Max Prefix Out, was Re: Verizon 701 Route leak?

Fri Sep 1 15:21:14 UTC 2017

On Fri, Sep 1, 2017 at 7:56 AM, Patrick W. Gilmore <patrick at ianai.net>
wrote:

> On Sep 1, 2017, at 5:26 AM, Randy Bush <randy at psg.com> wrote:
> >
> > i have 142 largish bgp customers, a large enough number that the number
> > of prefixes i receive from them varies annoyingly.  how do i reasonably
> > automate setting of my outbound prefix limit?
>
> First, it seems you know the inbound so automating the outbound is simple
> arithmetic.
>
>
I would have said the same... i ought to know high-water marks for your
inbound peer count(s), and can work out a +20% outbound...

you also probably can survey your outbound peerings and +20% some
high-water mark there, or make a 'meet in the middle' between the
inbound-math and outbound-math.

> But even if that is unruly, setting the outbound to, say, 300K or so would
> keep you from spilling a full table. Not perfect, but better than nothing.
>
> Orrrrrr, perhaps this feature is not for you?
>
> --
> TTFN,
> patrick
>
>