ryu_multipath

Multipath Transmission in SDN.

This repository using ryu controller implement multipath transminssion in SDN.
For implement multipath transmission, we need to modify Open vSwitch(OvS) and remake it.
The Changing includes select function in group table.
Setting buckets transmission method to implement multipath transmission.

Reference: https://github.com/saeenali/openvswitch/wiki/Stochastic-Switching-using-Open-vSwitch-in-Mininet

This repository provide ryu controller file and mininet topology to implement multipath transmission in SDN.
Before you try this repository, you need to install the environments. (ryu, mininet, openvswitch)

This repository will update transmission weights every 30 seconds.
If link is interrupted or switch is down, the transmission rule will be revised real time.

mininet shows:

Ryu Controller shows:

Environments

Ubuntu 14.04
OpenFlow v1.3
Open vSwitch 2.3.1
Ryu Controller 3.12
Mininet 2.2.1

Monitor Networks

This repository use sFlow to monitor network performance.
Using curl cmd to catch the parameter for multipath weights.
curl can catch network paramaters on the web by sFlow.
You can also use network monitoring tools(NetFlow, sFlow......) or LLDP Packet to monitor network performance.

The topology shows:

install Ryu Controller

Quickly Install

pip install ryu

installing from source code

git clone git://github.com/osrg/ryu.git
cd ryu; python ./setup.py install

Reference: https://ryu-sdn.org/

install Open vSwitch

choose the ovs version from here:
Reference: http://www.openvswitch.org//download/
modify group table transmission rule:
Reference: https://github.com/saeenali/openvswitch/wiki/Stochastic-Switching-using-Open-vSwitch-in-Mininet
build and install.

After finishing, you can use multipath transmisstion on ovs.

install Mininet

git clone git://github.com/mininet/mininet

cd mininet
git tag
git checkout -b 2.2.1 2.2.1
cd util
./install.sh -3nV 2.3.1

cmd "./install.sh -h" shows function of parameters.
this can customize the installation.

Mininet's version is 2.2.1.
Open vSwitch's version is 2.3.1.

Commands

When you installed environment, you can run the cmd to experiment.

on ryu controller:

sudo ryu-manager --observe-link multipath_controller_4_link_monitor.py

on mininet:

sudo mn --custom multipath_4_link_topo.py --topo mytopo --controller=remote