Web-based Configuration Guide Advanced Configuration
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Table 8-2 Description of STP Configuration Parameters of Ports
Root: A port with the shortest path to the root
Alternate: A backup port of a root port. Once the root port fails,
the alternate port becomes the root port immediately.
Designated (designated ports): A port that connects a root bridge
or a upstream bridge to a downstream device.
Disable (blocked ports): Ports that have no effect in the spanning
tree.