Fortinet MR1 - Manual (Page 507)

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Configuring Spanning Tree MST Configuration Page
Selection Criteria
MST ID - Create a new MST which you wish to configure or configure already existing MSTs.
Configurable Data
MST ID - This is only visible when the select option of the MST ID select box is selected. The ID of the
MST being created. Valid values for this are between 1 and 4054.
Priority - The bridge priority for the MST instance selected. The bridge priority is set in multiples of 4096.
For example if you attempt to set the priority to any value between 0 and 4095, it will be set to 0. If you
attempt to set any value between 4096 and (2*4096-1) it will be set to 4096 and so on.
VLAN ID - This gives a list box of all VLANs on the switch. The VLANs associated with the MST instance
which is selected are highlighted on the list. These can be selected or unselected for re-configuring the
association of VLANs to MST instances.
Non-Configurable Data
Bridge identifier - The bridge identifier for the selected MST instance. It is made up using the bridge
priority and the base MAC address of the bridge.
Time since topology change - The time in seconds since the topology of the selected MST instance
last changed.
Topology change count - Number of times the topology has changed for the selected MST instance.