text: #!/usr/bin/python
  
  from mininet.topo import Topo
  from mininet.net import Mininet
  from mininet.node import Controller, RemoteController, OVSController
  from mininet.node import CPULimitedHost, Host, Node
  from mininet.cli import CLI
  from mininet.log import setLogLevel, info
  from mininet.link import TCLink, Intf
  from subprocess import call
  from mininet.util import dumpNodeConnections
  from mininet.node import ( UserSwitch, OVSSwitch, IVSSwitch )
  
  class spineTopo( Topo ):
  
      def __init__( self, **opts ):
          "Create a topology."
  
          # Initialize Topology
          Topo.__init__( self, **opts )
  
          # add nodes, Leaf switches
          s1 = self.addSwitch( 's1' )
          s2 = self.addSwitch( 's2' )
          s3 = self.addSwitch( 's3' )
          s4 = self.addSwitch( 's4' )
          s5 = self.addSwitch( 's5' )
          s6 = self.addSwitch( 's6' )
          s7 = self.addSwitch( 's7' )
          s8 = self.addSwitch( 's8' )
          s9 = self.addSwitch( 's9' )
          s10 = self.addSwitch( 's10' )
          s11 = self.addSwitch( 's11' )
          s12 = self.addSwitch( 's12' )
          s13 = self.addSwitch( 's13' )
          s14 = self.addSwitch( 's14' )
  
          # add nodes, Spine switches first...
          s15 = self.addSwitch( 's15' )
          s16 = self.addSwitch( 's16' )
          s17 = self.addSwitch( 's17' )
          s18 = self.addSwitch( 's18' )
          s19 = self.addSwitch( 's19' )
          s20 = self.addSwitch( 's20' )
          s21 = self.addSwitch( 's21' )
          s22 = self.addSwitch( 's22' )
          s23 = self.addSwitch( 's23' )
          s24 = self.addSwitch( 's24' )
          s25 = self.addSwitch( 's25' )
          s26 = self.addSwitch( 's26' )
          s27 = self.addSwitch( 's27' )
          s28 = self.addSwitch( 's28' )
          s29 = self.addSwitch( 's29' )
          s30 = self.addSwitch( 's30' )
          s31 = self.addSwitch( 's31' )
          s32 = self.addSwitch( 's32' )
          s33 = self.addSwitch( 's33' )
          s34 = self.addSwitch( 's34' )
          s35 = self.addSwitch( 's35' )
          s36 = self.addSwitch( 's36' )
          s37 = self.addSwitch( 's37' )
          s38 = self.addSwitch( 's38' )
          s39 = self.addSwitch( 's39' )
          s40 = self.addSwitch( 's40' )
          s41 = self.addSwitch( 's41' )
          s42 = self.addSwitch( 's42' )
          s43 = self.addSwitch( 's43' )
          s44 = self.addSwitch( 's44' )
          s45 = self.addSwitch( 's45' )
          s46 = self.addSwitch( 's46' )
          s47 = self.addSwitch( 's47' )
          s48 = self.addSwitch( 's48' )
          s49 = self.addSwitch( 's49' )
          s50 = self.addSwitch( 's50' )
          s51 = self.addSwitch( 's51' )
          s52 = self.addSwitch( 's52' )
          s53 = self.addSwitch( 's53' )
          s54 = self.addSwitch( 's54' )
          s55 = self.addSwitch( 's55' )
          s56 = self.addSwitch( 's56' )
          s57 = self.addSwitch( 's57' )
          s58 = self.addSwitch( 's58' )
          s59 = self.addSwitch( 's59' )
          s60 = self.addSwitch( 's60' )
          s61 = self.addSwitch( 's61' )
          s62 = self.addSwitch( 's62' )
          s63 = self.addSwitch( 's63' )
          s64 = self.addSwitch( 's64' )
          s65 = self.addSwitch( 's65' )
          s66 = self.addSwitch( 's66' )
          s67 = self.addSwitch( 's67' )
          s68 = self.addSwitch( 's68' )
          s69 = self.addSwitch( 's69' )
          s70 = self.addSwitch( 's70' )
          s71 = self.addSwitch( 's71' )
          s72 = self.addSwitch( 's72' )
          s73 = self.addSwitch( 's73' )
          s74 = self.addSwitch( 's74' )
          s75 = self.addSwitch( 's75' )
          s76 = self.addSwitch( 's76' )
          s77 = self.addSwitch( 's77' )
          s78 = self.addSwitch( 's78' )
  
          # ... and now hosts
          #s1_host = self.addHost( 'h1' )
          #s2_host = self.addHost( 'h2' )
          #s3_host = self.addHost( 'h3' )
          #s4_host = self.addHost( 'h4' )
          #s5_host = self.addHost( 'h5' )
          #s6_host = self.addHost( 'h6' )
          #s7_host = self.addHost( 'h7' )
          #s8_host = self.addHost( 'h8' )
          #s9_host = self.addHost( 'h9' )
          #s10_host = self.addHost( 'h10' )
          s11_host = self.addHost( 'h11' )
          s12_host = self.addHost( 'h12' )
          s13_host = self.addHost( 'h13' )
          s14_host = self.addHost( 'h14' )
          s15_host = self.addHost( 'h15' )
          s16_host = self.addHost( 'h16' )
          s17_host = self.addHost( 'h17' )
          s18_host = self.addHost( 'h18' )
          s19_host = self.addHost( 'h19' )
          s20_host = self.addHost( 'h20' )
          s21_host = self.addHost( 'h21' )
          s22_host = self.addHost( 'h22' )
          s23_host = self.addHost( 'h23' )
          s24_host = self.addHost( 'h24' )
          s25_host = self.addHost( 'h25' )
          s26_host = self.addHost( 'h26' )
          s27_host = self.addHost( 'h27' )
          s28_host = self.addHost( 'h28' )
          s29_host = self.addHost( 'h29' )
          s30_host = self.addHost( 'h30' )
          s31_host = self.addHost( 'h31' )
          s32_host = self.addHost( 'h32' )
          s33_host = self.addHost( 'h33' )
          s34_host = self.addHost( 'h34' )
          s35_host = self.addHost( 'h35' )
          s36_host = self.addHost( 'h36' )
          s37_host = self.addHost( 'h37' )
          s38_host = self.addHost( 'h38' )
          s39_host = self.addHost( 'h39' )
          s40_host = self.addHost( 'h40' )
          s41_host = self.addHost( 'h41' )
          s42_host = self.addHost( 'h42' )
          s43_host = self.addHost( 'h43' )
          s44_host = self.addHost( 'h44' )
          s45_host = self.addHost( 'h45' )
          s46_host = self.addHost( 'h46' )
          s47_host = self.addHost( 'h47' )
          s48_host = self.addHost( 'h48' )
          s49_host = self.addHost( 'h49' )
          s50_host = self.addHost( 'h50' )
          s51_host = self.addHost( 'h51' )
          s52_host = self.addHost( 'h52' )
          s53_host = self.addHost( 'h53' )
          s54_host = self.addHost( 'h54' )
          s55_host = self.addHost( 'h55' )
          s56_host = self.addHost( 'h56' )
          s57_host = self.addHost( 'h57' )
          s58_host = self.addHost( 'h58' )
          s59_host = self.addHost( 'h59' )
          s60_host = self.addHost( 'h60' )
          s61_host = self.addHost( 'h61' )
          s62_host = self.addHost( 'h62' )
          s63_host = self.addHost( 'h63' )
          s64_host = self.addHost( 'h64' )
          s65_host = self.addHost( 'h65' )
          s66_host = self.addHost( 'h66' )
          s67_host = self.addHost( 'h67' )
          s68_host = self.addHost( 'h68' )
          s69_host = self.addHost( 'h69' )
          s70_host = self.addHost( 'h70' )
          s71_host = self.addHost( 'h71' )
          s72_host = self.addHost( 'h72' )
          s73_host = self.addHost( 'h73' )
          s74_host = self.addHost( 'h74' )
          s75_host = self.addHost( 'h75' )
          s76_host = self.addHost( 'h76' )
          s77_host = self.addHost( 'h77' )
          s78_host = self.addHost( 'h78' )
  
          # add edges between switch and corresponding host
          #self.addLink( s1 , s1_host )
          #self.addLink( s2 , s2_host )
          #self.addLink( s3 , s3_host )
          #self.addLink( s4 , s4_host )
          #self.addLink( s5 , s5_host )
          #self.addLink( s6 , s6_host )
          #self.addLink( s7 , s7_host )
          #self.addLink( s8 , s8_host )
          #self.addLink( s9 , s9_host )
          #self.addLink( s10 , s10_host )
          self.addLink( s11 , s11_host )
          self.addLink( s12 , s12_host )
          self.addLink( s13 , s13_host )
          self.addLink( s14 , s14_host )
          self.addLink( s15 , s15_host )
          self.addLink( s16 , s16_host )
          self.addLink( s17 , s17_host )
          self.addLink( s18 , s18_host )
          self.addLink( s19 , s19_host )
          self.addLink( s20 , s20_host )
          self.addLink( s21 , s21_host )
          self.addLink( s22 , s22_host )
          self.addLink( s23 , s23_host )
          self.addLink( s24 , s24_host )
          self.addLink( s25 , s25_host )
          self.addLink( s26 , s26_host )
          self.addLink( s27 , s27_host )
          self.addLink( s28 , s28_host )
          self.addLink( s29 , s29_host )
          self.addLink( s30 , s30_host )
          self.addLink( s31 , s31_host )
          self.addLink( s32 , s32_host )
          self.addLink( s33 , s33_host )
          self.addLink( s34 , s34_host )
          self.addLink( s35 , s35_host )
          self.addLink( s36 , s36_host )
          self.addLink( s37 , s37_host )
          self.addLink( s38 , s38_host )
          self.addLink( s39 , s39_host )
          self.addLink( s40 , s40_host )
          self.addLink( s41 , s41_host )
          self.addLink( s42 , s42_host )
          self.addLink( s43 , s43_host )
          self.addLink( s44 , s44_host )
          self.addLink( s45 , s45_host )
          self.addLink( s46 , s46_host )
          self.addLink( s47 , s47_host )
          self.addLink( s48 , s48_host )
          self.addLink( s49 , s49_host )
          self.addLink( s50 , s50_host )
          self.addLink( s51 , s51_host )
          self.addLink( s52 , s52_host )
          self.addLink( s53 , s53_host )
          self.addLink( s54 , s54_host )
          self.addLink( s55 , s55_host )
          self.addLink( s56 , s56_host )
          self.addLink( s57 , s57_host )
          self.addLink( s58 , s58_host )
          self.addLink( s59 , s59_host )
          self.addLink( s60 , s60_host )
          self.addLink( s61 , s61_host )
          self.addLink( s62 , s62_host )
          self.addLink( s63 , s63_host )
          self.addLink( s64 , s64_host )
          self.addLink( s65 , s65_host )
          self.addLink( s66 , s66_host )
          self.addLink( s67 , s67_host )
          self.addLink( s68 , s68_host )
          self.addLink( s69 , s69_host )
          self.addLink( s70 , s70_host )
          self.addLink( s71 , s71_host )
          self.addLink( s72 , s72_host )
          self.addLink( s73 , s73_host )
          self.addLink( s74 , s74_host )
          self.addLink( s75 , s75_host )
          self.addLink( s76 , s76_host )
          self.addLink( s77 , s77_host )
          self.addLink( s78 , s78_host )
  
          #info( '*** Add Leaf links\n')
          self.addLink(s1, s9)
          self.addLink(s2, s10)
          self.addLink(s3, s9)
          self.addLink(s4, s10)
          self.addLink(s5, s9)
          self.addLink(s6, s10)
          self.addLink(s7, s9)
          self.addLink(s8, s10)
          self.addLink(s9, s11)
          self.addLink(s9, s12)
          self.addLink(s10, s13)
          self.addLink(s10, s14)
          self.addLink(s11, s12)
          self.addLink(s13, s14)
  
          #info( '*** Add Spine-1 links\n')
          self.addLink(s15, s1)
          self.addLink(s15, s2)
          self.addLink(s16, s1)
          self.addLink(s16, s2)
          self.addLink(s17, s1)
          self.addLink(s17, s2)
          self.addLink(s18, s1)
          self.addLink(s18, s2)
          self.addLink(s19, s1)
          self.addLink(s19, s2)
          self.addLink(s20, s1)
          self.addLink(s20, s2)
          self.addLink(s21, s1)
          self.addLink(s21, s2)
          self.addLink(s22, s1)
          self.addLink(s22, s2)
          self.addLink(s23, s1)
          self.addLink(s23, s2)
          self.addLink(s24, s1)
          self.addLink(s24, s2)
          self.addLink(s25, s1)
          self.addLink(s25, s2)
          self.addLink(s26, s1)
          self.addLink(s26, s2)
          self.addLink(s27, s1)
          self.addLink(s27, s2)
          self.addLink(s28, s1)
          self.addLink(s28, s2)
          self.addLink(s29, s1)
          self.addLink(s29, s2)
          self.addLink(s30, s1)
          self.addLink(s30, s2)
  
          #info( '*** Add Spine-2 links\n')
          self.addLink(s31, s3)
          self.addLink(s31, s4)
          self.addLink(s32, s3)
          self.addLink(s32, s4)
          self.addLink(s33, s3)
          self.addLink(s33, s4)
          self.addLink(s34, s3)
          self.addLink(s34, s4)
          self.addLink(s35, s3)
          self.addLink(s35, s4)
          self.addLink(s36, s3)
          self.addLink(s36, s4)
          self.addLink(s37, s3)
          self.addLink(s37, s4)
          self.addLink(s38, s3)
          self.addLink(s38, s4)
          self.addLink(s39, s3)
          self.addLink(s39, s4)
          self.addLink(s40, s3)
          self.addLink(s40, s4)
          self.addLink(s41, s3)
          self.addLink(s41, s4)
          self.addLink(s42, s3)
          self.addLink(s42, s4)
          self.addLink(s43, s3)
          self.addLink(s43, s4)
          self.addLink(s44, s3)
          self.addLink(s44, s4)
          self.addLink(s45, s3)
          self.addLink(s45, s4)
          self.addLink(s46, s3)
          self.addLink(s46, s4)
  
          #info( '*** Add Spine-3 links\n')
          self.addLink(s47, s5)
          self.addLink(s47, s6)
          self.addLink(s48, s5)
          self.addLink(s48, s6)
          self.addLink(s49, s5)
          self.addLink(s49, s6)
          self.addLink(s50, s5)
          self.addLink(s50, s6)
          self.addLink(s51, s5)
          self.addLink(s51, s6)
          self.addLink(s52, s5)
          self.addLink(s52, s6)
          self.addLink(s53, s5)
          self.addLink(s53, s6)
          self.addLink(s54, s5)
          self.addLink(s54, s6)
          self.addLink(s55, s5)
          self.addLink(s55, s6)
          self.addLink(s56, s5)
          self.addLink(s56, s6)
          self.addLink(s57, s5)
          self.addLink(s57, s6)
          self.addLink(s58, s5)
          self.addLink(s58, s6)
          self.addLink(s59, s5)
          self.addLink(s59, s6)
          self.addLink(s60, s5)
          self.addLink(s60, s6)
          self.addLink(s61, s5)
          self.addLink(s61, s6)
          self.addLink(s62, s5)
          self.addLink(s62, s6)
  
          #info( '*** Add Spine-4 links\n')
          self.addLink(s63, s7)
          self.addLink(s63, s8)
          self.addLink(s64, s7)
          self.addLink(s64, s8)
          self.addLink(s65, s7)
          self.addLink(s65, s8)
          self.addLink(s66, s7)
          self.addLink(s66, s8)
          self.addLink(s67, s7)
          self.addLink(s67, s8)
          self.addLink(s68, s7)
          self.addLink(s68, s8)
          self.addLink(s69, s7)
          self.addLink(s69, s8)
          self.addLink(s70, s7)
          self.addLink(s70, s8)
          self.addLink(s71, s7)
          self.addLink(s71, s8)
          self.addLink(s72, s7)
          self.addLink(s72, s8)
          self.addLink(s73, s7)
          self.addLink(s73, s8)
          self.addLink(s74, s7)
          self.addLink(s74, s8)
          self.addLink(s75, s7)
          self.addLink(s75, s8)
          self.addLink(s76, s7)
          self.addLink(s76, s8)
          self.addLink(s77, s7)
          self.addLink(s77, s8)
          self.addLink(s78, s7)
          self.addLink(s78, s8)
  
  topos = { 'spine': ( lambda: spineTopo() ) }
  
  # HERE THE CODE DEFINITION OF THE TOPOLOGY ENDS
  
  def setupNetwork():
      "Create network"
      topo = spineTopo()
      #if controller_ip == '':
          #controller_ip = '10.0.2.2';
      #    controller_ip = '127.0.0.1';
      network = Mininet(topo=topo, switch=OVSSwitch, link=TCLink, autoSetMacs = True, controller=None)
      network.start()
      CLI( network )
      network.stop()
  
  if __name__ == '__main__':
      setLogLevel('info')
      #setLogLevel('debug')
      setupNetwork()
  