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When we connect two Layer 2 devices with each other there is a chance of loops and layer 2 loops called switching loops to avoid these loops we use Spanning-tree protocol.
We will use PVST (Per VLAN spanning-tree) in our scenario.
By default, spanning tree is configured on switches if we connect two switches spanning tree will start and automatically select which port have to block so the loops will not accrue.
Spanning tree take election on the basis of priority and higher priority will win by default priority is 32768 but if the priority is same then the election happen on the basis of the MAC address highest mac address will win.
