SDN第一次上机作业

Posted 谜语

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1.安装mininet

2.用字符命令生成拓扑,并测试连通性


截图:


3.用可视化界面生成拓扑,并测试连通性



4.用Python脚本生成一个Fat-tree型的拓扑


  • python代码
#!/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() ) }

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