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I am trying to get the information for link's bandwidth from mininet by using Opendaylight Controller, but the problem is that even though there are different links with different bandwidth in the mininet topology, the information that I get from opendaylight controller (using Postman) is showing the same result for every link.

The python code used to create the topology is: 

from mininet.net import Mininet
from mininet.node import CPULimitedHost
from mininet.link import TCLink
from mininet.util import dumpNodeConnections
from mininet.log import setLogLevel
from mininet.topo import Topo

class MyTopo( Topo ):
    "Simple topology example."

    def __init__( self ):
        "Create custom topo."

        # Initialize topology
        Topo.__init__( self )

        # Add hosts and switches
        H1 = self.addHost( 'h1' )
        H2 = self.addHost( 'h2' )
        H3 = self.addHost( 'h3' )
        H4 = self.addHost( 'h4' )

        S1 = self.addSwitch( 's1')
        S2 = self.addSwitch( 's2')
        S3 = self.addSwitch( 's3')
        S4 = self.addSwitch( 's4')

        # Add links
        self.addLink( H1, S1,cls = TCLink, bw = 5)
        self.addLink( H2, S2,cls = TCLink, bw = 1)
        self.addLink( H3, S3,cls = TCLink, bw = 1)
        self.addLink( H4, S4,cls = TCLink, bw = 1)
        self.addLink( S1, S2,cls = TCLink, bw = 1)
        self.addLink( S2, S3,cls = TCLink, bw = 1)
        self.addLink( S3, S4,cls = TCLink, bw = 1)
        self.addLink( S4, S1,cls = TCLink, bw = 1)

topos = { 'mytopo': ( lambda: MyTopo() ) }

The result from opendaylight controller is:

The result for "sh ovs-ofctl -O OpenFlow13 dump-ports-desc s1", where s1-eth1 is the port that connects H1 with S1:

S1-info

I would really appreciate if someone could help me find a way to get the real information for link capacities from mininet.

Blinera Ahmeti
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2 Answers2

1

you can try the following command from within mininet CLI: sh ovs-ofctl -O openflow13 dump-ports-desc s1

MZaher
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  • Thank you! I have already tried it and it is giving the same result as Postman. – Blinera Ahmeti Nov 15 '19 at 17:43
  • Please check again, I have updated the question with the photo of the results that you asked for! – Blinera Ahmeti Nov 17 '19 at 14:48
  • based the mininet log during the net building, I can say that the links BW matches your code, anyway, try iperf between H1 and H3 then between H2 and H3 and figure out the difference – MZaher Nov 19 '19 at 10:13
0

Here is mine demo conf. for mininet router.py

class LinuxRouter(Node): 

def config(self, **params):
    super(LinuxRouter, self).config(**params)
    self.cmd('sysctl net.ipv4.ip_forward=1') 

def terminate(self):
    self.cmd('sysctl net.ipv4.ip_forward=0') 
    super(LinuxRouter, self).terminate()


class NetworkTopo(Topo): 

def build(self, **_opts):

    router = self.addNode('r0', cls=LinuxRouter, ip='192.168.1.1/24')

    h1_01 = self.addHost('h1_01', ip='192.168.1.100/24', defaultRoute='via 192.168.1.1')
    h1_02 = self.addHost('h1_02', ip='192.168.1.150/24', defaultRoute='via 192.168.1.1')

    h2_01 = self.addHost('h2_01', ip='172.16.0.100/12', defaultRoute='via 172.16.0.1')
    h2_02 = self.addHost('h2_02', ip='172.16.0.150/12', defaultRoute='via 172.16.0.1')

    h3_01 = self.addHost('h3_01', ip='10.0.0.100/8', defaultRoute='via 10.0.0.1') 
    h3_02 = self.addHost('h3_02', ip='10.0.0.150/8', defaultRoute='via 10.0.0.1') 
    h3_03 = self.addHost('h3_03', ip='10.0.0.200/8', defaultRoute='via 10.0.0.1') 

    s1 = self.addSwitch('s1') 
    s2 = self.addSwitch('s2') 
    s3 = self.addSwitch('s3') 

    self.addLink(h1_01, s1) 
    self.addLink(h1_02, s1) 
    self.addLink(h2_01, s2) 
    self.addLink(h2_02, s2) 
    self.addLink(h3_01, s3) 
    self.addLink(h3_02, s3) 
    self.addLink(h3_03, s3) 

    self.addLink(s1, router, intfName2='r0-eth1', params2={'ip': '192.168.1.1/24'}) 
    self.addLink(s2, router, intfName2='r0-eth2', params2={'ip': '172.16.0.1/12'}) 
    self.addLink(s3, router, intfName2='r0-eth3', params2={'ip': '10.0.0.1/8'}) 


def run():
    topo = NetworkTopo() 
    net = Mininet(topo=topo) 
    net.start() (

    print net['r0'].cmd('route') 
    CLI(net) 
    net.stop() 


if __name__ == '__main__':
    setLogLevel('info')
    run()

enter image description here

rtmymynbklmn
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