Spanning-Tree Operation
802.1s Multiple Spanning Tree Protocol (MSTP)
Syntax: spanning-tree priority < 0 .. 15 >
This command sets the switch (bridge) priority for the
designated region in which the switch resides. The switch
compares this priority with the priorities of other switches in
the same region to determine the root switch for the region.
The lower the priority value, the higher the priority. (If there
is only one switch in the region, then that switch is the root
switch for the region.) The root bridge in a region provides the
path to connected regions for the traffic in VLANs assigned to
the region’s IST instance. (Traffic in VLANs assigned to a
numbered STP instance in a given region moves to other
regions through the root switch for that instance.)
The priority range for an MSTP switch is 0-61440. However,
this command specifies the priority as a multiplier (0 - 15 )
of 4096. That is, when you specify a priority value of 0 - 15,
the actual priority assigned to the switch is:
(priority-value) x 4096
For example, if you configure “2” as the priority on a given
MSTP switch, then the Switch Priority setting is 8,192.
Note: If multiple switches in the same MST region have the
same priority setting, then the switch with the lowest MAC
address becomes the root switch for that region.
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