Browsing by Author "Fernández Del Carpio, Gonzalo"
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Item 2-STCg optical multicast traffic grooming node for the fishbone-like Peruvian WDM core network(IEEE Computer Society, 2011) Nereida, Llerena; Fernández Del Carpio, GonzaloIn some developing countries, like Peru, optical transport networks are not widely deployed, mainly because of economical factors and geographical difficulties. Its topology has a fishbone-like structure, and it may not need powerful all-optical multicast nodes in order to attend multicast demands. Also, traffic demands may not occupy all the wavelength capacities, which make traffic grooming a necessary capability for saving bandwidth. In the present work we propose an optical node capable of performing multicast routing tasks at traffic grooming level. The node's architecture has been based on two previous works: the 2-Split-Tap-and-Continue (2-STC) node (a multicast capable node with a simple structure, constrained to binary-splitting, but efficient regarding the use of power levels and the number of elements used), and the Stop-and-Go (S/G) Light Tree node (a multicast grooming capable node that uses a labeling technique based on FSK modulation, allowing multicast requests to be routed at the optical level). In this sense, the proposed node improves the use of the optical power, waste of bandwidth and delay, taking advantage of the physical distribution presented in this particular fishbone-like network. Several simulations have been done and results show these assessments. © 2011 IEEE.Item 2015 7th IEEE Latin-American Conference on Communications, LATINCOM 2015: Foreword(Institute of Electrical and Electronics Engineers Inc., 2016) Fernández Del Carpio, Gonzalo2015 7th IEEE Latin-American Conference on Communications, LATINCOM 2015: PrólogoItem Depth-wise multi-protocol stateless switching of multicast traffic(Scopus, 2012) Fernández Del Carpio, Gonzalo; Larrabeiti, DavidIn order to reduce the state due to multicast forwarding in packet switched networks a number of proposals have been studied in the literature. One recently studied approach is MPSS (Multi-Protocol Stateless Switching), in which the path (unicast) or the tree (multicast) is encoded as a Bloom filter carried by a packet header. This sort of source-routed forwarding method makes it possible to eliminate the forwarding state in network nodes. Our proposal looks into improving MPSS and at the same time solving the forwarding anomalies observed in multicast Bloom filter-based approaches. We propose to encode the multicast tree into a stack of variable-length Bloom filters representing the set of output interfaces at a given tree depth, instead of a single filter for the whole tree. We prove that our approach is more efficient than MPSS on multicast, especially in large networks, and that it reduces and binds the scope of forwarding anomalies derived from false positives: packet storms, forwarding loops and flow duplication. Furthermore, packet processing is simpler and the average header overhead is reduced. © 2012 IEEE.Item Design factors in multicast service delivery using the optical layer in core and metro networks(IEEE Computer Society, 2017) Larrabeiti, David; Fernández Del Carpio, Gonzalo; Otero, Gabriel; Ruiz Piñar, Francisco JavierAs optical switching and multiplexing architectures evolve, optical multicast keeps on being a capability advertised by a few core and transport optical equipment vendors. However, to the date, not much use of this service has been made by operators. This work addresses the reasons behind this fact, identifies the key technical design factors in a multicast-capable network and the challenges to face for an effective use of multicast at the optical layer. © 2017 IEEE.Item Implementation of stateless routing mechanisms for multicast traffic on NetFPGA card(Institute of Electrical and Electronics Engineers Inc., 2015) Martínez Aguilar, Roberto B.; Fernández Del Carpio, GonzaloRecent researches have studied how to support the online distribution of multimedia contents efficiently, reducing almost completely the state information within switching nodes. However, many of these studies have been carried out only in a theoretical way and have been verified by simulations, without actual hardware implementations, which will reveal their true performance. One of the main proposals consists on changing the current paradigm in transport networks, by encoding the path information into packet headers using Bloom filters to virtually eliminate the routing tables. In this paper we work on the implementation of a node in a NetFPGA card to evaluate the performance of MPSS and D-MPSS mechanisms (proposed in previous works), which use Bloom filters into the packet headers. To build this, it is required to develop some techniques to work with header Bloom filters of variable size, which need compression and decompression in the fastest possible way, optimizing the resources used during the switching decisions. Performance measurements are provided to verify the forwarding efficiency, considering latencies and the comparison between both methods, in which an advantage for D-MPSS is checked. © 2015 IEEE.Item