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What are Spanning Tree Bridge Priority (Switch Priority) and Bridge ID (Switch ID) values

Every Bridge (Switch) Participating in a Spanning Tree Protocol network is assigned with a numerical value called Bridge Priority (Switch Priority) Value. Bridge Priority (Switch Priority) Value is a 16-bit binary number.

By default, all Cisco Switches has a Bridge Priority (Switch Priority) value of 32,768. Bridge Priority (Switch Priority) value decides which Switch can become Root Bridge (Root Switch). A Switch with lowest Bridge Priority (Switch Priority) Value will become the Root Bridge (Root Switch)

The Bridge Priority (Switch Priority) value is used to find the Bridge ID (Swtich ID).

The Bridge ID (Swtich ID) is made from two values.

The Switch Priority, which is a numerical value defined by IEEE 802.1D, which is equal to 32,768 by default.

The MAC Address of the Switch.

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