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Routing & Switching · Foundational

Bridge Priority

The configurable portion of the STP bridge ID, 0-61440 in steps of 4096, default 32768.

Definition

Lowering a switch's priority makes it the root for a VLAN. spanning-tree vlan X root primary sets 24576 or lower than the current root, and root secondary sets 28672.

Example

spanning-tree vlan 10 priority 4096

Exam tip

root primary is a macro that calculates a value once; it does not continuously guarantee root status.

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