RYU/SDN Simple Traffic Engineering (Cloud Homework 3)

- Requirements
  o. Construct a network  as below and restrict capacity of each link to 1Gbps.

Add flow entries to OVS

- There are sample codes in Ryu teaching us how to install a flow entries into an ovs. However, the samples are very simple that they only show the matching rules limiting input port and destination MAC address.

True/False Positive/Negative

What's the difference?
- True Positive
- True Negative
- False Positive
- False Negative

Ryu Controller - Traffic Monitor (Cont.)

- Try to block a flow if the traffic of that flow is abnormally large!

- A traffic monitor request switches info for every 5 seconds

RYU GUI Installation Problem

- Somebody reports that RYU GUI installation (http://dj184dja8.blogspot.tw/2016/04/ryu-installation.html) cannot work due to an import error as below:

Ryu Controller - Traffic Monitor

- Traffic monitor provides a periodically triggered inspector to obtain the flow/port status of each switches.
- A simple sample code is available here: https://github.com/osrg/ryu-book/blob/master/en/source/sources/simple_monitor.py 
- Note that it should be executed in Openflow 1.3

Ryu controller - deal with openflow packets notes

- Controller receives a  packet from a switch if the switch failed to look up it's flow table
- Get incoming packet message, src mac/ip, dst mac/ip, ofproto, ... whatever you want
- Learn a switch-port-mac_address entry