Cisco SPS208G User Manual page 194

Spanning Tree
STP Port Settings
SPS208G/SPS224G4/SPS2024 Service Provider Switches User Guide
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Backup
— Provides a backup path to the designated port path toward
the Spanning Tree leaves. Backup ports occur only when two ports are
connected in a loop by a point-to-point link, or when a LAN has two or
more connections connected to a shared segment.
-
Disabled
— The port is not participating in the Spanning Tree.
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