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  • 1.
    Bellagamba, Elisa
    et al.
    Ericsson Research.
    Andersson, Loa
    Ericsson AB.
    Sköldström, Pontus
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Network Systems Laboratory (NS Lab).
    Ward, Dave
    Drake, John
    Configuration of Pro-Active Operations, Administration, and Maintenance (OAM) Functions for MPLS-based Transport Networks using LSP Ping2013Annet (Annet (populærvitenskap, debatt, mm))
  • 2. Bellagamba, Elisa
    et al.
    Kempf, James
    Sköldström, Pontus
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Telekommunikationssystem, TSLab (stängd 2012-01-01).
    Link Failure Detection and Traffic Redirection in an Openflow Network2010Patent (Annet (populærvitenskap, debatt, mm))
    Abstract [en]

    Failure detection and traffic redirection are implemented in an OpenFlow switch. Link failure detection packets, such as Bidirectional Forwarding Detection (BFD) packets, are periodically sent out on links to peer OpenFlow switches, such as via the Multi-protocol Label Switching (MPLS) Transport Profile (MPLS-TP). Link failure detection packets are received from the peer OpenFlow switches on the links, and monitored. A link failure is detected if no incoming link failure detection packets are received on a link for a predetermined interval. In the event of a link failure, traffic is redirected from the failed link to a backup link by altering entries on a flow table of the OpenFlow switch.

  • 3.
    Brewka, Lukasz
    et al.
    DTU.
    Sköldström, Pontus
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Telekommunikationssystem, TSLab (stängd 2012-01-01).
    Gavler, Anders
    Acreo AB.
    Nordell, Viktor
    Acreo AB.
    Wessing, Henrik
    DTU.
    Dittmann, Lars
    DTU.
    ALPHA Proposal of mapping QoS parameters between UPnP home network and GMPLS access2011Inngår i: ACCESS NETWORKS, 2011, s. 226-239Konferansepaper (Fagfellevurdert)
    Abstract [en]

     This paper is treating the interdomain QoS signaling between the home and access domains with a focus on applying it for providing QoS between a UPnP-QoS based home network and GMPLS based access network. The work presented here is defining a possible approach for an interface between UPnP-QoS and GMPLS in order to move towards end-to-end QoS establishment as well as investigating the complexity of such a solution. We present the QoS parameters and mechanisms in both UPnP-QoS and GMPLS and how they can be matched to create a coherent QoS architecture.

  • 4.
    Brewka, Lukasz
    et al.
    DTU.
    Sköldström, Pontus
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Telekommunikationssystem, TSLab (stängd 2012-01-01).
    Gavler, Anders
    Acreo AB.
    Nordell, Viktor
    Acreo AB.
    Wessing, Henrik
    DTU.
    Dittmann, Lars
    DTU.
    QoS enabled resource allocation over an UPnP-QoS/€”GMPLS controlled edge2011Inngår i: 2011 IEEE Consumer Communications and Networking Conference, CCNC'2011, 2011, s. 218-222Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper focuses on the problem of coherent resource allocation within home and access networks. The interdomain QoS signaling discussed here enables the initiation of the QoS provisioning in the home and access from the end device in users home. The home network considered in this paper is UPnP-QoS enabled while the access network is GMPLS based. We propose and implement an interface between aforementioned network segments allowing for end-to-end QoS establishment. We present the QoS parameters and mechanisms in both UPnP-QoS and GMPLS and how they can be matched to create a coherent QoS architecture. Additionally we investigate the complexity of such a solution and present implementation results.

  • 5.
    Devlic, Alisa
    et al.
    Ericsson Research.
    John, Wolfgang
    Ericsson Research.
    Sköldström, Pontus
    A use-case based analysis of network management functions in the ONF SDN model2012Inngår i: European Workshop on SDN, 2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The concept of software-defined networking (SDN) recently gained huge momentum in the industry, driven mainly by IT companies interested in data center applications. In this paper, however, we apply SDN to the carrier domain, which poses additional requirements in terms of network management functions. As a specific use-case we take a virtualized carrier network shared by multiple customers. We consider the current SDN model as defined by the Open Networking Foundation (ONF), including the OpenFlow and OF-config protocols. Through a step-by-step discussion of the rocedures required to configure and manage the virtualized network, we analyze the applicability of the current SDN model as specified by the ONF. As a result, we identify shortcomings and propose necessary extensions to the ONF SDN model. The highlighted extensions include control network bootstrapping considerations, updates to the SDN and NOS model, and most importantly extensions of the OF-config management data model

  • 6.
    Devlic, Alisa
    et al.
    Ericsson Research.
    John, Wolfgang
    Ericsson Research.
    Sköldström, Pontus
    Carrier-grade Network Management Extensions to the SDN Framework2012Inngår i: 8th Swedish National Computer Networking Workshop SNCNW 2012 Stockholm, 2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The concept of software-defined networking (SDN)recently  gained  huge  momentum  in  the  industry,  driven  mainlyby  IT  companies  interested  in  datacenter  applications.  In  thispaper, however, we consider SDN applied in the carrier domain,which poses additional requirements on the network architecture,including  network  management  functions.  We  derive  concreterequirements  for  the  use-case  of  a  virtualized  multi-provideraccess/aggregation  network  based  on  carrier-grade  SDN.  Wethen provide initial architectural considerations for integrationof  network  management  extensions  to  the  SDN  framework  asdefined  by  the  Open  Networking  Foundation  (ONF).  Architec-tural considerations include definition of the required entities andtheir interactions. Finally, we apply the proposed architecture onthe access/aggregation network use-case, outlining procedures ofhow  the  network  management  extensions  can  enable  networkwide and node specific management & configuration

  • 7.
    Gavler, Anders
    et al.
    Acreo AB.
    Nordell, Viktor
    Acreo AB.
    Sköldström, Pontus
    Acreo AB.
    Popp Larsen, Claus
    Acreo AB.
    Wang, Kun
    Acreo AB.
    Demonstration of a GMPLS control plane in an integrated Ethernet based access and distribution network2010Inngår i: Communications and Photonics Conference and Exhibition (ACP), 2010 Asia, 2010, s. 467-468Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In next generation optical access the integration with the distribution network will probably become much more pronounced than today with a focus on "Ethernet everywhere". We have demonstrated a multi-layer control plane over a combined access and aggregation network. The implementation is based on modifying and adapting existing GMPLS protocols.

  • 8.
    Jocha, Dávid
    et al.
    Ericsson Research.
    Kern, András
    Ericsson Research.
    Takács, Attila
    Ericsson Research.
    Sköldström, Pontus
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Telekommunikationssystem, TSLab (stängd 2012-01-01).
    MPLS-OpenFlow based Access/Aggregation network2011Inngår i: 10th GENI Engineering Conference (GEC10), Puerto Rico, 2011Konferansepaper (Fagfellevurdert)
  • 9. John, W.
    et al.
    Kern, A.
    Kind, M.
    Sköldström, Pontus
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Network Systems Laboratory (NS Lab).
    Staessens, D.
    Woesner, H.
    Splitarchitecture: SDN for the carrier domain2014Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 52, nr 10, s. 146-152, artikkel-id 6917416Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The concept of SDN has emerged as a way to address numerous challenges with traditional network architectures by decoupling network control and forwarding. So far, the use cases for SDN mainly targeted data-center applications. This article considers SDN for network carriers, facing operation of large-scale networks with millions of customers, multiple technologies, and high availability demands. With specific carriergrade features such as scalability, reliability, flexibility, modularity, and virtualization in mind, the SPARC EU project has developed the SPARC SplitArchitecture concept. The SplitArchitecture control plane allows hierarchical layering of several control plane layers which can be flexibly mapped to data plane layers. Between control layers open interfaces are used. Furthermore, SplitArchitecture proposes an additional split of forwarding and processing functions in data path elements, enabling switch based OAM functionality and handling of tunneling techniques. The SplitArchitecture concept is evaluated in a prototype demonstrating an SDN version of BRAS: the floating BRAS. The floating BRAS allows creation of residential Internet access services with dynamically managed BRAS instances. The demo is based on a controller enabling protected MPLS transport connections spanning SDN-controlled aggregation and IP/MPLS-based core domains. The prototype showcases how SplitArchitecture enables virtualization of service nodes in an SDN-controlled network, leading to increased flexibility in configuration and placement of service creation functions. Overall, the results show that it is technically and economically beneficial to apply SDN, and specifically the SplitArchitecture concept, to the carrier domain.

  • 10.
    Kempf, James
    et al.
    Ericsson Research.
    Sköldström, Pontus
    Bellagamba, Elisa
    Ericsson Research.
    Kern, Andras
    Ericsson Research.
    Jocha, David
    Ericsson Research.
    Takacs, Attila
    Ericsson Research.
    Scalable Fault Management for OpenFlow2012Inngår i: SDN’12 Workshop on Software Defined Networks Co-located with the IEEE International Conference on Communications (ICC), 2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

     In the OpenFlow based split architecture, data-plane forwarding is separated from control and management functions. Forwarding elements make only simple forwarding decisions based on flow table entries populated by the controller. While OpenFlow does not specify how topology monitoring is performed, the centralized controller can use Link-Layer Discovery Protocol (LLDP) messages to discover link and node failures and trigger restoration actions. This monitoring and recovery model has serious scalability limitations because the controller has to be involved in the processing of all of the LLDP monitoring messages. For fast recovery, monitoring messages must be sent with millisecond interval over each link in the network. This poses a significant load on the controller. In this paper we propose to implement a monitoring function on OpenFlow switches, which can emit monitoring messages without posing a processing load on the controller. We describe how the OpenFlow 1.1 protocol should be extended to support the monitoring function. Our experimental results show that data plane fault recovery can be achieved in a scalable way within 50 milliseconds using this function.

  • 11.
    Kern, András
    et al.
    Ericsson Research.
    Lajos Kis, Zoltán
    Ericsson Research.
    Jocha, Dávid
    Ericsson Research.
    Takács, Attila
    Ericsson Research.
    Sköldström, Pontus
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Telekommunikationssystem, TSLab (stängd 2012-01-01).
    Nordell, Viktor
    Acreo AB.
    Split Architecture: OpenFlow based MPLS access/aggregation network2011Konferansepaper (Fagfellevurdert)
  • 12.
    Larsen, Claus Popp
    et al.
    Acreo AB.
    Popov, Mikhail
    Acreo AB.
    Gavler, Anders
    Acreo AB.
    Wang, Kun
    Nordell, Viktor
    Acreo AB.
    Sköldström, Pontus
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Telekommunikationssystem, TSLab (stängd 2012-01-01).
    Next generation active optical access networks (AON): latest results of the ALPHA project2011Konferansepaper (Fagfellevurdert)
  • 13.
    Nordell, Viktor
    et al.
    Acreo AB.
    Gavler, Anders
    Acreo AB.
    Sköldström, Pontus
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Telekommunikationssystem, TSLab (stängd 2012-01-01).
    BFD-triggered, GMPLS-based, multi-layer ethernet access network protection2011Inngår i: 2011 Asia Communications and Photonics Conference and Exhibition, ACP 2011, 2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper we present a solution for providing protection in a Ethernet based access and metro network. To accomplish this we targeted two issues, protection aimed path computation in networks which does not provide fully disjoint paths, and the design and implementation of bi-directional forward detection (BFD) protocol in a GMPLS controlled Ethernet network. To the best of our knowledge, neither issue has been previously addressed through a similar approach and is therefore to be considered novel in its design and implementation. Our implementation shows good performances and reliability in both performance testing and testbed experiments.

  • 14.
    Nordell, Viktor
    et al.
    Acreo AB.
    Gavler, Anders
    Acreo AB.
    Sköldström, Pontus
    Acreo AB.
    GMPLS controlled multi-layer ethernet2010Inngår i: Proceedings of SPIE Conference Volume 7989: Network Architectures, Management, and Applications VIII, 2010, Vol. 7989Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents the novel idea of using GMPLS control plane for all flavors of an IEEE 802.1Q multi-layer Ethernet, applied to an access and aggregation network scenario. Such a network could provide better resilience, control of resource allocation, bandwidth guarantees and the possibility of having a unified control plane in an environment that includes more and more type of forwarding technologies.It might also be possible to reuse existing equipment and provide backward compatibility for legacy systems when deploying such a GMPLS network over an existing Ethernet based network.This was accomplished through extending GMPLS protocols by defining a new switch capability object, new label object for ML Ethernet, and the development of control plane procedures for handling scenarios specific to ML Ethernet. These extensions has been implemented and verified, along with the development of a ML Ethernet aware PCE, and the results indicates that this novel architecture is plausible and his an interesting potential.

  • 15.
    Popov, Mikhail
    et al.
    Acreo AB.
    Gavler, A
    Acreo AB.
    Sköldström, Pontus
    Acreo AB.
    Brewka, L
    DTU Photonics.
    QoS provisioning in home networks how to integrate fiber, wireless and all the others2010Inngår i: workshop "Beyond the Door Step Can Fiber Also Invade the Home?", Optical Fiber Communication conference (OFC 2010), San Diego, USA, March 21-25, 2010 (Invited), 2010Konferansepaper (Fagfellevurdert)
  • 16.
    Popov, Mikhail
    et al.
    Acreo AB.
    Gavler, Anders
    Acreo AB.
    Sköldström, Pontus
    Brewka, Lukasz
    DTU.
    Integration of QoS provisioning in home and access networks2010Inngår i: Access Networks and In-house Communications, 2010Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Approaches for QoS provisioning using UPnP for home networks and GMPLS for access networks are described. A solution for interworking the UPnP and the GMPLS at the residential gateway is proposed

  • 17.
    Sköldström, Pontus
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Telekommunikationssystem, TSLab (stängd 2012-01-01).
    Abstraction through extended VirtuALisation inOpenflow Networks – AVALON2012Inngår i: European Workshop on Software Defined Networks, 2012Konferansepaper (Annet vitenskapelig)
  • 18.
    Sköldström, Pontus
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Multi-region GMPLS control and data plane integration2008Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    GMPLS is a still developing protocol family which is indented to assume the role of a control plane in transport networks. GMPLS is designed to provide traffic engineering in transport networks composed of different network technologies such as wavelength switched optical networks, Ethernet networks, point-to-point microwave links, etc. Integrating the different network technologies while using label switched paths to provide traffic engineering poses a challenge.

    The purpose of integrating multiple technologies under a single GMPLS control plane is to enable rapid service provisioning and efficient traffic engineering. Traffic engineering in networks provides two primary advantages, network resource utilization optimization and the ability to provide Quality of Service. Utilizing network resources more efficiently translates to lower expenditures for the network provider. Quality of Service can be used to provide the customer with for example guaranteed minimum bandwidth packet services.

    Specifically this thesis focused on the problems of signaling and establishing Forward Adjacency Label Switched Paths (FA-LSPs), and on a experimental method of connecting different network technologies. A testbed integrating an Ethernet network and a wave length division multiplexing network was used to show that the proposed solutions can work in practice.

  • 19.
    Sköldström, Pontus
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Telekommunikationssystem, TSLab (stängd 2012-01-01).
    Gavler, Anders
    Acreo AB.
    Nordell, Viktor
    Acreo AB.
    Virtualizing Open Access Networks2011Inngår i: 7th Swedish National Computer Networking Workshop (SNCNW), 2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Existing  network  virtualization  methods  in  Open-Flow  networks  are  lacking  in  many  respects,  especially  whenapplied in multi-tenant scenarios such as open access networks. Inthis paper we investigate how OpenFlow can be used to simplifythe  use  and  management  of  a  shared  network  infrastructure  inopen  access  networks.  We  then  present  initial  ideas  on  how  toimprove virtualization in OpenFlow networks by applying novelmethods to virtualize the forwarding plane itself.

  • 20.
    Sköldström, Pontus
    et al.
    Acreo AB.
    Gavler, Anders
    Acreo AB.
    Popp Larsen, Claus
    Acreo AB.
    Welin, Annikki
    Ericsson Research.
    Kern, András
    The Acreo GMPLS Testbed: Current Functionality and a Path Towards a Multi-Flavoured Ethernet Hierarchy2009Inngår i: CT-MobileSummit 2009 Conference Proceedings / [ed] Paul Cunningham, Miriam Cunningham, 2009Konferansepaper (Fagfellevurdert)
  • 21. Sköldström, Pontus
    et al.
    Kiran, Yedavalli
    Ericsson Research.
    Network Virtualization and Resource Allocation in OpenFlow-based Wide Area Networks2012Inngår i: SDN’12 Workshop on Software Defined Networks Co-located with the IEEE International Conference on Communications (ICC), 2012, s. 6622-6626Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper we investigate a number of network virtualization models for OpenFlow networks. Specifically, we investigate three sub-modules of the system - the control channel and the software and hardware parts of an OpenFlow switch. We propose a number of extensions to the OpenFlow specification for this purpose and present a model of a full solution that compared to existing systems provides stricter isolation between different virtual networks while at the same time providing more flexibility.

1 - 21 of 21
RefereraExporteraLink til resultatlisten
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  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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Utmatningsformat
  • html
  • text
  • asciidoc
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