Alcatel-Lucent 7750 SR OS Configuration Manual page 247

Parameters
priority-level — The priority level adjustment value expressed as a decimal integer.
delta | explicit — Configures what effect the priority-level will have on the base priority value.
7750 SR OS Router Configuration Guide
Values
0 — 254
When delta is specified, the priority-level value is subtracted from the associated virtual router
instance's base priority when the event is set and no explicit events are set. The sum of the
priority event priority-level values on all set delta priority events are subtracted from the virtual
router base priority to derive the virtual router instance in-use priority value. If the delta priority
event is cleared, the priority-level is no longer used in the in-use priority calculation.
When explicit is specified, the priority-level value is used to override the base priority of the
virtual router instance if the priority event is set and no other explicit priority event is set with a
lower priority-level. The set explicit priority value with the lowest priority-level determines the
actual in-use protocol value for all virtual router instances associated with the policy.
Default
delta
Values
delta, explicit
VRRP
Page 247