Overlay fabric router

@@ -300,10 +300,11 @@
  * dynamic form may be necessary some day.
  */
 #define OVERLAY_TARGET_ITER_MAX 500
 
 #define OVERLAY_TARGET_CACHE_DROP       0x01
+#define OVERLAY_TARGET_CACHE_ROUTER     0x02
 
 typedef struct overlay_targ_cache_entry {
         uint8_t                 otce_mac[ETHERADDRL];
         uint16_t                otce_flags;
         uint32_t                otce_dcid;