Segment routing for SDWAN paths over hybrid networks
draft-dunbar-sr-sdwan-over-hybrid-networks-06

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Network Working Group                                         L. Dunbar
Internet Draft                                                Futurewei
Intended status: Informational                               Mehmet Toy
Expires: May 4, 2020                                            Verizon
                                                       November 4, 2019

            Segment routing for SDWAN paths over hybrid networks
               draft-dunbar-sr-sdwan-over-hybrid-networks-06

Abstract

   This document describes a method for end-to-end (E2E) SDWAN paths to
   traverse specific list of underlay network segments, some of which
   can be private networks which include SR enabled segments, some of
   which  can be the public IP 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 a SDWAN path's head-end selected route traversing
   through a list of specific nodes of multiple network segments
   without requiring the nodes in each network segment to have the
   intelligence (or maintaining states) of selecting next hop or next
   domain.

Status of this Memo

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xxx, et al.                                                    [Page 1]
Internet-Draft        SDWAN over hybrid networks       November 4, 2019

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Table of Contents

   1. Introduction...................................................3
   2. Definition of terms............................................4
   3. Key Use Cases..................................................5
      3.1. SDWAN Path over LTE network and SR Domain.................5
      3.2. SDWAN as Last Mile for Cloud DCs Access...................6
      3.3. How & Why SR is useful for those use cases................7
   4. Mechanism for SDWAN path over one SR Domain and existing access8
      4.1. Controller Delivers SID Stack to SDWAN Head-end...........9
      4.2. Using GRE Key or VXLAN ID to Differentiate Flows.........11
      4.3. Using UDP Source Port Number to Differentiate Flows......12
      4.4. GRE Header Extension.....................................15

Dunbar, et al.                                                 [Page 2]
Internet-Draft        SDWAN over hybrid networks       November 4, 2019

   5. SDWAN path over multiple SP managed domains...................16
      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
      8.1. Normative References.....................................20
      8.2. Informative References...................................20
   9. Acknowledgments...............................................22
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