Re: So am I just excitable?

[Tom Beecher via NANOG <nanog () lists nanog org>]

> I would understand a hand-waving explanation of "this is the Internet,
> it's always being updated, and everyone has a different view of it" if
> the discrepancy were 10^2 or even 10^3. But over 10^5? That's a bit like
> the three top ASNs for route count just disappeared from the Internet.


It really isn't hand waving. It's honestly the correct answer. :)

When you dig into the BGP update data that you can see from your upstreams,
(or parse through Geoff's data :) ) you can really get some fascinating
insight into how dynamic this stuff actually is. With the frequent side
effect of wondering just how drunk a given ASN may be some days. ( Or most
days. :p )

On Fri, Aug 29, 2025 at 5:49 PM Brian Knight via NANOG <
nanog () lists nanog org> wrote:

> On 2025-08-29 15:15, Tom Beecher via NANOG wrote:
> > Geoff's data at Potaroo had the FIB clearing 1M back in Febuary if
> > memory
> > serves. So this already happened months ago.
>
> I'm confused by that.
>
> I show 990450 prefixes in my FIB, 990478 in RIB.
>
> Potaroo shows 1022758 prefixes in FIB for today.
>
> Why would there be a discrepancy of over 32k prefixes?
>
> We're blocking exactly 0 prefixes from our three upstreams.
>
> I would understand a hand-waving explanation of "this is the Internet,
> it's always being updated, and everyone has a different view of it" if
> the discrepancy were 10^2 or even 10^3. But over 10^5? That's a bit like
> the three top ASNs for route count just disappeared from the Internet.
>
> -Brian
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