+ if (0 == im->mtrie_heap_size)
+ im->mtrie_heap_size = IP4_FIB_DEFAULT_MTRIE_HEAP_SIZE;
+#if USE_DLMALLOC == 0
+ im->mtrie_mheap = mheap_alloc (0, im->mtrie_heap_size);
+#else
+ im->mtrie_mheap = create_mspace (im->mtrie_heap_size, 1 /* locked */ );
+#endif
+
+ /* Burn one ply so index 0 is taken */
+ old_heap = clib_mem_set_heap (ip4_main.mtrie_mheap);