Suppose 2 RR planes, plane1 advertises the best path and plane2 advertises the second best.
If there is no second best, does plane2 advertise nothing? Suppose it does. Suppose there are 2 paths to a destination. P1 is best and P2 second best. Now P1 goes down. Plane1 will change its advertisement to P2. Plane2 will withdraw P2. If the RR client receives and processes the withdrawal first, it will flap. Note, the messages are asynchronous. Even if plane1 sends his message first, the client can still process the message from plane2 first. A solution would be to delay any advertisements from the second-best plane by an interval greater than the MRAI timer. Not good, but I can't think of anything better. -- Jakob Heitz. _______________________________________________ GROW mailing list [email protected] https://www.ietf.org/mailman/listinfo/grow
