Getting started with YANG


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This presentation gives a quick introduction to YANG along with its History, Tools and Comparison of other modelling languages

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Getting started with YANG

  1. 1. Automate | Orchestrate | Remediate Getting Started with YANG Yet Another Next Generation ...
  2. 2. What is YANG? Data modeling language for the NETCONF (network configuration protocol) to model both configuration data as well as state data of network elements to define the format of event notifications emitted by network elements define the signature of remote procedure calls that can be invoked on network elements via the NETCONF protocol
  3. 3. Some history SNMP was the first widely used network management protocol SNMP based on the SMI (Structure of Management Information) language had limitations wrt configuration management of network elements Lack of support for simple things like backup-and-restore of element configuration No concept of transactions (single- or multibox) Many inherent limitations in SMI (e.g. label length) Data modelling limitations for NETCONF led to the creation of a new standard and YANG was adopted SMIng (SMI v3.0) was the basis of YANG The YANG language v1.0 was finalized in Oct 2010 by IETF NETCONF Data Modeling Language Working Group (NETMOD), and is defined in RFC 6020 Version 1.1 is now being discussed by IETF
  4. 4. YANG features Human readable, and easy to learn representation Hierarchical configuration data models Reusable types and groupings (structured types) Extensibility through augmentation mechanisms Supports definition of operations (RPCs) Formal constraints for configuration validation Data modularity through modules and sub-modules Well defined versioning rules
  5. 5. YANGin the NETCONF context
  6. 6. Some YANG language capabilities Organization – Leaf, leaf-list, container, lists, grouping, choice Data model structure – Module, submodule, augment, if-feature, when Constraints – Must, unique, min-elements, max-elements, mandatory Data types – Many built-in types, sub-typing, restrictions Reusable groupings – grouping allows collections of nodes to be reused augments inserts nodes into an existing hierarchy so they can augment existing YANG modules, e.g. a standard module where the implementation provides additional vendor specific data/service deviations override nodes in an existing hierarchy so they can deviate from existing YANG modules, e.g. a standard module where the implementation cannot provide the data/service for a particular node “rpc” statement defines methods, input and output parameters
  7. 7. YANG YAML RAML XML Synonym Yet Another Next Generation YAML Ain't Markup Language Restful API Modeling Language eXtensible Markup Language Purpose Config via NETCONF object data serialization for readability To describe REStful APIs To define structured data textually Benefits Easier to maintain configuration for network devices Human readable data definition Faster, easier and reusable API definition Better than proprietary binary data formats Configuration Support Yes No No Yes, but not easy Transactions support Yes No No Yes, but not easy Transport Independent No No Independent Preceded by SMI v3 JSON YAML 1.2 - Used in Data modelling for networks. Used in projects like OpenDayLight Variety of projects esp in python world for text representation of object data. Eg.Openstack Generating API documentation and stubs for the server and client Where transport independence is required along with textual data definition Comparison Matrix
  8. 8. Sample YANG module acme-system { namespace ""; prefix "acme”; organization "ACME Inc.”; contact ""; description "The module for entities implementing the ACME system.”; revision 2007-11-05 { description "Initial revision.”; } container system { leaf host-name { type string; description "Hostname for this system”; } } }
  9. 9. YANG promoters Juniper brought XML-based configuration for NETCONF to the table Tail-f (now acquired by Cisco) pioneered YANG Ericsson helped in the adoption of YANG by helping it become a standard Some enterprises that have provided YANG support in their offerings include: Brocade Huawei Edgeware Yuma Oracle
  10. 10. Some YANG supported devices 1. Brocade - VCS Fabric Switches 2. Alaxala – Ethernet switches 3. Cisco – IOS 12.4(9)T and later, IOS XE 2.1 and later 4. Ericsson 5. Juniper Networks – JUNOS 7.5 and later 6. RuggedCom – Routers and switches, RX5000 and MX5000 7. Taseon – Intelligent optical networks, TN 320 8. Verivue – Next-generation video distribution, MDX 9020 9. Edgeware – Servers for on-demand TV, WTV-2X 10.Nexor – Messaging Gateways 11.Telco Systems – Carrier Ethernet Multiservice Aggregation, T-Metro 7224
  11. 11. Resources
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