Multiple Fault Tolerance in Mpls Network Using Open Source Network Simulator

Multiprotocol Label Switching (MPLS) is a label based switching technique initiated by Internet Engineering Task Force to bring the speed of layer 2 switching to layer 3. Its label based switching technique allows routers to make the forwarding decision based on the contents of label instead of performing a complex route lookup table. Furthermore it allows explicit routing to overcome links and nodes failure in the network. For fault recovery multiprotocol label switching has two domains called Protection Switching and Rerouting. Explicit routing, in it the alternative paths are pre-established through MPLS core router (ingress node). We developed new protocol using explicit routing for multiple fault tolerance in the network. We simulate it in an open source network simulator ns2 and compare it with rerouting fault recovery protocol in NS that belongs to rerouting domain. The simulation shows that the proposed protection switching fault recovery protocol performed better in fault recovery time as compare to rerouting fault recovery protocol.