(This project has been tested with RYU version 4.2)

This project is an attempt to implement the MM-SRLG algorithm presented in the paper "Restorable Logical Topology in the Face of No or Partial Traffic Demand Knowledge" by Prof. Reuven Cohen and Dr. Gabi Nakibly.

There are two main components:

1. An implementation of a remote controller application, either:

• based on the MM-SRLG algorithm.
• based on a customized algorithm that uses disjoint paths to find routes between logical nodes.

2. A Mininet topology initializer, which receives a network description file and starts up the network in Mininet. The remote controller application also needs this file for the initialization phase.

Network description file:

Using Python, you will need to define a dictionary with 5 key-value pairs and then serialize it into a file using the pickle module:

1. 'V_P': a list of optical swithces (physical nodes).
2. 'V_L': a sublist of V_P that can serve as routers (logical nodes).
3. 'E_P': a list of optical links (physical edges).
4. 'B': an integer representing the budget of the network. The budget is the maximum number of logical links allowed.
5. 'C_P': an integer representing the capacity of each link in the network. It must be even and greater or equal to 2.

See examples in the directory network_generators.

Starting up the controller:

In order for this step to work, you will first need to update the file ryu/ryu/flags.py (found in Ryu's directory) so you can pass the network description file as an argument to the controller application. Simply add the following line at the end of the file:

CONF.register_cli_opts([cfg.StrOpt('network-file', help='file describing network components')], group='project')

Now run the following command from Ryu's main directory (modify the paths in the command accordingly):

PYTHONPATH=. ./bin/ryu-manager ../restorable_topology/remote_controller_apps/MM_SRLG_Controller.py --project-network-file ../restorable_topology/test_results/grid/grid1.p --observe-links

Starting Mininet:

First, you will need to edit the file restorable_topology/src/mininet/customTopologyInitializerTest.py. The instantiation of the object CustomTopologyInitializer receives a string representing a path to a file. Here you need to type the path to the network description file, the same file that was given to the "--project-network-file" switch in the command above.

Then run the following command:

mn --custom restorable_topology/src/mininet/customTopologyInitializerTest.py --topo customTopology --controller=remote --switch ovsk --mac --arp

Starting a bandwith test:

Now you will need to edit the file restorable_topology/src/mininet/bandwidthTest.py, in the same manner described before. Then run the following command:

mn --custom restorable_topology/src/mininet/bandwidthTest.py