deploying and managing ip over wdm networks - Index of

218 Deploying and Managing IP over WDM Networks
Connection
request
Management
plane
Control
plane
Set-up requests
NNI NNI
Soft-permanent connection
Connection
request
Control
plane
Set-up requests
NNI NNI
Switchedconnection
Connection
request
control plane (CP). Basically, through signaling, the CP sets up and releases
connections and may restore a connection in case of a failure. ITU-T Recommendation
G.8080 [1] describes the set of CP components in terms of abstract
entities rather than instances of software components, which are used to
manipulate transport network resources in order to provide such functionalities.
It should be noted that the principle of automatic switching as recommended in
ITU-T Recommendation G.8080 are applicable to SDH transport networks, as
defined in ITU-T Recommendation G.803 [2], and to OTNs, as defined in
ITU-T Recommendation G.872 [3].
The project was set up by the need of network operators to seek how to
both accommodate increasing bandwidth demands for data traffic and provide
optical connections rapidly, dynamically, while making optimal use of network
resources and saving in operating costs. Therefore, the project addresses the two
major drivers for the transport network evolution: optimization of investments
and operating expenses and fulfillment of new emerging requirements by transport
networks. Specifically, these emerging requirements are reducing the complexity
of the transport network (delayering) while optimizing it for the
transport of data traffic, introducing intelligence in optical networks for fast and
flexible provisioning of high-capacity end-to-end connections, optical rerouting
and restoration, interworking functionalities (e.g., for resilience), multidomain
interconnections (e.g., network node interface interoperability), traffic engineering
for multiple levels of QoS, and provisioning of new services such as optical
virtual private networks (OVPNs).
Given the main goal of investigating IP/MPLS over ASON/GMPLS network
scenarios, the project activities regard the definition of functional requirements
of a next generation transport network, the design and implementation of
both optical CP and NNI signaling to enable functionality of set up and tear
down of soft-permanent optical connections, the design and implementation of
an umbrella management system that enables an end-to-end view over different
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Figure 12.1 Soft permanent and switched connections.
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