Re: Arista 7280QR-C36 Viability

[Alberto Vargas via NANOG <nanog () lists nanog org>]

Last year, during a PoC, we installed 9M IPv4 and 1M IPv6 routes into the FIB of a 7280CR3-32D4. The router continued 
operating even after the FIB space was exhausted. Consequently, I expect the same behavior from the Arista 7280QR-C36, 
given that both use the same operating system.


From: Jon Lewis via NANOG <nanog () lists nanog org>
Date: Wednesday, 3 December 2025 at 22:41
To: nanog () lists nanog org <nanog () lists nanog org>
Cc: nanog () lists nanog org <nanog () lists nanog org>, Jon Lewis <jlewis () lewis org>
Subject: Re: Arista 7280QR-C36 Viability


> On 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?

If you let it run out of FIB space, those routes that don’t make it into the FIB blackhole.  FIB compression works 
quite well though, especially if you enable it. :)



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