[37400] in North American Network Operators' Group
Re: 10 gige experience
daemon@ATHENA.MIT.EDU (Richard A. Steenbergen)
Thu May 10 14:22:44 2001
Date: Thu, 10 May 2001 14:20:10 -0400 (EDT)
From: "Richard A. Steenbergen" <ras@e-gerbil.net>
To: Greg Maxwell <gmaxwell@martin.fl.us>
Cc: nanog@merit.edu
Message-ID: <Pine.BSF.4.21.0105101411560.98098-100000@overlord.e-gerbil.net>
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On Thu, May 10, 2001 at 11:12:21AM -0400, Greg Maxwell wrote:
>
> On Thu, 10 May 2001, John Fraizer wrote:
>
> > > Anyone know any good articles on 10GB ethernet? I am specifically
> > > intrested if they have removed some of the legacy requirements that
> > > hamper gigabit ethernet (such as a default MTU of 1500, half-duplex,
> > > etc.)
> >
> > Half-duplex? The last time I checked, my GigE equipment didn't default
> > to half-duplex.
>
> No I wouldn't expect it to, nor did I state anything about defaulting
> to half. There is no purpose for half-duplex in GIGE, even the few
> GIGE hubs I've seen are buffered and user congestion control to allow
> full duplex operation. The possibility of half-duplex mode just adds
> unneeded cruft and additional failure modes.
If it didn't support half-duplex, it wouldn't technically be 802.3
ethernet. Full duplex is what happens when you remove CSMA/CD.
I'm sure 99% of people out there have absolutily no need or desire for
half duplex gige or 10gige, and I'm also sure 99% of people out there
would be far better served by a larger MTU. Unfortunantly it's the other
1% at IEEE who write the spec.
--
Richard A Steenbergen <ras@e-gerbil.net> http://www.e-gerbil.net/ras
PGP Key ID: 0x138EA177 (67 29 D7 BC E8 18 3E DA B2 46 B3 D8 14 36 FE B6)
