Re: maximum ipv4 bgp prefix length of /24 ?

[Owen DeLong via NANOG <nanog () nanog org>]

Ratio of FIB to RIB is only part of the equation.

IPv6 is NOT under the disaggregation pressure that IPv4 is under because there is no pressure (other than perhaps 
scarcity mentality from those that don’t properly understand IPv6) to dense-pack IPv6 assignments or undersize IPv6 
allocations.

Look at the difference in prefixes per ASN across the two tables and that tells a much grimmer story for IPv4 in terms 
of RIB growth vs. IPv6.

Owen


> On Oct 4, 2023, at 23:30, Mark Tinka <mark@tinka.africa> wrote:
>
>
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> On 10/5/23 08:24, Geoff Huston wrote:
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>
> > The IPv6 FIB is under the same pressure from more specifics. Its taken 20 years to get there, but the IPv6 FIB is 
> > now looking stable at 60% opf the total FIB size [2]. For me, thats a very surprising outcome in an essentially 
> > unmanaged system. 
>
> Were you expecting it to be lower than IPv4?
>
> Mark.