July 1, 2018 Conference paper Open Access

Martínez, Ricardo; Casellas, Ramon; Fàbrega, Josep Maria; Vilalta, Ricard; Muñoz, Raül; Vílchez, Francisco Javier; Nadal, Laia; Svaluto-Moreolo, Michela; Villafranca, A.; Sevillano, P.

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    <subfield code="a">Grant numbers : The research leading to these results has received funding from both Spanish MINECO DESTELLO (TEC2015-69256-R.© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.</subfield>
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    <subfield code="a">&lt;p&gt;The programmability of upcoming transport optical networks is handled by a centralized Transport SDN (T-SDN) controller. The T-SDN controller dynamically computes and selects the resources to automatically accommodate optical connection requests by configuring the involved network elements and devices (i.e., optical switches and transceivers). Additionally, the T-SDN controller should provide management functions to ensure high reliability and correct service status in terms of QoS, QoT, failure detection, etc. during the whole connection duration. These management functions are typically addressed by the operation, administration and maintenance (OAM) Handler. Thereby, the OAM Handler interacts with the monitoring system to gather notifications about connection failures or degradations and trigger the required actions to preserve / recover the services. This work first overviews the designed and implemented architecture integrating required OAM functions into a deployed T-SDN controller for flexi-grid optical networks. Next, two restoration routing approaches are presented, which are compared with respect to the blocked bandwidth ratio (BBR), restorability and average number of used sub-transceivers. The experimental performance is made varying both the traffic load and the generation of signal degraded events of existing connections, forcing their automatic restoration.&lt;/p&gt;</subfield>
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