使用遥控器无法访问网络

Question

我正在使用下面的代码。在这里，我首先将 hc 添加为主机，在启动 net 之后，我运行在 hc 中进行了一个简单的切换，使其成为一个控制器。问题是网络不可达，即 ping 不工作。谁能告诉我是什么导致了这种行为？

def myNetwork():
    # Create an instance of Mininet class i.e. the network with default values
    net = Mininet()

    info( '*** Adding controller\n' )
    #c0 = net.addController('c0')
    hc = net.addHost( 'hc', ip='127.0.0.1' )
    info( '*** Adding switches\n')
    s1 = net.addSwitch('s1')
    s5 = net.addSwitch('s5')
    s2 = net.addSwitch('s2')
    info( '*** Adding links\n')
    net.addLink(hc, s1)
    net.addLink(s1, s5, cls=TCLink)
    net.addLink(s5, s2, cls=TCLink)
   
    hosts = list()
    #  add all remaining hosts to s2
    info( '*** Adding hosts and Links\n')

    for i in range (1,11):
        name = 'h'+str(i)
        host = net.addHost(name)
        net.addLink( s2, host, cls=TCLink)
        hosts.append(host)
   
    info( '*** Starting network\n')
    net.start()
    hc.cmdPrint('ryu-manager ryu/simple_switch_13.py \
                --verbose 1> tmp/controller-ryu.log 2>&1 &')
    # Start the Mininet CLI to run commands
    CLI(net)
    # Stop the network
    net.stop()
  
if __name__ == '__main__':
    setLogLevel( 'info' )
    myNetwork()

Answer 1

代码中遗漏了很多部分，并且缩进不正确。

创建遥控器不需要hc。您可以使用 system("START CONTROLLER COMMAND") 来运行像 ryu 这样的远程控制器（但我建议运行脚本之外的命令）。比使用 net.addController 函数使用 cls=RemoteController.

def myNetwork():
    # Create an instance of Mininet class i.e. the network with default values
    net = Mininet(controller=RemoteController)

    #info( '*** Adding controller\n' )
    c0 = net.addController('c0', cls=RemoteController)
    #hc = net.addHost( 'hc', ip='127.0.0.1' )
    info( '*** Adding switches\n')
    s1 = net.addSwitch('s1')
    s5 = net.addSwitch('s5')
    s2 = net.addSwitch('s2')
    info( '*** Adding links\n')
    #net.addLink(hc, s1)
    net.addLink(s1, s5, cls=TCLink)
    net.addLink(s5, s2, cls=TCLink)

    hosts = list()
    #  add all remaining hosts to s2
    info( '*** Adding hosts and Links\n')

    for i in range (1,11):
        name = 'h'+str(i)
        host = net.addHost(name)
        net.addLink( s2, host, cls=TCLink)
        hosts.append(host)

    info( '*** Starting network\n')
    net.start()
    #hc.cmdPrint('ryu-manager ryu/simple_switch_13.py \
    #            --verbose 1> tmp/controller-ryu.log 2>&1 &')
    # Start the Mininet CLI to run commands
    CLI(net)
    # Stop the network
    net.stop()

if __name__ == '__main__':
    from mininet.log import setLogLevel, info
    from mininet.net import Mininet
    from mininet.link import TCLink
    from mininet.cli import CLI
    from mininet.node import RemoteController

    setLogLevel( 'info' )
    myNetwork()

使用遥控器无法访问网络

No reachability in the network with remote controller

ping

mininet