Document: draft-ietf-opsawg-discardmodel
Title: Information and Data Models for Packet Discard Reporting
Reviewer: Satoru Matsushima
Review result: Ready with Nits


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

Overall this draft was well written and well covered various discard cases, 
TTL expired, exceed MTU size, uRPF, etc., for example.

Nits:
- It would be better to clarify which counter type should be used for SR-MPLS cases, either invalid-label, or invalid-sid;

- RFC8704 might be considered as an informational reference for uRPF;

- In addition to uRPF, "ingress filtering" in RFC2827/3704 would cover more wider discard cases at ingress nodes:

- It would be nice if the draft considered that how many ICMP packets were send, or suppressed to the corresponding discard events, 
  such as TTL expired, exceed MTU size, or rejected by policies.