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

Job Snijders job at
Sat Sep 2 07:05:41 UTC 2017

On Sat, 2 Sep 2017 at 05:41, Randy Bush <randy at> 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 just assumed that the transitive closure of everybody's cones
> implement and propagate count.  ain't gonna happen.

I am not sure what the issue here is. If I can tell my peering partner a
recommended maximum prefix value for them to set on their side, surely I
can configure that same value on my side as the upper outbound limit.

Kind regards,


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