The value of vRtrMplsLspFRMethod specifies the fast reroute
method used.
In the 'One-to-one Backup' method, a backup LSP is established
which will intersect the original LSP somewhere downstream
of the point of link or node failure. For each LSP that is
backed up, a separate backup LSP is established.
In the 'Facility Backup' method, instead of creating a separate
LSP for every LSP that is to be backed up, a single LSP is
created which serves as a backup for a set of LSPs. Such an LSP
tunnel is called a 'bypass tunnel'.