loop counter to prevent infiinte number of look ups per-packet

Change-Id: I59235d11baac18785a4c90cdaf14e8f3ddf06dab
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
diff --git a/src/vnet/mpls/mpls_lookup.h b/src/vnet/mpls/mpls_lookup.h
index 28c9124..4311dc0 100644
--- a/src/vnet/mpls/mpls_lookup.h
+++ b/src/vnet/mpls/mpls_lookup.h
@@ -24,6 +24,14 @@
  */
 u32 mpls_lookup_to_replicate_edge;
 
+/**
+ * Enum of statically configred MPLS lookup next nodes
+ */
+typedef enum mpls_lookup_next_t_
+{
+    MPLS_LOOKUP_NEXT_DROP = 0,
+} mpls_lookup_next_t;
+
 /*
  * Compute flow hash. 
  * We'll use it to select which adjacency to use for this flow.  And other things.