No abstract

In this paper, we propose an approach that relies on distributed traffic generation and monitoring to identify the operational data-paths in a given Software Defined Networking (SDN) driven data-plane. We show that under certain assumptions, there exist necessary and sufficient conditions for formally guaranteeing that all operational datapaths are discovered using our approach. In order to provide reliable communication within the SDN driven data-planes, assuring that the implemented data-paths are the requested (and expected) ones is necessary. This requires discovering the actual operational (running) data-paths in the data-plane. In SDN, different applications may configure different coexisting data-paths, the resulting data-paths a specific network flow traverses may not be the intended ones. Furthermore, the SDN components may be defected or compromised. We focus on discovering the operational data-paths on SDN driven dataplanes. However, the proposed approach is applicable to any data-plane where the operational data-paths must be verified and / or certified. A data-path discovery toolkit has been implemented. We describe the corresponding set of tools, and showcase the obtained experimental results that reveal inconsistencies in well-known SDN applications.

Generalized multiprotocol label switching (GMPLS) promises a unified control plane for a variety of switching technologies by separating the control plane from the forwarding plane. In this paper a brief overview of the ongoing research on different aspects of GMPLS is first presented. Then a comparison is conducted between the network access layer ( N L ) and the optical/physical layer in GMPLS based on the restoration capabilities and the performance analysis of channel connectivity and the traffic aggregation in the two layers. At last the logical channel connections of the WNAL layer are compared to the physical channel connections of the opticaUphysical layer where the probability of blocking (Pb) is calculated considering both wavelength conversion and nonwavelength conversion cases.