如何在 Mininet 自定义拓扑上设置带宽？

Question

I want to set bandwidth on Mininet custom topology.

The python code is:

#!/usr/bin/python
from mininet.topo import Topo
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

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

    def __init__( self, **opts):
        "Create custom topo."

        # Initialize topology
        Topo.__init__( self, **opts )

        # Add hosts and switches
        h1 = self.addHost('h1')        
        h2 = self.addHost( 'h2' )

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

        # Add links
        self.addLink(h1,s1,bw=10)
        self.addLink(h2,s3,bw=20)
        self.addLink(s3,s2,bw=10)
        self.addLink(s1,s3,bw=10)

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

But it has error

------------------------------------------------------------------
Caught exception. Cleaning up...
TypeError: __init__() got an unexpected keyword argument 'bw'
------------------------------------------------------------------

What can I do? How to set bandwidth on Mininet custom topology?

Answer 1

You should add cls=TCLink on the self.addLink(h1,s1,bw=10)

so the code will be self.addLink(h1,s1,cls=TCLink,bw=10)

Add to the other addLink to make it work

Answer 2

启动 Mininet 时，添加一个额外的参数--link=tc

Answer 3

You should use --link argument. For example: sudo mn --topo tree,depth=2,fanout=5 --controller=remote,ip=10.0.0.1,port=6633 --switch ovsk,protocols=OpenFlow13, --link tc,bw=1,delay=10ms

I'll update with an example soon.

Answer 4

State the bandwidth and the delays in the python file, but while running the file, add

--link=tc

in the command line and it will work fine.

Answer 5

If you are using CLI command mn to run Mininet, add --link=tc .
If you are using a run() function in the python script to start Mininet, use

net = Mininet(topo = MyTopo(), link = TCLink)
net.start()

to start with Mininet with TC links for bandwidth specification to work.