This document discusses abstracting device configurations using NETCONF and YANG. It provides an overview of NETCONF, which allows configuration management through transactions using candidate configurations. YANG is introduced as a data modeling language used to model device configurations. The document demonstrates configuring NETCONF/YANG on a Cisco CSR1000v router, getting capabilities and models, converting models to Python code to generate JSON configuration, and sending the configuration to the device via XML RPC calls.

1. Abstract Configuration
with NETCONF/YANG
Rabu, 25 April 2018
Lab Telematika
Sekolah Teknik Elektro dan Informatika
Institut Teknologi Bandung
Labtek 8 Lantai 4
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2. SDN Types
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3. Hybrid SDN
• NETCONF.
• Abstract the configuration of devices.
• Using YANG Data Model.
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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
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5. NETCONF
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6. YANG
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• 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
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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
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9. Demo Topology
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10. Step Demo
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• 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
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12. Enable NETCONF/YANG
router(config)# username btech
privilege 15 password btech
router(config)# netconf-yang
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13. Get YANG capabilities
#ptyhon 1.get_capabilities.py {ip-address} {netconf-port}
{username} {password}
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14. Get YANG models
#ptyhon 2.get_yang.py {ip-address} {netconf-port} {username}
{password} {yang-model}
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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
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17. Create python program
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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
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20. Send XML to Device
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21. t.me/zufardhiyaulhaq
zufar@btech.co.id
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