Employing the Sdn Principle to Reduce the Link Failure Effect Efficiently in Conventional Ospf/ Mpls Routed Network

Abstract

The aim of this research is to sooth the effect of link failure in conventional Open Shortest Path First/ Multi-Protocol Label Switching (OSPF/ MPLS) routed network by enhancing the performance of the Fast Re-Route (FRR) mechanism and through adopting a methodology similar in many aspects to that used in Software Defined Networking (SDN). This methodology represented by using a central controller to calculate the paths of backup MPLS tunnels that used to protect previously established primary MPLS tunnels in addition to messaging system to install the backup tunnels into the involved routers. The controller follows specific scenario to efficiently reserve the bandwidth of the backup tunnels by providing bandwidth sharing among the calculated backup tunnels as much as possible. The bandwidth sharing compares two cases of equal and unequal bandwidth values of primary (protected) tunnels. The routers are improved with scenario of periodically checking the validity of the backup tunnels after installation. Efficient bandwidth sharing provides better utilization of network resources as well as higher level of protection. Finally, our research shows three different cases of link failure along with successful restoration