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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Jumbo Frames (was Re: MAE-EAST Moving? from Tysons corner toreston VA. )
Which is one of the reasons that we specified 1600 as the frame size for most line disciplines, such as PPP over Frame Relay, etc., since circa 1992.... PPP itself is 1500, matching ethernet, in the vain hope that folks would remember to distinguish "packet" data size from "frame" size. Also, I'd like to note that jumbograms render the TCP checksum nearly useless. It's only an effective 7 bits of strength, which one might describe as "minimally" useful. [email protected] wrote: > > When 1500 byte frames from the customer's LAN enter the customer's router and enter some form of IP tunnel, then a core fabric which supports larger than 1500 byte frames will not cause fragmentation. It's not necessary to do the full jumbo size frames. I suspect that supporting two levels of encapsulation will be enough in 99.9% of the cases. For the sake of argument, what would be the downside of using a 2000 byte MTU as the minimum MTU in your core? > [email protected] Key fingerprint = 17 40 5E 67 15 6F 31 26 DD 0D B9 9B 6A 15 2C 32
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