maximum ipv4 bgp prefix length of /24 ?

Thu Oct 5 05:49:09 UTC 2023

Been resisting adding to this thread...

But if the assumption is that networks will always eventually totally
deaggregate to the maximum, we're screwed. Routing IPv4 /32s would be
nothing. The current practice of accepting /48s could swell to about 2^(48
- 3) = 2^45 = 35184372088832.

What will prevent unrestricted growth of the IPv6 table if operators push
everything out to /48 "to counter hijacks" or other misguided reasons?

On Wed, Oct 4, 2023 at 8:14 AM Owen DeLong via NANOG <nanog at nanog.org>
wrote:

> If you maximally disaggregate to /24, you end up with about 12M fib
> entries. At /25 this doubles and you double it again for every bit you move
> right.
>
> At /24, we are on borrowed time without walking right. Also, the CPU in
> most routers won’t handle the churn of a 10M prefix RIB.
>
> Owen
>
>
> > On Oct 4, 2023, at 03:15, Mark Tinka <mark at tinka.africa> wrote:
> >
> > 
> >
> >> On 10/4/23 12:11, Musa Stephen Honlue wrote:
> >>
> >> Which one is easier,
> >>
> >> 1. Convincing the tens of thousands of network operators and equipment
> vendors to modify configs and code to accept more specifics than /24, or
> >
> > Equipment vendors can already support 10 million entries in FIB. They
> just ask for a little bit of cash for it.
> >
> > Mark.
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.nanog.org/pipermail/nanog/attachments/20231004/97c7d339/attachment.html>