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Network operators must deal with multi-layer architectures in their production networks. Not so much time ago, network operators were delivering the IP traffic using ATM. ATM protocol was used to aggregate end-user traffic coming from DSL connections. This traffic was transported Synchronous Digital Hierarchy (SDH) as the standard transport technology for fiber-optic transmission systems in backbone...
A common Transport API is proposed for joint cloud/network orchestration, allowing interworking of heterogeneous control planes to provide provisioning/recovery of QoS-aware E2E services. We present its first demonstration in a multi-partner testbed including data-plane monitoring.
This paper presents the challenges and purpose of building the Traffic Engineering Database (TED) to facilitate Software Defined control of an Elastic Optical Network (EON). It explains how a standardized protocol and data model can facilitate this and describes a YANG model that has been developed to represent the TED including the representation of nodes, transponders, links, and available media...
SDN brings automation to network operation and abstracts the complexity of optical networks. An orchestration layer is required to support multivendor interoperability scenarios. This work demonstrates that an ABNO architecture enables SDN controlled domain interoperability.
We report the experimental testbed evaluation of connectivity provisioning in which OpenFlow and GMPLS control planes interwork by means of an orchestrating stateful PCE. The hierarchical nature of the PCE allows seamless multi-domain operation.
ABNO architecture is proposed in IETF as a framework which enables network automation and programmability thanks to the utilization of standard protocols and components. This work not only justifies the architecture but also presents the first experimental demonstration.
A Network Operating System (NetOS) is a novel paradigm for developing a next-generation network management and operation platform. As we shall describe, NetOS not only goes far beyond the SDN concepts but also constitutes a fundamental enabler for NFV.
This work compares two resilience strategies on multi-layer network dimensioning: dual-plane protection and Multi-Layer Shared Backup Router. Latter provides a significant reduction (up to 24%) on the required IP equipment in comparison with current approach.
Network operators are migrating to a multi-layer architecture with IP/MPLS equipment and optical nodes. Thanks to the advent of reconfigurable optical equipment and a multilayer control plane, current 1+1 node protection at the IP layer in each location is not required anymore. This work studies the network availability in a national network with current 1+1 protection. To do so, an analytical expression...
This paper describes an implementation of multi-layer techniques using the network infrastructure provided by FEDERICA, PASITO and OneLab projects. FEDERICA project provides a network infrastructure, based on virtualization capabilities in both network and computing resources, which creates custom-made virtual environments. PASITO is a layer-2 network that connects universities and research centers...
The distribution of multicast traffic (e.g. IPTV or business point-to-multipoint) in the metropolitan environment requires highly resilient network infrastructures. Currently-deployed fibre ducts in the metropolitan area are typically based on ring topologies interconnected by the dual homing approach. In this study, an easy evolution towards meshed topologies is proposed, based on Double Rings with...
A huge traffic growth is expected in the metro and core network through new FTTH and mobile broadband access connections (e.g. LTE). The network costs of current architectures strongly depend on traffic growth: the higher the traffic, the higher the network costs. Such a cost increase could impact on the ISP's margins. Therefore, new architectural solutions able to face with the huge expected traffic...
Network operators have been facing big changes since IP traffic began overwhelming other kinds of data transport. On the other hand, access networks are continuously improving and it is anticipated that bandwidth demands exponentially increase within next decade to cope with triple-play service requirements. The first level of aggregation, namely metro access networks, can become the bottleneck if...
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