2019 SDN上機第1次做業

安裝輕量級網絡仿真工具Mininet

我使用了git安裝node

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

用字符命令搭建以下拓撲,要求寫出命令

sudo mn --topo linear,3

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

查看:

3. 利用可視化工具搭建以下拓撲,並要求支持OpenFlow 1.0 1.1 1.2 1.3,設置h1(10.0.0.10)、h2(10.0.0.11)、h3(10.0.0.12),拓撲搭建完成後使用命令驗證主機ip,查看拓撲端口鏈接狀況。

4. 利用Python腳本完成以下圖所示的一個Fat-tree型的拓撲(交換機和主機名需與圖中一致,即s1~s6,h1~h8,而且鏈路正確,請給出Mininet相關截圖)

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 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() ) }

實驗總結

本次實驗較爲簡單,基本上按照給定的操做循序漸進,配置好合適的環境就能夠順利完成做業。python

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