The different preemption priorities are defined in the RSVP-TE protocol (Awduche, 2001). A higher priority LSP may preempt a lower priority LSP that is then re-routed though a new path as if it was setup after the higher priority LSP.
The setup priority value determines the level of capability of that LSP to preempt another and a holding priority value determines the level of capability of a LSP to resit to a preemption. Both values range from 0 (highest priority) to 7 (lowest priority).
D. Awduche, L. Berger, D. Gan, T. Li, V. Srinivasan, and G. Swallow, “RSVP-TE: Extensions to RSVP for LSP tunnels,” RFC 3209, December 2001.
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