Segment routing for SD-WAN paths over hybrid networks
draft-dunbar-sr-sdwan-over-hybrid-networks-00

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Network Working Group                                         L. Dunbar
Internet Draft                                                   Huawei
Intended status: Informational                               Mehmet Toy
Expires: January 2019                                           Verizon
                                                           May 31, 2018

           Segment routing for SD-WAN paths over hybrid networks
               draft-dunbar-sr-sdwan-over-hybrid-networks-00

Abstract

   This document describes a method for end-to-end (E2E) SD-WAN paths
   (most likely encrypted) to traverse specific list of network
   segments, some of which may be legacy networks that do not support
   SR, to achieve the desired optimal E2E quality.

   The method described in this draft uses the principle of segment
   routing to enforce the SD-WAN paths' head ends selecting paths
   traversing through a list of specific nodes of multiple network
   segments without requiring the nodes in each network segments to
   have the intelligence (or maintaining states) of selecting next hop
   or next domain. Those networks over which the SD-WAN path traverse
   may have different data planes (some maybe IPv4, others maybe IPv6
   or MPLS) and can be owned & managed by different network service
   providers (SP).

Status of this Memo

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

   This Internet-Draft is submitted in full conformance with the
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   Copyright (c) 2018 IETF Trust and the persons identified as the
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Table of Contents

   1. Introduction...................................................3
   2. Definition of terms............................................4
   3. Key Use Cases..................................................5
      3.1. SD-WAN Path over LTE network and SR Domain................5
      3.2. SD-WAN path over public Internet and SR domain............6
      3.3. How SR is useful for those Use Cases......................7

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   4. Mechanism for SD-WAN path over one SR Domain and public Internet
   ..................................................................8
      4.1. Controller Delivers SID Stack to SD-WAN end-points........9
      4.2. Using GRE Key to Differentiate Flows.....................11
      4.3. Using UDP Source Port Number to Differentiate Flows......12
      4.4. GRE Header Extension.....................................15
   5. SD-WAN path over multiple SP managed domains..................15
      5.1. When Both SP domains support SR..........................17
      5.2. When SP-2 does not support SR............................17
      5.3. When SP-1 and SP-2 don't want to share network information18
      5.4. TLV to pass Metadata through SRv6 Domain.................18
   6. Security Considerations.......................................19
   7. IANA Considerations...........................................20
   8. References....................................................20
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