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.
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