Esempio n. 1
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  def policy(self):
    policies = []
    for switch in self.nib.switches_present():
      dpid = self.nib.switch_to_dpid(switch)
      # In normal mode, we capture ARP requests for IP's that don't really exist.  You can
      # think of them as symbolic links to the real IP.  We capture .1 address of
      # each of the endpoint networks, plus any real hosts on the net

      # And we capture ARP requests for the alternate paths.  These will always be for 
      # hosts that have no real estate on the imaginary link, as in 192.168.156.100 along 
      # the 192.168.156.* imaginary network.  This will be translated to the real net 192.168.56.100
      # Note: only the routers actually send these requests, not end hosts, who always send them
      # to a default gateway.  
      for ap in self.nib.alternate_paths():
        (net, mask) = NetUtils.net_mask(ap[switch])
        policies.append(Filter(Policies.at_switch(dpid) & Policies.is_arp() & IP4DstEq(net,mask)) >> Policies.send_to_controller())

    return Union(policies)
Esempio n. 2
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 def router_learning_policy(self):
   # In the intial config, grab all ARP replies for ourselves
   return Filter( Policies.is_arp() ) >> Policies.send_to_controller()