Setup S5 to be the root for VLAN10 and S6 as the root for all other VLANs. 
Use only standards based protocols for this tasks

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S5#sh run | b span
spanning-tree mode mst
spanning-tree extend system-id
!
spanning-tree mst configuration
 name CCIE
 revision 1
 instance 1 vlan 10
!
spanning-tree mst 1 priority 0
!
vlan internal allocation policy ascending
!
vlan access-map Prob12 10
 action drop
 match ip address 100
vlan access-map Prob12 20
 action forward
vlan filter Prob12 vlan-list 1-4094
!
!




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