As required by RFC 4858, this is the current template for the Document
Changes are expected over time. This version is dated 24 February 2012.
(1) What type of RFC is being requested (BCP, Proposed Standard,
Internet Standard, Informational, Experimental, or Historic)? Why
is this the proper type of RFC? Is this type of RFC indicated in the
title page header?
Informational is requested as indicated in the title page header.
(2) The IESG approval announcement includes a Document Announcement
Write-Up. Please provide such a Document Announcement Write-Up. Recent
examples can be found in the "Action" announcements for approved
documents. The approval announcement contains the following sections:
Micro-loops are transient forwarding loops that can occur among
routers using hop-by-hop forwarding. This document analyzes
the impact of using different Link State IGP implementations
in a single network with respect to micro-loops.
The analysis focuses on the SPF triggers and SPF delay algorithms.
Working Group Summary
The final version of the document has strong consensus in the WG. Input
from the WG was incorporated in the document.
The document is of high quality.
Two Routing Area Directorate reviews were done. The first was
done by Mike Shand around the time of working group adoption.
This review pointed out some issues related to terminology and phrasing,
as well as a generalization about the size of networks. These
issues were addressed by the authors.
The main issue raised by the second review (done by Tomonori Takeda)
was the fact the document was classified as Standards Track. This
was addressed by changing it to Informational.
Document Shepherd: Chris Bowers
Responsible Area Director: Martin Vigoureux
(3) Briefly describe the review of this document that was performed by
the Document Shepherd. If this version of the document is not ready
for publication, please explain why the document is being forwarded to
The document that passed WGLC still needed some editorial
work, so the Document Shepherd provided the following feedback.
This resulted in the publication of version 7, which addressed
the editorial issues.
(4) Does the document Shepherd have any concerns about the depth or
breadth of the reviews that have been performed?
The Document Shepherd has no concerns in this respect.
(5) Do portions of the document need review from a particular or from
broader perspective, e.g., security, operational complexity, AAA, DNS,
DHCP, XML, or internationalization? If so, describe the review that
No additional review beyond that already done by the Routing Area
Directorate is needed.
(6) Describe any specific concerns or issues that the Document Shepherd
has with this document that the Responsible Area Director and/or the
IESG should be aware of? For example, perhaps he or she is uncomfortable
with certain parts of the document, or has concerns whether there really
is a need for it. In any event, if the WG has discussed those issues and
has indicated that it still wishes to advance the document, detail those
The Document Shepherd has no concerns in this respect.
(7) Has each author confirmed that any and all appropriate IPR
disclosures required for full conformance with the provisions of BCP 78
and BCP 79 have already been filed. If not, explain why.
Each author has indicated that they are not aware of any relevant IPR.
(8) Has an IPR disclosure been filed that references this document?
If so, summarize any WG discussion and conclusion regarding the IPR
No IPR disclosure has been filed that references this document.
(9) How solid is the WG consensus behind this document? Does it
represent the strong concurrence of a few individuals, with others
being silent, or does the WG as a whole understand and agree with it?
The final version of the document has strong consensus from the WG.
(10) Has anyone threatened an appeal or otherwise indicated extreme
discontent? If so, please summarise the areas of conflict in separate
email messages to the Responsible Area Director. (It should be in a
separate email because this questionnaire is publicly available.)
(11) Identify any ID nits the Document Shepherd has found in this
document. (See https://www.ietf.org/tools/idnits/ and the Internet-Drafts
Checklist). Boilerplate checks are not enough; this check needs to be
The following two warnings should be addresed in a future revision.
== The document doesn't use any RFC 2119 keywords, yet seems to have RFC
2119 boilerplate text.
== Outdated reference: draft-ietf-rtgwg-uloop-delay has been published as
(12) Describe how the document meets any required formal review
criteria, such as the MIB Doctor, media type, and URI type reviews.
No additional formal reviews are required based on the document content.
(13) Have all references within this document been identified as
either normative or informative?
All references have been identified as normative or informative.
There are currently 4 normative references. Since this is
an informational document, it might make sense to classify some
or all of those references as in informative.
(14) Are there normative references to documents that are not ready for
advancement or are otherwise in an unclear state? If such normative
references exist, what is the plan for their completion?
There are no normative references in an unclear state.
(15) Are there downward normative references references (see RFC 3967)?
If so, list these downward references to support the Area Director in
the Last Call procedure.
There are no downward normative references.
(16) Will publication of this document change the status of any
existing RFCs? Are those RFCs listed on the title page header, listed
in the abstract, and discussed in the introduction? If the RFCs are not
listed in the Abstract and Introduction, explain why, and point to the
part of the document where the relationship of this document to the
other RFCs is discussed. If this information is not in the document,
explain why the WG considers it unnecessary.
The publication of this document will not change the status of any
(17) Describe the Document Shepherd's review of the IANA considerations
section, especially with regard to its consistency with the body of the
document. Confirm that all protocol extensions that the document makes
are associated with the appropriate reservations in IANA registries.
Confirm that any referenced IANA registries have been clearly
identified. Confirm that newly created IANA registries include a
detailed specification of the initial contents for the registry, that
allocations procedures for future registrations are defined, and a
reasonable name for the new registry has been suggested (see RFC 5226).
There are no IANA considerations.
(18) List any new IANA registries that require Expert Review for future
allocations. Provide any public guidance that the IESG would find
useful in selecting the IANA Experts for these new registries.
There are no new IANA registries.
(19) Describe reviews and automated checks performed by the Document
Shepherd to validate sections of the document written in a formal
language, such as XML code, BNF rules, MIB definitions, etc.
No sections of the document are written in a formal language.