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Re: MAE-EAST Moving? from Tysons corner to reston VA.
In message <87256900.00780D04.email@example.com>, firstname.lastname@example.org. com writes: > > > >On 06/16/2000 at 11:10:55 AST, John Fraizer <nanog@EnterZone.Net> wrote: >> If I'm not mistaken, 9000bytes is the max. > >I don't understand how ethernets, at the MAC layer, can support frames >greater than 1500 bytes. Looking at the MAC frame format, we have: > >ethernet DIX V2 DA(16 bits), SA(16 bits), type (16 bits), data >IEEE 802.3 DA(16 bits), SA(16 bits), length (16 bits), LPDU (802.2) > >The traditional way to distinguish between the 2 formats depends on the >length value (in 802.3) being no greater than 1500, and on the type value >(in DIX) being greater than 0x05dc (1500 decimal). > >Assuming you're still going to allow both formats on the same lan, how does >it work if the length is greater than 1500? See http://search.ietf.org/internet-drafts/draft-kaplan-isis-ext-eth-02.txt for one proposal. --Steve Bellovin