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Add handling of all packets marked as CE #3455

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Add handling of all packets marked as CE #3455

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a5241b6
Add handling of all packets marked as CE
mirjak Feb 13, 2020
4112f50
Update draft-ietf-quic-transport.md
mirjak Feb 14, 2020
d6ca8a8
Update draft-ietf-quic-transport.md
mirjak Feb 14, 2020
4886482
Update draft-ietf-quic-transport.md
mirjak Feb 17, 2020
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12 changes: 6 additions & 6 deletions draft-ietf-quic-transport.md
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Expand Up @@ -3518,12 +3518,12 @@ use the following steps on receiving an ACK frame to validate ECN.
This step detects any erroneous network remarking from ECT(0) to ECT(1) (or
vice versa).

Another special case is when all packets are marked ECN-CE,
independent of the marking used, including Not-ECT. In this case
it could be a network element overwriting the ECN field of all packets and
thereby potentially concealing actual congestion information. Especially,
when it is recognized that Not-ECT packets get remarked to CE, ECN marking
should be disabled and any received CE feedback should be treated with caution.
Another special case is when all packets are marked ECN-CE, independent of the
marking used, including Not-ECT.If this is caused by a network element
erroneously overwriting the ECN code point field, it will also conceal actual
congestion information. Therefore, if a peer indicates that all received packets
are ECN-CE marked, endpoints MAY treat this as an ECN validation failure and
ignore any ECN-CE counts in acknowledgments.

Processing ECN counts out of order can result in validation failure. An
endpoint SHOULD NOT perform this validation if this ACK frame does not advance
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