-extern int str2prefix_rd (const char *, struct prefix_rd *);
-extern char *prefix_rd2str (struct prefix_rd *, char *, size_t);
+extern int str2prefix_rd(const char *, struct prefix_rd *);
+extern char *prefix_rd2str(struct prefix_rd *, char *, size_t);
+extern void form_auto_rd(struct in_addr router_id, uint16_t rd_id,
+ struct prefix_rd *prd);