Re: maximum ipv4 bgp prefix length of /24 ?

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

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@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.