S5#sh run | b span
spanning-tree mode mst
spanning-tree extend system-id
!
spanning-tree mst configuration
 name ProbA
 instance 1 vlan 10
!
spanning-tree mst 1 priority 0
!



S6#sh run | b span
spanning-tree mode mst
spanning-tree extend system-id
!
spanning-tree mst configuration
 name ProbA
 instance 1 vlan 10
!
spanning-tree mst 0 priority 0
!




S6#sh spanning-tree

MST0
  Spanning tree enabled protocol mstp
  Root ID    Priority    0
             Address     0013.80e2.0280
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    0      (priority 0 sys-id-ext 0)
             Address     0013.80e2.0280
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

Interface        Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/2            Desg FWD 200000    128.2    Edge P2p
Fa0/4            Desg FWD 200000    128.4    Edge P2p
Fa0/24           Desg FWD 200000    128.24   P2p


MST1
  Spanning tree enabled protocol mstp
  Root ID    Priority    1
             Address     0014.a859.cc00
             Cost        200000
             Port        24 (FastEthernet0/24)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     0013.80e2.0280
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

Interface        Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/24           Root FWD 200000    128.24   P2p

S6#sh span
S6#sh spanning-tree summ
Switch is in mst mode (IEEE Standard)
Root bridge for: MST0
Extended system ID           is enabled
Portfast Default             is disabled
PortFast BPDU Guard Default  is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default            is disabled
EtherChannel misconfig guard is enabled
UplinkFast                   is disabled
BackboneFast                 is disabled
Configured Pathcost method used is short (Operational value is long)

Name                   Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
MST0                         0         0        0          3          3
MST1                         0         0        0          1          1
---------------------- -------- --------- -------- ---------- ----------
2 msts                       0         0        0          4          4
S6#sh spa mst con
Name      [ProbA]
Revision  0     Instances configured 2

Instance  Vlans mapped
--------  ---------------------------------------------------------------------
0         1-9,11-4094
1         10
-------------------------------------------------------------------------------
S6#