nanog mailing list archives
Re: Jumbo frame Question
From: John Kristoff <jtk () cymru com>
Date: Mon, 29 Nov 2010 13:10:27 -0600
On Fri, 26 Nov 2010 15:24:57 -0500 Randy Bush <randy () psg com> wrote:
the reason ieee has not allowed upping of the frame size is that the crc is at the prudent limits at 1500. yes, we do another check above the frame (uh, well, udp4 may not), but the ether spec can not count on that.
I wasn't there, but I paid some attention to the discussion of jumbos when it would frequently pop up on comp.dcom.lans.ethernet. Rich Seifert, who was involved, would jeer jumbos and point out the potential problems. A search in that group with his name and jumbo frames should bring up some useful background. In a nutshell, as I recall, one of the prime motivating factors for not standardizing jumbos was interoperability issues with the installed base, which penalizes other parts of the network (e.g. routers having to perform fragmentation) for the benefit of a select few (e.g. modern server to server comms). I also seem to recall Rich had also once said something to the effect that it might have been nice if larger frames were supported at the onset of Ethernet's initial development, but alas, such is life and it's simply too late now. The "installed base defeats us". John
Current thread:
- RE: Jumbo frame Question, (continued)
- RE: Jumbo frame Question Richard Graves (RHT) (Nov 26)
- RE: Jumbo frame Question George Bonser (Nov 26)
- Re: Jumbo frame Question Saku Ytti (Nov 26)
- Re: Jumbo frame Question Valdis . Kletnieks (Nov 26)
- Re: Jumbo frame Question Saku Ytti (Nov 26)
- Re: Jumbo frame Question Saku Ytti (Nov 26)
- RE: Jumbo frame Question Brandon Kim (Nov 26)
- RE: Jumbo frame Question Mikael Abrahamsson (Nov 26)
- Re: Jumbo frame Question Randy Bush (Nov 26)
- RE: Jumbo frame Question George Bonser (Nov 26)
- Re: Jumbo frame Question Mikael Abrahamsson (Nov 26)
- Re: Jumbo frame Question John Kristoff (Nov 29)
- Re: Jumbo frame Question Jack Bates (Nov 29)
- Re: Jumbo frame Question Douglas Otis (Nov 29)
- need a contact Geo. (Nov 26)
- Re: Jumbo frame Question Joel Jaeggli (Nov 26)
- Re: Jumbo frame Question Matthew Petach (Nov 26)
- Re: Jumbo frame Question Wil Schultz (Nov 26)