Entropy labels for source routed stacked tunnels
draft-kini-mpls-spring-entropy-label-02

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Document Type Active Internet-Draft (mpls WG)
Last updated 2014-10-27
Replaced by draft-ietf-mpls-spring-entropy-label
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Network Working Group                                       S. Kini, Ed.
Internet-Draft                                                  Ericsson
Intended status: Informational                               K. Kompella
Expires: April 28, 2015                                          Juniper
                                                            S. Sivabalan
                                                                   Cisco
                                                            S. Litkowski
                                                                  Orange
                                                               R. Shakir
                                                                    B.T.
                                                                   X. Xu
                                                                  Huawei
                                                            W. Hendrickx
                                                          Alcatel-Lucent
                                                             J. Tantsura
                                                                Ericsson
                                                        October 25, 2014

            Entropy labels for source routed stacked tunnels
                draft-kini-mpls-spring-entropy-label-02

Abstract

   Source routed tunnel stacking is a technique that can be leveraged to
   provide a method to steer a packet through a controlled set of
   segments.  This 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 source routed stacked tunnels.

Status of This Memo

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   This Internet-Draft will expire on April 28, 2015.

Kini, et al.             Expires April 28, 2015                 [Page 1]
Internet-Draft    EL for source routed stacked tunnels      October 2014

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Abbreviations and Terminology . . . . . . . . . . . . . . . .   3
   3.  Use-case for multipath load balancing in source stacked
       tunnels . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Recommended EL solution for SPRING  . . . . . . . . . . . . .   5
   5.  Options considered  . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Single EL at the bottom of the stack of tunnels . . . . .   6
     5.2.  An EL per tunnel in the stack . . . . . . . . . . . . . .   7
     5.3.  A re-usable EL for a stack of tunnels . . . . . . . . . .   8
       5.3.1.  EL at top of stack  . . . . . . . . . . . . . . . . .   8
     5.4.  ELs at readable label stack depths  . . . . . . . . . . .   8
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   The source routed stacked tunnels paradigm is leveraged by techniques
   such as Segment Routing (SR) [I-D.filsfils-spring-segment-routing] to
   steer a packet through a set of segments.  This can be directly
   applied to the MPLS data plane, but it has implications on label
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