mrstpPriority 1.3.6.1.4.1.890.1.5.8.75.32.1.1.1.4

The value of the write-able portion of the Bridge ID, i.e., the first two octets of the (8 octet long) Bridge ID. The other (last) 6 octets of the Bridge ID are given by the value of dot1dBaseBridgeAddress.