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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: TCP/IP Framing AssistsCopying the list on a response to a question of general interest ... Charles Monia writes: > At the last IPS WG, you said you felt there was a possibility that the IETF > community might be persuaded to accept some sort of framing assists for > TCP/IP (At the time, I characterized this as 'SCTP lite'). > > Has there been any progress on this front? This could impact the outcome of > the common encapsulation effort. It is still a definite possibility. There has been progress, but it's not exactly visible, yet. As indicated in the IPS Agenda for Minneapolis, work on this will be conducted through the tsvwg Working Group - I have not seen a Minneapolis Agenda for tsvwg, so I don't know if/when this issue will be taken up. I'll try to get an update (no discussion) on this topic included in the initial 10 minutes of Agenda Bashing and Administrivia. For the FCIP/iFCP common encapsulation, I would recommend separating framing from data representation, and adopting an approach along the lines of that in Section 1.2.8 of the iSCSI draft in which framing logically occurs between the block storage protocol and TCP. In particular, this means that the 0xfcfcfcfc reserved value/word-stuffing approach in Section 2 of the weber draft should be specified separately as a "shim" protocol at this level if it is to be carried forward - this is the right way to think about it in any case because any protocol headers at higher layers in the stack have to be word-stuffed if the reserved value sequence (4 occurrences of the reserved value in the weber draft) occurs there. The result could be three TCP framing approaches - SCTP-lite - Markers (iSCSI appendix) - Reserved value/word stuffing (weber draft) Each could be independently chosen/used by any of the IPS block storage protocols, provided that suitable negotiation mechanisms are specified to make sure that both sides of a connection understand exactly what is being used in which direction. --David --------------------------------------------------- David L. Black, Senior Technologist EMC Corporation, 42 South St., Hopkinton, MA 01748 +1 (508) 435-1000 x75140 FAX: +1 (508) 497-8500 black_david@emc.com Mobile: +1 (978) 394-7754 ---------------------------------------------------
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