On Tue, Mar 16, 2021 at 10:34 AM Linda Dunbar via Datatracker <noreply@xxxxxxxx> wrote:
Reviewer: Linda Dunbar
Review result: Not Ready
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Document: draft-ietf-core-sid-15
Reviewer: Linda Dunbar
Review Date: 2021-03-16
IETF LC End Date: 2021-03-17
IESG Telechat date: Not scheduled for a telechat
Summary:
This document introduces the globally unique 63-bits integers to identify YANG
items which include data nodes, RPCs, their associated inputs/outputs,
notifications, YANG modules, submodules, and features.
Major issues:
- One of the benefits of YANG is its explicit naming and human-understandable
notations. It will be a nightmare if all the YANG items are represented by
integers. YANG items being represented by integers will be worse than the TYPE
values in the TLVs. At least, the TLV types are in the context of the protocols
and their messages. - It will be a tremendous amount of work to map all YANG
items to globally unique integers. - YANG has been widely deployed without the
numbering system. Which environment will need the integer representations? Who
will validate the numbers used? How to validate the YANG modules represented by
those "integers"?
My initial reaction to this work was that it would never fly in the wild.
But the CORE WG has developed tools and solved many of the problems with YANG SID.
There is a great deal of trust required in the tooling and procedures used to manage the mapping of
YANG identifiers to globally unique integers. These numbers are not intended for
human usage (much like OID strings in SNMP). If the client and server do not agree
on the YANG-to-SID mapping, then the protocols will not work (same as OIDs in SNMP).
I think the administration plan makes sense, but it is still unproven, especially the
delegated subrange name assignments.
The mapping files are independent of the YANG modules so there is no need to alter
any YANG module to use YANG SID. There is a lot of work creating mapping files instead. ;-)
The mappings are not used in YANG modules at all. They are only useful to generate an
efficient binary message encoding for YANG data. (Only. The delta-SID encoding is extremely efficient
and really needed right now.)
Andy
- SID can be mistaken as Segment Identifiers (SID). Suggest using a different
name.
Minor issues:
Nits/editorial comments:
Best Regards,
Linda Dunbar
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