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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: 10 gige experience
On Fri, 11 May 2001, Chris Wedgwood 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.) > > Not answering your question, but GigE can use larger frames than 1500 > bytes, however, if you wish to send these outside your network, > you'll likely need to fragment them this somewhat less useful... of > course, Jumbo Frames are still useful within your network, but then > again most switches don't support them[1]. Which is why I said 'default' MTU of 1500. I think it should have been a requirement of all 100TX devices to be able to accept FDDI sized packets, a requirement of GIGE to switch FDDI sized packets, etc.. Thats not what happened. The problem is that there is no graceful way to handle mixed MTU's at that layer. As a result, the default is to use legacy sized MTUs, which results in new equpment which can not handle the larger MTUs, resulting in the further delay of end-to-end jumbogram support. At some point, they need to draw a line and say that reception and switching of large >1500 byte packets must be supported and generation of such packets should be an option. This will finally make is possible for people to jumbogram enable their networks.
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