Junos Automation Stack

 

• Processes required for automating junos devices are mgd(management process) and jsd(jet service processes)
• mgd handles automation requests invloving junox XML APi, Yang, Rest API
• jsd handles automation requuests involving Juniper Extension Toolkit(JET) API.

Junos has rich set of API - XML API(using NETCONF protocol) , REST API, JET API.

XML API:

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junos xml api uses netconf protocol for off box automation

netconf is a open standard and uses xml to transmit documents

it provides mechanisms to install, manipulate and delete config of network devices using 

xml and rpc calls

On Box scripting:

XSLT - standard language for processing xml data

SLAX - to convert alternate syntax to xslt

python - using pyez libraries

Types of scripts:

Commit scripts.

Op scripts

Event scripts

snmp scripts

NETCONF:

- uses SSH

- messages formatted in xml and yang

Uses below libraries to make life easier

- Ruby, Python, Perl, Java

Juniper PYEZ(Python libraries):

- automatically parses XML outpurs

- file system utilities

- converts xml into python objects

- takes care of parsing all XML RPC outputs

REST API:

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locates transfer and manipulate data managed by API server

Uses HTTP for transport(using get and post) method

netconf and ssh not necessary

GUI app explorer

JET API:

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Enables 3rd party apps to run on junos

program junos control plane

uses GRPC instead of netconf

uses JSD process

faster commit times and improve device telemetry and wider range of possible languages available for automation

Uses below:

   GRPC for cross language services to enabled request response service

   for event notification uses MQTT(Message Queue Telemetry Transport) Protocol. Implementted using Mosquitto notification broker.

   Uses Ephemeral DB for fast programming config features. Validates syntax but not semantics. User has to be careful while using epheremal DB

   

   

JSNAPY:

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Take snapshots and compare snapshots

NETCONF:

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Messages layer:

* RPC 

* RPC-REPLY

* Notification: One way message