RE: GMPLS dynamics vs. issues with optical amplifiers

["Don Fedyk" <dwfedyk@nortel.com>]

Hi all

About a year ago we started to collect requirements for towards this
area in a draft. Our current thinking is that the optical/photonic
networks will have fairly proprietary ways of dealing with the
non-linear properties but that the interface to GMPLS can be summarized
as a fairly generic network interface with a simple metric and a
blocking capability. We only got as far a the requirements.  The draft
is in in need of a refresh I will try to do that shortly.  I have to
contact some other people who were interested in the area. 

If you cannot find a copy of the draft I will send it to you. 

draft-ashwood-ccamp-gmpls-constraint-reqts-00

Regards,
Don 

   

> -----Original Message-----
> From: owner-ccamp@ops.ietf.org 
> [mailto:owner-ccamp@ops.ietf.org] On Behalf Of Filippo Cugini
> 
> 
> Hi all,
> 
> IMO the issue will have to be faced soon. Transparent network 
> elements such 
> as ROADM and PXC are beginning to be deployed in optical 
> transport networks. However, the current GMPLS does not 
> provide any functionality to keep track 
> of the signal quality degradation. Thus, transparent mesh 
> networks must be 
> statically designed, during the network planning, to 
> guarantee that even the 
> most impaired connection  (e.g., the longest path) is 
> acceptable. Otherwise, 
> because of the current GMPLS limits, connections can 
> successfully be set up 
> even if they do not comply with physical parameters 
> constraints. However, the worst case design approach heavily 
> limits the size of the 
> transparent networks.
> 
>   Filippo
> 
> 
> ----- Original Message ----- 
> From: "Adrian Farrel"
> >  [..]
> > - There *might* be a future requirement to signal certain
> >   constraints, but we would need to see the requirements clearly
> >   stated.
> > - There is probably a need to enhance the advertisement of
> >   some key physical attributes of optical links and nodes in
> >   the IGPs. At the moment, however, this information
> >   appears to be gathered through inventory systems and
> >   there has been very little consideration of this requirement.
> 
> 
>