Experimental Codepoint Allocation for Path Computation Element communication Protocol (PCEP)
draft-dhody-pce-pcep-exp-codepoints-01

Abstract

IANA assigns values to the Path Computation Element (PCE) communication Protocol (PCEP) parameters (messages, objects, TLVs). IANA established a new top-level registry to contain all PCEP codepoints and sub-registries. The allocation policy for each new registry is by IETF Consensus.

This document seeks to mark some codepoints for experimental usage of PCEP.

Status of This Memo

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This Internet-Draft will expire on January 1, 2017.

Copyright Notice

Copyright (c) 2016 IETF Trust and the persons identified as the document authors. All rights reserved.

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Table of Contents

• 1. Introduction
• 2. PCEP Messages
• 3. PCEP Objects
• 4. PCEP TLVs
• 5. IANA Considerations
• 5.1. New PCEP Messages
• 5.2. New PCEP Objects
• 5.3. New PCEP TLVs
• 6. Allocation Policy
• 7. Security Considerations
• 8. Acknowledgments
• 9. References
• 9.1. Normative References
• 9.2. Informative References
• Appendix A. Other Codepoints
• Authors' Addresses

1. Introduction

The Path Computation Element communication Protocol (PCEP) provides mechanisms for Path Computation Elements (PCEs) to perform path computations in response to Path Computation Clients (PCCs) requests.

In section 9 of [RFC5440], IANA assigns values to the PCEP protocol parameters (messages, objects, TLVs). IANA established a new top-level registry to contain all PCEP codepoints and sub-registries. The allocation policy for each new registry is by IETF Consensus as described in [RFC5226]. Specifically, new assignments are made via RFCs approved by the IESG. Typically, the IESG will seek input on prospective assignments from appropriate persons (e.g., a relevant Working Group if one exists).

With some recent advancement, there is an enhanced need to experiment with PCEP. It is often necessary to use some sort of number or constant in order to actually test or experiment with the new function, even when testing in a closed environment. In order to run experiment, it is important that the value won't collide not only with existing codepoints but any future allocation.

This document thus set apart some codepoints in PCEP registry and subregistries for experimental usage.

2. PCEP Messages

Some codepoints are requested to be set aside for experimentation with new PCEP messages. The suggested range is 246-255.

3. PCEP Objects

Some codepoints are requested to be set aside for experimentation with new PCEP objects. The suggested range is 224-255.

4. PCEP TLVs

Some codepoints are requested to be set aside for experimentation with new PCEP TLVs. The suggested range is 65280-65535.

[Editor's Note - There have been suggestions to increase this range a little bit more, perhaps to 65024-65535]

5. IANA Considerations

IANA maintains the "Path Computation Element Protocol (PCEP) Numbers" at <http://www.iana.org/assignments/pcep>.

5.1. New PCEP Messages

Within this registry IANA maintains a sub-registry for PCEP Messages (see PCEP Messages at <http://www.iana.org/assignments/pcep>).

Upon approval of this document, IANA is requested to make the following allocations:

+---------+-------------+-------------------+
|   Type  | Description | Allocation Policy |
+---------+-------------+-------------------+
| 246-255 | Unassigned  | Experimental Use  |
+---------+-------------+-------------------+ 

5.2. New PCEP Objects

Within this registry IANA maintains a sub-registry for PCEP Objects (see PCEP Objects at <http://www.iana.org/assignments/pcep>).

Upon approval of this document, IANA is requested to make the following allocations:

+---------+-------------+-------------------+
|   Type  | Description | Allocation Policy |
+---------+-------------+-------------------+
| 224-255 | Unassigned  | Experimental Use  |
+---------+-------------+-------------------+  

5.3. New PCEP TLVs

Within this registry IANA maintains a sub-registry for PCEP TLVs (see PCEP TLV Type Indicators at <http://www.iana.org/assignments/pcep>).

Upon approval of this document, IANA is requested to make the following allocations:

+------------+-------------+-------------------+
|      Type  | Description | Allocation Policy |
+------------+-------------+-------------------+
|65280-65535 | Unassigned  | Experimental Use  |
+------------+-------------+-------------------+    

6. Allocation Policy

The allocation policy for the IANA request in Section 5 is "Experimental". As per [RFC5226], IANA does not record specific assignments for any particular use for this policy. The ongoing experiment code point can be maintained at the PCE WG wiki at <https://trac.tools.ietf.org/wg/pce/trac/wiki>.

As the experiment/standard progress and an early IANA allocation or RFC publication happens, the IANA defined codepoints are used and experimental code points are freed up.

7. Security Considerations

This document does not introduce any new security considerations to the existing protocol. Refer to [RFC5440] for further details of the specific security measures.

8. Acknowledgments

The authors would like to thank Ramon Casellas, Jeff Tantsura and Adrian Farrel, for their feedback and suggestions.

9. References

9.1. Normative References

9.2. Informative References

Appendix A. Other Codepoints

Going through the PCEP IANA registry, following categories exist -

• Essentials (already added in the draft)
  • Messages
  • Objects
  • TLV
• Good to have / simple to add
  • NO-PATH Object NI
  • Metric Type
  • Notification
  • Error
  • Close reason
• Cross Registry
  • IRO Subobjects
  • XRO Subobjects
  • PathKey Subobjects
  • RSVP-TE (where ERO Subobjects is defined)
  • The code points are kept consistent across these registries
• Exist Already
  • OF - private use for 32768-65535
• Not Applicable for Flags
  • Keeping aside some flags as experimental is not be a good idea
  • Experiments can always use a new experimental TLV/Object and use flags inside of it