diff --git a/zebra/interface.h b/zebra/interface.h
index 8baf186..223caf8 100644
--- a/zebra/interface.h
+++ b/zebra/interface.h
@@ -38,6 +38,19 @@
 #define IF_ZEBRA_SHUTDOWN_OFF    0
 #define IF_ZEBRA_SHUTDOWN_ON     1
 
+/* Global user-configured default for interface link-detect */
+typedef enum {
+  IF_LINKDETECT_UNSPEC = 0,
+  IF_LINKDETECT_ON,
+  IF_LINKDETECT_OFF,
+} zebra_if_linkdetect;
+
+/* Global defaults for interfaces */
+struct zebra_if_defaults {
+  /* Link-detect default configuration */
+  zebra_if_linkdetect linkdetect;
+};
+
 #if defined (HAVE_RTADV)
 /* Router advertisement parameter.  From RFC4861, RFC6275 and RFC4191. */
 struct rtadvconf
@@ -185,7 +198,10 @@
 
   /* Router advertise configuration. */
   u_char rtadv_enable;
-
+  
+  /* Interface specific link-detect configuration state */
+  zebra_if_linkdetect linkdetect;
+  
   /* Installed addresses chains tree. */
   struct route_table *ipv4_subnets;