Entropy label for SPRING tunnels
draft-ietf-mpls-spring-entropy-label-11

Document Type Active Internet-Draft (mpls WG)
Last updated 2018-06-21 (latest revision 2018-05-23)
Replaces draft-kini-mpls-spring-entropy-label
Stream IETF
Intended RFC status Proposed Standard
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Telechat date On agenda of 2018-07-05 IESG telechat
Needs 9 more YES or NO OBJECTION positions to pass.
Responsible AD Deborah Brungard
Send notices to draft-ietf-mpls-spring-entropy-label@ietf.org, mpls@ietf.org, db3546@att.com
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Network Working Group                                            S. Kini
Internet-Draft
Intended status: Standards Track                             K. Kompella
Expires: November 24, 2018                                       Juniper
                                                            S. Sivabalan
                                                                   Cisco
                                                            S. Litkowski
                                                                  Orange
                                                               R. Shakir
                                                                  Google
                                                             J. Tantsura
                                                            May 23, 2018

                    Entropy label for SPRING tunnels
                draft-ietf-mpls-spring-entropy-label-11

Abstract

   Segment Routing (SR) leverages the source routing paradigm.  A node
   steers a packet through an ordered list of instructions, called
   segments.  Segment Routing can be applied to the Multi Protocol Label
   Switching (MPLS) data plane.  Entropy label (EL) is a technique used
   in MPLS to improve load-balancing.  This document examines and
   describes how ELs are to be applied to Segment Routing MPLS.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on November 24, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Kini, et al.            Expires November 24, 2018               [Page 1]
Internet-Draft      Entropy Labels for SPRING tunnels           May 2018

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Abbreviations and Terminology . . . . . . . . . . . . . . . .   4
   3.  Use-case requiring multipath load-balancing . . . . . . . . .   5
   4.  Entropy Readable Label Depth  . . . . . . . . . . . . . . . .   6
   5.  Maximum SID Depth . . . . . . . . . . . . . . . . . . . . . .   7
   6.  LSP stitching using the binding SID . . . . . . . . . . . . .   9
   7.  Insertion of entropy labels for SPRING path . . . . . . . . .  10
     7.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .  10
       7.1.1.  Example 1 where the ingress node has a sufficient MSD  11
       7.1.2.  Example 2 where the ingress node has not a sufficient
               MSD . . . . . . . . . . . . . . . . . . . . . . . . .  12
     7.2.  Considerations for the placement of entropy labels  . . .  13
       7.2.1.  ERLD value  . . . . . . . . . . . . . . . . . . . . .  14
       7.2.2.  Segment type  . . . . . . . . . . . . . . . . . . . .  14
         7.2.2.1.  Node-SID  . . . . . . . . . . . . . . . . . . . .  15
         7.2.2.2.  Adjacency-set SID . . . . . . . . . . . . . . . .  15
         7.2.2.3.  Adjacency-SID representing a single IP link . . .  15
         7.2.2.4.  Adjacency-SID representing a single link within a
                   L2 bundle . . . . . . . . . . . . . . . . . . . .  16
         7.2.2.5.  Adjacency-SID representing a L2 bundle  . . . . .  16
       7.2.3.  Maximizing number of LSRs that will load-balance  . .  16
       7.2.4.  Preference for a part of the path . . . . . . . . . .  16
       7.2.5.  Combining criteria  . . . . . . . . . . . . . . . . .  17
   8.  A simple example algorithm  . . . . . . . . . . . . . . . . .  17
   9.  Deployment Considerations . . . . . . . . . . . . . . . . . .  18
   10. Options considered  . . . . . . . . . . . . . . . . . . . . .  18
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