An efficient algorithm to create a loop free backup routing table

Traditional routing protocols schemes allow traffic to pass via the single shortest path. Pre-computing an alternative aims to route the traffic through it when the primary path goes down. A new algorithm schema has been proposed in this paper to find an alternative and disjoint path with primary one by creating a new backup routing table based on adjacent nodes for each node connected with the primary one. The results showing that loss packets, reroute and end to end delay times have been improved between source and destination with avoid loops on the network. The result obtained showed that new schema does not degrade from the network performance by sending additional messages to create a new backup routing table. The Simulation results (using NS2 simulator) show a comparison between existing link state protocol and the proposed algorithm.