deploying and managing ip over wdm networks - Index of

124 Deploying and Managing IP over WDM Networks
• Presentation of an end-to-end view of the services to the operator showing
the logical hierarchy of all network resources (nodes and links) constituting
the end-to-end connection;
• Maintenance of an inventory of all the network resources relevant
at this layer with their status and their hierarchical relationship—
this system only has knowledge about subnetworks at each of the
domains and about points of interconnection at the edge of those
subnetworks;
• Coordination of the restoration process when services become faulty or
fall under acceptable QoS levels;
• Provision of updates to the fault and performance management functions,
reflecting the changes in the network configuration and the
establishment of new services.
7.2.2 The WDM-NMS
The WDM-NMS performs the management of the WDM transport network
layer and offers a technology-independent management view of the WDM network
domain. It relies on one or several WDM-EMSs that provide a first-level
abstraction of the network and deal with vendor-specific aspects of the network
elements. The WDM-NMS incorporates full configuration management functionality
so that it can be deployed as a stand-alone management system capable
of managing a WDM network by its own.
The configuration management functionality supported by the
WDM-NMS is the following:
• Provisioning of optical paths, including their respective protection
paths;
• Wavelength routing, including the capability of wavelength transition
and implementation of the designed optical path in the network
elements;
• Maintenance of an inventory containing the WDM resources and
WDM connections;
• Coordination of the actions needed for the recovery of paths at the
optical network;
• Discovery of network resources in terms of network elements, ports
per network element, fiber connections between nodes, wavelengths per
fiber, transport capacity per wavelength, and protection mechanisms.
The notifications of change of any resource are forwarded to the INMS