Some of it is Extreme, some of it is Arris.
The only issue I've had with anything Brocade\Foundry is lack of features in older platforms. They've always been solid for me.
From: "Daniel Corbe" <dcorbe@hammerfiber.com>
To: "Julien Goodwin" <nanog@studio442.com.au>
Cc: "nanog list" <nanog@nanog.org>
Sent: Wednesday, October 31, 2018 9:51:14 PM
Subject: Re: Brocade SLX Internet Edge
I’m just going to echo what a few others have been saying. Brocade (now
Extreme) have come a long way since the Foundry days; and the SLX isn’t
based on the old Netiron code. The platform is a completely different
animal.
I’ve been a happy Brocade customer for a while now.