Google LLC Google LLC RFC4090 documents facility backup FRR in MPLS-TE networks. This document describes methods that allow the Point of Local Repair (PLR) to find a path with sufficient available bandwidth to accommodate protected traffic, while not making undesired reservations that would require additional capacity. Below aspects are covered: * Automatic determination of bypass required bandwidth by the PLR * Calculation of path based on this information using constrained shortest path algorithm (CSPF) * Determination of RSVP SENDER-TSPEC rate value for bypass tunnel signaling