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AutoBAHN Stitching Framework Overview

This presentation outlines the stitching framework for AutoBAHN, covering the data model, stitching engine, parameters, attributes, and scheduling process. It explains the three parts of stitching, the domain structure, and the sample parameters and values. The framework is designed for inter-domain connectivity and can work in both manual and automated environments.

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AutoBAHN Stitching Framework Overview

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  1. Stitching framework for AutoBAHNVictor Reijs, HEAnet TNC2007, May 23rd, 2007 victor.reijs@heanet.ie

  2. Outline • Stitching framework for AutoBAHN… • Three parts to stitch… • Stitching Data model… • The stitching engine… • Sample parameters, attributes and values… • AutoBAHN resource scheduling process… • Warp up…

  3. Stitching framework • A general stitching Framework and Data model to describe how to stitch technology domains • It is an inter-domain framework • Should work in manual (NOC)and automated environment (e.g. AutoBAHN) • A definition of the offered service should exist for the initial AutoBAHN service : 1 Gbit/s framed service, 98% throughput, VLAN/port based • It is assumed that individual domains have full autonomyso they can determine their own policy, technology, topology, etc. and they don’t have knowledge about their neighboring domains

  4. Three parts to stitch • The Domain Core will expose certain parameters to make sure that path and peering negotiations can be undertaken by a higher entity (such as a human or IDM). • Left Logical interfaces require parameters to be configured to communicate with peering domains which want to connect to this domain. • Right Logical interfaces also require parameters to setup communications with other domains.

  5. Some Logical interfaces

  6. Scenario with two SDH - SDH networks

  7. SDH - SDH scenario

  8. Stitching Data model • Objects • Domains… • Parameters… • Attributes • Each object has several attributes (meta data in most cases) • Attributes for Parameters have been defined • Inheritance • Attributes can inherit their value from the base definition.

  9. Domains • Administrative domaina domain belonging to a certain operational management entity, like a NREN • Terminating domaina user domain; can be a full blown network or a single machine • User domaina domain that represent an end user • Linking domaindomain(s) which makes up the path and controlled by the AutoBAHN JRA3 • Source domainthe domain where the path starts • Destination domainthe domain where the path stops • Provisioning domaina domain which is characterised by its provisioning tool (BLUEnet, etc.) • Technology domaina domain using a specific technology; like SDH/SONET, Ethernet, IP, OOO

  10. Parameter • All stitching parameter (s) have the same attributes (meta data): • Name • Data • Dimension( representation of the data) • Type( which logical interface the parameter belongs to) • Intervention (indicates ways a parameter can be changed) human, remote, auto, pass • Involved(which part of the domain is involved in determining the parameter value) interface, whole domain • Dependency(dependency on other parameters that determine the data value of the parameter) • Logic(how other domains/interfaces take part in determining parameter values) peering, none, contiguous, path • Method (of Logic used to compare parameter values) same, different, min, max, sum, function • Default if a parameter value is not specified, this default value should be assigned. • The attribute value can be a single value, a list, a range or a function

  11. Sample parameters, attributes and values Just for illustration

  12. The stitching engine • Parameters are grouped for convenience in Logical interfacese.g. Identity, Performance, Physical, Ethernet, SDH/SONET, VCG, MPLS, IP. • New parameters can be defined easilythere are no boundaries to the number of parameters provided its attributes are covered by the Data model • The stitching engine must be able to handle any number of parameters • The stitching engine must be able to properly evaluate all attributes (metadata) of the parameters in any path chosen.

  13. Stitching in AutoBAHN • All relevant domain parameters in the path are gathered from source to destination domain • The stitching engine runs in the destination domain of AutoBAHN system • The stitching engine proposes possible parameter values for each domain (semantic web) and a feasibility/schedule check process runs in each of the domains from destination to source. • Failure of feasibility/schedule in a domain: • go back to the source domain (like in RSVP) and try a new path • The stitching Data model is incorporated in the abstract topology model (including all attributes)

  14. AutoBAHN reservation scheduling process

  15. Wrap up… • Checks have been done on: • GMPLS/ASON parameters • GN2-cNIS (common Network Information System) which holds network/path/etc related schema • Support on manual building of paths over GEANT+ • The Data model is extendable, flexible and not pre-determined • The parameter attributes (meta data) define how the parameters are evaluated • Versitile framework to stitch different domains together, so thus not only AutoBAHN…

  16. Questions?

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