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NML-WG discussion

NML-WG discussion. UML diagrams comparison. Basic classes are further extended by using Layer information: PerfSONAR basic classes: Domain Node Port Link Path Network Service Location NDL basic classes: Administrative_domain Network_domain Device Interface Link Location Service

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NML-WG discussion

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  1. NML-WG discussion NML-WG: Monday brainstorming

  2. UML diagrams comparison Basic classes are further extended by using Layer information: • PerfSONAR basic classes: • Domain Node Port Link Path Network Service Location • NDL basic classes: • Administrative_domain Network_domain Device Interface Link Location Service • cNIS basic classes: • (generic) Node Link Interface Location. (Concept of basic class grouping to allow description of domains, networks, etc) NML-WG: Monday brainstorming

  3. Common classes Common classes: • Group (specialized with well known names: group type= administrative domain, network domain, path etc.) • Node/Device • Interface/Port • Link • Location • Service NML-WG: Monday brainstorming

  4. Group Group = abstract type that becomes specialized depending on elements we put it. Ordered and unordered group: General Path (a specialized ordered group): *** Link path: Domain path: Loose path: Domain (a specialized unordered group): Network domain Administrative domain VLAN domain *** do we want to keep Path in here (as it is the only type of ordered group we can think about) or should be moved out of Group (only unordered) NML-WG: Monday brainstorming

  5. Node/device Node: *** *** Extension of this class with layer-specific information might follow (layer1, layer2, layer3 node ….) NML-WG: Monday brainstorming

  6. Interface/port Interface/port: *** Every interface belongs to a node (for interdomain links the far end node may be unknown) Layer1 interface Fiber interface OTN interface …. Layer2 interface SONET interface Ethernet interface ….. Layer3 interface IPv4 interface ….. *** Are technology-specific interfaces (I.e Ethernet interface) subclasses of the layer interfaces (I.e. Layer2 interface) or subclasses of the generic interface? NML-WG: Monday brainstorming

  7. Link Link: • composed of two interfaces (start and end); • links are unidirectional; • links can/are hierarchically organized (a layer3 link = sum of to layer 2 links) *** • concept of link aggregation (serial links and parallel links) • Can be recursive *** how do Links and Paths (Link paths) relate to each other? Is the first a physical object and the second a logical object? NML-WG: Monday brainstorming

  8. Location Location: - Describe a physical point in space (by using geo-coords, street names ….) - A Node is one Location at the time, Links can pass through multiple Locations (I.e. they go through an ordered group of geo-coords) NML-WG: Monday brainstorming

  9. Service Service: Application service Network service ….. Are services offered at a Domain level (with Domain being a Group of Nodes) or by a Node or an Interface directly? What is the distinction between a Service and a capability? NML-WG: Monday brainstorming

  10. Common relationships How the classes related to each other: concept of one-to-one, one-to-many and many-to-one, any-to-any. Comprises, composed of, …are relationship blocks. One to one: One-to-many: Many-to many: Any-to-any: ‘self recursive’ and ‘composed of’. Are these are two distinguished ideas? self recursive is not a group; composed of represents a many to many relationship and is described by a group. NML-WG: Monday brainstorming

  11. Next steps • Definition of basic NML-WG schema classes and attributes • Validation against existing usecases • Which tools we will use to actually produce/write/develop the schema? • UML diagrams • RDF and XML as exchange formats: translations tools between the two. Best practice representation in RDF and XML of the basic ontologies. Adopters are free to choose other syntaxes as they wish. NML-WG: Monday brainstorming

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