[tcpm] New AccECN version: draft-ietf-tcpm-accurate-ecn-20
Bob Briscoe <ietf@bobbriscoe.net> Mon, 25 July 2022 14:46 UTC
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Date: Mon, 25 Jul 2022 10:46:09 -0400
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Subject: [tcpm] New AccECN version: draft-ietf-tcpm-accurate-ecn-20
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tcpm, Minor diffs from 19 to 20; Summary: 1, Section 3.2.3. The AccECN Option https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn-20#section-3.2.3 As promised, we've added a stronger motivation for the RECOMMENDations for partial implementations. 2. Section 7 IANA Considerations: https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn-20#section-7 Added the ExIDs of the two options used by experimental implementations. Bob On 25/07/2022 15:21, internet-drafts@ietf.org wrote: > A New Internet-Draft is available from the on-line Internet-Drafts directories. > This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF. > > Title : More Accurate ECN Feedback in TCP > Authors : Bob Briscoe > Mirja Kühlewind > Richard Scheffenegger > Filename : draft-ietf-tcpm-accurate-ecn-20.txt > Pages : 61 > Date : 2022-07-25 > > Abstract: > Explicit Congestion Notification (ECN) is a mechanism where network > nodes can mark IP packets instead of dropping them to indicate > incipient congestion to the end-points. Receivers with an ECN- > capable transport protocol feed back this information to the sender. > ECN was originally specified for TCP in such a way that only one > feedback signal can be transmitted per Round-Trip Time (RTT). Recent > new TCP mechanisms like Congestion Exposure (ConEx), Data Center TCP > (DCTCP) or Low Latency Low Loss Scalable Throughput (L4S) need more > accurate ECN feedback information whenever more than one marking is > received in one RTT. This document updates the original ECN > specification to specify a scheme to provide more than one feedback > signal per RTT in the TCP header. Given TCP header space is scarce, > it allocates a reserved header bit previously assigned to the ECN- > Nonce. It also overloads the two existing ECN flags in the TCP > header. The resulting extra space is exploited to feed back the IP- > ECN field received during the 3-way handshake as well. Supplementary > feedback information can optionally be provided in a new TCP option, > which is never used on the TCP SYN. The document also specifies the > treatment of this updated TCP wire protocol by middleboxes. > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/ > > There is also an HTML version available at: > https://www.ietf.org/archive/id/draft-ietf-tcpm-accurate-ecn-20.html > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-accurate-ecn-20 > > > Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts > > > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm -- ________________________________________________________________ Bob Briscoe http://bobbriscoe.net/
- [tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-2… internet-drafts
- [tcpm] New AccECN version: draft-ietf-tcpm-accura… Bob Briscoe
- [tcpm] AccECN: summary text about omitting unchan… Neal Cardwell
- Re: [tcpm] AccECN: summary text about omitting un… Scheffenegger, Richard
- Re: [tcpm] AccECN: summary text about omitting un… Joe Touch
- Re: [tcpm] AccECN: summary text about omitting un… Scheffenegger, Richard