Tutorial 2: Connect Nodes with Time-Sliced Topologies

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Tutorial 2: Connect Nodes with Time-Sliced Topologies#

In optical DCNs, topologies are determined by the internal connections of optical circuit switches (OCS).

As in the following figure:

Architecture

With OpenOptics, you can define a topology schedule that specifies how electrical nodes (e.g., ToRs in the figure) connect to each other over time. This schedule will be executed repeatedly, one after another.

The primitive API is:

connect(time_slice, node1, node2)

This primitive API lets you add an entry to the topology schedule to connect node1 and node2 in the given time slice.

Your Tasks#

You will:

  1. Use the connect() API to create a 4-node topology schedule,

  2. Ensure the following:

    • In each time slice, each node connects to exactly one other node (i.e. each node has one link)

    • Across all time slices, every node connects to every other node exactly once.

This schedule guarantees that, over a period of time, each node can directly communicate with all other nodes.

You will implement your solution in openoptics/tutorial/2-connect.py. Run the script to generate and visualize your topology schedule on the dashboard:

python3 2-connect.py
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