Restoration routing in multi-protocol label switching (MPLS) networks

Summary form only given. MPLS Networks are known to provide flexibility of IP networks without compromising scalability. Guaranteed QoS in an MPLS network requires backup paths to be preset in the network. This tutorial introduces the single-layer restoration routing by placing primary as well as backup paths in MPLS networks. Our focus is on characterizing the fault models, computing and establishing backup paths, and bandwidth sharing along such backup paths. A quick overview of MPLS routing is provided followed by the routing information scenarios and the type of information propagated through routing protocols and their extensions. We also cover the information locally stored at MPLS nodes that assists in efficient restoration routing and the algorithms for computing backup paths using the local and propagated information.