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SPRING                                                          D. Patki
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Standards Track                           June 24, 2020
Expires: December 26, 2020


            IPFIX export of Segment Routing IPv6 information
                       draft-patki-srv6-ipfix-00

Abstract

   This document introduces new IP Flow Information Exchange (IPFIX)
   information elemements for exporting IPv6 Segment Routing Header
   (SRH).

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on December 26, 2020.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  New IPFIX Information Elements  . . . . . . . . . . . . . . .   3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Appendix A.  Encoding Example . . . . . . . . . . . . . . . . . .   5
     A.1.  Template Record . . . . . . . . . . . . . . . . . . . . .   5
     A.2.  Data Set  . . . . . . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   IP Flow Information Export (IPFIX) [RFC7011] provides network
   administrators with traffic flow information using the Information
   Elements (IEs) defined in the "IPFIX Information Elements" registry
   [IANA-IPFIX].  Based on the traffic flow information, network
   administrators know the amount and direction of the traffic in their
   network and can then optimize the network when needed.  For example,
   the collected information could be used for traffic monitoring and,
   optionally, for traffic optimization according to the operator's
   policy.

   A new type of Routing Extension Header called Segment Routing Header
   (SRH) is defined by [RFC8754] which is used for applying Segment
   Routing on IPv6 data plane.  This document defined new IPFIX IEs to
   export the contents of SRH.

   Currently this document is limited to exporting based SRH excluding
   the TLV, however, further versions of this document intend to include
   TLVs and variations in the SRH that may be defined in the near
   future.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].








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2.  New IPFIX Information Elements

   This section defines new IPFIX IEs corresponding to various fields in
   the SRH.

   ipv6SRHLastEntry
      The index (zero based) in the Segment List in the SRH, of the last
      element of the Segment List.

   ipv6SRHFlags
      8-bit flags defined in the SRH.

   ipv6SRHTag
      Tag is an identifier that marks a packet as part of a class or
      group of packets, e.g., packets sharing the same set of
      properties.  This information element contains the value of the
      Tag field.

   ipv6SRHSegment
      128-bit IPv6 address that represents an SRv6 segment.

   ipv6SRHSegmentList
      A basicList [RFC6313][RFC7012] of ipv6SRHSegment that contains the
      Segment List in the SRH header.  Like in the SRH header, the
      basicList is encoded starting from the last segment of the SR
      Policy.  That is, the first element of the basicList contains the
      last segment of the SR Policy, the second element contains the
      penultimate segment of the SR Policy, and so on.  This information
      element has variable length.

3.  IANA Considerations

   This document specifies IPFIX IEs to enable export of Segment Routing
   IPv6 information.  IANA needs to assign the following Element IDs for
   these IEs in the "IPFIX Information Elements" registry [IANA-IPFIX]:


   --------------------------------------------------------------------
   | Element |       Name         | Abstract   | Data Type  | Refer-  |
   |   ID    |                    | Data Type  | Semantics  | ence    |
   --------------------------------------------------------------------
   | TBD1    | ipv6SRHLastEntry   | unsigned8  | identifier | RFC8754 |
   | TBD2    | ipv6SRHFlags       | unsigned8  | flags      | RFC8754 |
   | TBD3    | ipv6SRHTag         | unsigned16 | identifier | RFC8754 |
   | TBD4    | ipv6SRHSegment     | ipv6address| default    | RFC8754 |
   | TBD5    | ipv6SRHSegmentList | basicList  | list       | RFC8754 |
   --------------------------------------------------------------------




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4.  Security Considerations

   The security considerations in [RFC7011] apply.

5.  Acknowledgements

   TBD

6.  References

6.1.  Normative References

   [IANA-IPFIX]
              IANA, "IP Flow Information Export (IPFIX) Entities",
              <https://www.iana.org/assignments/ipfix/ipfix.xhtml>.

   [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>.

   [RFC6313]  Claise, B., Dhandapani, G., Aitken, P., and S. Yates,
              "Export of Structured Data in IP Flow Information Export
              (IPFIX)", RFC 6313, DOI 10.17487/RFC6313, July 2011,
              <https://www.rfc-editor.org/info/rfc6313>.

   [RFC7011]  Claise, B., Ed., Trammell, B., Ed., and P. Aitken,
              "Specification of the IP Flow Information Export (IPFIX)
              Protocol for the Exchange of Flow Information", STD 77,
              RFC 7011, DOI 10.17487/RFC7011, September 2013,
              <https://www.rfc-editor.org/info/rfc7011>.

   [RFC8754]  Filsfils, C., Ed., Dukes, D., Ed., Previdi, S., Leddy, J.,
              Matsushima, S., and D. Voyer, "IPv6 Segment Routing Header
              (SRH)", RFC 8754, DOI 10.17487/RFC8754, March 2020,
              <https://www.rfc-editor.org/info/rfc8754>.

6.2.  Informative References

   [RFC7012]  Claise, B., Ed. and B. Trammell, Ed., "Information Model
              for IP Flow Information Export (IPFIX)", RFC 7012,
              DOI 10.17487/RFC7012, September 2013,
              <https://www.rfc-editor.org/info/rfc7012>.








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Appendix A.  Encoding Example

   In this section, an example is provided to show IPFIX encoding format
   for the newly introduced IEs.  Template definition and data set
   corresponding to 3 observed SRH headers are illustrated.


       Observed SRH headers:

       SRH 1:
       Segments Left = 2, Last Entry = 2, Flags = 0, Tag = 0,
       Segment List = 1111::1, 2222::2, 3333::3

       SRH 2:
       Segments Left = 1, Last Entry = 1, Flags = 0, Tag = 100,
       Segment List = 4444::4, 5555::5

       SRH 3:
       Segments Left = 1, Last Entry = 2, Flags = 0, Tag = 200,
       Segment List = 6666::6, 7777::7, 8888::8


A.1.  Template Record

   Sample template consisting of the new IEs:


       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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |          SET ID = 2           |       Length = 24             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |      Template ID = 256        |      Field Count = 4          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |0|   ipv6SRHLastEntry = TBD1   |      Field Length = 1         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |0|     ipv6SRHFlags = TBD2     |      Field Length = 1         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |0|      ipv6SRHTag = TBD3      |      Field Length = 2         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |0|  ipv6SRHSegmentList = TBD5  |      Field Length = 0xFFFF    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                         Figure 1: Sample Template






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A.2.  Data Set

   Data set for the observed SRH headers using the template defined
   above:















































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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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |         SET ID = 256          |           Length = 168        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  ipv6SRHLast  | ipv6SRHFlags  |        ipv6SRHTag = 0         |
      |  Entry = 2    | = 0           |                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |      255      |        List Length = 53       |semantic=allof |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     ipv6SRHSegment = TBD4     |        Field Length = 16      |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             Segment List[0] = 1111::1  (16 bytes)             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             Segment List[1] = 2222::2  (16 bytes)             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             Segment List[2] = 3333::3  (16 bytes)             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  ipv6SRHLast  | ipv6SRHFlags  |        ipv6SRHTag = 100       |
      |  Entry = 1    | = 0           |                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |      255      |        List Length = 37       |semantic=allof |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     ipv6SRHSegment = TBD4     |        Field Length = 16      |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             Segment List[0] = 4444::4  (16 bytes)             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             Segment List[1] = 5555::5  (16 bytes)             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  ipv6SRHLast  | ipv6SRHFlags  |        ipv6SRHTag = 200       |
      |  Entry = 2    | = 0           |                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |      255      |        List Length = 53       |semantic=allof |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     ipv6SRHSegment = TBD4     |        Field Length = 16      |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             Segment List[0] = 6666::6  (16 bytes)             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             Segment List[1] = 7777::7  (16 bytes)             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |             Segment List[2] = 8888::8  (16 bytes)             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                            Figure 2: Data Set






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Author's Address

   Dhananjay Patki
   Cisco Systems, Inc.
   Cessna Business Park SEZ, Kadubeesanahalli
   Bangalore, Karnataka  560087
   India

   Email: dhpatki@cisco.com










































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