This Design is Flawed (Score 3, Informative)

Routing/Switching based on flows is highly flawed. The article claims that the benefit is due to reduced table lookup based on individual packet content. Instead if the 5 tuple is hashed to a flowid. then the presence of flowid indicates that the flow is already active and will be treated preferentially during a congestion. First of all, if the number of flowids are large then there is no way to store all the different flowids in a scalable and cost effective manner. Which means you associate an eviction clause which can hurt you more with all these complexities. Secondly, there is concept of hardware caching which works better than hashing flowids. Finally, all the classes of flow which are really important, can be protected with class based queuing.