Supermicro SSE-F3548S - 6.9 Configuring the Root Switch (or) Priority

Supermicro SSE-F3548S/SSE-F3548SR Configuration User’s Guide
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The examples below show various ways to configure the spanning tree compatibility.
Configure the spanning tree compatibility as STP.
SMIS# configure terminal
SMIS(config)# spanning-tree compatibility stp
SMIS(config)# end
Configure the spanning tree compatibility as RSTP.
SMIS# configure terminal
SMIS(config)# spanning-tree compatibility rst
SMIS(config)# end
6.9 Configuring the Root Switch (or) Priority
The switch with the lowest priority value gets elected as the root switch. To make any particular switch
the root switch, configure it with a lower numeric priority value. The default spanning tree priority is
32768.
When priorities of all switches are the same, the switch with the lowest MAC address gets elected as the
root switch.
Follow the steps below to change spanning tree priority.
Step
Command
Description
Step 1
configure terminal
Enters the configuration mode
Step 2
To configure the switch priority in RST mode:
spanning-tree priority <priority-value>
To configure the switch priority for the default MST
instance 0:
spanning-tree priority <priority-value>
To configure the switch priority for particular MST
instance:
spanning-tree mst <instance-id> priority <priority-
value>
Configures the switch spanning tree
priority.
priority-value – Spanning tree switch
priority value in multiples of 4096 from
0 to 61440. In other words only the
following priority values are valid.
0
4096
8192
12288
16384
20480
24576
28672
32768
36864
40960
45056
49152
53248
57344
61440
The default priority value is 32768.
instance-id – The MST instance
identifier may be from 1 to 16.
Step 3
end
Exits the configuration mode.
Step 4
show spanning-tree bridge priority
show spanning-tree
Displays the spanning tree
configuration parameters including the
switch priority values.