Fast reroute with pre-established bypass tunnel in MPLS
Computer Communications
An on-line routing algorithm of locally protected paths with exact reservations
CSN '07 Proceedings of the Sixth IASTED International Conference on Communication Systems and Networks
PCE-based hierarchical segment restoration
IM'09 Proceedings of the 11th IFIP/IEEE international conference on Symposium on Integrated Network Management
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To provide dependable services MPLS networks make use of a set of procedures (detection, notification and fault recovery) which seek to ensure appropriate protection for the traffic carried in the LSPs. When a fault happens i n the active LSP, the recovery scheme must re-direct the traffic to a recovery path (the protection LSP or recovery LSP) which bypasses the fault. The two basic recovery models used to redirect traffic are rerouting and protection switching. Protection switching is faster than rerouting but cannot handle simultaneous faults in the active and the recovery path. On the other hand, rerouting is generally slow, and cannot offer QoS guaranties upon failure, but can use resources in a more efficient way. In this work we present a survey of several fault recovery schemes, firstly some approaches for protection switching will be reviewed and secondly the characteristics of some rerouting approaches will be discussed. For these schemes, we also allude to the extensions required by the signalling and traffic engineering routing protocols. Finally, the reviewed recovery mechanisms are classified according to a set of characteristics considered relevant.