I have not found x-flow to have the accuracy I would like. Either there's a loss of information due to sampling and such low-usage interfaces (or VLANs in this case) are lost in the noise or there's information overload due to no sampling at all.

I have seen very few platforms expose counter information about VLANs in the same way they do regular interfaces. Some Juniper platforms, Mikrotik, and I hear some Aristas as well.

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Mike Hammett
Intelligent Computing Solutions

Midwest Internet Exchange

The Brothers WISP

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From: "Steve Meuse" <smeuse@mara.org>
To: "Mike Hammett" <nanog@ics-il.net>
Cc: "nanog" <nanog@nanog.org>
Sent: Friday, December 6, 2019 4:20:08 PM
Subject: Re: Arista Switch Suggestion

You should be able to do that with Sflow, which they all/most support.

Also, this seems like standard Ifmib stuff, any snmp poller should be able to handle that, from a metrics perspective . 

-Steve

On Fri, Dec 6, 2019 at 4:31 PM Mike Hammett <nanog@ics-il.net> wrote:

I asked over at https://puck.nether.net/mailman/listinfo/arista-nsp a couple weeks ago, but didn't get an answer, so I have moved to a larger group.

I understand that some Arista switches will expose each VLAN in SNMP so I can monitor traffic on a VLAN independently of over VLANs on that same physical interface. Some of them don't.

Which ones do?

I prefer a solid used switch.

10G ports are fine.

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Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com

Midwest-IX
http://www.midwest-ix.com