Re: maximum ipv4 bgp prefix length of /24 ?

[William Herrin <bill () herrin us>]

On Sun, Oct 1, 2023 at 5:40 PM Jakob Heitz (jheitz) via NANOG
<nanog () nanog org> wrote:
> Among the issues:
> Suppose the FIB has all the /24 components to make a /20, so it programs a /20.
> Then one of the /24's changes nexthop. It now has to undo all that compression

Yeah... all this stuff is on the same level of complexity as
implementing a B-Tree. Standard task on the road to an undergraduate
computer science degree. Compared to decoding a BGP update message,
where nearly everything is variable length and you have to nibble away
at the current field to find the start of the next field, this is a
cakewalk.

It doesn't actually get complicated until you want to do more than
just joining adjacent address blocks.

Regards,
Bill Herrin




-- 
William Herrin
bill () herrin us
https://bill.herrin.us/