+
+ return (format (s, "unknown"));
+}
+
+uword
+unformat_ip_address_family (unformat_input_t * input, va_list * args)
+{
+ ip_address_family_t *af = va_arg (*args, ip_address_family_t *);
+
+ if (unformat (input, "ip4") || unformat (input, "ipv4") ||
+ unformat (input, "IP4") || unformat (input, "IPv4"))