Hi, I am working in the area of Hybrid SDN. I have a use case where I have to introduce fake node and fake links in between OpenFlow switches which have legacy switches in between. Below i'm sharing the mininet script, and in this script i have to introduce a node in between s3 and s6 with the links of fake node connected to these two switches. Considering this use case do it have embed this logic in mininet or ryu controller How can i achieve this thing dynamically, could anyone kindly suggest something (possibly code) in this regard. -------------------------------------------MININET_SCRIPT----------------------------------------------------------- *from mininet.node import RemoteController* *from mininet.net <http://mininet.net/> import ** *from mininet.cli import CLI* *from mininet.log import setLogLevel, info*
*def Hybridtopology():* * net = Mininet( topo=None,listenPort=6633,build=False,ipBase='10.0.0.0/8 <http://10.0.0.0/8>')* * info( '*** Adding controller\n' )* * c1 = net.addController("c1",controller=RemoteController,ipBase="127.0.0.0")* * info( '*** Add switches\n')* * s1 = net.addSwitch('s1', cls=OVSKernelSwitch, failMode='secure')* * s2 = net.addSwitch('s2', cls=OVSKernelSwitch, failMode='secure')* * s3 = net.addSwitch('s3', cls=OVSKernelSwitch, failMode='secure')* * s4 = net.addSwitch('s4', cls=OVSKernelSwitch, failMode='standalone')* * s5 = net.addSwitch('s5', cls=OVSKernelSwitch, failMode='standalone')* * s6 = net.addSwitch('s6', cls=OVSKernelSwitch, failMode='secure')* * info( '*** Add hosts\n')* * h1 = net.addHost('h1', cls=Host, ip='10.0.0.1')* * h2 = net.addHost('h2', cls=Host, ip='10.0.0.2')* * h3 = net.addHost('h3', cls=Host, ip='10.0.0.3')* * h4 = net.addHost('h4', cls=Host, ip='10.0.0.4')* * h5 = net.addHost('h5', cls=Host, ip='10.0.0.5')* * h6 = net.addHost('h6', cls=Host, ip='10.0.0.6')* * info( '*** Add links\n')* * net.addLink(h1, s1)* * net.addLink(h2, s2)* * net.addLink(h3, s3)* * net.addLink(h4, s4)* * net.addLink(h5, s5)* * net.addLink(h6, s6)* * net.addLink(s1, s2)* * net.addLink(s2, s3)* * net.addLink(s3, s4)* * net.addLink(s4, s5)* * net.addLink(s5, s6)* * info( '*** Starting network\n')* * net.build()* * info( '*** Starting controllers\n')* * for controller in net.controllers:* * controller.start()* * info( '*** Starting switches\n')* * for switch in net.switches:* * if (switch.failMode=="standalone"):* * info( switch.name <http://switch.name> + ' ')* * switch.start( [ ] )* * else :* * info( switch.name <http://switch.name> + ' ')* * switch.start( net.controllers )* * info( '*** Topology Running\n')* * CLI(net)* * net.stop()* *if __name__ == '__main__':* * setLogLevel( 'info' )* * Hybridtopology()* With Regards Mir Wajahat Hussain
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