Introduction to NetConf & Yang

1. Abstract Configuration
with NETCONF/YANG
Rabu, 25 April 2018
Lab Telematika
Sekolah Teknik Elektro dan Informatika
Institut Teknologi Bandung
Labtek 8 Lantai 4
4/25/2018

2. SDN Types
4/25/2018

3. Hybrid SDN
• NETCONF.
• Abstract the configuration of devices.
• Using YANG Data Model.
4/25/2018

4. NETCONF
NETCONF is a IETF network management protocol designed specifically for
configuration management
• Makes a distinction between configuration and state data.
• Utilized multiple configuration data stores (candidate, running, startup).
• Configuration change transcations.
• Provides client side configuration validation.
• Uses a client-server model and SSH as transport protocol
4/25/2018

5. NETCONF
4/25/2018

6. YANG
4/25/2018
• YANG is a modeling language defined
in RFC 6020.
• Models files are self-documented and
ship with devices
• The goal is to be able to formally model
any network device configuration.
• YANG data models is create by IETF or
OpenConfig and mapped to native
models in each vendors.

7. YANG
4/25/2018
Main node types :
• Leaf – node with name and value of
certain type (no children)
• Leaf list – sequence of leafs
• Container – groups nodes and has no
value
• List – Sequence of records with key leafs

8. NETCONF & YANG
DEMO on CSR1000V
4/25/2018

9. Demo Topology
4/25/2018

10. Step Demo
4/25/2018
• Enable NETCONF/YANG in CSR1000v
• Get YANG capabilities from CSR1000v
• Get YANG data model from CSR1000v
• Convert YANG data model to python modules
• Create python program to generate JSON files
configuration from modules
• Convert JSON to XML
• Send XML to CSR1000v
• Python Script : http://bit.ly/NETCONF-YANG

11. Client
# sudo apt install python-pip
# sudo pip install ncclient pyang pyangbind ipython
4/25/2018

12. Enable NETCONF/YANG
router(config)# username btech
privilege 15 password btech
router(config)# netconf-yang
4/25/2018

13. Get YANG capabilities
#ptyhon 1.get_capabilities.py {ip-address} {netconf-port}
{username} {password}
4/25/2018

14. Get YANG models
#ptyhon 2.get_yang.py {ip-address} {netconf-port} {username}
{password} {yang-model}
4/25/2018

15. 4/25/2018

16. Convert YANG to Python Modules
# export PYBINDPLUGIN=`/usr/bin/env python -c 'import pyangbind; import os; print "%s/plugin" %os.path.dirname(pyangbind.__file__)'`
# echo $PYBINDPLUGIN
# pyang --plugindir $PYBINDPLUGIN -f pybind -o ietf_ip_binding.py ietf-ip.yang ietf-interfaces.yang ietf-inet-types.yang ietf-inet-types.yang
4/25/2018

17. Create python program
4/25/2018

18. 4/25/2018

19. Convert JSON to XML
# pyang -f jtox -o interface.jtox ietf-ip.yang ietf-interfaces.yang ietf-inet-types.yang ietf-yang-types.yang
# json2xml -t config -o interface.xml interface.jtox new_interface.json
4/25/2018

20. Send XML to Device
4/25/2018

21. t.me/zufardhiyaulhaq
zufar@btech.co.id
4/25/2018