void isis_adj_state_change(struct isis_adjacency *adj,
enum isis_adj_state state, const char *reason);
void isis_adj_print(struct isis_adjacency *adj);
+const char *isis_adj_yang_state(enum isis_adj_state state);
int isis_adj_expire(struct thread *thread);
void isis_adj_print_vty(struct isis_adjacency *adj, struct vty *vty,
char detail);