>> If you see the value of Root Bridge and Bridge ID to be the same for some switch, that will indicate that the current switch is the root bridge. Its shown below:

The value 32768 is the default value . The root path cost is the cost of the path to the root bride. Since this is the root bridge itself, so you see the Root Path Cost value of Zero.

>> There is one more thing that STP operates on Layer 2 (Data Link Layer). It doesn’t contain the information for Layer 3 (Network Layer). See the snapshot below:

It can be seen clearly that there is a MAC Address information displayed for STP packets instead of IP Address information which is displayed for other layer 3 packets.