Abstract

In this paper we present a comparative study of two schemes to provide survivability for guaranteed QoS connections in a possible Next Generation Internet network architecture. In the ®rst scheme a QoS connection is provided standby backup resources on a dis- joint path by reserving resources on both the working and backup path. In order to reduce the amount of backup resources required a method for sharing backup resources when the working connections have dis- joint routes has been included. In the second scheme a dynamic search for restoration resources is conducted over a preplanned set of alternate paths upon noti®cation of a failure. A simulation based performance study shows that the ®rst scheme results in much higher connection blocking under normal operations, slightly faster restoration times, and longer transient congestion times after fault recovery due to non-optimal backup routing.

To obtain a PDF file of this paper for viewing with Acrobat Reader, click here.