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Optical Networks - _Chapter 8 Control and Management_94

Optical Networks - _Chapter 8 Control and Management_94 - 8...

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8 chapter Control and Management N etwork management is an important part of any network. However attractive a specific technology might be, it can be deployed in a network only if it can be managed and interoperates with existing management systems. The cost of operating and managing a large network is a recurring cost and in many cases dominates the cost of the equipment deployed in the network. As a result, carriers pay a lot of attention to minimizing life cycle costs, as opposed to worrying just about up-front equipment costs. We start with a brief introduction to network management concepts in general and how they apply to managing optical networks. We follow this with a discussion of optical layer services and how the different aspects of the optical network are managed. 8.1 Network Management Functions Classically, network management consists of several functions, all of which are im- portant to the operation of the network: 1. Performance management deals with monitoring and managing the various parameters that measure the performance of the network. Performance man- agement is an essential function that enables a service provider to provide quality-of-service guarantees to their clients and to ensure that clients comply 469
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470 Control and Management with the requirements imposed by the service provider. It is also needed to pro- vide input to other network management functions, in particular, fault manage- ment, when anomalous conditions are detected in the network. This function is discussed further in Section 8.5. 2. Fault management is the function responsible for detecting failures when they happen and isolating the failed component. The network also needs to restore traffic that may be disrupted due to the failure, but this is usually considered a separate function and is the subject of Chapter 9. We will study fault management in Section 8.5. 3. Configuration management deals with the set of functions associated with manag- ing orderly changes in a network. The basic function of managing the equipment in the network belongs to this category. This includes tracking the equipment in the network and managing the addition/removal of equipment, including any rerouting of traffic this may involve and the management of software versions on the equipment. Another aspect of configuration management is connection management, which deals with setting up, taking down, and keeping track of connections in a network. This function can be performed by a centralized management system. Alternatively, it can also be performed by a distributed network con- trol entity. Distributed network control becomes necessary when connection setup/take-down events occur very frequently or when the network is very large and complex.
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