wh5a/CustomTopo.py

## CustomTopo.py
'''
Coursera:
- Software Defined Networking (SDN) course
-- Module 3 Programming Assignment

Professor: Nick Feamster
Teaching Assistant: Muhammad Shahbaz
'''

from mininet.topo import Topo

class CustomTopo(Topo):
    "Simple Data Center Topology"

    "linkopts - (1:core, 2:aggregation, 3: edge) parameters"
    "fanout - number of child switch per parent switch"
    def __init__(self, linkopts1, linkopts2, linkopts3, fanout=2, **opts):
        # Initialize topology and default options
        Topo.__init__(self, **opts)

        # Numbering:  h1..N, s1..M
        self.hostNum = 1
        self.switchNum = 1
        self.addTree([linkopts1, linkopts2, linkopts3], fanout);

    # Derived from class TreeTopo
    def addTree(self, linkopts, fanout, depth=0):
        isSwitch = depth < 3
        if isSwitch:
            node = self.addSwitch('s%s' % self.switchNum)
            self.switchNum += 1
            for _ in range(fanout):
                child = self.addTree(linkopts, fanout, depth + 1)
                self.addLink(node, child, **linkopts[depth])
        else:
            # host
            node = self.addHost('h%s' % self.hostNum)
            self.hostNum += 1
        return node

topos = { 'custom': ( lambda: CustomTopo() ) }

from mininet.log import setLogLevel
setLogLevel('info')
	'''
	Coursera:
	- Software Defined Networking (SDN) course
	-- Module 3 Programming Assignment

	Professor: Nick Feamster
	Teaching Assistant: Muhammad Shahbaz
	'''

	from mininet.topo import Topo

	class CustomTopo(Topo):
	"Simple Data Center Topology"

	"linkopts - (1:core, 2:aggregation, 3: edge) parameters"
	"fanout - number of child switch per parent switch"
	def __init__(self, linkopts1, linkopts2, linkopts3, fanout=2, **opts):
	# Initialize topology and default options
	Topo.__init__(self, **opts)

	# Numbering: h1..N, s1..M
	self.hostNum = 1
	self.switchNum = 1
	self.addTree([linkopts1, linkopts2, linkopts3], fanout);

	# Derived from class TreeTopo
	def addTree(self, linkopts, fanout, depth=0):
	isSwitch = depth < 3
	if isSwitch:
	node = self.addSwitch('s%s' % self.switchNum)
	self.switchNum += 1
	for _ in range(fanout):
	child = self.addTree(linkopts, fanout, depth + 1)
	self.addLink(node, child, **linkopts[depth])
	else:
	# host
	node = self.addHost('h%s' % self.hostNum)
	self.hostNum += 1
	return node

	topos = { 'custom': ( lambda: CustomTopo() ) }

	from mininet.log import setLogLevel
	setLogLevel('info')