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STP/RSTP

getting info

show spanning-tree vlan 28

RSTP

show spanning-tree summary
enable
config
spanning-tree mode ?
spanning-tree mode rapid-pvst

spanning-tree vlan 1 priority 57344
spanning-tree vlan 2 priority 57344
spanning-tree vlan 28 priority 57344
spanning-tree vlan 255 priority 57344
end
show spanning-tree bridge
wr

Disable STP: 

enable
config terminal
Switch(config)#no spanning-tree vlan 1
wr
copy run star

Enable STP trunk on one port: 

interface GigabitEthernet1/1
no switchport nonegotiate
switchport mode dynamic auto
end