From owner-freebsd-hardware Thu Aug 26 10:24:39 1999 Delivered-To: freebsd-hardware@freebsd.org Received: from feral.com (feral.com [192.67.166.1]) by hub.freebsd.org (Postfix) with ESMTP id 0775215D3D for ; Thu, 26 Aug 1999 10:24:25 -0700 (PDT) (envelope-from mjacob@feral.com) Received: from semuta.feral.com (semuta [192.67.166.70]) by feral.com (8.8.7/8.8.7) with ESMTP id KAA27306; Thu, 26 Aug 1999 10:22:32 -0700 Date: Thu, 26 Aug 1999 10:22:30 -0700 (PDT) From: Matthew Jacob Reply-To: mjacob@feral.com To: "Louis A. Mamakos" Cc: "Kenneth D. Merry" , freebsd-hardware@FreeBSD.ORG Subject: Re: what's the best working gigabit ether card... In-Reply-To: <199908261718.NAA05996@whizzo.transsys.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > > > > Another thing to keep in mind, if you're going to be connecting more than > > two machines, is that the Alteon switches are the only ones that I've seen > > that currently claim to do jumbo frames. They cost a bundle, but they're > > more or less the only game in town. My guess is that will change > > eventually. > > Packet Engines is also doing jumbo sized Gigabit ethernet in their > switches. This was something that was a requirement at work (UUNET) > since the backbone already carries 4470 bytes frames, and we didn't > want to have to fragment going over gigabit ethernet plumbing. > > You might also check around for an Internet Draft recently published > on how to encapsulate jumbo-sized frames. This can be problematic > for some protocols that use SNAP encapsulation since the ethernet > type field is used as a length; this normally isn't a problem since > the lengths were smaller then the range of ethernet types assigned. With > jumbo frames, this is no longer true. > > In our case, this came up in the context of encapsulating CLNS frames > on the wire. This is used commonly on ISP backbones that run Integrated > IS-IS routing protocol as their IGP. > Cool, thanks all. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message