2019 SDN上机第1次作业

1.安装轻量级网络仿真工具Mininet

克隆代码:git clone git://github.com/mininet/mininet

安装程序:sudo ./mininet/util/install.sh -a

(我装了好几次,没见过一次enjoy...但是都可以用)

查看版本:mn -version

2. 用字符命令搭建如下拓扑,要求写出命令

第一个拓扑:sudo mn --topo linear,3


第二个拓扑: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。

  • 搭建拓扑如下图所示

  • 配置IP

  • 勾选openflow

  • net查看端口连接情况(同时可以看到shell界面上的回显)

  • 查看主机IP

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代码如下
#代码以删改为主,主要是注释掉部分原代码就可以实现效果
#!/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 
        #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
        #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 a:
                for i in range(2):
                	host = self.addHost( 'h{}'.format( count ) )
                	self.addLink( sw1, host )
                	count += 1
topos = { 'mytopo': ( lambda: MyTopo() ) }


#screen mn --custom ./fattree.py --topo mytopo --switch ovsk,protocols=OpenFlow10
  • mininet相关截图如下如下:

    编译命令为:
sudo mn --custom ./fattree.py --topo mytopo --switch ovsk,protocols=OpenFlow0
posted @ 2019-11-01 23:38  031702627李至恒  阅读(127)  评论(0编辑  收藏  举报