BFD-FIB interactions

- single-hop BFD: attach a delegate to the appropriate adjacency
- multi-hop BFD [not supported yet]: attach a delegate to the FIB entry.

adjacency/fib_entry state tracks the BFD session state. when the state is down the object does not contribute forwarding hence and hence dependent objects will not use it.
For example, if a route is ECMP via two adjacencies and one of them is BFD down, then only the other is used to forward (i.e. we don't drop half the traffic).

Change-Id: I0ef53e20e73b067001a132cd0a3045408811a822
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/test/vpp_papi_provider.py b/test/vpp_papi_provider.py
index 7f9e2ae1293..e8025dff68e 100644
--- a/test/vpp_papi_provider.py
+++ b/test/vpp_papi_provider.py
@@ -152,8 +152,9 @@ class VppPapiProvider(object):
                 raise UnexpectedApiReturnValueError(msg)
         elif self._expect_api_retval == self._zero:
             if hasattr(reply, 'retval') and reply.retval != expected_retval:
-                msg = "API call failed, expected zero return value instead "\
-                    "of %d in %s" % (expected_retval, repr(reply))
+                msg = "API call failed, expected %d return value instead "\
+                    "of %d in %s" % (expected_retval, reply.retval,
+                                     repr(reply))
                 self.test_class.logger.info(msg)
                 raise UnexpectedApiReturnValueError(msg)
         else: