Date: Thu, 26 Aug 1999 12:57:16 -0600 (MDT) From: "Kenneth D. Merry" <ken@kdm.org> To: louie@TransSys.COM (Louis A. Mamakos) Cc: mjacob@feral.com, freebsd-hardware@FreeBSD.ORG Subject: Re: what's the best working gigabit ether card... Message-ID: <199908261857.MAA84266@panzer.kdm.org> In-Reply-To: <199908261718.NAA05996@whizzo.transsys.com> from "Louis A. Mamakos" at "Aug 26, 1999 01:18:56 pm"
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Louis A. Mamakos wrote... > > > > 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. That's very good to know, thanks. I wonder why they don't mention it on their web page? Another odd thing is that they claim there is a 3rd party FreeBSD driver for their Gigabit ethernet PCI card, although I don't know of one. (There's certainly not one in the tree.) > 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. Hmm, thanks for the info. Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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