[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: Optical impairments in draft-ietf-mpls-generalized-signaling-04
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