Description: The mplsFrrDBTable provides information about the fast reroute database. Each entry belongs to a protected interface, protecting backup tunnel and protected tunnel. MPLS interfaces defined on this node are protected by backup tunnels and are indicated by the index mplsFrrFacRouteProtIfIdx. If the interface index is set to 0, this indicates that the remaining indexes apply to all configured protected interfaces. The protecting tunnel is indicated by the second two indexes (mplsTunnelIndex and mplsTunnelInstance) and represents a valid mplsTunnelEntry. Note that the tunnel instance index of the protecting tunnel may be set to 0 which indicates the tunnel head interface for the protecting tunnel, as per RFC3812, but it may also be defined using the following semantics:

- lower 16 bits : protected tunnel instance - higher 16 bits: must be all zeros