nanog mailing list archives
Re: maximum ipv4 bgp prefix length of /24 ?
From: Saku Ytti <saku () ytti fi>
Date: Sun, 1 Oct 2023 11:00:29 +0300
On Sun, 1 Oct 2023 at 06:07, Owen DeLong via NANOG <nanog () nanog org> wrote:
Not sure why you think FIB compression is a risk or will be a mess. It’s a pretty straightforward task.
Also people falsely assume that the parts they don't know about, are risk free and simple. While in reality there are tons of proprietary engineering choices to make devices perform in expected environments, not arbitrary environments. So already today you could in many cases construct specific FIB, which exposes these compromises and makes devices not perform. There are dragons everywhere, but we can remain largely ignorant of them, as these engineering choices tend to be reasonable. Sometimes they are abused by shops like EANTC and Miercom for marketing reasons for ostensibly 'independent' tests. I think this compression is part of this continuum, magic inside the box I hope works because I can't begin to have a comprehensive understanding exactly how much risk I am carrying. Pretty much all performant boxes no longer have bandwidth to store all packets in memory (partial buffering), many of them have 'hot' and 'cold' prefixes. You just gotta hope, you're not gonna be able to prove anything, and by trying to do so, you're more likely to increase your costs due to false positives than you are to find an actionable problem. Most problems don't matter, figuring out which problem needs to be fixed is hard. -- ++ytti
Current thread:
- Re: maximum ipv4 bgp prefix length of /24 ? Saku Ytti (Oct 01)
- Re: maximum ipv4 bgp prefix length of /24 ? Matthew Petach (Oct 01)
- Re: maximum ipv4 bgp prefix length of /24 ? Seth David Schoen (Oct 01)
- Re: maximum ipv4 bgp prefix length of /24 ? Matthew Petach (Oct 01)
- Re: maximum ipv4 bgp prefix length of /24 ? Jon Lewis (Oct 01)
- Re: maximum ipv4 bgp prefix length of /24 ? Saku Ytti (Oct 02)
- Re: maximum ipv4 bgp prefix length of /24 ? Seth David Schoen (Oct 01)
- <Possible follow-ups>
- Re: maximum ipv4 bgp prefix length of /24 ? William Herrin (Oct 01)
- Re: maximum ipv4 bgp prefix length of /24 ? Jakob Heitz (jheitz) via NANOG (Oct 01)
- Re: maximum ipv4 bgp prefix length of /24 ? William Herrin (Oct 01)
- Re: maximum ipv4 bgp prefix length of /24 ? Jakob Heitz (jheitz) via NANOG (Oct 01)
- Re: maximum ipv4 bgp prefix length of /24 ? William Herrin (Oct 02)
- Re: maximum ipv4 bgp prefix length of /24 ? William Herrin (Oct 01)
- Re: maximum ipv4 bgp prefix length of /24 ? Matthew Petach (Oct 01)