Date: Thu, 9 Oct 2003 11:02:39 -0400 From: Don Bowman <don@sandvine.com> To: "'Peter J. Blok'" <pblok@inter.NL.net>, freebsd-net@freebsd.org Subject: RE: Giga-bit switches Message-ID: <FE045D4D9F7AED4CBFF1B3B813C85337035E3A8D@mail.sandvine.com>
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From: Peter J. Blok [mailto:pblok@inter.NL.net] > Hi, > > This is just a warning. I am setting up a Giga-bit network > trying to use Jumbo > frames. For NIC the ability to do larger frames is usually > listed, but that > doesn't seem to be the case for switches. > > I have bought a Netgear GS104 switch, which does list a > buffer per port of > 12K. However, according to Netgear support, it is not > supported and working. > They just say that there is no mentioning of Jumbo frame > support, therefore > it is not supported. Even on the more expensive Netgear > switches it is not > listed, so it is trial-on-error policy. > > My understanding is that the Giga-bit definition includes > large frame support > and if you claim to have a Giga-bit switch you should support > large frames, > unless specifically excluded. jumbo frames are not part of the standard, and are in general poorly supported. For some cisco devices, they do 'mini giants', e.g. ~1600 mtu. Other cisco devices will support 9K frames, but @ the expensive of lowering the overall buffering (all frames are assumed to be 9K now, so ~1/4 of the packets may be buffered). for cisco devices, the support will be on a line card by linecard basis.
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