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Agarwal K.,IBM | Rozner E.,IBM | Dixon C.,Brocade | Carter J.,IBM
HotSDN 2014 - Proceedings of the ACM SIGCOMM 2014 Workshop on Hot Topics in Software Defined Networking | Year: 2014

Software-defined networking provides flexibility in designing networks by allowing distributed network state to be managed by logically centralized control programs. However, this flexibility brings added complexity, which requires new debugging tools that can provide insights into network behavior. We propose a tool, SDN traceroute, that can query the current path taken by any packet through an SDN-enabled network. The path is traced by using the actual forwarding mechanisms at each SDN-enabled device without changing the forwarding rules being measured. This enables administrators to discover the forwarding behavior for arbitrary Ethernet packets, as well as debug problems in both switch and controller logic. Our prototype implementation requires only a few high-priority rules per device, runs on commodity hardware using only the required features of the OpenFlow 1.0 specification, and can generate traces in about one millisecond per hop. © 2014 ACM. Source

Krishnaswamy D.,IBM | Qamar A.,Evolv Inc | Krishnan R.,Brocade | Krishnan R.,Amrita University | And 4 more authors.
Proceedings - IEEE 6th International Conference on Technology for Education, T4E 2014 | Year: 2014

Jnana Edge provides a fundamentally different approach to bringing a knowledge experience, in a qualitatively rich, focused way to specific demographics. This is done through an interdisciplinary convergence of key technological advancements from scalable hierarchical system architectures, cloud computing, dynamic cache hierarchies, and distributed virtualization. Architecture and implementation considerations are presented, particularly for Buddhi Edge which instantiates the Jnana Edge framework in the educational scope. Future directions are also suggested. © 2014 IEEE. Source

Krishnaswamy D.,IBM | Krishnan R.,Brocade | Qamar A.,Evolv Inc | Rajagopal K.,Amrita University
2014 IEEE Global Humanitarian Technology Conference - South Asia Satellite, GHTC-SAS 2014 | Year: 2014

This paper describes a robust, distributed, virtualized fault-tolerant framework for rapid response to catastrophic events such as earthquakes, land-slides, flooding, fire, and epidemics. The approach is distinguished in that fault tolerance in computing, communications, and storage, and the availability of relevant information content at the edge specific to the disaster scenario and location is ensured. The core themes of the framework are the prepositioning of a rich body of pertinent knowledge to facilitate helpers in a disaster area, and the rapid establishment of ad-hoc wireless networks to ensure that high levels of communication and coordination prevails in the response team, and the affected population. The paper suggests the availability of dedicated servers, local servers, cloud servers, and dynamically deployable servers, capable of support disaster edge services, with a fault-tolerant infrastructure capable of supporting and sharing computing, communications, and storage resources across the network. Virtualization of disaster edge services can be support on such servers if desired. Disaster edge services can be made available in a dormant mode of operation ready to respond to a catastrophe when needed. Adaptation of the proposed system to emerging Network Functions Virtualization (NFV) scenarios is described as well. © 2014 IEEE. Source

Agarwal K.,IBM | Dixon C.,Brocade | Rozner E.,IBM | Carter J.,IBM
HotSDN 2014 - Proceedings of the ACM SIGCOMM 2014 Workshop on Hot Topics in Software Defined Networking | Year: 2014

While SDN promises fine-grained, dynamic control of the network, in practice limited switch TCAM rule space restricts most forwarding to be coarse-grained. As an alternative, we demonstrate that using destination MAC addresses as opaque forwarding labels allows an SDN controller to leverage large MAC (L2) forwarding tables to manage a plethora of fine-grained paths. In this shadow MAC model, the SDN controller can install MAC rewrite rules at the network edge to guide traffic on to intelligently selected paths to balance traffic, avoid failed links, or route flows through middleboxes. Further, by decoupling the network edge from the core, we address many other problems with SDN, including consistent network updates, fast rerouting, and multipathing with end-to-end control. © 2014 ACM. Source

Braun R.-P.,Deutsche Telekom AG | Schippel A.,Deutsche Telekom AG | Andryushchenko O.,University of Stuttgart | Weingart J.,Brocade | And 9 more authors.
2015 Opto-Electronics and Communications Conference, OECC 2015 | Year: 2015

Tbit/s transmission capacities are demonstrated in a 1,000 km field trial, provided by Deutsche Telekom, between high performance computing centers of the Universities Dresden and Stuttgart. Brocade and Intel Security Technologies are used to perform Tbit/s generation and processing including software defined networking and network virtualization functionalities. Increased 3 bit/s/Hz spectral efficiency of ADVA Optical Networking 100-Gbit/s transponders, passive wavelength routing, and multi-vendor optical interworking are demonstrated. © 2015 IEEE. Source

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