Port State — The current port STP state. If enabled, the port state determines what forwarding action is taken on traffic. Possible port states are:

Disabled — The port link is currently down.

Blocking — The port is currently blocked and cannot be used to forward traffic or learn MAC addresses. Blocking is displayed when Classic STP is enabled.

Listening — The port is currently in the listening mode. The port cannot forward traffic nor can it learn MAC addresses.

Learning — The port is currently in the learning mode. The port cannot forward traffic however it can learn new MAC addresses.

Forwarding — The port is currently in the forwarding mode. The port can forward traffic and learn new MAC addresses.

Role — Displays the port role assigned by the STP algorithm to provide to STP paths. The possible field values are:

Root — Provides the lowest cost path to forward packets to the root switch.

Designated — Indicates the port or LAG through which the designated switch is attached to the LAN.

Alternate — Provides an alternate path to the root switch from the root interface.

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.

Speed — Speed at which the port is operating.

Path Cost (1-200000000)— The port contribution to the root path cost. The path cost is adjusted to a higher or lower value, and is used to forward traffic when a path being rerouted.

Default Path Cost — The default path cost of the port is automatically set by the port speed and the default path cost method.

The default values for long path costs are:

Ethernet - 2000000

Fast Ethernet - 200000

Gigabit Ethernet - 20000

The default values for short path costs (short path costs are the default) are:

Ethernet - 100

Fast Ethernet - 19

Gigabit Ethernet - 4

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