This section describes how a user may set up the packet optical use case, or by extension, a multi-layer network topology. One of the key drivers for this use case is that network designers can spin up a relatively large emulated packet-optical network on their personal computer.
The following diagram represents the full software stack that will emulate the packet/optical network environment. Mininet is the orchestration tool that will create all network switches, links, and hosts. The forwarding behavior of the switches is controlled by ONOS using the OpenFlow protocol. The packet switches are based on Open vSwitch and use OpenFlow 1.0, while the optical switches rely on LINC and use OpenFlow 1.3 (with vendor extensions as defined by the Optical Transport Working Group in ONF).
You should start with a fresh install of Ubuntu Server. Alternatively, you can start with the Mininet VM; this way you can skip the first step in following instructions.
- Install Mininet, for instance using the Native Installation from Source approach; this installs a lot of useful extra packages such as Wireshark and OpenFlow dissectors.
Install, configure and build LINC Switch: https://github.com/FlowForwarding/LINC-Switch
Install LINC-config-generator: https://github.com/FlowForwarding/LINC-config-generator
Clone ONOS and compile the oecfg application. This requires you have installed Java 8 and Apache Maven; go here for instructions on how to do that.
Instantiate Multi-Layer Topologies
Before spawning the packet/optical topology, you should ensure ONOS has loaded the optical application. You can do so by including
onos-app-optical in your Karaf features. You also want to make sure that you have
onos-app-proxyarp installed (alternatively, you can use
The ONOS source tree comes with two example scripts that create a multi-layer topology. These can be found in
onos/tools/test/topos/ and are called
First, make sure the
ONOS_ROOT environment variable is set. The easiest way is to set it in your cell definition, this way you'll also get
OCx environment variables that point to your ONOS instances. Then, to create spawn a large packet-optical topology, run the following command (note the
-E parameter passed to
sudo which preserves the environment variables):
In this example, three ONOS instances are running; feel free to change this to your setup. The script will ensure all switches (both packet and optical) will be configured to use the listed instances as their OpenFlow controller.
Both Mininet scripts rely on
opticalUtils.py, which has the following functionality:
If, for some reason, the script failed to inject the optical topology in ONOS, you can re-run this step as follows:
LINC Cheat Sheet
You can attach to the console of a running LINC instance as follows:
In the LINC console, the following commands are available.
|Get running config|
|Get DPID of logical switch|
|Stop logical switch|
|List ports on logical switch|
|Get flow table of logical switch (use tableId 0)|