Abstract
A one-to-one association between data and control channels has
traditionally existed in transport networks. Being the control plane
embedded in the data plane, the design of the former, as well as its
resilience, has been addressed in the latter's one. However, a main GMPLS
architectural requirement is to provide a clean separation between control
and data planes. In this sense, the control plane in GMPLS networks may
describe a different topology than the data plane, even realized over a
separated IP network. As a consequence of this, data and control network
design become no more linked in such scenarios. To the best of our
knowledge, no works in the literature have addressed an independent design
of the control plane in GMPLS-enabled networks regardless of the data plane.
In this paper, we provide a method to obtain the optimal GMPLS control plane
design, minimizing the network Capital Expenditures (CAPEX) while matching
specific resilience requirements. To this goal, the problem of finding an
optimal control plane topology that ensures a certain resilience level is
formulated as a non-linear combinatorial model. This model, however, does
not scale properly for large backbone networks. In view of this, a
constructive linear method is also presented and its optimality validated
through simulations on several reference network scenarios. Furthermore, its
benefits in terms of total execution time are also highlighted.
© 2010 IEEE
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