2019 SDN上机第1次作业

1. 安装轻量级网络仿真工具Mininet

使用github源安装

安装步骤:

  • clone github
- 使用 sudo ./install.sh -a 命令安装
- 安装完成

2. 用字符命令搭建拓扑,要求写出命令

  • 第一题
    sudo mn --topo linear,4
  • 第二题
    sudo mn --topo tree, fanout=3,depth=2

3. 利用可视化工具搭建拓扑,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。

  • 图形界面
- 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)
- 单击run
- net命令查看拓扑
  • 使用命令验证主机ip,查看拓扑端口连接情况

4. 利用Python脚本完成一个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

  • 截图
- 代码 ``` 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 )

    #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() ) }

posted @ 2019-10-31 14:51  方道友  阅读(203)  评论(0编辑  收藏  举报