[40806] in North American Network Operators' Group
Re: Ethernet NAPs (was Re: Miami ...)
daemon@ATHENA.MIT.EDU (RJ Atkinson)
Wed Aug 22 20:47:58 2001
Message-Id: <5.1.0.14.2.20010822203648.00a36d70@10.30.15.2>
Date: Wed, 22 Aug 2001 20:41:10 -0400
To: Leo Bicknell <bicknell@ufp.org>
From: RJ Atkinson <rja@inet.org>
Cc: Nanog <nanog@merit.edu>
In-Reply-To: <20010822194343.A93930@ussenterprise.ufp.org>
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Errors-To: owner-nanog-outgoing@merit.edu
At 19:43 22/08/01, Leo Bicknell wrote:
>_ALL_ devices on a layer-2 fabric need to have the same MTU. That
>means if there are any FastEthernet or Ethernet connected members
>1500 bytes is it. It also means if you pick a larger value (4470,
>9k) _ALL_ members must use the same value.
Only devices exchanging frames with each other need have the same
MTU. One could easily imagine one 802.1q VLAN with MTU N and
a different 802.1q VLAN with MTU Y all on the same switch,
to give a trivial example. Some exchanges already use VLANs
with their GigE switches for a variety of business reasons.
Ran
rja@inet.org
