OSPF DR/BDR Election
The assigned priority can be between 0 and 255. A priority of 0 guarantees that the router never wins a designated router (DR) election, and 255 guarantees a tie in the election (tie broken by highest router ID). If all routers have the same priority, regardless of the number, they tie. Ties are broken by the highest router ID. Since 255 is the highest possible priority, a router with a priority of 255 is merely guaranteed to be part of a tie-breaker, and will not lose due to higher priority.