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SOFTWARE DEFINED NETWORKING: PYTHON PROGRAMMABILITY AND EVENT MANAGERDecember, 2015

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1. Python Programmability and Event Manager Intro2. Scenario and Demo3. Key Takeaways

AGENDA

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WHAT ARE WE GOING TO TALK ABOUT?NEW FEATURES IN AOS 7.3.4

DESCRIPTIONEvent-Action Triggers execution of a python program when the specified trap occursPython Interpreter

Enables execution of Python programs

RESTful API (Since 7.3.2)

Web Services management interface to access the MIB as well as CLI in JSON or XML formats.

SOFTWARE-DEFINED RESPONSE TO NETWORK EVENTS

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INTERNAL PYTHON

• Internal Python program under AOS on the OmniSwitch• Three ways to execute Python­ Automatically, as an AOS “event-action” when a TRAP occurs­ Interactively, from the AOS console­ In a file executed by command from the AOS console• AOS Python includes standard Python 3 packages for OS access and issuing AOS

commands

Customer-written Python program

Python 3 interpreter and standard Python packages are built into AOS

AOS 7.3.4Python script running

on OmniSwitch

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EXTERNAL PYTHONTHROUGH RESTFUL API• External Python scripts run on a PC external to the OmniSwitch­ Requires python2 or python3 interpreter on PC/Linux/Mac. Easy to install from python.org.­ Python script on PC connects to AOS using HTTP/HTTPS and the AOS RESTful APIs.­ Sample Python code and libraries are available to demonstrate access to MIB variables in

one or more AOS 7.3.4 switches.­ Sample library returns results in an easy-to-handle Python “dictionary” object

Python scriptrunning on PC/Linux/Mac AOS 7.3.4

MIB variables accessible via Web

Services

Web Services via HTTP/HTTPS

Customer-written Python program

Sample AOS REST library

Python 2 or Python 3 interpreter/PyPi packages

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INTERNAL + EXTERNAL

• Combine internal python scripts with external RESTful API• A python script can execute on the local switch and on the remote switch through

the RESTful API• Can execute interactively from console, from a file or when a TRAP occurs.

Customer-written Python programPython 3 interpreter and standard Python packages are built into AOS

AOS 7.3.4Python script running

on OmniSwitch (Client)

RESTFul API (Server)

RESTFul API (Server)

AOS 7.3.4Python script running

on OmniSwitch (Client)Sample AOS REST library

Customer-written Python programPython 3 interpreter and standard Python packages are built into AOS

Sample AOS REST library

Web Services via HTTP/HTTPS

Web Services via HTTP/HTTPS

SCENARIO AND DEMO

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DEMO SCENARIO

• The Microwave link provides high bandwidth at low cost however is susceptible to fading etc in bad weather.• The Telco link provides moderate

bandwidth and high quality but the cost is high.• In normal circumstances, Internet traffic

will use the Microwave link whilst Corporate traffic including VOIP will use the Telco link.• But when the quality of the Microwave

link degrades, a Python App will divert Internet traffic to the Telco link and set a 1Mbps bandwidth cap.• Internet traffic will automatically revert to

using the Microwave link when the quality becomes acceptable.

Central Site

Corporate Traffic

Internet Traffic

Remote Site

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ACTUAL SETUP

16900-T20

2

1 2

EMP (10.244.1.2)

6400 Port 10, VLAN

1244 (10.244.1.3)

10.244.1.0/24

HTTP

S

10.244.1.201

dmz33-rdpgw.al-mydemo.com

RDP

RDP

192.168.20.1

192.168.20.2

192.168.30.1

192.168.30.2

Lo0 192.168.10.1

Lo0 192.168.40.1

TelcoLink

Microwave Link

Remote Site

CentralSite

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DEMO SCENARIOCONFIGURATIONMeasuring Link Quality with SAA IP Ping (100 pings every minute)! SAA:saa "linktest" interval 1saa "linktest" type ip-ping destination-ip 192.168.30.2 source-ip 192.168.30.1 type-of-service 5 inter-pkt-delay 100 num-pkts 100saa "linktest" startTriggering Python Application after test is completed! Trap Manager:snmp-trap absorption disableevent-action trap alaSaaIPIterationCompleteTrap script /flash/python/linkquality.py

QOS Policies! QOS:policy condition Internet destination ip 192.168.40.1 #This IP address represents an Internet IP addresspolicy action UseTelcoLinkAndRateLimit maximum bandwidth 1.00M permanent gateway-ip 192.168.20.2 policy action UseMicrowaveLink permanent gateway-ip 192.168.30.2 policy rule InternetViaMicrowave condition Internet action UseMicrowaveLink policy rule InternetViaTelco disable condition Internet action UseTelcoLinkAndRateLimit #This rule is normally disabledqos apply

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DEMO SCENARIOPYTHON LOGIC

Packet Loss

Microwave Link in

Use?Disable InternetViaMicrowave ruleEnable InternetViaTelco rule

Do nothing and exit

Microwave Link in

Use?Disable InternetViaTelco ruleEnable InternetViaMicrowave rule

> 10 %

5 % to 10 % (hysteresis to avoid toggling)

< 5 %

Yes

Yes

No

No

linkquality.py

KEY TAKEAWAYS

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Embedded software-defined response to network events

Minimize disruption with nearly real-time reaction No dependence on NMS or SDN controller availability or reachability

Infinite possibilities

PYTHON PROGRAMMABILITY AND EVENT MANAGERKEY TAKEAWAYS

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v

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