[j-nsp] Best practice for igp/bgp metrics

[Pavel Lunin]

Reference bandwidth might however be useful for lags, when you may want to
lower the cost of a link if some members go down (though I prefer ECMP in
the core for most cases).

And you can combine the role/latency approach with automatic reference
bandwidth-based cost, if you configure 'bandwidth' parameter on the
interfaces instead of IGP cost.

25 окт. 2017 г. 10:08 ПП пользователь "Saku Ytti" <saku at ytti.fi> написал:

> Hey,
>
> This only matters if you are letting system assign metric
> automatically based on bandwidth. Whole notion of preferring
> interfaces with most bandwidth is fundamentally broken. If you are
> using this design, you might as well assign same number to every
> interface and use strict hop count.
>
> On 25 October 2017 at 22:41, Luis Balbinot <luis at luisbalbinot.com> wrote:
> > Never underestimate your reference-bandwidth!
> >
> > We recently set all our routers to 1000g (1 Tbps) and it was not a
> > trivial task. And now I feel like I'm going to regret that in a couple
> > years. Even if you work with smaller circuits, having larger numbers
> > will give you more range to play around.
> >
> > Luis
> >
> > On Tue, Oct 24, 2017 at 8:50 AM, Alexander Dube <nsp at layerwerks.net>
> wrote:
> >> Hello,
> >>
> >> we're redesigning our backbone with multiple datacenters and pops
> currently and looking for a best practice or a recommendation for
> configuring the metrics.
> >> What we have for now is a full meshed backbone with underlaying isis.
> IBGP exports routes without any metric. LSP are in loose mode and are using
> isis metric for path calculation.
> >>
> >> Do you have a recommendation for metrics/te ( isis and bgp ) to have
> some values like path lengh ( kilometers ), bandwidth, maybe latency, etc
> inside of path calculation?
> >>
> >> Kind regards
> >> Alex
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>
>
> --
>   ++ytti
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