Learn YANG! Full Tutorial for Beginners (Yet Another Next Generation)

YANG is a data modelling language used to model configuration data, state data, Remote Procedure Calls, and notifications for network management protocols. In today's tutorial, let's do a deep dive and learn the language from scratch.

Ultra Config:

Ultra Config Generator is an enterprise-grade software application for multi-vendor network automation. The product enables organizations to build robust automation solutions compatible with all major equipment vendors such as Cisco, Juniper and Huawei.

Today's Tutorial:
(Learn YANG in 16 mins)

RFC 7950 - The YANG 1.1 Data Modeling Language:

pyang GitHub:

pyang Command Line Reference:

yang2dsdl Command Line Reference:

IETF YANG Modules:

OpenConfig GitHub:

#yang #ietf #pyang #networkautomation #netconf

[AshutoshKumar-wyvn]

Thank you for a great overview. FYI, I did encounter few problems for which I've noted the solutions below.
1. One needs to use switch `-x` to ignore yang version error
2. When using python virtual environment, export and export

[markkaganovsky]

Excellent tutorial!
Thank you for putting this together.

[bilalsaheli]

This makes easy to understand, Thanks mate

[jebssan]

Thanks a lot for putting this together!

[watermanli]

Really amazing tutorial... demystified

[ano-xc]

Thanks, can you please share the link of the written blog you are using for explanation

[LifeOfSoftwareEngineer]

How yang revisions are supported by yang libraries. AFAIK it is done by maintaining different file for each revision per module such as <module>@<revision-date>.yang files. Any other information I can read about the same?

[jamalawyonis]

yang2dsdl only works with pyang version 1 but not version 2..even if i change to version 1 i am having a problem running the code. Is there another way to to validate the models?

[jackr]

Hi ultra config,

Can you please help me with this?

I want the pattern in leaf to take only 2 strings as input.
The strings are
["IPv4"]
["IPv6"]
Along with the square brackets and quotations. If the address mentioned is ipv4 then they also should mention that they mentioned ipv4 as ["IPv4"] and for ipv6 also the same.
So the pattern for this given is
'((["IPv4"] | ["IPv6"]))' ;
But this didn't work
Also tried
'(([\"IPv4\"] | [\"IPv6\"]))' ; this one is working but it is also taking all kinds of strings which is not the requirement so can you help in getting only ["IPv4"] and ["IPv6"]


Thank you

[derka]

hi. can i omit module-header in yang-module?

[MrChonch]

Can you pl give a tutorial of libyang also?

[oscarsalgado]

ok now i have a tree that is based on a cisco xe. How can we put the pieces together in order to form a valid URI that we can use for example at postman???

[Rodrigo_Bodhisava]

Ultra Config, how can I validate a yang file in windows or save as file.yang? Or which editor can recognize a yang file? Thanks

[zeenatsyed]

Is it possible to send iot sensor data using YANG or is only for network configuration?

[ultraconfig]

Hope you liked our video on YANG! Let me know what you think about the topic.

[abhisinghal]

any solution ?
yang-tutorial % yang2dsdl -v data.xml ultraconfig-interfaces.yang
warning: failed to load external entity
cannot parse
== Generating RELAX NG schema './-data.rng'
warning: failed to load external entity "schema-dir"
cannot parse schema-dir