[Tsv-art] Tsvart last call review of draft-ietf-6man-ipv6-alt-mark-06
Yoshifumi Nishida via Datatracker <noreply@ietf.org> Wed, 16 June 2021 08:48 UTC
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From: Yoshifumi Nishida via Datatracker <noreply@ietf.org>
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Date: Wed, 16 Jun 2021 01:48:36 -0700
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Subject: [Tsv-art] Tsvart last call review of draft-ietf-6man-ipv6-alt-mark-06
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Reviewer: Yoshifumi Nishida Review result: On the Right Track This document has been reviewed as part of the transport area review team's ongoing effort to review key IETF documents. These comments were written primarily for the transport area directors, but are copied to the document's authors and WG to allow them to address any issues raised and also to the IETF discussion list for information. When done at the time of IETF Last Call, the authors should consider this review as part of the last-call comments they receive. Please always CC tsv-art@ietf.org if you reply to or forward this review. Summary: I think this document is on the right track, but it needs to address the following points to be published as a PS document. 1: I think the doc should provide a high-level view of the usage of this method. For example, it is not clear to me how measurement nodes interact each other, exchange and compare information, etc. If it is provided in other documents, it should be referred. 2: Section 5.1: "By counting the number of packets in each batch and comparing the values measured by different network nodes along the path, it is possible to measure the packet loss occurred in any single batch between any two nodes." -> It is not clear to me how two nodes exchanges the measured counts. This point should be clarified even if if it's out-of-scope of the document. 3: Section 5.1: "In a few words this implies that the length of the batches MUST be chosen large enough so that the method is not affected by those factors." -> It would be better to have recommended length values here. At least, it would be better to provide some guidances to decide the value. 4: Section 5.1: Can we change the length of batch in the middle of data transfer? Also, is there any concerns to use different length for each flow? I think it would be better to specify on these points. 5: Section 5.2: I am wondering if this approach requires time sync between nodes or not. This point should be clarified. 6: Section 5.2: "Whenever the L bit changes and a new batch starts, a network node can store the timestamp of the first packet of the new batch, that timestamp can be compared with the timestamp of the first packet of the same batch on a second node to compute packet delay." -> It is not clear to me how two nodes compare the stored timestamps. This point should be clarified. 7: Section 5.2: What's the benefits for using the approach described in 1.? The use cases for it should be described. -- Yoshi
- [Tsv-art] Tsvart last call review of draft-ietf-6… Yoshifumi Nishida via Datatracker
- Re: [Tsv-art] Tsvart last call review of draft-ie… Giuseppe Fioccola
- Re: [Tsv-art] Tsvart last call review of draft-ie… Yoshifumi Nishida
- Re: [Tsv-art] Tsvart last call review of draft-ie… Giuseppe Fioccola
- Re: [Tsv-art] Tsvart last call review of draft-ie… Yoshifumi Nishida