Hi Marco, On Mon, 10 Apr 2006, Marco Ruffini wrote:
I'm a PhD student on optical network and I'm following the development of the GMPLS work. I had a recent discussion with people working on the optical transport network who where telling me their concern about creating dynamical path over trails including optical amplifiers. They say that cross-talk and gain fluctuation effects may limit the capability of fast allocating new wavelengths over those trials.
We've talked on and off about these in CCAMP, and there have been drafts to describe some of the various optical impairments to consider.
In the GMPLS structure defined so far, there are link attributes (such as metrics and bandwidth), and typically, these can be combined simply to get a functioning path. Thus, for metrics, the combining function is summation, and for bandwidth, the function is "min".
To accommodate attributes that are not carried as TE extensions today, we may have to add node attributes (say for dB loss across a mirror complex). We may also have to linearize impairments, or define how they are composed across links and nodes; this is not always easy to do.
You say "fast allocating new wavelengths". I would have thought that the issue is not how fast the allocation is, but whether the allocation and ultimately, the optical LSP setup, is successful taking into account optics and physics.
Kireeti. -------