Proxy ND (RFC4389 - or a sub-set thereof). This allows the 'emulation' of bridging. That is hosts in one sub-net reachable via differenet interfaces.

Introducate a new API command:
  ip6 nd proxy <host-address> <interface>

this indicates 2 things;
 1) that host <host-address> is reachable out of interface <interface>. VPP will thus install that route.
 2) NS requests sent to <host-address> will be responeded to (i.e. proxied).

Change-Id: I863f967fdb5097ab3b574769c70afdbfc8d5478a
Signed-off-by: Neale Ranns <nranns@cisco.com>

test/vpp_papi_provider.py

@@ -276,6 +276,12 @@ class VppPapiProvider(object):
                         {'sw_if_index': sw_if_index,
                          'suppress': suppress})
 
+    def ip6_nd_proxy(self, address, sw_if_index, is_del=0):
+        return self.api(self.papi.ip6nd_proxy_add_del,
+                        {'address': address,
+                         'sw_if_index': sw_if_index,
+                         'is_del': is_del})
+
     def ip6_sw_interface_ra_config(self, sw_if_index,
                                    no,
                                    suppress,