Acquiring the YANG Model
  • 09 Aug 2024
  • 2 Minutes to read
  • Contributors
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Acquiring the YANG Model

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Article summary

The Yet Another Next Generation (YANG) models are stored on the device as part of the firmware package. In order to retrieve them the user must use a NETCONF tool, for instance:

  • SSH console
  • Tools from Cisco orchestrator (e.g.: Yang Explorer):
    https://github.com/CiscoDevNet/yang-explorer or Cisco YANG suite:
    https://github.com/CiscoDevNet/yangsuite
  • Tools from MG-Soft (e.g.: MG Soft NETCONF Browser)

Basic SSH Console NETCONF Tool

For the most basic NETCONF tool, SSH console, YANG models can be acquired by sending specific requests.


Note: Both NETCONF request and response are in XML format.

To send the proper requests:

  1. Connect Accedian NETCONF device by entering:
    ssh admin@10.230.111.130 -p 830 -s netconf

  2. Send HELLO message to device by entering:
    < ?xml version="1.0" encoding="UTF-8"? >
    < hello xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" >
    < capabilities >
    < capability >urn:ietf:params:netconf:base:1.0< /capability>
    < /capabilities >
    < /hello >
    ]]>]]>

  3. Send the request to acquire information regarding all available YANG schema by entering:
    < rpc message-id="101" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" >
    < get >
    < filter >
    < netconf-state xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring"
    < schemas/ >
    < /netconf-state >
    < /filter >
    < /get >
    < ]>]]>

  4. Send the request to acquire a specific YANG schema, for example “accedian-alarm” model, by entering:
    < rpc message-id="101" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" >
    < get-schema xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring" >
    < identifier >accedian-alarm< /identifier >
    < version >2017-12-15< /version >
    < format >yang< /format >
    < /get-schema >
    < /rpc >
    ]]>]]>

  5. Close the session by entering:
    < rpc message-id="101"
    xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" >< close-session/ >
    < /rpc >]]>]]>

Additional UI NETCONF Tools

For additional UI NETCONF tools (YANG Explorer, or MG Soft NETCONF browser), the Accedian device must be connected prior to running the corresponding built-in UI functions.

To acquire YANG models by using YANG Explorer:

  1. The overview information regarding all YANG schemas on the device can be listed as shown below:
    Skylight element LX v7.9_8.bmp

  2. The request can be sent in order to get a specific YANG file. Note that the RPC created automatically by YANG Explorer will not work. The request must be customized by removing the lines that read < get > and < filter >.
    Skylight element LX v7.9_9.bmp
    Skylight element LX v7.9_10.bmp

  3. YANG Explorer 0.8.0 (Beta) supports the functionality to download YANG files directly, but can be unstable.
    Skylight element LX v7.9_11.bmp

To acquire YANG models by using YANG Suite:

  1. Install Cisco YANG Suite: https://github.com/CiscoDevNet/yangsuite (Cisco YANG Suite document: https://developer.cisco.com/docs/yangsuite/ )

  2. Access Docker via WEB browser:
    a. Login: http://localhost:8480/
    Skylight element LX v7.9_12.bmp
    b. Create a new device profile and SSH session:
    Skylight element LX v7.9_13.bmp
    Skylight element LX v7.9_14.bmp
    c. Check the connection to profile created:
    Skylight element LX v7.9_15.bmp
    d. Create defualt Repository and YANG set from profile created:
    Skylight element LX v7.9_16.bmp
    e. Copy yand-files from: "/usr/share/yang"
    Skylight element LX v7.9_17.bmp


Note: Yang-files are stored in < yang-suite-data-dir >/ysdata/ users/< name > /repositories/< repo-name >. Example: /ysdata/users/admin/repositories/test-10-230-116-41-default-repo).

Skylight element LX v7.9_18.bmp

f. Select YANG set from YANG repository:

Skylight element LX v7.9_19.bmp

g. Load modules and explore YANG models
Skylight element LX v7.9_20.bmp
Skylight element LX v7.9_21.bmp

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