Thoughts on increasing MTUs on the internet
michael.dillon at bt.com
michael.dillon at bt.com
Fri Apr 13 09:03:53 UTC 2007
> No, I doubt it will change. The CRC algorithm used in Ethernet is
> already strained by the 1500-byte-plus payload size. 802.3
> won't extend
> to any larger size without running a significant risk of the CRC
> algorithm failing.
I believe this has already been debunked.
> From a practical side, the cost of developing, qualifying,
> and selling
> new chipsets to handle jumbo packets would jack up the cost of inside
> equipment. What is the payback? How much money do you save going to
> jumbo packets?
I believe that the change is intended to apply to routers and the
ethernet switches that interconnect them in PoPs and NAPs and exchange
points. Therefore the cost of a small chipset modification is likely to
be negligible in the grand scheme of things.
As for numbers, it is not dollar figures that I want to see. I would
like the people who have jumbo packets inside their end-user networks to
run some MTU discovery and publish a full MTU matrix on all paths on the
Internet. That way we can all see where there is end-to-end support for
large MTUs and people who want to make buying decisions on this basis
will have something other than vendor assurances to show that a network
supports jumbograms.
--Michael Dillon
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