Licensing Requirements and Limitations for MPLS TE

Traffic engineering fast reroute (TE FRR) requires reserved bandwidth for a bypass tunnel that needs to be pre-established. If available bandwidth is insufficient, FRR protects only important nodes or links along a tunnel.

Dynamic TE tunnels using bandwidth reserved in Shared Explicit (SE) style support TE FRR, but static TE tunnels do not.

BFD for LSP can function properly though the forward path is an LSP and the backward path is an IP link. The forward path and the backward path must be established over the same link; otherwise, if a fault occurs, BFD cannot identify the faulty path. Before deploying BFD, ensure that the forward and backward paths are over the same link so that BFD can correctly identify the faulty path.