nanog mailing list archives
Re: "Tactical" /24 announcements
From: Jon Lewis <jlewis () lewis org>
Date: Thu, 12 Aug 2021 13:57:11 -0400 (EDT)
On Thu, 12 Aug 2021, Nick Hilliard wrote:
Jon Lewis wrote on 12/08/2021 18:09:Arista. They call it FIB compression. They mention it's a trade-off, more memory and CPU utilization (keeping track of things) in exchange for being able to keep hardware that might otherwise be out of FIB space able to cope with full tables.it also causes non-deterministic fib resource consumption. On most edge deployments this won't matter, but it wouldn't be hard to cook up a topology that could fail in interesting ways. Overall fib compression is a net win, but you need to be careful with it.
Yeah...changes to the network could suddenly run such a box out of FIB resources, and you could easily be wrong when predicting how much longer a box has for it's "full routes" days...but the alternatives are "don't do full routes" or replace the box much sooner. In that respect, it's somewhat remarkable that Arista even developed the feature. "We can sell them newer hardware with larger FIB capabilities, or offer a software update that extends the life of the gear they've already bought." What company chooses the latter? :)
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Current thread:
- Re: "Tactical" /24 announcements, (continued)
- Re: "Tactical" /24 announcements Baldur Norddahl (Aug 13)
- Re: "Tactical" /24 announcements Masataka Ohta (Aug 14)
- Re: "Tactical" /24 announcements Jeff Tantsura (Aug 14)
- Re: "Tactical" /24 announcements Masataka Ohta (Aug 15)
- Re: "Tactical" /24 announcements Sabri Berisha (Aug 13)
- Re: "Tactical" /24 announcements Jon Lewis (Aug 12)
- Re: "Tactical" /24 announcements Mark Tinka (Aug 13)
- Re: "Tactical" /24 announcements Jon Lewis (Aug 12)
- Re: "Tactical" /24 announcements Tom Hill (Aug 12)
- Re: "Tactical" /24 announcements Nick Hilliard (Aug 12)
- Re: "Tactical" /24 announcements Jon Lewis (Aug 12)
- Re: "Tactical" /24 announcements Mark Tinka (Aug 13)
- Re: "Tactical" /24 announcements Mark Tinka (Aug 13)
- Re: "Tactical" /24 announcements Mark Tinka (Aug 13)
- Re: "Tactical" /24 announcements Mark Tinka (Aug 11)
- Re: "Tactical" /24 announcements Saku Ytti (Aug 14)
- Re: "Tactical" /24 announcements Mark Tinka (Aug 15)
- RE: "Tactical" /24 announcements Jakob Heitz (jheitz) via NANOG (Aug 16)
- Re: "Tactical" /24 announcements Randy Bush (Aug 16)
- Re: "Tactical" /24 announcements Saku Ytti (Aug 16)