Shepherd writeup
draft-ietf-idr-rfc5575bis-17

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 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?

Proposed Standard.
It defines protocol extensions and procedures for BGP flowspec.
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

   This document defines a Border Gateway Protocol Network Layer
   Reachability Information (BGP NLRI) encoding format that can be used
   to distribute traffic Flow Specifications.  This allows the routing
   system to propagate information regarding more specific components of
   the traffic aggregate defined by an IP destination prefix.

   It specifies IPv4 traffic Flow Specifications via a BGP NLRI which
   carries traffic Flow Specification filter, and an Extended community
   value which encodes actions a routing system can take if the packet
   matches the traffic flow filters.  The flow filters and the actions
   are processed in a fixed order.  Other drafts specify IPv6, MPLS
   addresses, L2VPN addresses, and NV03 encapsulation of IP addresses.

   This document obsoletes RFC5575 and RFC7674 to correct unclear
   specifications in the flow filters and to provide rules for actions
   which interfere (e.g. redirection of traffic and flow filtering).

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 draft clarifies the unclear specifications in RFC5575 and provide the clear rules for actions which interfere with each other. There were questions/discussion about the precedence order and combination of numeric operators, which have been resolved. There were also some discussions about the validation of flowspec components, which has been resolved as well. Recent discussion is about whether and how existing implementations are complied with the suggested behavior in this -bis document. There were several options under consideration, and consensus was reached on the option chosen in the current version .

After WGLC had completed and shortly after the document was submitted for publication, an implementor brought forward a remaining bug in the specification. The chair (John) thought it seriously enough to bring the document back to the WG for further consideration. The bug was fixed and a subsequent WGLC held to cover the change. The relevant mailing list thread is at https://mailarchive.ietf.org/arch/msg/idr/VTuYf23Qzw5Z22EwBt8AFsj-H1g.

Document Quality

  Are there existing implementations of the protocol? 

Implementation report can be found at https://trac.ietf.org/trac/idr/wiki/draft-ietf-rfc5575bis%20implementations

Personnel

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 the 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?

No


(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.

None.


(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.

Robert Raszuk: no IPR
https://mailarchive.ietf.org/arch/msg/idr/YVhw3HWx5eGLkdr3VVhLUSB3LNU

Danny McPherson: no IPR
https://mailarchive.ietf.org/arch/msg/idr/fXrk2lOLkpBUEjhKPqncDoJvSkI3

Christoph Loibl: no IPR
https://mailarchive.ietf.org/arch/msg/idr/hDB-43QPMuUAjmPvgQCMGKQ4uXg

Martin Bacher: no IPR
https://mailarchive.ietf.org/arch/msg/idr/kXELcKcnqRTYGXvz3L4iS5x80L8

Susan Hares: no IPR
https://mailarchive.ietf.org/arch/msg/idr/7q0m8Ggj9uFYXmK60dvT6z2Nkl0

(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.) 

None.

(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
thorough.

According to the ID nits check, there is one warning and several comments, which could be OK:
https://www.ietf.org/tools/idnits?url=https://www.ietf.org/archive/id/draft-ietf-idr-rfc5575bis-13.txt


(12) Describe how the document meets any required formal review
criteria, such as the MIB 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?

All references have been identified as either normative or 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?

No

(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. 

None.

(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.

RFC 5575 and RFC 7674 will be obsoleted by this document. 

They are listed on the title page header, and in the abstract.

(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).

IANA has allocated the SAFI values 133, 134 for RFC5575, the reference needs to be updated to this document.

IANA has created and maintains a registry entitled "Flow Spec Component Types" for RFC5575, the reference needs to be updated to this document. 

IANA has allocated the following code points from the "BGP Transitive Extended Community Types" registry for RFC 7674, the reference needs to be updated to this document. 
0x81  Generic Transitive Experimental Use Extended Community Part 2
0x82  Generic Transitive Experimental Use Extended Community Part 3

IANA has allocated the following code points from the “Generic Transitive Experimental Use Extended Community Sub-Types” registry for RFC 5575, the reference of these code points needs to be updated to this document. 
0x06  Flow spec traffic-rate-bytes
0x07  Flow spec traffic-action (Use of the "Value" field is defined in the "Traffic Action Fields" registry) 
0x08  Flow spec redirect AS-2byte format
0x09  Flow spec traffic-remarking   

IANA is requested to allocate a new code point for “Flow spec traffic-rate-packets” from the “Generic Transitive Experimental Use Extended Community Sub-Types” registry.

IANA has created and maintains the registry entitled “Generic Transitive Experimental Use Extended Community Part 2 Sub-Types” for RFC7674, the reference needs to be updated to this document.

IANA has created and maintains the registry entitled “Generic Transitive Experimental Use Extended Community Part 3 Sub-Types” for RFC7674, the reference needs to be updated to this document.

IANA has created and maintains a registry entitled "Traffic Action Fields" for RFC 5575, the reference needs to be updated to this document. 

(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.

None.

(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 review of automated checks required.
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