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实验1:SDN拓扑实践

作者:互联网

(一)基本要求

1.使用Mininet可视化工具,生成下图所示的拓扑,并保存拓扑文件名为学号.py

2.使用Mininet的命令行生成如下拓扑:

a) 3台交换机,每个交换机连接1台主机,3台交换机连接成一条线。

b) 3台主机,每个主机都连接到同1台交换机上。

3.在2 b)的基础上,在Mininet交互界面上新增1台主机并且连接到交换机上,再测试新拓扑的连通性。

4.编辑(一)中第1步保存的Python脚本,添加如下网络性能限制,生成拓扑:

a) h1的cpu最高不超过50%;
b) h1和s1之间的链路带宽为10,延迟为5ms,最大队列大小为1000,损耗率50。

(二)进阶要求

运行结果

源文件代码如下:

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 ):
    def __init__( self ):
 
        # Initialize topology
        Topo.__init__( self )
        L1 = 2
        L2 = L1 * 2 
        L3 = L2 * 2
        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 )
 
        # 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() ) }

 

标签:self,sw,实践,range,add,L1,sw1,SDN,拓扑
来源: https://www.cnblogs.com/Leen-Ouyang/p/16685188.html