Carrying SR-Algorithm in Path Computation Element Communication Protocol (PCEP)
draft-ietf-pce-sid-algo-29

Approval announcement
Draft of message to be sent after approval:

Announcement

From: The IESG <iesg-secretary@ietf.org>
To: IETF-Announce <ietf-announce@ietf.org>
Cc: The IESG <iesg@ietf.org>, dd@dhruvdhody.com, draft-ietf-pce-sid-algo@ietf.org, ketant.ietf@gmail.com, pce-chairs@ietf.org, pce@ietf.org, rfc-editor@rfc-editor.org
Subject: Protocol Action: 'Carrying SR-Algorithm in Path Computation Element Communication Protocol (PCEP)' to Proposed Standard (draft-ietf-pce-sid-algo-29.txt)

The IESG has approved the following document:
- 'Carrying SR-Algorithm in Path Computation Element Communication
   Protocol (PCEP)'
  (draft-ietf-pce-sid-algo-29.txt) as Proposed Standard

This document is the product of the Path Computation Element Working Group.

The IESG contact persons are Gunter Van de Velde, Jim Guichard and Ketan
Talaulikar.

A URL of this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-pce-sid-algo/

Ballot Text

Technical Summary

   This document specifies extensions to the Path Computation Element
   Communication Protocol (PCEP) to enhance support for Segment Routing
   (SR) with a focus on the use of Segment Identifiers (SIDs) and SR-
   Algorithms in Traffic Engineering (TE).  The SR-Algorithm associated
   with a SID defines the path computation algorithm used by Interior
   Gateway Protocols (IGPs).  This document introduces extensions in
   three main areas.

   Mechanisms for informing PCEP peers about the SR-Algorithm associated
   with SIDs by encoding this information in Explicit Route Object (ERO)
   and Record Route Object (RRO) subobjects.  This document updates RFC
   8664 and RFC 9603 to allow such extension.

   The document specifies SR-Algorithm constraint, enabling refined path
   computations that can leverage IGP algorithm logic, including
   Flexible Algorithms, and their associated constraints and
   optimization metrics.

   It defines new metric types for the METRIC object required to support
   SR-Algorithm based path computation, but also applicable to Label
   Switched Paths (LSPs) setup using different Path Setup Types.

Working Group Summary

   There was broad consensus on this document and no controversies.
   The concept of "Subobject Extension Block' was introduced in the
   document late in the process, but these changes were presented to
   the WG and discussed on the mailing list to reconfirm consensus.

Document Quality

   The document is of good quality and involved active contributions
   and reviews by implementers. There are at least two known
   implementations as captured in the document. There was cross-review
   from LSR WG participants on aspects related to the Flexible
   Algorithm that this work leverages. The document has also 
   received reviews from the RTG, OPS, and SEC directorates. Document
   does not contain, YANG, MIB, media types, etc. to warrant those
   reviews.   

Personnel

   The Document Shepherd for this document is Dhruv Dhody. The Responsible
   Area Director is Ketan Talaulikar.

RFC Editor Note