SDN第一次上机作业
作业:
实现如下:
1.用字符命令生成拓扑,并测试连通性
创建如下拓扑图:
- 创建过程如下:
- 使用 sudo mn --topo tree,fanout=3,depth=2
截图如下:
- 使用 net 查看
截图如下:
- 使用pingall 来测试连通性
截图如下
- 完成。
2.用可视化界面生成拓扑,并测试连通性
创建如下拓扑图:
- 创建过程如下:
- 使用 在mininet/mininet/examples文件夹下执行 ./miniedit.py 打开可视化界面,然后拖动图标构建拓扑,并分配IP地址
截图如下:
- 点击Run后看到控制台如下:
截图如下: -
- 完成。
3.用Python脚本生成一个Fat-tree型的拓扑
#!/usr/bin/python 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() ) }
拓扑截图:
连通性还没测试成功(floodlight没安装好):