maximum ipv4 bgp prefix length of /24 ?

Wed Oct 4 15:13:24 UTC 2023

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.