IP bi-direction multicast - same cable check on egress

Change-Id: I655382f7f74181dd7c795a2b22f151f76b50e793
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/ip/ip4_error.h b/src/vnet/ip/ip4_error.h
index d277563..d9b56bc 100644
--- a/src/vnet/ip/ip4_error.h
+++ b/src/vnet/ip/ip4_error.h
@@ -59,6 +59,7 @@
   _ (SRC_LOOKUP_MISS, "ip4 source lookup miss")				\
   _ (DROP, "ip4 drop")                                                  \
   _ (PUNT, "ip4 punt")                                                  \
+  _ (SAME_INTERFACE, "ip4 egrees interface same as ingress")            \
 									\
   /* Errors signalled by ip4-local. */					\
   _ (UNKNOWN_PROTOCOL, "unknown ip protocol")				\