+typedef struct
+{
+ fib_prefix_t prefix;
+
+ u32 sw_if_index;
+} ip_interface_prefix_key_t;
+
+typedef struct
+{
+ /* key - prefix and sw_if_index */
+ ip_interface_prefix_key_t key;
+
+ /* number of addresses in this prefix on the interface */
+ u16 ref_count;
+
+ /* index of the interface address used as a default source address */
+ u32 src_ia_index;
+} ip_interface_prefix_t;