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The allowed configurable range for the Priority of a virtual router is 1-254. 255 is reserved for a virtual router that is IP Address Owner (as described above). If two routers are participating in VRRP, making the desired Master router 254 (or 255 if IP Address Owner) and the Backup router 100 (the default Priority) is a common configuration. If multiple routers will be backing up the Master router, then the Priorities can be assigned in descending order (100, 99, 98, etc., for example).
Equal Priorities are also allowed but may be more difficult to troubleshoot. If two Master routers have the same Priority (and the same VRRP settings), the VRRP election process then checks the associated IP Address of each virtual router. In that case, the associated IP Address with a higher value becomes Master. However, if a Master and Backup virtual router have the same Priority, the Backup will not become Master even if it has a higher associated IP Address. In other words, equal priorities are not enough for a backup router that is already in the Primary state to become Backup.
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