CODEWITHSUNDEEP
postmansdnmininetopendaylight
Blinera Ahmeti
Blinera Ahmeti

Reputation: 21

Problem with getting bandwidth information from mininet

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.

Upvotes: 2

Views: 1631

Answers (2)

rtmymynbklmn
rtmymynbklmn

Reputation: 26

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

Upvotes: 0

MZaher
MZaher

Reputation: 11

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

Upvotes: 1

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