Abstract: Multiprotocol Label Switching (MPLS) is switching network and provides significant benefits to the network by fast forwarding Internet Protocol (IP) packets. MPLS is scalable network and which provides end-to-end quality of service (QoS), also it enables efficient utilization of existing networks. MPLS is implemented in Mobile Ad-hoc Network (MANET) environment, then there is need to control over this network because the nodes in the network can be move at any point of time in MANET environment. If link failure occur in the network, then there is need to tolerate this failed link packet. For to tolerate this failed link use MPLS Fast Re-route (FRR) mechanism. The MPLS FRR mechanism based two types local and global. The local FRR mechanism which tolerate single link instead of path of network which is in global. The MPLS FRR mechanism is based on preplanned established link in the network. If link failures occur then packet of failed link is switch-over to the backup path that is created initially. In the proposed system, existing link or local based restoration with fast re-routing (FRR) mechanism for MPLS network is used and then analyses the problem such as packet loss, packet reordering, delay and overhead in the network after link failure. This FRR mechanism provides fast traffic recovery when a link failure occurs, MPLS-FRR uses link based local restoration mechanism for each failure. The main focus of the proposed work is to select optimal backup link with FRR mechanism and bellman ford algorithm during link failure. The FRR mechanism with bellman ford algorithm can reduce packet loss ratio and delay in the network and this can be simulated through network simulator version 3(ns3).

Keywords: MPLS, FRR, ns3, MANET, etc.