mininet-sample/mpMultiInterfaceTopo.py

from mpTopo import MpTopo

class MpMultiInterfaceTopo(MpTopo):
	def __init__(self, topoBuilder, parameterFile):
		MpTopo.__init__(self,topoBuilder, parameterFile)
		print("Hello from topo multi if")
		self.client = self.addHost(MpTopo.clientName)
		self.server = self.addHost(MpTopo.serverName)
		self.router = self.addHost(MpTopo.routerName)
		self.switchClient = []
		self.switchServer = []
		for l in self.topoParam.linkCharacteristics:
			self.switchClient.append(self.addSwitch1ForLink(l))
			self.addLink(self.client,self.switchClient[-1])
			self.switchServer.append(self.addSwitch2ForLink(l))
			self.addLink(self.switchClient[-1], self.switchServer[-1], **l.asDict())
			self.addLink(self.switchServer[-1],self.router)
		self.addLink(self.router, self.server)

	def addSwitch1ForLink(self, link):
		return self.addSwitch(MpMultiInterfaceTopo.switchNamePrefix +
				str(2 * link.id))

	def addSwitch2ForLink(self, link):
		return self.addSwitch(MpMultiInterfaceTopo.switchNamePrefix +
                str(2 * link.id + 1))

	def __str__(self):
		s = "Simple multiple interface topolgy \n"
		i = 0
		n = len(self.topoParam.linkCharacteristics)
		for p in self.topoParam.linkCharacteristics:
			if i == n // 2:
				if n % 2 == 0:
					s = s + "c            r-----s\n"
					s = s + "|--sw----sw--|\n"
				else:
					s = s + "c--sw----sw--r-----s\n"
			else:
				s = s + "|--sw----sw--|\n"

			i = i + 1
		return s