Question about STP Priority & Cost

Hi All,
I would like to know what kind of effect could occurs when changing the following on PVST layer 2 Switches:-
1- Vlan port Priority.
2- Vlan root cost.
Appreciate any feedback,
thank you,

STP decisions are based on the following in descending order:
1. Bridge ID - this is priority + MAC
2. Root Cost - added inwards
3. Sender bridge ID -
4. Port ID - the first 6 bits of which are priority.
For all of the above, lower values are better. Root Cost is second in the decision.
Thanks.

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