topology

Topology discovery controller in Trema.

Prerequisites

• Ruby 2.0.0 or higher (RVM).
• Open vSwitch (apt-get install openvswitch-switch).
• Graphviz (apt-get install graphviz)

Install

$ git clone https://github.com/trema/topology.git
$ cd topology
$ bundle install --binstubs

Play

Run the controller topology_controller.rb with trema run by passing a topology configuration file with -c option, then it outputs the current topology information in ASCII format.

The triangle topology configuration with three switches:

$ ./bin/trema run ./lib/topology_controller.rb -c triangle.conf

The full mesh with 10 switches:

$ ./bin/trema run ./lib/topology_controller.rb -c fullmesh.conf

In another terminal, you can make changes to the current topology by adding or deleting switches with trema stop and trema start commands.

$ ./bin/trema stop 0x1
$ ./bin/trema start 0x1

To turn switch ports on/off,

$ ./bin/trema port_down --switch 0x1 --port 1
$ ./bin/trema port_up --switch 0x1 --port 1

To view the current topology graphically,

$ ./bin/trema run ./lib/topology_controller.rb -c fullmesh.conf -- graphviz /tmp/topology.png

To change the LLDP destination MAC,

$ ./bin/trema run ./lib/topology_controller.rb -c fullmesh.conf -- --destination_mac 11:22:33:44:55:66