+ /* A sequence number which indicates changes in one of 'netdev''s
+ * properties. It must be nonzero so that users have a value which
+ * they may use as a reset when tracking 'netdev'.
+ *
+ * Minimally, the sequence number is required to change whenever
+ * 'netdev''s flags, features, ethernet address, or carrier changes. */
+ uint64_t change_seq;
+