On 10/26/2011 04:30 AM, Pavel Lunin wrote:
> With simple-va a single prefix flap can mean quite a lot of new entries. > The problem, which can arise here, is not the number of FIB entries, but > the speed of populating (BTW, EX8200 is not the best here either). I'm > not saying this is a problem definitely, but just wondering if someone > has researched, whether (and when) this can become a problem in real life. with any solution comes a tradeoff. the two large problems in this discussion are speed (of change) and size (of total footprint). All routing platforms have a bottleneck at rib -> fib download. All routing platforms have limits to how much rib memory can occupy. All routing platforms have limits on the fib size (in hardware and software). The removal of a large aggregate (say 4/8) and the subsequent required addition of all of the subnets under 4/8 could certainly be 'interesting' to observe. Interesting as well is that 4/8's origin doesn't have to be the flapper, just your network (or an intermediate) changing attributes (or exit path!) could be enough to induce this problem, no? -chris _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
