A New ISP/DC Network Architecture for Fast Failure Recovery

Abstract

BGP routes are increasing day by day and their number was reported to be over 700 thousands in March, 2017. Processing too many routes consumes a lot of CPU time of routers, therefore the routers spend a long time changing routes when a failure occurs. In this paper, we analyze reasons for spending the long time changing routes originating in BGP specification. We propose an ISP/DC network architecture that enables to shorten the time changing BGP routes and its implementation using OpenFlow. We propose a fast switch method for huge number of flows. We evaluate the implementation and show that our method can reroute a million flows of Japanese nationwide network with less than 100 millisecond.