MSTP Link cost Calculation

On a trial basis when we migrated from Rapid PVST+ to MSTP in a network of Cisco 3560G switches, we observed that all the link (FastEthernet) cost which by default is 19 have been increased to 200000. Any idea on what basis this link costs is calculated? Do MSTP use some different formula for link cost calculation.
Can anybody suggest any good MSTP migration guide?
Thanks in advance.

Hi! Francois,
Sorry for disturbing you once again. I was simulating the MSTP environment in my Lab ... I observed that whenever I map any new vlan to any existing instance the switch stops all communication in all vlans for few seconds. On debug I observed that all the instances are getting deleted and getting re-created. And by that process all the ports are going into disabled state. Is it becoz .... by adding additional vlan to an instance I am actually creating a separate MST region for this switch alone? But even then I am not able to understand what is the need for deleting all the instances?
I am attaching the log with this message, pls refer to the same.
Will be waiting for your comment.
Anybody else faced similar issue? Any related comments are appreciated.
SW-1(config-mst)#instance 2 vlan 15
SW-1(config-mst)#exit
SW-1(config)#
Jun 8 14:02:30.274 UTC: MSTP(2): Fa0/11 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MSTP(2): Fa0/13 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MSTP(2): Fa0/21 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MSTP(2): Fa0/23 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MSTP(2): Fa0/24 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MST(2): disabled
Jun 8 14:02:30.274 UTC: MST[2] Instance deleted
Jun 8 14:02:30.274 UTC: MSTP(1): Fa0/21 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MSTP(1): Fa0/23 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MSTP(1): Fa0/24 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MST(1): disabled
Jun 8 14:02:30.274 UTC: MST[1] Instance deleted
Jun 8 14:02:30.274 UTC: MSTP(0): Fa0/11 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MSTP(0): Fa0/13 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MSTP(0): Fa0/21 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MSTP(0): Fa0/23 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MSTP(0): Fa0/24 State change forwarding -> disabled
Jun 8 14:02:30.274 UTC: MST(0): disabled
Jun 8 14:02:30.274 UTC: MST[0] Instance deleted
Jun 8 14:02:31.280 UTC: MST(0): Initialization
Jun 8 14:02:31.280 UTC: MST(1): Initialization
Jun 8 14:02:31.280 UTC: MSTP: created IST port for 2307590
Jun 8 14:02:31.280 UTC: MSTP(0): Fa0/21 State change disabled -> blocking
Jun 8 14:02:31.280 UTC: MSTP(1): Fa0/21 State change disabled -> blocking
Jun 8 14:02:31.280 UTC: MSTP: created IST port for 230A860
Jun 8 14:02:31.280 UTC: MSTP(0): Fa0/23 State change disabled -> blocking
Jun 8 14:02:31.280 UTC: MSTP(1): Fa0/23 State change disabled -> blocking
Jun 8 14:02:31.280 UTC: MSTP: created IST port for 230C1C8
Jun 8 14:02:31.280 UTC: MSTP(0): Fa0/24 State change disabled -> blocking
Jun 8 14:02:31.280 UTC: MSTP(1): Fa0/24 State change disabled -> blocking
Jun 8 14:02:31.280 UTC: MST(2): Initialization
Jun 8 14:02:31.280 UTC: MSTP(2): Fa0/21 State change disabled -> blocking
Jun 8 14:02:31.280 UTC: MSTP(2): Fa0/23 State change disabled -> blocking
Jun 8 14:02:31.280 UTC: MSTP(2): Fa0/24 State change disabled -> blocking
Jun 8 14:02:31.297 UTC: MSTP: created IST port for 22F7550
Jun 8 14:02:31.297 UTC: MSTP(0): Fa0/11 State change disabled -> blocking
Jun 8 14:02:31.297 UTC: MSTP(0): Fa0/11 State change blocking -> forwarding
Jun 8 14:02:31.297 UTC: MSTP(2): Fa0/11 State change disabled -> blocking
Jun 8 14:02:31.297 UTC: MSTP(2): Fa0/11 State change blocking -> forwarding
Jun 8 14:02:31.297 UTC: MSTP: created IST port for 22FA820
Thanks & Regards,
Jyotirmay.

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