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MSTP config

hi
i read all theory about config MSTP in multi region but can't understand how to config it

for example i don't understand what this sentence mean:

The spanning tree that runs between regions is the CIST !!!
does it mean i should config between region Instance 0 for connectivity?

we have several switch in REGION 1
several switch in region 2
from each region : 1 switch connect to other region as i show in picture


and in each region we have some instance ( instance 1 -->vlan 10,20 & instance 2---->vlan 30,40)
 what is config of boundary port of R1(port:fa0/0 switch region 1 ) & R5 (port:fa0/1 switch region 2)
should i type command:

R1:

int fa0/0

spanning-tree mst 0 cost ...

R5:

int fa0/1

spanning-tree mst 0 cost...

OR

i should run another thing in each interface mode of boundary ports...?

mstp

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