Fat Tree DCN

The Fat Tree DCN section as written seems to conflate fat-trees and Clos networks. While they're often very similar, fat tree seems to be a term reserved more for networks that are less interconnected than Clos networks: because fat trees are more hierarchical, they have a much higher tendency to be oversubscribed than a more densely connected Clos network that has more paths to distribute bandwidth over. Cleaning up this paragraph may also require describing strict hierarchical fat-tree networks and strict Clos networks and then mention that any network can waver between the two extremes (weighing build-cost against available bandwidth) by increasing or decreasing the number of connections from the root out to the lower levels.

Compare Al-Fares vs Greenberg:

- https://www.cs.kent.edu/~javed/class-CXNET09S/papers-CXNET-2009/FaLV08-DataCenter-interconnect-p63-alfares.pdf

- https://www.microsoft.com/en-us/research/wp-content/uploads/2016/02/vl2-sigcomm09-final.pdf

- 131.93.209.233 (talk) 02:45, 8 August 2020 (UTC)[reply]