Re: Optical impairments in draft-ietf-mpls-generalized-signaling-04

[Yangguang Xu <xuyg@lucent.com>]

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