On Sat, 2 May 2020 at 04:26, Benny Lyne Amorsen via cisco-nsp <cisco-nsp@puck.nether.net> wrote:
> You can make things more reasonable by simply taking the square root of > the bandwidth before calculating the metric. Or logarithmic, if you > prefer. > > It is not perfect, of course, but nothing is. I think anything you do with a BW basis is going to be undesirable SPT. This is why I think the default is so harmful, it precludes people from thinking what should their SPT be, because it tends to work good enough. When it does work, the x9 is actually proxy for goal of 'never', the topologies where the behaviour is desirable they never want to go from high-speed => low-speed => high-speed, and as long as 9x is a reasonable proxy for 'never' the SPT works reasonably for many use-cases. But rarely it is the behaviour they actual desire. The right behaviour in this example would be to replace the 9x proxy at speed borders with link-penalty which guarantees high=>low=>high won't happen, not just hope. If SPT would do some unequal balancing based on metrics, then discussion might be very different, and I think somehow intuitively/subconsciously people think something like this happens 'I will have 10x less traffic on my 1GE links'. -- ++ytti _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/