Re: [Pce] Alexey Melnikov's No Objection on draft-ietf-pce-wson-rwa-ext-11: (with COMMENT)

[Leeyoung <[e-mail]>]

Hi Alexey,

My apology for the delay in responding to your comment. Please see inline for my response.

Thanks.
young

From: Alexey Melnikov [mailto:[e-mail]]
Sent: Thursday, February 7, 2019 4:34 AM
To: Leeyoung <[e-mail]>; The IESG <[e-mail]>
Cc: [e-mail]; Daniele Ceccarelli <[e-mail]>; [e-mail]; [e-mail]
Subject: Re: Alexey Melnikov's No Objection on draft-ietf-pce-wson-rwa-ext-11: (with COMMENT)

Hi,

On Thu, Feb 7, 2019, at 1:44 AM, Leeyoung wrote:

In Section 4.3:



   o  Link Identifiers: Identifies each link ID for which restriction

   is applied. The length is dependent on the link format and the Count

   field.



Is the type field extensible?



YL>> Yes.

In this case the document is problematic, because length depends on the particular link type, so if a receiver doesn't recognize a particular link type, it wouldn't be able to parse the structure. (If this is by design, you might want to be more explicit about this.)

You also need an IANA registry for link format types.

YL>> What I meant extensible is that there are reserved field for the future use. We did not ask for IANA for this; instead, the PCE co-chair (please the attached email from Julien on this matter) suggested to re-use the existing registry defined in LMP. Please see the revised text in the last paragraph of Section 4.3.1:

  “The Type field is extensible. Please refer to the IANA registry
   allocated for Link Management Protocol (LMP) [RFC4204]:
   https://www.iana.org/assignments/lmp-parameters/lmp-
   parameters.xhtml#lmp-parameters-15.”

Do you think we still need IANA registry for link format types explicitly in this document?

Best Regards,
Alexey

--- Begin Message ---

Hi Young,

FWIW, the IANA already manages several similar registries with the same 3 entries (e.g., https://www.iana.org/assignments/lmp-parameters/lmp-parameters.xhtml#lmp-parameters-15). Creating one will help addressing this concern raised by Alexey and Benjamin.

Thanks,

Julien



On 07/02/2019 02:27, Leeyoung wrote:


   What is the mechanism for extensibility of future Link Identifier sub-TLV types?  Should there be a registry?



   YL>>  I am not sure if we need reserve for future interface type. Typical PCEP/GMPLS RFCs do not go beyond this three types and the unnumbered type is flexible enough to accommodate other types than IPv4 and IPv6.


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