A Review on Various Fast Reroute Schemes for Traffic Protection Mechanisms in MPLS

For a perfect network it must have ability to keep all the tasks and services running even when a link or node fails. This feature of any network is usually known as network resilience. The basic working of resilient network is that it can recover from a failure by automatically diverting the traffic from the failed portion of the network to another active part of the network. This process must be fast enough and the interruption of service due to the node failure is unnoticeable to the other part and as tiny as possible. This procedure is known as rerouting and the procedure with the help of which the path is calculated before a failure occurs is known as fast reroute. Now a days, Multi-protocol Label Switching (MPLS) has become main technology for Internet service providers. MPLS has features like ability to perform traffic engineering and providing Quality of Service. Multiprotocol Label Switching (MPLS) fast reroute (FRR) can be defined by various methods for example one-to-one or many-to-one backup. The term Fast Reroute is a shorthand way of describing the various MPLS traffic protection mechanisms. There are many schemes that have been proposed for fast reroutes in MPLS networks. In this paper various MPLS fast reroute schemes are surveyed which have been proposed till now. Keywords— MPLS, recovery, Multicast restoration, fast rerouting