Fibre Channel Over Ethernet (FCoE) and Convergence
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Uploader Comments (BrocadeTech)
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+1 for the name Chip Copper!
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To get the DCB info at ieee, search Google : dcbridges ieee
For the t11 doc, search Google : T11/09-056v5
YouTube didn't seem to accept putting the actual links in my comment. :)
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Hi avira2009, this info might be interesting:
Layer 2 Data Center Ethernet (aka DCB) at ieee:
* lossless - "The goal of this mechanism is to ensure zero loss due to
congestion in DCB networks. "
Layer 3+ Fibre Channel over Ethernet at t11:
Look for T11/09-056v5
"FIBRE CHANNEL BACKBONE - 5 (FC-BB-5) REV 2.00 June 4, 2009"
* lossless is discussed all throughout the pdf as a firm requirement for Layer 2
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Nice try, but networking practitioners know what reliable means. TCP is reliable, it manages acknowledgement and retransmissions. DCE isn't.
Ethernet and DCE aren't lossless. If T11 calls them so then they are, at best, wrong. They should know better.
BTW, DCE just does better under load, it still will drop packets to handle congestion. Its not deterministic.
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Someone ought to clue in this guy about basic network theory. A network cannot be both deterministic and reliable. He says it about FC then he says it about DCE! Then he calls them lossless!!
Clue: Both DCE and FC have CRC fields in their frame format. Think that check ever fails? When it does, does it require retransmit? How many? As needed? Goodbye deterministic. Oh it gives eventually? Goodbye reliable.
avira2009 2 years ago
I appreciate your comments, avira2009. I use these terms as they are used in practice, not theory. For example, backhoes and lightning cause "reliable" networks to be interrupted. You can only build reliability within the constraints of the physical world. Once you have met thresholds of a sufficiently high improbability of failure, its called reliable. Theoreticians cringe, but practitioners accept this meaning of the word.
I'll let you take up lossless with the ANSI T11 Committee. :)
BrocadeTech 2 years ago