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Shepherd writeup

As required by RFC 4858, this is the current template for the Document
Shepherd Write-Up. Changes are expected over time.

This version is dated 1 November 2019.

(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?

Proposed Standard.
It defines protocol extensions and procedures for applying BGP flowspec to IPv6
packets. Yes the type is 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:

Technical Summary:

   Dissemination of Flow Specification Rules [I-D.ietf-idr-rfc5575bis]
   provides a protocol extension for propagation of traffic flow
   information for the purpose of rate limiting or filtering.  The
   [I-D.ietf-idr-rfc5575bis] specifies those extensions for IPv4
   protocol data packets only.

   This specification extends [I-D.ietf-idr-rfc5575bis] and defines
   changes to the original document in order to make it also usable and
   applicable to IPv6 data packets.

Working Group Summary:

Was there anything in WG process that is worth noting? For example, was there
controversy about particular points or were there decisions where the consensus
was particularly rough?

This document goes relatively smoothly in the WG. There was discussion about
whether this draft should merge with another draft (5575bis) which is a
revision of flowspec for IPv4. The WG has decided to move forward with 2
separate drafts (V4 and V6 respectively) at current stage.

Document Quality:

Are there existing implementations of the protocol? Have a significant number
of vendors indicated their plan to implement the specification? Are there any
reviewers that merit special mention as having done a thorough review, e.g.,
one that resulted in important changes or a conclusion that the document had no
substantive issues? If there was a MIB Doctor, YANG Doctor, Media Type or other
expert review, what was its course (briefly)? In the case of a Media Type
review, on what date was the request posted?

Implementation report:

The features defined in this draft has been implemented by more than 2 vendors
and one open source.


Who is the Document Shepherd? Who is the Responsible Area Director?

Document Shepherd: Jie Dong
Responsible Area Director: Alvaro Retana

(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 IESG.

The document shepherd performed the review on:
1) Nits
2) Technical review
3) Implementation report
4) IPR check

The document shepherd think after the nits are resolved, this document is ready
for publication.

(4) Does the document Shepherd have any concerns about the depth or breadth of
the reviews that have been performed?


(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 took place.

Nothing beyond the normal checks.

(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 concerns here.


(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?


Susan Hares: no IPR

Robert Raszuk: no IPR

Christoph Loibl: no IPR

(8) Has an IPR disclosure been filed that references this document? If so,
summarize any WG discussion and conclusion regarding the IPR disclosures.

No IPR Disclosure.

(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?

Solid consensus according to the review and discussion on the list.

(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 and the Internet-Drafts Checklist).
Boilerplate checks are not enough; this check needs to be thorough.

According to the ID nits check, there is 1 error, 6 warnings and 2 comments.
The authors needs to resolve the ID nits:

(12) Describe how the document meets any required formal review criteria, such
as the MIB Doctor, YANG Doctor, media type, and URI type reviews.

Not relevant for MIB Doctor, Media type, or URI.

(13) Have all references within this document been identified as either
normative or informative?

In addition to the normative and informative references, it also has one
reference subsection which contains a URI.

(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?


(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


(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.

None of existing RFCs status will be changed by this document.

In both abstraction and introduction, it is mentioned that this is an extension
to RFC5575bis, while it is considered RFC5575bis will not be updated by this

(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 8126).

The IANA section is consistent with the body of the document. A detailed
specification of the initial contents for the registry is provided, while that
allocations procedures for future registrations are not defined yet.

IANA is requested to create and maintain a new registry entitled:
   "Flow Spec IPv6 Component Types" containing the initial entries as specified
   in Table 1 of this document.

           | Value | Name                    | Reference       |
           | 1     | Destination IPv6 Prefix | [this document] |
           | 2     | Source IPv6 Prefix      | [this document] |
           | 3     | Next Header             | [this document] |
           | 4     | Port                    | [this document] |
           | 5     | Destination port        | [this document] |
           | 6     | Source port             | [this document] |
           | 7     | ICMPv6 type             | [this document] |
           | 8     | ICMPv6 code             | [this document] |
           | 9     | TCP flags               | [this document] |
           | 10    | Packet length           | [this document] |
           | 11    | DSCP                    | [this document] |
           | 12    | Fragment                | [this document] |
           | 13    | Flow Label              | [this document] |

             Table 1: Registry: Flow Spec IPv6 Component Types

IANA maintains a registry entitled "Generic Transitive Experimental
   Use Extended Community Sub-Types".  For the purpose of this work,
   IANA is requested to assign a new value:

   | Sub-Type   | Name                                   | Reference   |
   | Value      |                                        |             |
   | TBD        |             Flow spec rt-redirect-ipv6 | [this       |
   |            | format                                 | document]   |

      Table 2: Registry: Generic Transitive Experimental Use Extended
                            Community Sub-Types

(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.

This document defines a new registry, while the allocation procedure is not
provided yet.

(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, YANG modules, etc.

No review or automated checks required.

(20) If the document contains a YANG module, has the module been checked with
any of the recommended validation tools
( for syntax and
formatting validation? If there are any resulting errors or warnings, what is
the justification for not fixing them at this time? Does the YANG module comply
with the Network Management Datastore Architecture (NMDA) as specified in

No YANG module defined in this document.