Dear Menachem,

Thanks a lot for the review and apologies for delayed replied. We are preparing 
-15 and addressed your comments here:

https://author-tools.ietf.org/diff?doc_1=draft-ietf-opsawg-ipfix-on-path-telemetry-14&url_2=https://raw.githubusercontent.com/network-analytics/draft-ietf-opsawg-ipfix-on-path-telemetry/refs/heads/main/draft-ietf-opsawg-ipfix-on-path-telemetry-15.txt

> I believe that the introduction would be clearer if the instructions to IANA 
> about the new elements were not included in the Introduction section but left 
> for the IANA section later in the document. I also think that the measurement 
> interval period should be mentioned in the introduction and added to the 
> diagram in Figure 1

You are refering to figure 1 which compares the IP performance with the IANA 
registry. This is done by purpose to describe the relationship between the two 
before going to Section 3 and 4 where each are being addressed.

> In section 3.3.5 it was not clear to me how the T0 and Tf are determined by 
> each node. Section 7.4 Measurement Interval does not explain what triggers 
> the start and end of the measurement interval. But maybe I have missed this. 
> 4.

T0 and Tf are being determined on the OAM nodes described in the following 
section "3.3.6. Roles". I updated Section 7.4 to give more clarity how the 
delay is being measured and accounted in flows.

Please let me know wherever this addresses your comments.

Best wishes
Thomas

-----Original Message-----
From: Menachem Dodge via Datatracker <nore...@ietf.org> 
Sent: Saturday, February 8, 2025 8:40 PM
To: ops-...@ietf.org
Cc: draft-ietf-opsawg-ipfix-on-path-telemetry....@ietf.org; last-c...@ietf.org; 
opsawg@ietf.org
Subject: [OPSAWG]Opsdir last call review of 
draft-ietf-opsawg-ipfix-on-path-telemetry-14

Reviewer: Menachem Dodge
Review result: Has Nits

Reviewer: Menachem Dodge
Review result: Has Nits

I have reviewed this document as part of the Ops area directorate's ongoing 
effort to review all IETF documents being processed by the IESG.  These 
comments were written primarily for the benefit of the Ops area directors.
Document editors and WG chairs should treat these comments just like any other 
last-call comments.

The document defines an additional 4 IPFIX Information Elements in order to 
export measured delay of packet flows at transit and decapsulating nodes.

The document is readable and understandable.

Nits
====

1. In the first paragraph of the introduction section the word "need" is used 
twice but I believe that it should be "needs" with an 's'. 2. I believe that 
the introduction would be clearer if the instructions to IANA about the new 
elements were not included in the Introduction section but left for the IANA 
section later in the document. I also think that the measurement interval 
period should be mentioned in the introduction and added to the diagram in 
Figure 1. 3. In section 3.3.5 it was not clear to me how the T0 and Tf are 
determined by each node. Section 7.4 Measurement Interval does not explain what 
triggers the start and end of the measurement interval. But maybe I have missed 
this. 4. Section A.1 the title: "Aggregated On-Path Dealay Examples" should be 
"Delay".

Thank you


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