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.