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Routing & Switching · Intermediate

Root Guard

An STP feature that prevents a port from becoming a root port; superior BPDUs place it in root-inconsistent state.

Definition

Root guard is applied on designated ports facing switches that should never become root, typically distribution ports toward access switches. The port recovers automatically when superior BPDUs stop.

Example

spanning-tree guard root

Exam tip

Root guard recovers automatically, unlike BPDU guard, which errdisables.

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