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DetNet                                                     B. Varga, Ed.
Internet-Draft                                                 J. Farkas
Intended status: Standards Track                                Ericsson
Expires: November 6, 2019                                      L. Berger
                                                 LabN Consulting, L.L.C.
                                                                A. Malis
                                                               S. Bryant
                                                     Huawei Technologies
                                                             J. Korhonen
                                                             May 5, 2019


                    DetNet Data Plane: MPLS over IP
                 draft-ietf-detnet-mpls-over-udp-ip-00

Abstract

   This document specifies the MPLS Deterministic Networking data plane
   operation and encapsulation over an IP network.  The approach is
   modeled on the operation of MPLS and PseudoWires (PW) over IP.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 6, 2019.

Copyright Notice

   Copyright (c) 2019 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect



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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   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
     2.1.  Terms Used in This Document . . . . . . . . . . . . . . .   3
     2.2.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Requirements Language . . . . . . . . . . . . . . . . . . . .   4
   4.  DetNet MPLS Operation over DetNet
       IP PSNs . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   6
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Deterministic Networking (DetNet) is a service that can be offered by
   a network to DetNet flows.  DetNet provides these flows with a low
   packet loss rates and assured maximum end-to-end delivery latency.
   General background and concepts of DetNet can be found in
   [I-D.ietf-detnet-architecture].

   The DetNet Architecture decomposes the DetNet related data plane
   functions into two sub-layers: a service sub-layer and a forwarding
   sub-layer.  The service sub-layer is used to provide DetNet service
   protection and reordering.  The forwarding sub-layer is used to
   provides congestion protection (low loss, assured latency, and
   limited reordering) leveraging MPLS Traffic Engineering mechanisms.

   This document specifies use of the MPLS DetNet encapsulation over an
   IP network.  The approach is modeled on the operation of MPLS and
   PseudoWires (PW) over an IP Packet Switched Network (PSN)
   [RFC3985][RFC4385][RFC7510].  It maps the MPLS data plane
   encapsulation described in [I-D.ietf-detnet-mpls] to the DetNet IP
   data plane defined in [I-D.ietf-detnet-ip].

   To carry DetNet with full functionality at the DetNet layer over an
   IP network, the following components are required (these are a subset




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   of the requirements for MPLS encapsulation listed in
   [I-D.ietf-detnet-mpls]):

   1.  A method of identifying the DetNet flow group to the processing
       element.

   2.  A method of carrying the DetNet sequence number.

   3.  A method of distinguishing DetNet OAM packets from DetNet data
       packets.

   4.  A method of carrying queuing and forwarding indication.

   These requirements are satisfied by the DetNet over MPLS
   Encapsulation described in [I-D.ietf-detnet-mpls].

2.  Terminology

2.1.  Terms Used in This Document

   This document uses the terminology established in the DetNet
   architecture [I-D.ietf-detnet-architecture], and the reader is
   assumed to be familiar with that document and its terminology.

2.2.  Abbreviations

   The following abbreviations are used in this document:

   CW            Control Word.

   d-CW          A DetNet Control Word (d-CW) is used for sequencing and
                 identifying duplicate packets of a DetNet flow at the
                 DetNet service sub-layer.

   DetNet        Deterministic Networking.

   F-Label       A Detnet "forwarding" label that identifies the LSP
                 used to forward a DetNet flow across an MPLS PSN, e.g.,
                 a hop-by-hop label used between label switching routers
                 (LSR).

   LSR           Label Switching Router.

   MPLS          Multiprotocol Label Switching.

   OAM           Operations, Administration, and Maintenance.

   PEF           Packet Elimination Function.



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   PRF           Packet Replication Function.

   PREOF         Packet Replication, Elimination and Ordering Functions.

   POF           Packet Ordering Function.

   PSN           Packet Switched Network.

   PW            PseudoWire.

   S-Label       A DetNet "service" label that is used between DetNet
                 nodes that implement also the DetNet service sub-layer
                 functions.  An S-Label is also used to identify a
                 DetNet flow at DetNet service sub-layer.

3.  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.

4.  DetNet MPLS Operation over DetNet IP PSNs

   This document builds on the specification of MPLS over UDP and IP
   defined in [RFC7510].  It replaces the F-Label(s) used in
   [I-D.ietf-detnet-mpls] with UDP and IP headers.  The UDP and IP
   header information is used to identify DetNet flows, including member
   flows, per [I-D.ietf-detnet-ip].  The resulting encapsulation is
   shown in Figure 1.

   Note that this encapsulation works equally well with IPv4, IPv6, and
   IPv6-based Segment Routing [I-D.ietf-6man-segment-routing-header].

















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      +---------------------------------+
      |                                 |
      |         DetNet App-Flow         |
      |         Payload  Packet         |
      |                                 |
      +---------------------------------+ <--\
      |       DetNet Control Word       |    |
      +---------------------------------+    +--> DetNet data plane
      |             S-Label             |    |    MPLS encapsulation
      +---------------------------------+ <--+
      |           UDP Header            |    |
      +---------------------------------+    +--> DetNet data plane
      |           IP Header             |    |    IP encapsulation
      +---------------------------------+ <--/
      |           Data-Link             |
      +---------------------------------+
      |           Physical              |
      +---------------------------------+


                 Figure 1: IP Encapsulation of DetNet MPLS

   d-CW and and S-Labels are used as defined in [I-D.ietf-detnet-mpls]
   and are not modified by this document.

   To support outgoing DetNet MPLS over IP, an implementation MUST
   support the provisioning of IP/UDP header information in place of
   sets of F-Labels.  Note that multiple sets of F-Labels can be
   provisioned to support PRF on transmitted DetNet flows and therefore,
   when PRF is supported, multiple IP/UDP headers MAY be provisioned.
   When multiple IP/UDP headers are provisioned for a particular
   outgoing app-flow, a copy of the outgoing packet, including the
   pushed S-Label, MUST be made for each.  The headers for each outgoing
   packet MUST be based on the configuration information and as defined
   in [RFC7510], with one exception.  The one exception is that the UDP
   Source Port value MUST be set to uniquely identify the DetNet
   (forwarding sub-layer) flow.  The packet MUST then be handed as a
   DetNet IP packet, per [I-D.ietf-detnet-ip].

   To support receive processing an implementation MUST also support the
   provisioning of received IP/UDP header information.  When S-Labels
   are taken from platform label space, all that is required is to
   provision that receiving IP/UDP encapsulated DetNet MPLS packets is
   permitted.  Once the IP/UDP header is stripped, the S-label uniquely
   identifies the app-flow.  When S-Labels are not taken from platform
   label space, IP/UDP header information MUST be provisioned.  The
   provisioned information MUST then be used to identify incoming app-




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   flows based on the combination of S-Label and incoming IP/UDP header.
   Normal receive processing, including PEOF can then take place.

5.  Security Considerations

   The security considerations of DetNet in general are discussed in
   [I-D.ietf-detnet-architecture] and [I-D.sdt-detnet-security].  Other
   security considerations will be added in a future version of this
   draft.

6.  IANA Considerations

   This document makes no IANA requests.

7.  Contributors

   RFC7322 limits the number of authors listed on the front page of a
   draft to a maximum of 5, far fewer than the many individuals below
   who made important contributions to this draft.  The editor wishes to
   thank and acknowledge each of the following authors for contributing
   text to this draft.  See also Section 8.

      Loa Andersson
      Huawei
      Email: loa@pi.nu

      Yuanlong Jiang
      Huawei
      Email: jiangyuanlong@huawei.com

      Norman Finn
      Huawei
      3101 Rio Way
      Spring Valley, CA  91977
      USA
      Email: norman.finn@mail01.huawei.com

      Janos Farkas
      Ericsson
      Magyar Tudosok krt. 11.
      Budapest  1117
      Hungary
      Email: janos.farkas@ericsson.com

      Carlos J. Bernardos
      Universidad Carlos III de Madrid
      Av. Universidad, 30
      Leganes, Madrid  28911



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      Spain
      Email: cjbc@it.uc3m.es

      Tal Mizrahi
      Marvell
      6 Hamada st.
      Yokneam
      Israel
      Email: talmi@marvell.com

      Lou Berger
      LabN Consulting, L.L.C.
      Email: lberger@labn.net

      Stewart Bryant
      Huawei Technologies
      Email: stewart.bryant@gmail.com

      Mach Chen
      Huawei Technologies
      Email: mach.chen@huawei.com

      Andrew G. Malis
      Huawei Technologies
      Email: agmalis@gmail.com

8.  Acknowledgements

   The author(s) ACK and NACK.

   The following people were part of the DetNet Data Plane Solution
   Design Team:

      Jouni Korhonen

      Janos Farkas

      Norman Finn

      Balazs Varga

      Loa Andersson

      Tal Mizrahi

      David Mozes

      Yuanlong Jiang



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      Andrew Malis

      Carlos J.  Bernardos

   The DetNet chairs serving during the DetNet Data Plane Solution
   Design Team:

      Lou Berger

      Pat Thaler

9.  References

9.1.  Normative References

   [I-D.ietf-detnet-ip]
              Korhonen, J., Varga, B., "DetNet IP", 2019.

   [I-D.ietf-detnet-mpls]
              Korhonen, J., Varga, B., "DetNet MPLS", 2019.

   [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>.

   [RFC4385]  Bryant, S., Swallow, G., Martini, L., and D. McPherson,
              "Pseudowire Emulation Edge-to-Edge (PWE3) Control Word for
              Use over an MPLS PSN", RFC 4385, DOI 10.17487/RFC4385,
              February 2006, <https://www.rfc-editor.org/info/rfc4385>.

   [RFC7510]  Xu, X., Sheth, N., Yong, L., Callon, R., and D. Black,
              "Encapsulating MPLS in UDP", RFC 7510,
              DOI 10.17487/RFC7510, April 2015,
              <https://www.rfc-editor.org/info/rfc7510>.

   [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>.

9.2.  Informative References

   [I-D.ietf-6man-segment-routing-header]
              Filsfils, C., Previdi, S., Leddy, J., Matsushima, S., and
              d. daniel.voyer@bell.ca, "IPv6 Segment Routing Header
              (SRH)", draft-ietf-6man-segment-routing-header-18 (work in
              progress), April 2019.




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   [I-D.ietf-detnet-architecture]
              Finn, N., Thubert, P., Varga, B., and J. Farkas,
              "Deterministic Networking Architecture", draft-ietf-
              detnet-architecture-12 (work in progress), March 2019.

   [I-D.sdt-detnet-security]
              Mizrahi, T., Grossman, E., Hacker, A., Das, S.,
              "Deterministic Networking (DetNet) Security
              Considerations, draft-sdt-detnet-security, work in
              progress", 2017.

   [RFC3985]  Bryant, S., Ed. and P. Pate, Ed., "Pseudo Wire Emulation
              Edge-to-Edge (PWE3) Architecture", RFC 3985,
              DOI 10.17487/RFC3985, March 2005,
              <https://www.rfc-editor.org/info/rfc3985>.

Authors' Addresses

   Balazs Varga (editor)
   Ericsson
   Magyar Tudosok krt. 11.
   Budapest  1117
   Hungary

   Email: balazs.a.varga@ericsson.com


   Janos Farkas
   Ericsson
   Magyar Tudosok krt. 11.
   Budapest  1117
   Hungary

   Email: janos.farkas@ericsson.com


   Lou Berger
   LabN Consulting, L.L.C.

   Email: lberger@labn.net


   Andrew G. Malis
   Huawei Technologies

   Email: agmalis@gmail.com





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   Stewart Bryant
   Huawei Technologies

   Email: stewart.bryant@gmail.com


   Jouni Korhonen

   Email: jouni.nospam@gmail.com










































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