Use of BIER Entropy for Data Center CLOS Networks
draft-ietf-bier-entropy-staged-dc-clos-00

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Network Working Group                                             J. Xie
Internet-Draft                                       Huawei Technologies
Intended status: Informational                                     X. Xu
Expires: April 25, 2019                                     Alibaba Inc.
                                                                  G. Yan
                                                              M. McBride
                                                     Huawei Technologies
                                                        October 22, 2018

           Use of BIER Entropy for Data Center CLOS Networks
               draft-ietf-bier-entropy-staged-dc-clos-00

Abstract

   Bit Index Explicit Replication (BIER) introduces a new multicast-
   specific BIER Header.  BIER can be applied to the Multi Protocol
   Label Switching (MPLS) data plane or Non-MPLS data plane.  Entropy is
   a technique used in BIER to support load-balancing.  This document
   examines and describes how BIER Entropy is to be applied to Data
   Center CLOS networks for path selection.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

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 April 25, 2019.

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Internet-Draft  Use of BIER Entropy for DC CLOS Networks    October 2018

Copyright Notice

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

   This document is subject to BCP 78 and the IETF Trust's Legal
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   publication of this document.  Please review these documents
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Problem Statement and Considerations  . . . . . . . . . . . .   3
     3.1.  Problem Statement . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Considerations  . . . . . . . . . . . . . . . . . . . . .   4
   4.  Use of BIER Entropy for DC CLOS Network . . . . . . . . . . .   5
     4.1.  Use of BIER Entropy for DC CLOS Network . . . . . . . . .   5
     4.2.  Steering for elephant flows . . . . . . . . . . . . . . .   6
     4.3.  Path Division for Tenant flows to different SIs . . . . .   6
     4.4.  Link Failure and Convergence  . . . . . . . . . . . . . .   6
   5.  Data-Plane Processing . . . . . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Bit Index Explicit Replication (BIER) [RFC8279] is an architecture
   that provides optimal multicast forwarding without requiring
   intermediate routers to maintain any per-flow state by using a
   multicast-specific BIER header.  [RFC8296] defines two types of BIER
   encapsulation formats: one is MPLS encapsulation, the other is non-
   MPLS encapsulation.  Entropy is a technique used in BIER to support
   load-balancing.  This document examines and describes how BIER
   Entropy is to be applied to Data Center CLOS networks for path
   selection.

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Internet-Draft  Use of BIER Entropy for DC CLOS Networks    October 2018

2.  Terminology

   Readers of this document are assumed to be familiar with the
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