Add options for auto MAC and ARP setup.

Auto MAC setup sets each host MAC equal to its DPID, which simplifies
debugging.

Auto ARP setup removes the need for broadcast support for ARP, which
enables a smaller NOX controller.

bin/mn_run.py

@@ -99,6 +99,10 @@ class MininetRunner(object):
                         help = '[' + ' '.join(TESTS) + ']')
         opts.add_option('--xterms', '-x', action = 'store_true',
                         default = False, help = 'spawn xterms for each node')
+        opts.add_option('--mac', action = 'store_true',
+                        default = False, help = 'set host MACs equal to DPIDs')
+        opts.add_option('--arp', action = 'store_true',
+                        default = False, help = 'set all-pairs ARP entries')
         opts.add_option('--verbosity', '-v', type = 'choice',
                         choices = LEVELS.keys(), default = 'info',
                         help = '[' + ' '.join(LEVELS.keys()) + ']')
@@ -131,8 +135,11 @@ class MininetRunner(object):
 
         controller_params = ControllerParams(0x0a000000, 8) # 10.0.0.0/8
         xterms = self.options.xterms
+        mac = self.options.mac
+        arp = self.options.arp
         mn = Mininet(topo, switch, host, controller, controller_params,
-                     xterms = xterms)
+                     xterms = xterms, auto_set_macs = mac,
+                     auto_static_arp = arp)
 
         test = self.options.test
         if test != 'build':