This object sets the RSVP-TE holding priority (0-7) for this dynamic tunnel once it's already established, distinct from its setup priority, as the description states. This determines how resistant the tunnel's own existing bandwidth reservation is to being preempted by a new, higher-setup-priority tunnel signaling later -- setting hold priority numerically better than setup priority is what implements graceful preemption avoidance for an already-up LSP. For example, a hold priority of 0 protects an already-established tunnel from ever being preempted once up, even by a newly signaled tunnel requesting the highest setup priority.