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Re: Optical impairments in draft-ietf-mpls-generalized-signaling-04
- To: Heiles Juergen <Juergen.Heiles@icn.siemens.de>
- Subject: Re: Optical impairments in draft-ietf-mpls-generalized-signaling-04
- From: Yangguang Xu <xuyg@lucent.com>
- Date: Tue, 26 Jun 2001 10:56:02 -0400
- CC: ccamp@ops.ietf.org
- Delivery-date: Tue, 26 Jun 2001 07:57:12 -0700
- Envelope-to: ccamp-data@psg.com
- Organization: Lucent Technologies, Inc.
Juergen,
I agree with you. However, at the signaling time, "label set" can be a handy
tool if you don't have algorithms that is smart enough to consider the
wavelength conversion. It depends what you have now and what's the cost.
Thanks,
Yangguang
Heiles Juergen wrote:
>
> Yangguang,
>
> wavelength conversion is in my view an issue for path selection as you cannot select a certain path if the wavelength doesn't fit and you have no wavelength conversion.
>
> Regards
>
> Juergen
>
> > -----Original Message-----
> > From: Yangguang Xu [SMTP:xuyg@lucent.com]
> > Sent: Tuesday, June 26, 2001 3:13 PM
> > To: Diego Caviglia
> > Cc: Ayan Banerjee; ccamp@ops.ietf.org; Giovanni Fiaschi
> > Subject: Re: Optical impairments in draft-ietf-mpls-generalized-signaling-04
> >
> >
> > Diego,
> >
> > As indicated by the document that Ayan pointed to you, there are many constrains
> > for the optical networking. These constrains can be considered at network
> > planning time, path selection time (routing using OSPF-TE/ISIS-TE) or connection
> > setup time(GMPLS signaling). When a constrain is considered is an engineering
> > issue. We just have to figure out when and where is the best and cheapest to
> > consider a constrain. To wavelength conversion, GMPLS signaling is a good place
> > to handle.
> >
> > Thanks,
> >
> > Yangguang
> >
> > Diego Caviglia wrote:
> > >
> > > Ayan,
> > >
> > > Thanks for your answer but I don't understand why lambda conversion is
> > > a signalling problem and thus is covered in generalized signalling draft while
> > > others optical impairments are routing problem and are covered in a separate
> > > document.
> > >
> > > Moreover even if the document you quoted is a well written and very useful one
> > > it is an informative contribution that simply points out the physically
> > > impairments of an all optical network. It doesn't propose any extension to
> > > OSPF/IS-IS in order to support optical routing.
> > >
> > > Given that in an All Optical Network we have to cope with lots of new
> > > information, as you stated in your document, are we sure that OSPF, in this
> > > environment, scales?
> > >
> > > I mean if it doesn't scale for wavelength availability information distribution
> > > why it has to scales for other optical impairment distribution?
> > >
> > > ----------------------------------------------------------------
> > > Diego Caviglia
> > > Photonic Networks Design and Modelling
> > > E-mail: diego.caviglia@marconi.com
> > > Tel: +39 (0) 10 6003 808
> > > Via A. Negrone 1A 16153 Genoa (Italy)
> > > http://www.marconi.com
> > >
> > > Ayan Banerjee <abanerjee@calient.net> on 25/06/2001 22.26.02
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > To: Diego Caviglia/MAIN/MC1@MCMAIN,
> > > petera@nortelnetworks.con, ccamp@ops.ietf.org
> > >
> > > cc: Giovanni Fiaschi/MAIN/MC1@MCMAIN
> > >
> > >
> > >
> > > Subject: RE: Optical impairments in
> > > draft-ietf-mpls-generalized-signaling- 04
> > >
> > >
> > > --------------------------------------------------------------------------------
> > >
> > > Diego,
> > >
> > > Please see draft-ietf-ipo-impairments-00.txt for optical constraints.
> > >
> > > Thanks,
> > > Ayan
> > >
> > > -----Original Message-----
> > > From: Diego Caviglia [mailto:Diego.Caviglia@marconi.com]
> > > Sent: Monday, June 25, 2001 6:19 AM
> > > To: petera@nortelnetworks.con; ccamp@ops.ietf.org
> > > Cc: Giovanni Fiaschi
> > > Subject: Optical impairments in draft-ietf-mpls-generalized-signaling-04
> > >
> > > Peter ,all,
> > >
> > > a comment about draft-ietf-mpls-generalized-signaling-04. In
> > > the
> > > draft there is the label set object that is very useful in All optical
> > > networks
> > > with CI-incapable nodes but lambda conversion is only one of the
> > > problems
> > > related to path establishment in such networks. I mean what about OSNR
> > > and
> > > non-linear impairments? What about gain variation and power equalization?
> > > Where
> > > are covered these topic?
> > >
> > > If I can find a path feasible from the lambda continuity point of view
> > > who
> > > assure me that I have the needed Q at the end of the all optical path?
> > >
> > > Best regards.
> > >
> > > ----------------------------------------------------------------
> > > Diego Caviglia>
> > > Photonic Networks Design and Modelling
> > > E-mail: diego.caviglia@marconi.com
> > > Tel: +39 (0) 10 6003 808
> > > Via A. Negrone 1A 16153 Genoa (Italy)
> > > http://www.marconi.com