RE: [Isis-wg] Re: [Pce] Please commenton draft-ietf-pce-disco-proto-isis-07.txt

Hannes -

> -----Original Message-----
> From: Hannes Gredler [mailto:hannes@juniper.net]
> Sent: Tuesday, September 25, 2007 8:23 AM
> To: Jean Philippe Vasseur (jvasseur)
> Cc: isis-wg@ietf.org; Jean-Philippe Vasseur; pce@ietf.org; Acee
Lindem;
> Meral Shirazipour; Abhay Roy (akr); Jean-Louis Le Roux
> Subject: Re: [Isis-wg] Re: [Pce] Please commenton
draft-ietf-pce-disco-
> proto-isis-07.txt
> 
> hi jp,
> 
> agreed as far as pce is concerned,
> one comment on the *If* section -
> 
> i do not think that replacing a bloated TLV with another
> bloated TLV [genapp] will buy us anything. i.e. the
> size is not getting smaller ;-)
> 
> [genapp] is primarily a vehicle for not running out of
> TLV codepoints for 'per-application' use.
> 
> Given that the pced TLV is well structured and has a
> proper support for TLV nesting there is no need to use
> [genapp].

There is no "pced TLV" - there are only "pced subTLVs" in the context of
the the CAPS TLV.

The use of the CAPS TLV for application info is inappropriate - but as
GENAPP was not defined when the PCE draft was written we have allowed it
to be grandfathered in. But as JP has indicated the goal is that future
extensions and/or new applications use GENAPP.

More importantly, the more recent version of GENAPP emphasizes the need
to separate application info which IS-IS graciously allows to use our
well proven flooding mechanism from the information essential to the
operation of the IS-IS protocol - which helps keep routing working.
Hence the use of MI.

  Les

> 
> so at best a "may" is appropriate, certainly no "should".
> 
> /hannes
> 
> 
> 
> 
> JP Vasseur wrote:
> >    Hi,
> >
> > Some concerns were expressed by several individuals,
> > and OSPF WG chairs about the potential size of the PCED and more
> > recently issues were raised during IESG review because of the
dynamic
> > nature of the CONGESTION TLV carried within the PCED TLV.
> >
> > So the agreement we had was to:
> > 1) Indicate in the document that no further sub-TLV will be added in
the
> > future. Should there be a need to advertise more PCE capability,
this
> can
> > still be part of the PCEP session establishment phase. *If* at some
> point,
> > there is a need to use the IGP to advertise more data, then this
should
> be
> > done using the GENINFO TLV defined draft-ginsberg-isis-genapp
> > potentially using a different Is-IS instance and by using a new
> > Opaque LSA.
> > 2) Remove the CONGESTION TLV from both documents.
> >
> > The updated documents (rev 08) have just been posted and account for
> > these changes along with other comments that we received.
> >
> > Thanks.
> >
> > JP.
> >
> > On Sep 14, 2007, at 5:36 PM, Meral Shirazipour wrote:
> >
> >> Hi,
> >>     In draft draft-ietf-pce-disco-proto-isis-07 Section 4 Page 7,
it is
> >> mentioned:
> >> "
> >> No additional sub-TLVs will be added to the PCED TLV in the future.
If
> >> a future
> >> application requires advertising additional PCE information in
IS-IS,
> >> this will
> >> not be carried in the CAPABILITY TLV.
> >> "
> >> -Is there a technical reasoning behind this decision?
> >>
> >> -I would also change the last two words :" CAPABILITY TLV " to
"IS-IS
> >> Router
> >> Capability TLV ([IS-IS-CAP])" to avoid any confusion with the
> >> PCE-CAP-FLAGS
> >> sub-TLV :)
> >>
> >>
> >>
> >>     In draft draft-ietf-pce-disco-proto-ospf-07 Section 4 Page 7,
it is
> >> mentioned:
> >> "
> >> No additional sub-TLVs will be added to the PCED TLV in the future.
If
> >> a future
> >> application requires advertising additional PCE information in
OSPF,
> >> this will
> >> not be carried in the Router Information LSA.
> >> "
> >> -Same question here.
> >>
> >>
> >> Warm Regards,
> >> Meral
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> Selon Adrian Farrel <adrian@olddog.co.uk
<mailto:adrian@olddog.co.uk>>:
> >>
> >>> Hi,
> >>>
> >>>
http://www.ietf.org/internet-drafts/draft-ietf-pce-disco-proto-isis-
> 07.txt
> >>> has recently been posted. The last couple of revisions addressed
> comments
> >>> raised by the IESG and by the IGP working group chairs, etc.
> >>>
> >>> This is a call to you for a further review of the I-D.
> >>>
> >>> We'll run with a two week deadline to 28th September.
> >>>
> >>> Many thanks,
> >>> Adrian
> >>>
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> Pce mailing list
> >>> Pce@lists.ietf.org <mailto:Pce@lists.ietf.org>
> >>> https://www1.ietf.org/mailman/listinfo/pce
> >>>
> >>
> >>
> >>
> >>
> >>
> >> _______________________________________________
> >> Pce mailing list
> >> Pce@lists.ietf.org <mailto:Pce@lists.ietf.org>
> >> https://www1.ietf.org/mailman/listinfo/pce
> >
> >
> >
> >
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