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In order to provide reliable services MPLS network uses set of procedures (fault detection, fault notification and fault recovery) which provide appropriate protection to the traffic carried in active LSP (Label Switching Path). When fault occur in active LSP, the recovery scheme must re-direct the affected traffic to the recovery path which bypass the fault. The two basic recovery mechanism defined by IETF used to re-direct affected traffic is rerouting and protection switching. In protection switching number of faults can be handled simultaneously in the active and recovery path and is faster as compared to rerouting switching.
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