Fortinet MR1 - Manual (Page 177)

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This command sets the bridge priority for a specific multiple spanning tree instance. The
instance <mstid> is a number that corresponds to the desired existing multiple spanning tree
instance. The priority value is a number within a range of 0 to 61440 in increments of 4096.
If 0 (defined as the default CIST ID) is passed as the <mstid>, then this command sets the
Bridge Priority parameter to a new value for the common and internal spanning tree. The
bridge priority value again is a number within a range of 0 to 61440. The twelve least
significant bits will be masked according to the 802.1s specification.
This will cause the priority to be rounded down to the next lower valid priority.
Syntax
spanning-tree mst priority <0-4094> <0-61440>
no spanning-tree mst priority <0-4094>
<0-4094> - multiple spanning tree instance ID.
<0-61440> - priority value (Range: 0 – 61440).
no - This command sets the bridge priority for a specific multiple spanning tree instance to the default
value, that is, 32768. The instance <0-4094> is a number that corresponds to the desired existing
multiple spanning tree instance.
If 0 (defined as the default CIST ID) is passed as the <0-4094>, then this command sets the Bridge
Priority parameter for the common and internal spanning tree to the default value, that is, 32768.
Default Setting
32768
Command Mode
Global Config
This command adds an association between a multiple spanning tree instance and a VLAN.
The VLAN will no longer be associated with the common and internal spanning tree. The
instance <0-4094> is a number that corresponds to the desired existing multiple spanning
tree instance. The <1-3965> corresponds to an existing VLAN ID.
Syntax