Implement Clos topology in Distrinet

[cj-chung]

Goal: Implement Clos topology in Distrinet to mimic a physical network topology in a modern data center.

Clos topology

Clos topology in Distrinet

[jiawei96-liu]

In leaf-spine architecture, every lower-tier switch (leaf layer) is connected to each of the top-tier switches (spine layer) in a full-mesh topology.
https://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white-paper-c11-737022.html#Spineandleafarchitecture

[jiawei96-liu]

For multi-layer leaf-spine architecture, a reference example is SONIC topology from Microsoft.

https://azure.github.io/SONiC/
https://www.sdnlab.com/20309.html

[jiawei96-liu]

After comprehensive consideration, the current custom topology is as follows：