A fault-tolerant routing model for unicast flows in MPLS-network is proposed. The flow-oriented model is represented by algebraic equations and inequalities characterizing the state of MPLS-network, i.e. load of its communication links. The proposed model includes the possibility to implement three basic backup schemes in accordance with the concept of Fast ReRoute: link, node and path protection. The model describes also three different types of condition of the links overload prevention for different variants of channel resource use. The above example demonstrates the advantages of using the proposed conditions of the links overload prevention in paper.
Lemeshko O., Arous K. Fast ReRoute Model for Different Backup Schemes in MPLS-Network // Proceedings of First International IEEE Conference «Problems of Infocommunications. Science and Technology» (PICS&T-2014). – Kharkiv, Ukraine: 14-17 October, 2014. – PP. 39-41.

Design of schemes for MPLS Fast ReRoute is proposed in the paper. The scheme allows for the same flow calculate two types of paths: primary and backup. Depending on the parameters of the scheme it is possible to implement different schemes of reservation: link, node or path protection. In the course of solving the problem of MPLS Fast Reroute the classical metric of primary and backup paths is minimized. The nonlinear restrictions, which are responsible for prevention of node, link or path intersection of primary and backup routes is introduced in the structure of the scheme.
Lemeshko O., Romanyuk A., Kozlova H. Design schemes for MPLS Fast ReRoute // XIIth International Conference THE EXPERIENCE OF DESIGNING AND APPLICATION OF CAD SYSTEMS IN MICROELECTRONICS, Polyana-Svalyava-(Zakarpattya), UKRAINE 19-23 February, 2013. – P. 202-203.