换到mininet文件下

cd mininet

完整安装命令

./util/install.sh -a

2.用字符命令生成拓扑，并测试连通性，截图
参考链接：http://www.sdnlab.com/15077.html

sudo mn --topo tree,fanout=3,depth=2

3.用可视化界面生成拓扑，并测试连通性，截图
参考链接：http://www.sdnlab.com/15096.html

sudo ./mininet/mininet/examples/miniedit.py 注意sudo

4.用Python脚本生成一个Fat-tree型的拓扑，截图
参考链接：http://www.sdnlab.com/15128.html

#!/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() ) }

注意：

1. 每次要新建拓扑时，需执行以下命令，防止上次操作对本次实验的影响sudo mn -c
2. floodlight的安装相当麻烦，至少我是这样的···安装后要使用也要执行ifconfig命令获取floodlight所在服务器的IP地址
   sudo mn --custom ~/mininet/fattree.py --topo mytopo --controller=remote,ip=10.0.2.15,port=6633 --switch ovsk,protocols=OpenFlow10
   这句就用到了刚刚获得的IP地址。
3. floodlight安装参考：
   [http://www.sdnlab.com/19189.html][7]
   [http://blog.csdn.net/damontive/article/details/48972353][8]
   建议自己下载安装包，git要git很久很久很久····