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Network Working Group                                            T. Graf
Internet-Draft                                                  Swisscom
Intended status: Standards Track                          March 26, 2020
Expires: September 27, 2020

        Export of MPLS Segment Routing Label Type Information in
                   IP Flow Information Export (IPFIX)


   This document introduces two additional values in the Information
   Element mplsTopLabelType for IS-IS and OSPF MPLS Segment Routing (SR)
   extensions to enable Segment Routing label type information in IP
   Flow Information Export (IPFIX).

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 RFC 2119 [RFC2119] RFC 8174 [RFC8174] when, and only when, they
   appear in all capitals, as shown here.

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 September 27, 2020.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   This document is subject to BCP 78 and the IETF Trust's Legal
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   (https://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   Besides existing MPLS control plane protocols such as BGP-4
   [RFC8277], LDP [RFC5036] and BGP VPN [RFC4364], IS-IS Extensions
   [RFC8667] and OSPF Extensions [RFC8665] had been added to propagate
   Segment Routing labels for the MPLS dataplane [RFC8660].

   Traffic Accounting in Segment Routing Networks
   [I-D.ali-spring-sr-traffic-accounting] describes how IPFIX can be
   leveraged to account traffic to MPLS Segment Routing label dimensions
   within a Segment Routing domain.

   In the Information Model for IP Flow Information Export IPFIX
   [RFC5102], the information element #46 mplsTopLabelType describes
   which MPLS control plane protocol allocated the top-of-stack label in
   the MPLS label stack.  RFC 7012 section 7.2 [RFC7012] describes the
   IANA Information Element #46 SubRegistry [IANA-IPFIX-IE46] where new
   values should be added.

   By introducing two new values to information element #46
   mplsTopLabelType for IS-IS and OSPF, when Segment Routing with one of
   these two routing protocols is deployed, we get insight which traffic
   is being forwarded based on which MPLS control plane protocol.  A
   typical use case scenario is to monitor MPLS control plane migrations
   from LDP to IS-IS or OSPF.  By looking at the label value itself, it
   is not always clear to which label protocol it belongs to, since they
   could potentially share the same label allocation range.  This is the
   case for IGP-Adjacency Segment SID's and LDP as an example.

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2.  IANA Considerations

   This document specifies two additional values for IS-IS and OSPF
   Segment Routing extension in the sub-registry "IPFIX MPLS label type
   (Value 46)" of the "IPFIX Information Elements" registry in the "IP
   Flow Information Export (IPFIX) Entities" name space.

           | Value|      Description      | Reference |
           | TBD1 | IS-IS Segment Routing |  RFC8667  |
           | TBD2 | OSPF Segment Routing  |  RFC8665  |

       Figure 1: Updates to "IPFIX Information Element #46" SubRegistry

3.  Security Considerations

   The same security considerations apply as for the IPFIX Protocol

4.  Acknowledgements

   I would like to thank Paul Aitken, Loa Andersson, Tianran Zhou,
   Pierre Francois, Paulo Lucente for their review and valuable

5.  References

5.1.  Normative References

              "IANA IP Flow Information Export (IPFIX) Information
              Element #46 SubRegistry",

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,

   [RFC5102]  Quittek, J., Bryant, S., Claise, B., Aitken, P., and J.
              Meyer, "Information Model for IP Flow Information Export",
              RFC 5102, DOI 10.17487/RFC5102, January 2008,

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   [RFC7012]  Claise, B., Ed. and B. Trammell, Ed., "Information Model
              for IP Flow Information Export (IPFIX)", RFC 7012,
              DOI 10.17487/RFC7012, September 2013,

   [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>.

5.2.  Informative References

              Filsfils, C., Talaulikar, K., Sivabalan, S., Horneffer,
              M., Raszuk, R., Litkowski, S., Voyer, D., and R. Morton,
              "Traffic Accounting in Segment Routing Networks", draft-
              ali-spring-sr-traffic-accounting-04 (work in progress),
              February 2020.

   [RFC4364]  Rosen, E. and Y. Rekhter, "BGP/MPLS IP Virtual Private
              Networks (VPNs)", RFC 4364, DOI 10.17487/RFC4364, February
              2006, <https://www.rfc-editor.org/info/rfc4364>.

   [RFC5036]  Andersson, L., Ed., Minei, I., Ed., and B. Thomas, Ed.,
              "LDP Specification", RFC 5036, DOI 10.17487/RFC5036,
              October 2007, <https://www.rfc-editor.org/info/rfc5036>.

   [RFC8277]  Rosen, E., "Using BGP to Bind MPLS Labels to Address
              Prefixes", RFC 8277, DOI 10.17487/RFC8277, October 2017,

   [RFC8660]  Bashandy, A., Ed., Filsfils, C., Ed., Previdi, S.,
              Decraene, B., Litkowski, S., and R. Shakir, "Segment
              Routing with the MPLS Data Plane", RFC 8660,
              DOI 10.17487/RFC8660, December 2019,

   [RFC8665]  Psenak, P., Ed., Previdi, S., Ed., Filsfils, C., Gredler,
              H., Shakir, R., Henderickx, W., and J. Tantsura, "OSPF
              Extensions for Segment Routing", RFC 8665,
              DOI 10.17487/RFC8665, December 2019,

   [RFC8667]  Previdi, S., Ed., Ginsberg, L., Ed., Filsfils, C.,
              Bashandy, A., Gredler, H., and B. Decraene, "IS-IS
              Extensions for Segment Routing", RFC 8667,
              DOI 10.17487/RFC8667, December 2019,

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Author's Address

   Thomas Graf
   Binzring 17
   Zurich  8045

   Email: thomas.graf@swisscom.com

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