mininet custom topologies

.Mininet_custom_topo

this is project name keeper

customTopos.py

"""Custom testing topologies - lightweight

Main goal is to build switches fast with minimum links and hosts.
"""
from mininet.topo import Topo

class LightweightTopo( Topo ):
    "Simple topology - fast, every 20th switch has a host and previous switch connected."

    def build(self, topoSize=42, offset = 0):
        lastSwitch = None
        for idx in range(topoSize):
            i = idx + offset
            switchX = self.addSwitch( 's{0}'.format(i), dpid='{0:x}'.format(i + 0x668A0) )
            if lastSwitch:

                if i % 20 == 0:
                    self.addLink( lastSwitch, switchX )
                    hostX = self.addHost( 'h{0}'.format(i) )
                    self.addLink( hostX, switchX )

            lastSwitch = switchX


topos = { 'fastTopo': LightweightTopo }
print('topos prepared: {}'.format(topos))