Error creating interface pair (s1-eth1,h1-eth0) in mininet

I have created a custom topology as following and run it using mininet and connect to POX remote controller.

class CustomTopo (Topo):   
    def build(self):
        S1 = self.addSwitch('s1')
        H1 = self.addHost('h1')
        H2 = self.addHost('h2')
        self.addLink(S1, H1)
        self.addLink(S1, H2)

topo = CustomTopo()
net = Mininet(topo)
net.start()
topos = {'mytopo': CustomTopo}

It worked correctly first time, but after that I received following error in POX controller when it tried to add links:

Caught exception. Cleaning up… Exception: Error creating interface pair (s1-eth1,h1-eth0): RTNETLINK answers: File exists

What can I do to solve it?

[Hrish1]

try running “sudo mn -c”

and then run the script.

On Mon, May 28, 2018 at 9:23 PM, Babak Memar [e-mail] wrote:

I have created a custom topology as following and run it using mininet and connect to POX remote controller.

class CustomTopo (Topo): def build(self): S1 = self.addSwitch(‘s1’) H1 = self.addHost(‘h1’) H2 = self.addHost(‘h2’) self.addLink(S1, H1) self.addLink(S1, H2)

topo = CustomTopo() net = Mininet(topo) net.start() topos = {‘mytopo’: CustomTopo}

It worked correctly first time, but after that I received following error in POX controller when it tried to add links:

Caught exception. Cleaning up… Exception: Error creating interface pair (s1-eth1,h1-eth0): RTNETLINK answers: File exists

What can I do to solve it?

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[BabakMemar]

I already try it but it does not solve the problem. @Hrish1