In DCN, congestion occurs in only up to a few seconds. This congestion can be alleviated if optimal routing is used. However, existing traffic engineering technique fail to provide any of the following:

• Utilize multipath diversity
• Use a global view to make routing decisions

This paper propose to monitor traffic at NICs and couple with OpenFlow to do MicroTE. The architecture is as follows:

• Top-of-rack switch or end-hosts monitor traffic and gather statistics.
• Controller collect statistics, either by polling switches regularly or end-hosts feed data to controllers
• Controller compile the global view of network and send to routing component
• Routing component computes route
• If new route is different from current one significantly, new route is used, though OpenFlow update.

## Bibliographic data

@inproceedings{
title = "The Case for Fine-grained Traffic Engineering in Data-centers",
author = "Theophilus Benson and Ashok Anand and Aditya Akella and Ming Zhang",
booktitle = "Proc INM/WREN",
month = "Apr",
year = "2010",
}