On 19 Feb 2014, at 18:18, Dino Farinacci <[email protected]> wrote:
>> 1. if you store the cache for next reboot, you will not experience >> the miss storm when the traffic will come back to you. >> >> 2. if you shutdown an ITR, packets are forwarded to another ITR and >> there is a miss storm as long as the prefixes in the backup ITR do not >> cover those that where in the "down" ITR. > > LISP promotes multi-homing for inbound traffic to a LISP site, as well as > outbound packets from a LISP site. You deploy LISP so you can get > active-active multihoming. > > So this storm will typically be academic. Well it is not just theoretical, it can happen as soon as you have two egress points, even in active/active mode. Imagine you have two identical egress points in your network (let say that they can both reach the whole Internet) depending on the IGP the traffic from a part of the network will go to one and the traffic from the other part of the network will go to the second router. Unfortunately the set of destination is not the same in both part of the network so when you fallback to one router after the outage of the other one, you will have misses. We have evaluated that on our network (that is primary/backup) and simulated it as active/active and noticed that the storm would not negligible. Damien Saucez > > Dino > _______________________________________________ lisp mailing list [email protected] https://www.ietf.org/mailman/listinfo/lisp
