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Multi-Point to Multi-Point Traffic Engineering (MP2MP-TE) leads to an important scalability in Multi Protocol Label Switching-Traffic Engineering (MPLS-TE) networks. This paper emphasizes on the support of Fast-reroute (FRR) in MPLS-TE networks by using MP2MP bypass TE-tunnels. Hence, one MP2MP bypass TE-tunnel can be used to protect several primary TE-tunnels. During failure, the primary TE-tunnel is encapsulated into the MP2MP bypass TE-tunnel which calls for defining a new type of MPLS hierarchy, i.e. the multipoint to multipoint hierarchy. In this paper we present a simulation study that evaluates several fast rerouting scenarios depending on the number of leaves of a MP2MP bypass TE-tunnel and on the number of primary TE-tunnels that can be encapsulated into one MP2MP bypass TE-tunnel. In particular, the scalability/bandwidth efficiency tradeoff between these schemes is analyzed and valuable comparisons with the existing approaches are presented.

Evaluation of Scalability and Bandwidth Efficiency of Multipoint to Multipoint Hierarchy for Fast Recovery in MPLS Networks