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Versions: (draft-andersson-mpls-lsp-ping-registries-update) 00 01 02

MPLS Working Group                                          L. Andersson
Internet-Draft                                  Bronze Dragon Consulting
Updates: 8029, 8611 (if approved)                                M. Chen
Intended status: Standards Track                      Huawei Techologies
Expires: October 18, 2020                                   C. Pignataro
                                                           Cisco Systems
                                                                 T. Saad
                                                        Juniper Networks
                                                          April 16, 2020


               Updating the IANA MPLS LSP Ping Parameters
             draft-ietf-mpls-lsp-ping-registries-update-02

Abstract

   This document updates RFC 8029 and RFC 8611 that both define IANA
   registries for MPLS LSP Ping.  It also updates the language that is
   used to define the procedures for responses are sent when an unkwon
   or errored code point is found.  The updates are for clarification
   and to align this name space with recent developments.

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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   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 October 18, 2020.

Copyright Notice

   Copyright (c) 2020 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



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   carefully, as they describe your rights and restrictions with respect
   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
     1.1.  Requirement Language  . . . . . . . . . . . . . . . . . .   3
   2.  Updating the Message Types, Reply Mode and Return Codes
       Registries  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Updating the TLV and sub-TLV registries . . . . . . . . . . .   4
     3.1.  General principles the LSP Ping TLV and sub-TLV
           registries  . . . . . . . . . . . . . . . . . . . . . . .   4
       3.1.1.  Unrecognized Experimental and Private TLVs and sub-
               TLVs  . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Changes to the LSP Ping Registries  . . . . . . . . . . .   5
       3.2.1.  Common Changes to the TLV and sub-TLV Registries  . .   5
   4.  Text Chages/Updates to Related RFCs . . . . . . . . . . . . .   6
     4.1.  Text Changes to RFC 8029  . . . . . . . . . . . . . . . .   6
     4.2.  Text Changes to RFC 8611  . . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
     6.1.  Updates of Message Type, Reply Mode and Return Codes
           Registries  . . . . . . . . . . . . . . . . . . . . . . .   8
     6.2.  Common Registration Procedures for TLVs and sub-TLVs  . .   9
     6.3.  IANA Assignments for TLVs and sub-TLVs  . . . . . . . . .   9
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   When RFC 8029 [RFC8029] was published it contained updates to the
   "Multiprotocol Label Switching (MPLS) Label Switched Paths (LSPs)
   Ping Parameters" IANA name space [IANA-LSP-PING].

   RFC 8611 [RFC8611] updated the LSP Ping IANA registries to match RFC
   8029.  This document further clarifies the entries in those
   registries and makes the definitions more precise.

   This document updates RFC 8029 [[RFC8029] and RFC 8611 [RFC8611] by
   updating two groups of registries as follows:





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   First the registries for Message Types [IANA-MT], Reply Modes
   [IANA-RM] and Return Codes [IANA-RC] are updated.  The changes to
   these registries are minor.

   Second, this document updates the TLV and sub-TLV registries.

   o  TLVs [IANA-TLV-reg]

   o  Sub-TLVs for TLVs 1, 16 and 21 [IANA-Sub-1-16-21]

   o  Sub-TLVs for TLV 6 [IANA-Sub-6]

   o  Sub-TLVs for TLV 11 [IANA-Sub-11]

   o  Sub-TLVs for TLV 20 [IANA-Sub-20]

   o  Sub-TLVs for TLV 23 [IANA-Sub-23]

   o  Sub-TLVs for TLV 27 [IANA-Sub-27]

   The registry for sub-TLVs for TLV 9 [IANA-Sub-9] is not updated.

   Third, some code points (TLVs and sub-TLVs) are "mandatory" and
   "optional".  Contrary to how other RFCs use these words, indicating
   that it is mandatory or optional to include the code points in a
   message, RFC 8029 use the words to indicate that an acction might or
   might nt be nesesary.  The words "mandatory and "optional" are
   dropped and the text is changed to focus on what should be doen.

1.1.  Requirement 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.

2.  Updating the Message Types, Reply Mode and Return Codes Registries

   The following changes are made to the Message Types, Reply Modes and
   Return Codes [IANA-MT] registries.

   o  In the listing of assignments the term "Vendor Private Use" is
      changed to "Private Use"

   o  a small set of code points (4 code points) for Experimental Use is
      added by reducing the range for "Private Use".




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   o  the registration procedure "Specification Required" is changed to
      "RFC Required" and the note "Experimental RFC needed" is removed

   o  the registration procedures "Private Use" and "Experimental Use"
      are added to the table of registration procedures

   o  A note "Not to be assigned" is added for the registration
      procedures "Private Use" and "Experimental Use"

   o  In the list that capture the assignment status, the fields that
      are reserved, i.e.  0, Private Use and Experimental Use are
      clearly marked.

      *  In the Return Codes [IANA-RC] registry the code point "0"
         already been assigned.  This assignment is not changed and this
         registry will not have the "0" value "Reserved".

   The new Registration Procedures layout and the new assignments for
   these registries will be found in Section 6.1.

3.  Updating the TLV and sub-TLV registries

3.1.  General principles the LSP Ping TLV and sub-TLV registries

   The following principles are valid for all the LSP Ping TLV and sub-
   TLV IANA registries

   o  all TLVs and sub-TLVs with a typ in the the range 0-32767 require
      a response if they are not recognized

   o  all TLVs and sub-TLVs in the range 32768-65535 may be silently
      dropped if the are not recognized

   The range of each TLV and sub-TLV registry is divided into wto
   blocks, one with a range from 0 to 32767 for TLVs and sub-TLVs that
   require a response if not recognized.  Another block in the range
   from 32768 to 65535, this block is for TLVs and sub-TLVs that may be
   silently dropped if not recognized.

   Each of the blocks has code point spaces with the following
   registration procedures:

   o  Standards Action

   o  RFC Required

   o  Experimental Use




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   o  Private Use

   The exact defintion of registration procedures for IANA registries
   are found in [RFC8126]

3.1.1.  Unrecognized Experimental and Private TLVs and sub-TLVs

   Unrecognized TLVs and sub-TLVs for Expereimetal USe and Privagte Use
   are handled as any other unrecognised TLV or sub-TLV.

   o  If the unrecognized TLV or sub-TLV is from the Experimental Use
      range (37144-37147) or from the Private Use range (31748-32767) a
      the Return Code of 2 ("One or more of the TLVs was not
      understood") will be sent in the echo response.

   o  If the unrecognized TLV or sub-TLV is from the Experimental Use
      range (64512-64515) or from the Private Use range (64515-65535)
      the TLVs SHOULD be silently ignored.

   IETF does not prescribe how recognized or unrecognized Experimental
   Use and Private Use TLVs and sub-TLVs are handled in experimental or
   private networks, that is up to the agency running the experiment or
   the private network.  The statement above relates to how standard
   compliant implementations will treat the unrecognized TLVs and sub-
   TLVs from these ranges.

3.2.  Changes to the LSP Ping Registries

   This section lists the changes to each MPLS LSP Ping Registry.
   Section 6.1, Section 6.2 and Section 6.3 set out how the new versions
   of the IANA registries should look, together with the registration
   procedures.

3.2.1.  Common Changes to the TLV and sub-TLV Registries

   The following changes are made to the TLV and sub-TLV registries.

   o  the registration procedures "Private Use" and "Experimental Use"
      are added to the table of registration procedures

   o  two small sets of code points (2 times 4 code points) for
      experimental use is added, actually they are take from the range
      for "Private Use".

   o  the registration procedure "Specification Required" is changed to
      "RFC Required" and the note "Experimental RFC needed" is removed





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   o  In the listing of assignements the term "Vendor Private Use" is
      changed to "Private Use"

   o  In the listing of assignments the range for "Experimental Use" is
      added

   o  A note "Not to be assigned" is added for the registration
      procedures "Experimental Use" and "Private Use"

   o  In the list that capture assignment status, the fields that are
      reserved, i.e.  0, Experimental Use and Private Use are clearly
      marked.

   The new Registration Procedures description and the new assignments
   for these registries will be found in Section 6.2 and Section 6.3.

4.  Text Chages/Updates to Related RFCs

   Some referenced RFCs are using the concept "mandatory TLVs" and
   "mandatory sub-TLVs" to indicate that if a TLV or sub-TLV of the
   range 0-16383 or 16384-31743 is present in a message but not
   understood, error message need to be sent in response.

   Since other RFCs are using "mandatory TLVs" and "mandatory sub-TLVs"
   to indicate TLVs and sub-TLVs that must be present in a message, we
   want to discontinue the use of "mandatory" to indicate TLVs and sub-
   TLVs that requires an error message in response if not understood.
   The changes to the RFCs below are intended to align with this
   practice.

4.1.  Text Changes to RFC 8029

   Mandatory and optional is used in this way on page 14 and 15 in
   Section 3 of RFC 8029.

   The text in those two paragraphs are now changed to:

      TLV and sub-TLV Types less than 32768 (i.e., with the high-order
      bit equal to 0) are TLVs and sub-TLVs that MUST either be
      supported by an implementation or result in the Return Code of 2
      ("One or more of the TLVs was not understood") being sent in the
      echo response.

      An implementation that does not understand or support a received
      TLV or sub-TLV with Type greater than or equal to 32768 (i.e.,
      with the high-order bit equal to 1) SHOULD ignore and step over
      the TLV or sub-TLV, however an implementation MAY send an echo
      response with Return Code 2 ("One or more of the TLVs was not



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      understood") as it would have doen if the high order bit had been
      clear.

   In Section 3.8 of RFC 8029 "mandatory" is used in the same way.  The
   first two paragaraphs of this section ar now changed to read:

      The following TLV is a TLV that MAY be included in an echo reply
      to inform the sender of an echo request icluding TLVs or sub-TLVs
      Types greater than or equal to 32768 (i.e., with the high-order
      bit equal to 1) are iether nor supported by the implementation or
      parsed and found to be in error.

      The Value field contains the TLVs, including sub-TLVs, that were
      not understood, encoded as sub-TLVs.

4.2.  Text Changes to RFC 8611

   The "Sub-TLVs for TLV Type 6" registry is now updated to align with
   changes defined in this document.

   The registration procedures for the "Sub-TLVs for TLV Type 6"
   registry will now be like this:

   +-------------+-------------------+---------------------------------+
   | Range       | Registration      | Note                            |
   |             | Procedures        |                                 |
   +-------------+-------------------+---------------------------------+
   | 0-16383     | Standards Action  | This range is for sub-TLVs that |
   |             |                   | require an error message if not |
   |             |                   | recognized.                     |
   | 16384-31743 | RFC Required      | This range is for sub-TLVs that |
   |             |                   | require an error message if not |
   |             |                   | recognized.                     |
   | 31744-32767 | Private Use       | Not to be assigned              |
   | 32768-49161 | Standards Action  | This range is for sub-TLVs that |
   |             |                   | can be silently dropped if not  |
   |             |                   | recognized.                     |
   | 49162-64511 | RFC Required      | This range is for sub-TLVs that |
   |             |                   | can be silently dropped if not  |
   |             |                   | recognized.                     |
   | 64512-65535 | Private Use       | Not to be assigned              |
   +-------------+-------------------+---------------------------------+

              Sub-TLVs for TLV Type 6 Registration Procedures







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5.  Security Considerations

   This document updates IANA registries, some terminology used to
   define, and clarifies the terminology related to the code points in
   the registries.  The document does not change how the code-points in
   the registries are used.  This should not create any new threats.

   However, the updated terminology and the clarifications improve
   security because it makes it more likely that implementations will be
   consistent and harder to attack.

6.  IANA Considerations

   IANA is requested to update the LSP Ping name space as described in
   this document.

6.1.  Updates of Message Type, Reply Mode and Return Codes Registries

   This section details the updated registration procedures and
   allocations for: Message Type, Reply Mode and Return Codes
   registries.

   +---------+--------------------+------------------------------------+
   | Range   | Registration       | Note                               |
   |         | Procedures         |                                    |
   +---------+--------------------+------------------------------------+
   | 0-191   | Standards Action   |                                    |
   | 192-247 | RFC Required       |                                    |
   | 248-251 | Experimental Use   | Not to be assigned                 |
   | 252-255 | Private Use        | Not to be assigned                 |
   +---------+--------------------+------------------------------------+

                    New common registration procedures

   +---------+---------------------------------+-----------------------+
   | Value   | Meaning                         | Reference             |
   +---------+---------------------------------+-----------------------+
   | 0       | Reserved                        | This document         |
   | 1-247   | No changes to the existing      |                       |
   |         | assignments                     |                       |
   | 248-251 | Reserved for Experimental Use   | This document         |
   | 252-255 | Reserved for Private Use        | [RFC8029]             |
   +---------+---------------------------------+-----------------------+

   Common Assignments for the Message Types, Reply Mode and Return Code
                                registries





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   Note that for the Return Code registry the assignment for code point
   zero has been previously assigned, it is not changed but will remain:

   +-------+----------------------------------+------------------------+
   | Value | Meaning                          | Reference              |
   +-------+----------------------------------+------------------------+
   | 0     | No return code                   | [RFC8029]              |
   +-------+----------------------------------+------------------------+

          Assignment for code point 0 in the Return Code registry

6.2.  Common Registration Procedures for TLVs and sub-TLVs

   This section describes the new registration procedures for the TLV
   and sub-TLV registries.  The registry for sub-TLV 9 ([IANA-Sub-9] is
   not changed.

   +-------------+-------------------+---------------------------------+
   | Range       | Registration      | Note                            |
   |             | Procedures        |                                 |
   +-------------+-------------------+---------------------------------+
   | 0-16383     | Standards Action  | This range is for TLVs that     |
   |             |                   | require an error message if not |
   |             |                   | recognized.                     |
   | 16384-31743 | RFC Required      | This range is for TLVs that     |
   |             |                   | require an error message if not |
   |             |                   | recognized.                     |
   | 37144-37147 | Experimental Use  | Not to be assigned              |
   | 31748-32767 | Private Use       | Not to be assigned              |
   | 32768-49161 | Standards Action  | This range is for TLVs that can |
   |             |                   | be silently dropped if not      |
   |             |                   | recognized.                     |
   | 49162-64511 | RFC Required      | This range is for TLVs that can |
   |             |                   | be silently dropped if not      |
   |             |                   | recognized.                     |
   | 64512-64515 | Experimental Use  | Not to be assigned              |
   | 64515-65535 | Private Use       | Not to be assigned              |
   +-------------+-------------------+---------------------------------+

                  TLV and sub-TLV Registration Procedures

6.3.  IANA Assignments for TLVs and sub-TLVs

   The two tables in this section describes the updated IANA assignments
   for the TLV and sub-TLV registries.  The registry for sub-TLV 9
   ([IANA-Sub-9] is not changed.





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   +-------------+-------------------+------------------+--------------+
   | Type        | TLV name          | Reference        | sub-TLV      |
   |             |                   |                  | registry     |
   +-------------+-------------------+------------------+--------------+
   | 0           | Reserved          | This document    |              |
   | 1-31743     | [any]             | No changes to    | [any]        |
   |             |                   | the current      |              |
   |             |                   | registry         |              |
   | 37144-37147 | Reserved for      | This document    | NA           |
   |             | Experimental Use  |                  |              |
   | 31748-32767 | Reserved for      | This document    | NA           |
   |             | Private Use       |                  |              |
   | 32768-64511 | [any]             | No changes to    | [any]        |
   |             |                   | the current      |              |
   |             |                   | registry.        |              |
   | 64512-64515 | Reserved for      | This document    | NA           |
   |             | Experimental Use  |                  |              |
   | 64515-65535 | Reserved for      | This document    | NA           |
   |             | Private Use       |                  |              |
   +-------------+-------------------+------------------+--------------+

                              TLV Assignments

   Updated Sub-TLV assignments

   +-------------+-------------------------------+---------------------+
   | Type        | TLV name                      | Reference           |
   +-------------+-------------------------------+---------------------+
   | 0           | Reserved                      | This document       |
   | 1-31743     | [any]                         | No changes to the   |
   |             |                               | current registry    |
   | 37144-37147 | Reserved for Experimental Use | This document       |
   | 31748-32767 | Reserved for Private Use      | This document       |
   | 32768-64511 | [any]                         | No changes to the   |
   |             |                               | current registry.   |
   | 64512-64515 | Reserved for Experimental Use | This document       |
   | 64515-65535 | Reserved for Private Use      | This document       |
   +-------------+-------------------------------+---------------------+

                            Sub-TLV Assignments

7.  Acknowledgements

   The authors wish to thank Adrian Farrel, who both made very useful
   comments and agreed to serve as the document shepherd.






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   The authors also wish to thank Micelle Cotton who very patiently
   worked with us to determine how our registries could and should be
   updated.

8.  References

8.1.  Normative References

   [IANA-LSP-PING]
              "Multiprotocol Label Switching (MPLS) Label Switched Paths
              (LSPs) Ping Parameters",
              <https://www.iana.org/assignments/mpls-lsp-ping-
              parameters/mpls-lsp-ping-parameters.xhtml/>.

   [IANA-MT]  "Message Types", <https://www.iana.org/assignments/mpls-
              lsp-ping-parameters/mpls-lsp-ping-
              parameters.xhtml#message-types>.

   [IANA-RC]  "Return Codes", <https://www.iana.org/assignments/mpls-
              lsp-ping-parameters/#return-codes>.

   [IANA-RM]  "Reply Modes", <https://www.iana.org/assignments/mpls-lsp-
              ping-parameters/#reply-modes>.

   [IANA-Sub-1-16-21]
              "Sub-TLVs for TLV Types 1, 16, and 21",
              <https://www.iana.org/assignments/https://www.iana.org/
              assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-
              parameters.xhtml#sub-tlv-1-16-21>.

   [IANA-Sub-11]
              "Sub-TLVs for TLV Type 11",
              <https://www.iana.org/assignments/mpls-lsp-ping-
              parameters/mpls-lsp-ping-parameters/mpls-lsp-ping-
              parameters.xhtml#sub-tlv-11>.

   [IANA-Sub-20]
              "Sub-TLVs for TLV Type 20",
              <https://www.iana.org/assignments/mpls-lsp-ping-
              parameters/mpls-lsp-ping-parameters/mpls-lsp-ping-
              parameters.xhtml#sub-tlv-20>.

   [IANA-Sub-23]
              "Sub-TLVs for TLV Type 23",
              <https://www.iana.org/assignments/mpls-lsp-ping-
              parameters/mpls-lsp-ping-parameters/mpls-lsp-ping-
              parameters.xhtml#sub-tlv-23>.




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   [IANA-Sub-27]
              "Sub-TLVs for TLV Type 27",
              <https://www.iana.org/assignments/mpls-lsp-ping-
              parameters/mpls-lsp-ping-parameters/mpls-lsp-ping-
              parameters.xhtml#sub-tlv-27>.

   [IANA-Sub-6]
              "Sub-TLVs for TLV Type 6",
              <https://www.iana.org/assignments/mpls-lsp-ping-
              parameters/mpls-lsp-ping-parameters/mpls-lsp-ping-
              parameters.xhtml#sub-tlv-6>.

   [IANA-TLV-reg]
              "TLVs", <https://www.iana.org/assignments/mpls-lsp-ping-
              parameters/mpls-lsp-ping-parameters.xhtml#tlvs>.

   [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>.

   [RFC8029]  Kompella, K., Swallow, G., Pignataro, C., Ed., Kumar, N.,
              Aldrin, S., and M. Chen, "Detecting Multiprotocol Label
              Switched (MPLS) Data-Plane Failures", RFC 8029,
              DOI 10.17487/RFC8029, March 2017,
              <https://www.rfc-editor.org/info/rfc8029>.

   [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>.

   [RFC8611]  Akiya, N., Swallow, G., Litkowski, S., Decraene, B.,
              Drake, J., and M. Chen, "Label Switched Path (LSP) Ping
              and Traceroute Multipath Support for Link Aggregation
              Group (LAG) Interfaces", RFC 8611, DOI 10.17487/RFC8611,
              June 2019, <https://www.rfc-editor.org/info/rfc8611>.

8.2.  Informative References

   [IANA-Sub-9]
              "Sub-TLVs for TLV Type 9",
              <https://www.iana.org/assignments/mpls-lsp-ping-
              parameters/mpls-lsp-ping-parameters/mpls-lsp-ping-
              parameters.xhtml#sub-tlv-9>.







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   [RFC8126]  Cotton, M., Leiba, B., and T. Narten, "Guidelines for
              Writing an IANA Considerations Section in RFCs", BCP 26,
              RFC 8126, DOI 10.17487/RFC8126, June 2017,
              <https://www.rfc-editor.org/info/rfc8126>.

Authors' Addresses

   Loa Andersson
   Bronze Dragon Consulting

   Email: loa@pi.nu


   Mach Chen
   Huawei Techologies

   Email: mach.chen@huawei.com


   Carlos Pignataro
   Cisco Systems

   Email: cpignata@cisco.com


   Tarek Saad
   Juniper Networks

   Email: tsaad@juniper.net






















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