Browsing by Author "Larrabeiti, David"

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    Depth-wise multi-protocol stateless switching of multicast traffic
    (Scopus, 2012) Fernández Del Carpio, Gonzalo; Larrabeiti, David
    In 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.
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    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 Javier
    As 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.
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    Forwarding of multicast packets with hybrid methods based on Bloom filters and shared trees in MPLS networks
    (IEEE Computer Society, 2017) Larrabeiti, David; Urueña, Manuel
    Multicast forwarding in the context of IP-MPLS networks for services like VPLS has important scalability issues. Alternatives to per-VPLS tree construction based on aggregation of multipoint requests onto shared trees have been studied. Other works have focused on stateless forwarding based on Bloom filters. Both suffer from some type of forwarding anomalies. This paper proposes the combination of both forwarding modes: shared multicast trees and an efficient variant of stateless switching based on Bloom filters. Simulations prove that constraining the forwarding to the shared tree is an effective mechanism to prevent most side effects of Bloom filter-based forwarding, making the combined technique a good trade-off in terms of forwarding state consumption, yielding best performance in terms of overhead with respect to each technique in isolation. © 2017 IEEE.