Fortinet MR1 - Manual (Page 510)

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Configuring each Port MST Configuration Page
Selection Criteria
MST ID - Selects one MST instance from existing MST instances.
Slot/Port - Selects one of the physical or LAG interfaces associated with VLANs associated with the
selected MST instance.
Configurable Data
Port Priority - The priority for a particular port within the selected MST instance. The port priority is set in
multiples of 16. For example, if you set the priority to any value between 0 and 15, it will be set to 0. If it is
tried to be set to any value between 16 and (2*16-1) it will be set to 16 and so on.
Port Path Cost - Set the Path Cost to a new value for the specified port in the selected MST instance. It
takes a value in the range of 1 to 200000000.
Non-Configurable Data
Auto-calculate Port Path Cost - Displays whether the path cost is automatically calculated (Enabled) or
not (Disabled). Path cost will be calculated based on the link speed of the port if the configured value for
Port Path Cost is zero.