Internet DRAFT - draft-bormann-core-yang-sid-pen
draft-bormann-core-yang-sid-pen
Internet Engineering Task Force C. Bormann
Internet-Draft Universität Bremen TZI
Intended status: Informational 19 November 2021
Expires: 23 May 2022
YANG-CBOR: Allocating SID ranges for PEN holders
draft-bormann-core-yang-sid-pen-01
Abstract
YANG-CBOR, RFC XXXX (draft-ietf-core-yang-cbor) defines YANG Schema
Item iDentifiers (YANG SID), globally unique 63-bit unsigned integers
used to identify YANG items. RFC YYYY (draft-ietf-core-sid) defines
ways to allocate these SIDs on the basis of IANA registries.
The present specification uses these SID allocation mechanisms to
allocate 100 000 SIDs for each of the first 1 000 000 holders of
IANA-registered Private Enterprise Numbers (PENs).
Discussion Venues
This note is to be removed before publishing as an RFC.
Discussion of this document takes place on the CoRE Working Group
mailing list (mailto:core@ietf.org), which is archived at
https://mailarchive.ietf.org/arch/browse/core/.
Source for this draft and an issue tracker can be found at
https://github.com/cabo/sid-pen.
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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Internet-Drafts are draft documents valid for a maximum of six months
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on 23 May 2022.
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Copyright Notice
Copyright (c) 2021 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
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Please review these documents carefully, as they describe your rights
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
5.1. Normative References . . . . . . . . . . . . . . . . . . 4
5.2. Informative References . . . . . . . . . . . . . . . . . 4
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 4
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
YANG-CBOR, RFC XXXX (draft-ietf-core-yang-cbor) defines YANG Schema
Item iDentifiers (YANG SID), globally unique 63-bit unsigned integers
used to identify YANG items. RFC YYYY (draft-ietf-core-sid) defines
ways to allocate these SIDs on the basis of IANA registries.
The present specification uses these SID allocation mechanisms to
allocate 100 000 SIDs for each of the first 1 000 000 holders of
IANA-registered Private Enterprise Numbers (PENs).
We allocate 100 000 mega-ranges, for the SID numbers 300 000 000 000
to 399 999 999 999.
The holder of a PEN ppp ppp then can use the SID numbers
3pp ppp p00 000 to 3pp ppp p99 999 for allocation in a scheme defined
by the holder.
2. Example
The Department for Mathematics and Computer Science of Universität
Bremen holds PEN 30810.
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This confers control over the SID range 303 081 000 000 up to
303 081 099 999 to this PEN holder.
3. Discussion
This allocation provides an extremely-low-threshold way for PEN
holders to get number space for the YANG SIDs used in their YANG
modules. It is, however, not always the approach to recommend to a
module author:
* The space uses 64-bit numbers. While this is of relatively little
consequence due to the delta-encoding used for SIDs in YANG-CBOR,
a few further bytes can be saved by allocating the SIDs in one of
the mega-ranges that are specifically allocated by an organization
(which, for the first 2000 or so, will lead to 32-bit outer
deltas).
* This space has no infrastructure to discover the YANG module
behind a SID. Of course, each PEN holder can provide such
infrastructure, but even then the problem remains how to find that
infrastructure for a SID. (Search engines may mitigate this
somewhat.) On the other hand, relative obscurity may be exactly
what a PEN holder wants to achieve by using this mechanism.
Relying on the PEN registry might theoretically trigger a land-grab
by prospective writers of YANG modules. However, PENs have been
around for decades [RFC1065] and such a land-grab hasn't occurred for
the other allocations implicitly provided by obtaining a PEN.
4. IANA Considerations
This document allocates 100 000 SID mega-ranges as per Section 7.4 of
[I-D.ietf-core-sid].
The contact for the allocation is: IETF CORE Working Group
(core@ietf.org) or IETF Applications and Real-Time Area
(art@ietf.org)
The allocation policy inside the mega-range is "private". The URL is
that of the present specification.
The management of the SID blocks of 100 000 SIDs each, 10 such blocks
for each mega-range 3nn nnn 000 000, is delegated to the PEN holder
for nnn nnx, where x is the sequence number of the SID block in the
mega-range (i.e., the PEN holder for nnn nnx controls SID
3nn nnn x00 000 to 3nn nnn x99 999).
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The technical capacity to ensure the sustained operation of the
registry for a period of at least 10 years (as required for
registries of class "private") is derived from the capacity of IANA
to maintain the PEN number registry.
5. References
5.1. Normative References
[I-D.ietf-core-sid]
Veillette, M., Pelov, A., Petrov, I., Bormann, C., and M.
Richardson, "YANG Schema Item iDentifier (YANG SID)", Work
in Progress, Internet-Draft, draft-ietf-core-sid-18, 18
November 2021, <https://www.ietf.org/archive/id/draft-
ietf-core-sid-18.txt>.
[I-D.ietf-core-yang-cbor]
Veillette, M., Petrov, I., Pelov, A., Bormann, C., and M.
Richardson, "CBOR Encoding of Data Modeled with YANG",
Work in Progress, Internet-Draft, draft-ietf-core-yang-
cbor-17, 25 October 2021,
<https://www.ietf.org/archive/id/draft-ietf-core-yang-
cbor-17.txt>.
5.2. Informative References
[RFC1065] McCloghrie, K. and M. Rose, "Structure and identification
of management information for TCP/IP-based internets",
RFC 1065, DOI 10.17487/RFC1065, August 1988,
<https://www.rfc-editor.org/info/rfc1065>.
Acknowledgments
This document was inspired by the discussion of the authors of
[I-D.ietf-core-yang-cbor] and [I-D.ietf-core-sid] how to handle Rob
Wilton's feedback.
Author's Address
Carsten Bormann
Universität Bremen TZI
Postfach 330440
D-28359 Bremen
Germany
Phone: +49-421-218-63921
Email: cabo@tzi.org
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