The value of vRtrRsvpGenPreemptionTimer specifies the time a
node holds on to a reservation for which it has triggered the
soft preemption procedure. The preempting node starts a preemption
timer for each preempted LSP path. While this timer is on, the
node continues to refresh the Path and Resv for the preempted
LSP path. When the timer expires, the node tears down the LSP
path if the head-end node has not already done so.
A value of 0 means that the node does not hold on to the reservation
at all.