Entropy labels for source routed tunnels with label stacks
draft-ietf-mpls-spring-entropy-label-02

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Document Type Active Internet-Draft (mpls WG)
Last updated 2016-01-27
Replaces draft-kini-mpls-spring-entropy-label
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Network Working Group                                       S. Kini, Ed.
Internet-Draft                                                  Ericsson
Intended status: Standards Track                             K. Kompella
Expires: July 29, 2016                                           Juniper
                                                            S. Sivabalan
                                                                   Cisco
                                                            S. Litkowski
                                                                  Orange
                                                               R. Shakir

                                                                   X. Xu
                                                                  Huawei
                                                            W. Hendrickx
                                                          Alcatel-Lucent
                                                             J. Tantsura
                                                                Ericsson
                                                        January 26, 2016

       Entropy labels for source routed tunnels with label stacks
                draft-ietf-mpls-spring-entropy-label-02

Abstract

   Source routed tunnels with label 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 tunnels with
   label stacks.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on July 29, 2016.

Kini, et al.              Expires July 29, 2016                 [Page 1]
Internet-DraftEL - source routed tunnels with label stacks  January 2016

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Abbreviations and Terminology . . . . . . . . . . . . . . . .   3
   3.  Use-case requiring multipath load balancing . . . . . . . . .   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  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   The source routed tunnels with label stacking paradigm is leveraged
   by techniques such as Segment Routing (SR)
   [I-D.ietf-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 the label stack depth.

   Clarifying statements on label stack depth have been provided in
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