link failure and blackhole scenarios seem to work
diff --git a/examples/blackhole-abilene.cc b/examples/blackhole-abilene.cc
index 8b13789..8e71033 100644
--- a/examples/blackhole-abilene.cc
+++ b/examples/blackhole-abilene.cc
@@ -1 +1 @@
-
+//we don't need it?