Last Call Review of draft-ietf-lsr-ospf-reverse-metric-07
review-ietf-lsr-ospf-reverse-metric-07-genart-lc-fossati-2022-09-09-00

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Document: draft-ietf-lsr-ospf-reverse-metric-??
Reviewer: Thomas Fossati
Review Date: 2022-09-09
IETF LC End Date: 2022-09-20
IESG Telechat date: Not scheduled for a telechat

Summary:

This is a clear and easy to read document, thank you authors for the
great job.

I only have a couple of very minor issues / clarifications.  The tail of
my review consists of a bunch of typographic nits and one suggestion for
how to align the Contributors section to most recent interpretations of
the RFC Style Guide (RFC7322).

Major issues: none

Minor issues:

* It looks that the H and O flags are mutually exclusive?  If so, I
  think the fact should be made explicit.  (This applies to both the
  reverse and reverse TE metrics.)

* "If authentication is being used [...] then the Cryptographic
  Authentication TLV [RFC5613] SHOULD also be used to protect the
  contents of the LLS block."  Please explain why this is not a MUST,
  i.e., under which conditions it is OK to not authenticate the LLS
  block.

Nits/editorial comments:

Section 1., paragraph 1:
OLD:
    Thus the configuration on R1 influences the traffic that it forwards

NEW:
    Thus, the configuration on R1 influences the traffic that it
    forwards


Section 2.1., paragraph 2:
OLD:
    when a large number of CE routers connect to a PE router, an

NEW:
    when many CE routers connect to a PE router, an


Section 2.1., paragraph 3:
OLD:
    router to advertise the maximum metric for that link and also to
    [...]
    returns to using its provisioned metric for the link and also stops

NEW:
    router to advertise the maximum metric for that link and to
    [...]
    returns to using its provisioned metric for the link and stops


Section 2.2., paragraph 2:
OLD:
    reverse metric to some or all of the R1-RN routers.  When the R1-RN

NEW:
    reverse metric to some or all the R1-RN routers.  When the R1-RN


Section 3., paragraph 1:
OLD:
    This ensures that the RM signaling is scoped ONLY to each specific
    [...]
    Metric TLV in its Hello packets on the link as long as it needs its
    [...]

NEW:
    This ensures that the RM signaling is scoped only to each specific
    [...]
    Metric TLV in its Hello packets on the link for as long as it needs
    its [...]


Section 6., paragraph 4:
OLD:
    instability in the network due to churn in their metric due to
    signaling of RM:

NEW:
    instability in the network due to churn in their metric caused by
    signaling of RM:


Section 6., paragraph 7:
OLD:
    RM metric signaling based on the RM metric signaling initiated by
    some other router.

NEW:
    RM metric signaling based on the RM metric signaling initiated by
    some other routers.


Section 6., paragraph 10:
OLD:
    (also refer to Section 7 for details on enablement of RM).  The
    rules [...]

NEW:
    (refer to Section 7 for details on enablement of RM).  The rules
    [...]

Section 7., paragraph 5:
OLD:
    For the use case in Section 2.1, it is RECOMMENDED that the network
    operator limit the period of enablement of the reverse metric

NEW:
    For the use case in Section 2.1, it is RECOMMENDED that the network
    operator limits the period of enablement of the reverse metric


Section 9., paragraph 1:
OLD:
    This document allocates code points from Link Local Signalling TLV
    Identifiers registry for the TLVs introduced by it as below.

NEW:
    This document allocates code points from the Link Local Signalling
    TLV Identifiers registry for the introduced TLVs.


Regarding the Contributors section, I think BCP is to make it similar to
the Authors section, e.g.:

Section 11., paragraph 1:
OLD:
    Thanks to Jay Karthik for his contributions to the use cases and the
    review of the solution.

NEW:
    Jay Karthik
    Cisco Systems, Inc.
    Email: jakarthi@cisco.com
 
    Jay contributed to the use cases and the review of the solution.


If you are using kramdown-rfc you can add this snippet after your
"author" block

contributor:
 -  name: Jay Karthik
    email: jakarthi@cisco.com
    contribution: Jay contributed to the use cases and the review of the solution.

Otherwise (xml2rfc):

  <contact initials="J." surname="Karthik" fullname="Jay Karthik">
    <organization>Cisco Systems, Inc.</organization>
    <address>
      <email>jakarthi@cisco.com</email>
    </address>
  </contact>
  <t>
    Jay contributed to the use cases and the review of the solution.
  </t>