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Re: [CCAMP] draft-ietf-ccamp-gmpls-g-694-lambda-labels and unique resource identification
Lou,
Maybe this is a silly question but if all lasers in the system are tunable, why does it matter which one is used? Can't the node decide this locally?
Regards,
Jonas
> -----Original Message-----
> From: ccamp-bounces at ietf.org [mailto:ccamp-bounces at ietf.org]
> On Behalf Of Lou Berger
> Sent: den 30 oktober 2009 14:02
> To: Richard Rabbat
> Cc: ccamp at ietf.org
> Subject: Re: [CCAMP]
> draft-ietf-ccamp-gmpls-g-694-lambda-labels and unique
> resource identification
>
> Richard,
>
> Okay let me try again with a specific case. If I have an rro
> or ero that identifies the label (lambda) per your document,
> how does a node know which laser the label corresponds to
> when all lasers in the system are tunable?
>
> Thanks,
> Lou
>
> On 10/29/2009 2:22 PM, Richard Rabbat wrote:
> > sorry for the lag.
> > do you want to describe your use-case further in terms of what you
> > can't do and your proposed change?
> > thanks,
> > Richard.
> >
> > On Thu, Oct 15, 2009 at 8:53 AM, Lou Berger <lberger at labn.net
> > <mailto:lberger at labn.net>> wrote:
> >
> > Authors,
> > Have you given any additional thought on the
> repesentation of
> > tunable
> > lasers (and unique resource identification) beyond what
> is currently in
> > the draft? The current text is:
> > If the node has a tunable wavelength transponder, the tuning
> > wavelength is considered as a part of wavelength switching
> > operation.
> >
> > In the past, labels used for TE LSPs always represented
> a specific
> > resource that is uniquely identifiable by the node that
> allocates the
> > label and resource. Such unique identification is
> important/required
> > for certan restart and other corner cases. Your current
> definition works
> > fine for fixed lasers that can only be mapped to a
> single fiber. But,
> > the defined global label will not uniquely identify a
> resource on a node
> > when (a) tunable lasers are used, or (b) when a node
> supports multiple
> > fixed lasers that can be (optically) switched to a
> particular output
> > interface.
> >
> > What are your thoughts on how to provide such link-scoped unique
> > resource identification in the context of your draft?
> >
> > I don't think it'll be too difficult to address this
> critical point, and
> > see a couple of straightforward solutions if you'd like
> to discuss
> > off-line.
> >
> > Much thanks,
> > Lou
> >
> >
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> >
> >
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