Using RDF to Describe Networks
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1 Using RDF to Describe Networks Jeroen van der Ham Advanced Internet Research Group Universiteit van Amsterdam September 30, 2005 J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
2 Introduction Semantic Web Network Description Language Global Lambda Integrated Facility J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
3 What is GLIF? A group of cooperating NRENs, consortia and institutions Make lambdas available as integrated global facility Sharing their research and knowledge Each with different policies J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
4 Why Do We Need Network Descriptions? NIKHEF UvA DAS-2 Van Gogh 32 node 9 node cluster cluster 32x 9x 4 fibers (located at NetherLight) Lighthouse Theo WGsara HP Itanium node node Nortel 5x switch BeautyCees Speculaas Netgear 1 in use Calient 8 fibres GlimmerGlass switch Optical Cross Optical Cross Connect Connect 12 fibers Third Party Topology UvA & NetherLight Intel IXDP Hosts 26 May 2005, Freek Dijkstra, UvA 7/10/21 Stockholm TDM1 OME Cisco 6509 (NorduNet) 6500 SONET TDM Catalyst switch London (UKLight) 10 GbE trunk (VLAN 7-10) Geneva TDM3 NetherLight Core StarLight Force10 (CERN) HDXc (via NetherLight) Not Authoritive SONET TDM Details of NetherLight, Prague see: Routed Internet (CzechLight) 6x (Joint UvA/SARA research lab) Rembrandt SARA SARA 9 node Tile cluster cluster display 9x 24x 9 9x 21 Force10 switch 21 3x tagged (VLAN 7-10, 21 tagged (VLAN 9, 20, 21 untagged unterminated (via NetherLight) To provide an overview of resources Make path discovery easier Do simple problem detection Chicago Chicago New York (StarLight) (StarLight) (routed) New York AR-5 router J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
5 Why Do We Need Network Descriptions? To provide an overview of resources Make path discovery easier Do simple problem detection J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
6 Why Do We Need Network Descriptions? To provide an overview of resources Make path discovery easier Do simple problem detection J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
7 Introduction Semantic Web Network Description Language Why Do We Need Network Descriptions NOW? J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
8 Problem With Descriptions Example We need a description readable by both humans and computers. Problem: Computers still have no common sense. A is connected to B. There is a connection between A and B. J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
9 Problem With Descriptions Example We need a description readable by both humans and computers. Problem: Computers still have no common sense. A is connected to B. There is a connection between A and B. J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
10 Semantic Web Solution: Use Semantic Web techniques: The Semantic Web is an extension of the current web in which information is given well-defined meaning, better enabling computers and people to work in cooperation. (Tim Berners-Lee) J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
11 Resource Description Format Example Resource Description Format (RDF) is a Semantic Web technique. RDF is a lightweight ontology system it describes things using triplets: Document 1 author "Jeroen van der Ham" J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
12 Subject, Property, Object Triplets consist of three elements: Definition Subject The thing it describes. Predicate A property the statement describes. Object The value of the property. J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
13 RDF Data Model Example RDF describes things using triplets: Document 1 author Jeroen name affiliation "Jeroen van der Ham" "UvA" "vdham@science.uva.nl" J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
14 RDF Data Model author name eroen van der Ham" Jeroen affiliation "UvA" J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
15 RDF Namespaces Example Unique terminology is achieved using namespaces Readable for both computers and people Document 1 dc:creator "Jeroen van der Ham" Uses Dublin Core Namespace. J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
16 Real-World RDF Examples RSS RDF Site Summary (v1.0) DOAP Description of a Project FOAF Friend of a Friend J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
17 Real-World RDF Examples RSS RDF Site Summary (v1.0) DOAP Description of a Project FOAF Friend of a Friend J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
18 Real-World RDF Examples RSS RDF Site Summary (v1.0) DOAP Description of a Project FOAF Friend of a Friend J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
19 Network Description Language We started on a set of properties and classes to describe networks: Location Device Interface J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
20 Network Description Language We started on a set of properties and classes to describe networks: Location Device Interface locatedat hasinterface connectedto description name switchedto J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
21 Example of NDL J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
22 Example of NDL J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
23 Example of NDL J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
24 Querying RDF Repositories SPARQL 1 is a SQL-like query language for RDF: Example SELECT?host1?host2 WHERE {?if1 ndl:connectedto?if2.?if2 ndl:connectedto?if1.?host1 ndl:hasinterface?if1.?host2 ndl:hasinterface?if2 } 1 SPARQL Protocol And RDF Query Language J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
25 Query Result Rembrandt3 Glimmerglass J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
26 Query Result Rembrandt3 Rembrandt4 Glimmerglass J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
27 Query Result Rembrandt3 Rembrandt4 Glimmerglass J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
28 Distributed Repositories NDL descriptions can point to other network descriptions: J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
29 SPARQL & Distributed Repositories Querying remote information can be done in two ways: 1 Fetch each description, parse it and then query it. 2 Issue SPARQL queries over HTTP or SOAP (WSDL Interface). Both approaches allow for filtering. J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
30 Applying Network Descriptions in GLIF 1 Each institute creates a description of their network 2 Validate and publish using the portal 3 Description must be automatically updated with each change 4 Users use the portal or tools to find paths and resources J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
31 Extending NDL RDF allows for easy extensibility: Include geographical information (geo) and use with Google Earth Link to FOAF descriptions of administrators Include policy information etc... J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
32 Future Research Publish a portal with links to participants Tools for automatic generation and updating of descriptions Extend NDL to include higher layers Security & filtering possibilities J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
33 Related Work Using RDF for Home Network Configuration G. Klyne Using the Semantic Web to Automate the Operation of a Hybrid Internetwork Franco Travostino (to be published, GridNets 05) J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
34 Questions? Questions? More information: J. van der Ham (AIR - UvA) Using RDF to Describe Networks September 30, / 24
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