Feb On*Vector Workshop Semantic Web for Hybrid Networks Dr. Paola Grosso SNE group University of Amsterdam The Netherlands

Feb On*Vector Workshop Semantic Web for Hybrid Networks … the long title Semantic Web-based Distributed Information Systems to Master Hybrid Networks. Keywords (and agenda): -Semantic Web -Distributed Information Systems -Mastering Hybrid Networks -> Control Planes

Feb On*Vector Workshop Semantic Web for Hybrid Networks Semantic Web Semantic Web organizes data so that is contains ‘meaning’ that can be understood by machines and applications. RDF - Resource Description Framework - provides a way to categorize information: - resources are described by URIs; - triplets define the relations between resources: Why? The need to inject more meaning into user requests to the network management planes, more meaning available to take decisions within the management plane. ObjectSubject Predicate

Feb On*Vector Workshop Semantic Web for Hybrid Networks Distributed information Concept of indendently maintained distributed information fits the hybrid networking world and its different administrative domains. References between resources, both internally to a document and externally with the use of URIs. Leverage existing RDF tools. Domain A NDL Domain B NDL seeAlso()

Feb On*Vector Workshop Semantic Web for Hybrid Networks Control Planes Some issues: -what level of detail needs to be exposed abstraction problem; -how do you exchange information between domains:push or pull; -who has right to see what: policies. Control planes setup the inter-domain and intra- domain paths. They need up- to-date and consistent information.

Feb On*Vector Workshop Semantic Web for Hybrid Networks Network Description Language Choice of RDF instead of XML syntax Grounded modeling based on G0805 description: Article: F. Dijkstra, B. Andree, K. Koymans, J. van der Ham, P. Grosso, C. de Laat "A Multi-Layer Network Model Based on ITU-T G.805"

Feb On*Vector Workshop Semantic Web for Hybrid Networks Schemas The result: Topology schema describes devices, interfaces, links and connections between them on a single layer. Layer schema describes specific network technologies and the relation between network layers. Capability schema describes device capabilities. Domain schema describes administrative domains, services within a domain and how to give an abstracted view of the network in a domain. Physical schema describes the physical aspects of network elements. Plus nine technology schemata.

Feb On*Vector Workshop Semantic Web for Hybrid Networks UML diagram Diagram allows easier comparisons with other models.

Feb On*Vector Workshop Semantic Web for Hybrid Networks Topology schema A vocabulary for defining network topology on a single layer.

Feb On*Vector Workshop Semantic Web for Hybrid Networks Multi-layer schemas A vocabulary for defining network layers and interrelations between layer networks.

Feb On*Vector Workshop Semantic Web for Hybrid Networks Tools To facilitate adoption we provide NDL creation and validation tools.

Feb On*Vector Workshop Semantic Web for Hybrid Networks Demonstrations: SC|06 Goal: to show that with one NDL file per GLIF GOLE we can find a suitable path along the various domains.: test/pathfind-new.htm

Feb On*Vector Workshop Semantic Web for Hybrid Networks SC|07 Goal: To show that we can do path finding in a (realistic) multi- layer network:

Feb On*Vector Workshop Semantic Web for Hybrid Networks Standardization A global need for exchange-able topologies: different control planes that want to cooperate. Forum for this activity is the Open Grid Forum - OGF. So far…. NDL, PerfSONAR, cNIS, iShare, Grid5K contributions toward the definition of one model.

Feb On*Vector Workshop Semantic Web for Hybrid Networks NML-WG Co-chairs: Martin Swany (UDelaware) and Paola Grosso (UvA) Purpose: to describe network topologies, so that the outcome is a standardized network description ontology and schema, facilitating interoperability between different projects. The scope is to define one or more schemas to describe: a layer independent network topology properties that are common across multiple network technologies, a mechanism so that other working groups or other projects may combine technology specific schemas with the schemas created by the NML working group. Such a schema can be used to create inter-domain network graphs at various abstraction levels, to provide an information model for service discovery, and to facilitate lightpath provisioning.

Feb On*Vector Workshop Semantic Web for Hybrid Networks From network to applications From the physical architecture To the semantic model for the architecture

Feb On*Vector Workshop Semantic Web for Hybrid Networks Semantic Reasoning

Feb On*Vector Workshop Semantic Web for Hybrid Networks Conclusions The major NDL results: -adoption in the GLIF for the description of GOLEs; -definition of path finding algorithm in multi-layer network; -basis for research into domain abstraction; -part of the standardization effort from the networking community. From the Semantic Web approach we see a promising new research line: semantic for end-to-end applications control.

Feb On*Vector Workshop Semantic Web for Hybrid Networks Links NDL homepage: NML-WG: Thanks to the NDL team! In particular to Freek Dijkstra and Jeroen van der Ham