This is the bridge port path cost. When a port is a non-trunk, the object's value is the same as dot1dStpPortPathCost in RFC 1493 for the port. When a port is operating as a VLAN trunk, the port may participate in multiple spanning trees, one for each VLAN. This port may use one of two path cost in each instance of spanning tree operating on the port. This object specifies one of two possible values that can be used by as a bridge port path cost for each instance of spanning tree operating on a trunk port. The alternate bridge port priority value is specified by swPortBridgePathCostAlternate. The value of this object must be greater or equal to the value of swPortBridgePathCostAlternate. The value of dot1dStpPortPathCost must be one of these two values.