+ u32 inside_sw_if_index = 1;
+ u32 outside_sw_if_index = 0;
+
+ vec_validate_init_empty (mp->inside_sw_if_index_table,
+ inside_sw_if_index + 1, EMPTY);
+ vec_validate_init_empty (mp->outside_sw_if_index_table,
+ outside_sw_if_index + 1, EMPTY);
+
+ /*
+ * inside_sw_if_index cell of the table stores outside_sw_if_index
+ * and vice versa. This is ensurs pair of indices being remembered
+ * using one mem-location.
+ */
+ mp->inside_sw_if_index_table[inside_sw_if_index] = outside_sw_if_index;
+ mp->outside_sw_if_index_table[outside_sw_if_index] = inside_sw_if_index;