[CCAMP] Still have issues in WSON Processing HOP Attribute Encoding in draft-ietf-ccamp-wson-signaling-08

Lou Berger <lberger@labn.net> Sat, 02 August 2014 15:29 UTC

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Date: Sat, 02 Aug 2014 11:30:18 -0400
From: Lou Berger <lberger@labn.net>
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Subject: [CCAMP] Still have issues in WSON Processing HOP Attribute Encoding in draft-ietf-ccamp-wson-signaling-08
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All, (WG, Authors, Young, Giovanni),
	It looks like an unintended encoding change made it into -08 of the
draft, or there remains some confusion in the intended encoding.  The
topic traces back to a discussion in March, see
http://www.ietf.org/mail-archive/web/ccamp/current/msg15894.html.  To
move forward, I'd like to ensure that the authors and any other
interested party, i.e., existing and future implementors, are on the
same page.

I'd like to focus on the intent and the what document should says as
opposed to how we got here, i.e., past confusion.  We need to ensure
that the draft accurately documents the Authors/WG intent.  I am not
trying to propose any technical changes at this very late date.

The area of the document in question is sections 4.2-4.4 and relates to
how the so called sub-TLVs are encoded and processed.  The key text in
question, from rev -07 is:
   To target a specific node, this section defines a WSON_Processing
   object as part of the LSP_REQUIRED_ATTRIBUTE and follows procedures
   defined in [RSVP-RO].

Looking back on the -07 and the March mail thread, the "sub-TLVs"
defined in Section 4.3 and 4.4 should be carried as Attribute TLVs in
LSP_REQUIRED_ATTRIBUTES Objects, and not in ERO_HOP_ATTRIBUTE
Subobjects. Also that there actually is no WSON_Processing object
carried on the wire.

Authors, Young, Giovanni:

    Please confirm if this is correct.  If not, please clarify what was
    intended in the -07 rev of the document.

Assuming it is correct I think it remains unclear what it means for a
LSP_REQUIRED_ATTRIBUTES Object (and not an ERO_HOP_ATTRIBUTE subobject)
to "follows procedures defined in [RSVP-RO]."

Authors, Young, Giovanni:

   Can you clarify what specific procedures defined in [RSVP-RO] are
   to be applied to the LSP_REQUIRED_ATTRIBUTES Objects?

I think it should be possible to align the draft text fairly easily once
the intent is clear, and I'm happy/plan to propose specific text.

Thanks,
Lou