Point to Point Ethernet
swmike at swm.pp.se
Wed Jul 8 10:42:10 CDT 2009
On Wed, 8 Jul 2009, William Herrin wrote:
> At the cost of low-volume production run hardware which is A. much more
> expensive (because of the low volume), B. restricted to a few supported
> routers and C. less thoroughly tested. I don't see how you come out
> ahead in that calculation.
The only way to do it would be to make this a standard in the next
evolution of Ethernet, perhaps 400GE. I don't see this happening though.
But the only REASON to do it, would be to lessen overhead for small
packets. I don't see how you can not see this.
> My understanding is that 9000 is a standard for GigE and up but for
> compatibility with earlier ethernets it's not the default. You have to
> explicitly configure it and you must configure it the same on every host
> and switch within the broadcast zone. For a point to point link, this
> should be trivial.
No, IEEE says only 1500 payload MTU. This was discussed in 40GE and 100GE,
and IEEE left the framesize the same way it's always been.
> I gather from your list that not everything which supports gige also
> supports jumbo frames but that most things do.
Yes, but that doesn't make it standard. It makes it common.
Mikael Abrahamsson email: swmike at swm.pp.se
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