#!/usr/bin/python

from mininet.topo import Topo

class FVTopo(Topo):

def __init__(self):

# Initialize topology

Topo.__init__(self)

# Create template host, switch, and link

hconfig = {'inNamespace':True}

http_link_config = {'bw': 1}

video_link_config = {'bw': 10}

host_link_config = {}

# Create switch nodes

for i in range(4):

sconfig = {'dpid': "%016x" % (i+1)}

self.addSwitch('s%d' % (i+1), **sconfig)

# Create host nodes

for i in range(4):

self.addHost('h%d' % (i+1), **hconfig)

# Add switch links

self.addLink('s1', 's2', **http_link_config)

self.addLink('s2', 's4', **http_link_config)

self.addLink('s1', 's3', **video_link_config)

self.addLink('s3', 's4', **video_link_config)

# Add host links

self.addLink('h1', 's1', **host_link_config)

self.addLink('h2', 's1', **host_link_config)

self.addLink('h3', 's4', **host_link_config)

self.addLink('h4', 's4', **host_link_config)

topos = { 'fvtopo': ( lambda: FVTopo() ) }