Re: Arista 7280QR-C36 Viability

[Tom Beecher via NANOG <nanog () lists nanog org>]

> At the risk of the Streisand effect, what am I missing about the Arista
> 7280QR-C36? It looks like a great router for small ISPs (great price, large
> packet buffers, good port selection, meaningful hardware routes). That
> said, it looks to be right on the border of DFZ viability. It supports
> "over 1M" routes, but I currently have about 1,036,824 in my route table.
> How much over is "over"? What happens in EOS when it goes over?


1. That's a lot of ports that are gonna go unused in a network edge use
case.
2. There is always some fudge from the vendor provided scale numbers. You
can usually exceed them a little bit, but how much very much depends. When
you exhaust the FIB memory, it's gonna stop working. Best case it crashes
and reloads, worst case it wedges and needs a 1 finger salute.

This box isn't designed to be an edge router. You couldn't take a full V4
and V6 table from a single provider on it without it falling over. Could
you possibly make it work in some environments? Sure. But just because you
can, etc, etc

On Mon, Dec 1, 2025 at 8:57 AM Mike Hammett via NANOG <nanog () lists nanog org>
wrote:

> At the risk of the Streisand effect, what am I missing about the Arista
> 7280QR-C36? It looks like a great router for small ISPs (great price, large
> packet buffers, good port selection, meaningful hardware routes). That
> said, it looks to be right on the border of DFZ viability. It supports
> "over 1M" routes, but I currently have about 1,036,824 in my route table.
> How much over is "over"? What happens in EOS when it goes over?
>
> What's the "next best" box for that role?
>
>
>
> -----
> Mike Hammett
> Intelligent Computing Solutions
> http://www.ics-il.com
>
> Midwest-IX
> http://www.midwest-ix.com
>
>
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> NANOG mailing list
>
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