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PCE workgroup                                                 Fangwei Hu
Internet-Draft                                                Quan Xiong
Intended status: Standards Track                             Greg Mirsky
Expires: June 13, 2019                                   ZTE Corporation
                                                          Weiqiang Cheng
                                                            China Mobile
                                                            Dec 10, 2018


                       Stitching LSP Association
             draft-hu-pce-stitching-lsp-association-00.txt

Abstract

   This document defines the stitching LSP association type and
   stitching LSP association TLV for the inter-domain Segment Routing
   MPLS-TP network.

Status of This Memo

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   This Internet-Draft will expire on June 13, 2019.

Copyright Notice

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

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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.  Conventions used in this document . . . . . . . . . . . . . .   2
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   2
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   3.  Operation Overview  . . . . . . . . . . . . . . . . . . . . .   3
   4.  Stitching LSP Association Group . . . . . . . . . . . . . . .   3
     4.1.  Stitching LSP Association Object  . . . . . . . . . . . .   3
     4.2.  Stitching TLV format  . . . . . . . . . . . . . . . . . .   3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
     7.1.  Association Types . . . . . . . . . . . . . . . . . . . .   4
     7.2.  Stitching Association TLV . . . . . . . . . . . . . . . .   4
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   [I-D.hu-mpls-sr-inter-domain-use-cases] provides stitching path label
   to indicate the the packet from the border nodes to forward to
   another AS domain.  The border nodes should install the following
   MPLS data entries:

     incomging label: Stiching Path Label
        outgoing label: the SID list of the next AS domain + next Stitching Path label

   [I-D.xiong-pce-stateful-pce-sr-inter-domain] introduces the procedure
   and the PCEP extension to form the inter-domain MPLS-TP MPLS data
   entries.  This document proposes the related LSP association group
   extension.

2.  Conventions used in this document

2.1.  Terminology

2.2.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.




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3.  Operation Overview

   [I-D.ietf-pce-association-group] introduces a generic mechanism to
   create a grouping of LSPs.  This grouping can then be used to define
   associations between sets of LSPs or between a set of LSPs and a set
   of attributes.  This document proposes a new optional association
   object type called "stitching Association LSP type" and the related
   TLV called "stitching association LSP TLV" to form the inter-domain
   MPLS forwarding entry for the border nodes.

   As defined in [I-D.ietf-pce-association-group], stitching LSP
   Association could be created dynamically or configured by the
   operator when operator-configured association is needed.

4.  Stitching LSP Association Group

4.1.  Stitching LSP Association Object

   A new Association Type for the Association Object is defined in this
   document,

      Association Type (TBD) = Stitching Path Segment LSP Association
      Group.

   The Association Types is operator-configured associations in nature
   and statically created by the operator on the PCEP peers.  The LSP
   belonging to these associations is conveyed via PCEP messages to the
   PCEP peer.  Operator-configured Association Range TLV
   [I-D.ietf-pce-association-group] MUST NOT be sent for this
   Association Type, and MUST be ignored, so that the entire range of
   association ID can be used for it.

   The Association ID, Association Source, optional Global Association
   Source and optional Extended Association ID in the Stitching Path
   Segment LSP Association Group Object are initialized using the
   procedures defined in [I-D.ietf-pce-association-group] and [RFC7551].

4.2.  Stitching TLV format

   The format of the Stitching LSP Association Group TLV is shown in
   Figure 1.










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       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |             Type              |             Length            |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                             Reserved                          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

               Figure 1: Stitching LSP Association Group TLV

   The fields of the Stitching LSP Association Group TLV are following:

      Type:16bits, it indicates the stitching LSP Association Group
      TLV(TBD2, the value is assigned by IANA).

      Length: the value is 4, it indicates the length of the TLV is 4
      bytes.

      Reserved: it is reserved for future use.

5.  Security Considerations

6.  Acknowledgements

7.  IANA Considerations

7.1.  Association Types

   IANA is requested to make the assignment of values for the sub-
   registry "ASSOCIATION Type Field" as follows:

                       +--------+------------------+
                       | Value  |    Reference     |
                       +--------+------------------+
                       |  TBD1  | [this document]  |
                       +--------+------------------+

                                  Table 1

7.2.  Stitching Association TLV

   This document defines a new TLV for carrying additional information
   of LSPs within a Stitching LSP Association Group.  IANA is requested
   to add the assignment of a new value in the existing "PCEP TLV Type
   Indicators" registry as follows:






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    +-------+-------------------------------------+------------------+
    |  Type |             Description             |    Reference     |
    +-------+-------------------------------------+------------------+
    |  TBD2 | Stitching LSP Association Group TLV | [this document]  |
    +-------+-------------------------------------+------------------+

                                  Table 2

8.  Normative References

   [I-D.cheng-spring-mpls-path-segment]
              Cheng, W., Wang, L., Li, H., Chen, M., Gandhi, R., Zigler,
              R., and S. Zhan, "Path Segment in MPLS Based Segment
              Routing Network", draft-cheng-spring-mpls-path-segment-03
              (work in progress), October 2018.

   [I-D.hu-mpls-sr-inter-domain-use-cases]
              hu, f., Xiong, Q., Mirsky, G., and W. Cheng, "Segment
              Routing in MPLS-TP Inter-domain Use Cases", draft-hu-mpls-
              sr-inter-domain-use-cases-00 (work in progress), December
              2018.

   [I-D.ietf-pce-association-group]
              Minei, I., Crabbe, E., Sivabalan, S., Ananthakrishnan, H.,
              Dhody, D., and Y. Tanaka, "PCEP Extensions for
              Establishing Relationships Between Sets of LSPs", draft-
              ietf-pce-association-group-06 (work in progress), June
              2018.

   [I-D.xiong-pce-stateful-pce-sr-inter-domain]
              Xiong, Q., hu, f., Mirsky, G., and W. Cheng, "Stateful PCE
              for SR-MPLS-TP Inter-domain", draft-xiong-pce-stateful-
              pce-sr-inter-domain-00 (work in progress), December 2018.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC7551]  Zhang, F., Ed., Jing, R., and R. Gandhi, Ed., "RSVP-TE
              Extensions for Associated Bidirectional Label Switched
              Paths (LSPs)", RFC 7551, DOI 10.17487/RFC7551, May 2015,
              <https://www.rfc-editor.org/info/rfc7551>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.




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Authors' Addresses

   Fangwei Hu
   ZTE Corporation
   No.889 Bibo Rd
   Shanghai  201203
   China

   Phone: +86 21 68896273
   Email: hu.fangwei@zte.com.cn


   Quan Xiong
   ZTE Corporation
   No.6 Huashi Park Rd
   Wuhan, Hubei  430223
   China

   Phone: +86 27 83531060
   Email: xiong.quan@zte.com.cn


   Greg Mirsky
   ZTE Corporation
   USA

   Email: gregimirsky@gmail.com


   Weiqiang Cheng
   China Mobile
   Beijing
   China

   Email: chengweiqiang@chinamobile.com
















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