[NDP] Begin to add multicast / NDP support

p4app/controller.py

@@ -89,6 +89,9 @@ class L2Controller(object):
     def init_ndp(self):
         """ initialise neighbor discovery protocol"""
 
+        # https://en.wikipedia.org/wiki/Solicited-node_multicast_address
+        ndp_prefix = "ff02::1:ff00:0/104"
+
         all_ports = range(1,5)
         # create multicast nodes
         for rid in range(1,5):
@@ -101,6 +104,12 @@ class L2Controller(object):
 
             self.controller.mc_node_associate(g_handle, n_handle)
 
+
+        self.controller.table_clear("ndp")
+        for port in all_ports:
+            self.controller.table_add("ndp", "multicast_pkg", [ndp_prefix, port], [str(port)])
+
+
     def init_boilerplate(self, sw_name):
         self.topo = Topology(db="topology.db")
         self.sw_name = sw_name