This object is a read-write boolean controlling BackboneFast, which detects indirect link failures in the backbone by recognizing when a switch receives an inferior BPDU from another switch's designated port, and then actively searches for an alternate path to the root. Administrators enable it in core/backbone topologies to speed convergence for failures that aren't directly attached to the local switch. For example, enabling stpOptfBackboneFast lets a distribution switch detect that a peer switch lost its path to the root and re-converge faster than waiting out the max-age timer.