Conversation so far:
What are scalable data center network architectures?
DCNs need to be scalable and efficient to connect tens or even hundreds of thousands of servers to handle the growing demands of Cloud computing.
What are some examples of scalable data center network architectures?
1 Three-tier DCN 2 Fat tree DCN 3 DCell
Describe the characteristics of FAT tree topology.
In a fat tree, branches nearer the top of the hierarchy are fatter (thicker) than branches further down the hierarchy. In a telecommunications network, the branches are data links; the varied thickness (bandwidth) of the data links allows for more efficient and technology-specific use.
What routes can be taken by an upstream packet?
The router is upstream of the computer, connecting the computer to the whole internet. ... Each router does not need to know the whole route to the destination;
Describe core, aggregator and edge switches.
In small networks of a few hundred users, edge switches can be connected redundantly directly to core switch/router devices. However, for larger networks, , an additional layer of switching, called the distribution layer, aggregates the edge switches.
Are flows bidirectional?

Question: How many forwarding rules are there in each layer of the tree?
Self-contained rewrite: How many forwarding rules are there in each layer of the FAT tree topology?