Cross-stratum orchestration and flexgrid optical networks for data center federations

Velasco, Luis; Asensio, A.; Castro, Alberto; Berral, Josep Ll.; Carrera, David; López, Vı́ctor; Fernández-Palacios, Juan Pedro

doi:10.1109/mnet.2013.6678923

Cited by 30 publications

(21 citation statements)

References 9 publications

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“…Constraint (16) forces to activate a virtual link related to a M2C connection provided that the corresponding CP-VNT was not affected by failures or it was reconnected. Constraints (17)- (19) routes the activated links through the optical network. Finally, constraint (20) ensures that optical resources used in a link does not exceed its capacity.…”

Section: Reconnect Problemmentioning

confidence: 99%

“…In [18], the authors propose an architecture to provide dynamic bandwidth on demand over WDM; in case of failure, dynamic restoration is used. A specific module running on top of ABNO, named as Application Service Orchestrator (ASO), was first proposed in [19] to coordinate DC and network elastically aiming at improving resource utilization and save costs. In [20], [21] the ASO was used to adapt the specific semantic of cloud to that of the network and it was experimentally assessed in [22].…”

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confidence: 99%

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ABNO-driven content distribution in the telecom cloud

Gifre

Tornatore

Contreras

et al. 2017

Optical Switching and Networking

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Abstract-As current sustained traffic growth is expected to strain capacity of today's metro network, novel content distribution architectures where contents are placed closer to the users are being investigated. In that regard, telecom operators can deploy datacenters (DCs) in metro areas, thus reducing the impact of the traffic going from users to DCs. However, effective solutions to distribute contents to those metro DCs and to synchronize contents among them need to be investigated. In this paper, a hierarchical content distribution architecture for the telecom cloud is investigated: core DCs placed in geographically distributed locations, are interconnected through permanent "per content provider" (CP) virtual network topology (CP-VNT); additionally, metro DCs are placed close to users, and need also to be interconnected with the core DCs. CP's data is replicated in the core DCs through the CP-VNT, while metro-to-core (M2C) anycast connections are established periodically for metro DCs to synchronize contents. Since failures in the interconnection network might disconnect the CP-VNTs, in this paper recovery mechanisms are proposed to reconnect topologies and anycast connections. Topology creation, anycast provisioning and recovery problems are first formally stated and modelled as Integer Linear Programs (ILP). Solving these models, however, becomes impractical for realsized scenarios, so heuristic algorithms are also proposed. Exhaustive simulation results show that the investigated architecture provides significant improvements in both supported traffic and restorability compared to the case of a single core DC. Workflows to implement the algorithms within the Applications-based Network Operations (ABNO) architecture and extensions for PCEP are proposed. Finally, the architecture is experimentally validated in our ABNObased iONE test-bed.Keywords: Datacenter interconnection, Optical networks, Content distribution. INTRODUCTIONCloud-based contents are experiencing an exponential growth in users and data volume. In [1], Cisco forecast a yearly global growth of 23% in datacenter (DC)-to-user traffic, 29% in DC-to-DC traffic, and 22% in the intra-DC traffic. Likewise, Alcatel-Lucent highlights that metro traffic will increase 560% by 2017 mainly driven by IP video and cloud traffic [2], growing two times faster than core network traffic. They conclude that placing contents in DCs closer to users can result in a 41% bandwidth reduction in the metro networks. The resulting distributed DC architecture should come together with the extension of the core network functionalities towards the metro, as proposed in [3].Robust telecom infrastructures are needed to minimize the impact of failures on the services [4]; this is especially relevant in the case of video distribution. In fact, prolonged service outages and disruptions have negatively impacted the confidence of important companies toward cloud environments. Telecom operators are in a vantage position to capitalize on highly-reliable cloud services since they o...

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Section: Reconnect Problemmentioning

confidence: 99%

mentioning

confidence: 99%

ABNO-driven content distribution in the telecom cloud

Gifre

Tornatore

Contreras

et al. 2017

Optical Switching and Networking

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“…Regardless of the approach followed, the VNTM sends back a Report (PCRpt) message (9) reporting the results. In case of success, the ABNO controller requests a L2 p2mp path computation to the L2 PCE (10), which now finds a feasible route and returns it to the ABNO controller (11). Since L2 PCE is not active, the ABNO controller module delegates connection set-up to the PM (12) that configures the appropriate rules in each switch.…”

Section: Proposed Workflowsmentioning

confidence: 99%

“…The DCs participating in the communication are considered to be part of a federation. As such, a cloud management system at federation level is in charge of managing intra-DC resources [10]. Typically, one or more core Ethernet programmable switches within each DC are connected to the flexgrid optical core network providing the necessary interconnection among the DCs in the federation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Assessment of ABNO-Driven Multicast Connectivity in Flexgrid Networks

Gifre

Paolucci

Dios

et al. 2015

J. Lightwave Technol.

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Abstract-The increasing demand of internet services is pushing cloud services providers to increase the capacity of their data centers (DC) and create DC federations, where two or more cloud providers interconnect their infrastructures. As a result of the huge capacity required for the inter-DC network, the flexgrid optical technology can be used. In such scenario, applications can run in DCs placed in geographically distant locations and hence, multicast-based communication services among their components are required. In this paper, we study two different approaches to provide multicast services in multi-layer scenarios assuming that the optical network is based on the flexgrid technology: i) establishing a point-to-multipoint optical connection (light-tree) for each multicast request, and ii) using a multi-purpose virtual network topology (VNT) to serve both unicast and multicast connectivity requests. When that VNT is not able to serve an incoming request as a result of lack of capacity, it is reconfigured to add more resources. A control plane architecture based on the Applications-based Network Operations (ABNO) one, currently being standardized by the IETF, is presented; workflows are proposed and PCEP extensions are studied for the considered approaches. The experimental validation is carried-out on a testbed set-up connecting Telefonica, CNIT, and UPC premises.

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“…ACTN is supported by the currently standardized Application-Based Network Operations (ABNO) [4] architecture, which can accept on-demand connection requests via an ABNO controller. In addition, ABNO can be complemented with an Application Service Orchestrator (ASO) on top implementing a northbound interface aiming at facilitating applications' requests using applications' semantics [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Bitrate guarantees strategies for customer virtual networks dynamic reconfiguration

Asensio

Ruiz

Velasco

2016

2016 12th International Conference on the Design of Reliable Communication Networks (DRCN)

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Application-specific Quality of Service (QoS) and additional Service Level Agreement (SLA) parameters to guarantee the committed service quality and avoid service interruption may be crucial in emerging applications and services. Moreover, among the wide range of services over IP transport networks, those requiring bandwidth-on-demand and related to network functions virtualization (NFV) are of particular interest. IETF is working on the Abstraction and Control of Transport Networks (ACTN) framework to facilitate network resources virtualization to support NFV. Customers can request on-demand connectivity between their end-points (EPs) to reconfigure customer virtual network (CVN) topology dynamically. In addition to CVN reconfiguration, QoS constraints and service guarantees can be requested to satisfy application-specific requirements. In this work we study two different approaches to satisfy the committed bitrate guarantees in CVN links. Exhaustive simulation results show that the diversity strategy highly improves performance and provides remarkable CAPEX savings.Index Terms-Customer Virtual network reconfiguration; Abstraction and Control of Transport Networks.

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Cross-stratum orchestration and flexgrid optical networks for data center federations

Cited by 30 publications

References 9 publications

ABNO-driven content distribution in the telecom cloud

ABNO-driven content distribution in the telecom cloud

Experimental Assessment of ABNO-Driven Multicast Connectivity in Flexgrid Networks

Bitrate guarantees strategies for customer virtual networks dynamic reconfiguration

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