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Early Review of draft-ietf-idr-bgp-ls-flex-algo-05

Request Review of draft-ietf-idr-bgp-ls-flex-algo
Requested revision No specific revision (document currently at 12)
Type Early Review
Team Routing Area Directorate (rtgdir)
Deadline 2020-11-23
Requested 2020-11-01
Requested by Susan Hares
Authors Ketan Talaulikar , Peter Psenak , Shawn Zandi , Gaurav Dawra
I-D last updated 2020-11-16
Completed reviews Rtgdir Early review of -05 by Andrew G. Malis (diff)
Rtgdir Last Call review of -09 by Donald E. Eastlake 3rd (diff)
Genart Last Call review of -09 by Vijay K. Gurbani (diff)
The draft is going through WG LC from 11/1 to 11/16.
Assignment Reviewer Andrew G. Malis
State Completed
Review review-ietf-idr-bgp-ls-flex-algo-05-rtgdir-early-malis-2020-11-16
Posted at
Reviewed revision 05 (document currently at 12)
Result Has Issues
Completed 2020-11-16

I have been selected as the Routing Directorate reviewer for this draft.
The Routing Directorate seeks to review all routing or routing-related
drafts as they pass through IETF last call and IESG review, and sometimes
on special request (in this case, WG last call). The purpose of the review
is to provide assistance to the Routing ADs. For more information about the
Routing Directorate, please see

Although these comments are primarily for the use of the Routing ADs, it
would be helpful if you could consider them along with any other WG Last
Call comments that you receive, and strive to resolve them through
discussion or by updating the draft.

Document: draft-ietf-idr-bgp-ls-flex-algo-05.txt
Reviewer: Andy Malis
Review Date: Nov. 16, 2020
WG LC End Date: Nov. 23, 2020
Intended Status: Standards Track


I have some minor concerns about this document that I think should be
resolved before publication.

Overall, the draft is straightforward and easy to follow. In particular, I
appreciated the summary of draft-ietf-lsr-flex-algo as a part of the

Once the comments below have been addressed, it should be ready to be
forwarded to the IESG for approval.

Major Issues:

No major issues found.

Minor Issues:

While at least one early implementation has been publicly disclosed, an
early IANA allocation is required for the Flex Algorithm Exclude SRLG TLV
so that early implementations can interoperate.

It would also be helpful for the reader if Section 5 (IANA Considerations)
contained the URL reference to the IANA "BGP-LS Node Descriptor, Link
Descriptor, Prefix Descriptor, and Attribute TLVs" registry at


idnits ran clean except for two out-of-date references.

There are some English language nits with the text, such as "distribute
manner" should be "distributed manner", "This definition provisioned"
should be "This definition is provisioned", "constraint based" should be
"constraint-based", "Flexible Algorithm is called so as it allows" should
be "Flexible Algorithm is so called as it allows", "The operations" should
be "The operation", and so on (and this is just on pages 1-3). I recommend
a language cleanup pass on the draft before forwarding it to the IESG.