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I2RS Yang Extensions draft- rfernando -yang-data-mods

I2RS draft- rfernando -yang- mods.txt. I2RS Yang Extensions draft- rfernando -yang-data-mods. R.Fernando , P.Chinnakannan , M.Madhayyan , A.Clemm. I2RS Requirements on Data modeling.

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I2RS Yang Extensions draft- rfernando -yang-data-mods

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  1. I2RS • draft-rfernando-yang-mods.txt I2RS Yang Extensionsdraft-rfernando-yang-data-mods R.Fernando, P.Chinnakannan, M.Madhayyan, A.Clemm

  2. I2RS Requirements on Data modeling • I2RS framework requirements document (draft-rfernando-irs-framework-requirement-00) calls for data model based approach. • I2RS: • shall define the modeling language for specifying a SDM (G5, S1). • provide state access which is structured as per the SDM. (G4) • shall express relationship, be extensible and reference other data models, (S2, S6, S7 ). • support a generic API set that is SDM independent. (A.5, S2, S4) • Service and SDM section define additional requirements (S8, S9, S12, S16)

  3. Yang Data modeling properties • NETMOD/NETCONF Data Modeling Language [RFC6020], • Used for modeling configuration and runtime states in a RS. • Adequate constructs for data organization( containers, lists, leaf-lists and leafs etc.) • Promotes model separation, factorization and reuse (Includes, Imports, Grouping and Uses etc.). • Version management a and model enhancements with backward compatibility • supports variety of meta data information that could be translated into information model. • can be translated into other models like UML or encoded in XML, EXI, Protocol Buffers etc. • Yang data modeling language meets most of I2RS requirements on SDM.

  4. I2RS Operation flow RS I2RS Client I2RS Server I2RS Server I2RS Client Data model root

  5. Yang modifications required • A mechanism to capture the data ownership of a data set injected by I2RS clients (exclusivity property) • A mechanism to express multi-client semantics and operations on a data model(canonical client name) • A mechanism that determines the life time scope of the client data set (ephemeral data)

  6. Exclusive Ownership • Guarantees that a data node and the associated sub-tree to be exclusively owned by a client. • Only exclusive owner can modify (others can only retrieve) • Enables the data model to support the following properties: • Exclusive table. • Exclusive row. • Exclusive cell. • A combination of the above three schemes.

  7. Exclusive Table list of i2rs-route tables Each i2rs-route table owned by one client. List of routes all owned by the same client

  8. Exclusive Row i2rs-route table List of routes Route attributes

  9. Exclusive Cell i2rs-route table List is of routes Route attributes

  10. Canonical Client Name (cname) • Identifies the owner of a data item in a data model • Value references a record in the NACM data model. • The NACM Server in the domain provides the client authentication, authorization and access privileges. • Specified in sub-trees that require exclusive ownership of data. • Constructed using the following rules: • Explicit list node with the single cname key • Additional cname key for list items.

  11. Ephemeral Sub-Tree • Ephemeral statement takes one boolean argument that is either ‘true’ or ‘false’ • Specified at any place in the data model and is inherited by all the descendent nodes. • Indicates that the associated data model sub tree is editable by a client. • This sub tree may not be converted into configuration sub tree. • The sub tree may be converted to operational sub tree.

  12. Ongoing Work not covered in the draft • High availability mechanisms for reconnecting clients to synchronize with the I2RS. • Iterators for data store data and data model schema • On the wire Binary encoding of the data model content • Bulking and and batching of data retrieved/notified. • Dynamic capability exchange

  13. Ask • Adopt Yang as I2RS data modeling language • Adopt this work as starting point for I2RS data model evolution • Join the authors, help us to move this in the right direction

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