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Intel® Gigabit Ethernet Switch AXXSW1GB User Guide 91
• Forward Transitions — Indicates the number of times the port has changed from
Discarding state to Forwarding state.
• LAG — Indicates the LAG to which the port belongs.
If LAGs are selected, the following fields are displayed:
• LAG — Indicates the LAG to which the port belongs.
• STP — Indicates if STP is enabled on the port. The possible field values are:
— Enabled — Indicates that STP is enabled on the port.
— Disabled — Indicates that STP is disabled on the port.
• Port Fast— Indicates if Fast Link is enabled on the port. If Fast Link mode is enabled
for a port, the Port State is automatically placed in the Forwarding state when the port
link is up. Fast Link optimizes the STP protocol convergence. STP convergence can
take 30-60 seconds in large networks. The possible field values are:
— Enabled — Port Fast is enabled.
— Auto — Port Fast mode is enabled a few seconds after the interface becomes
active.
— Disabled — Port Fast is disabled.
• Root Guard — Prevents devices outside the network core from being assigned the
spanning tree root.
• State — Displays the current STP state of a port. If enabled, the port state determines
what forwarding action is taken on traffic. Possible port states are:
— Disabled — Indicates that STP is currently disabled on the port. The port
forwards traffic while learning MAC addresses.
—Forwarding — Indicates that the port can forward traffic or learn MAC
addresses.
— Discarding - Indicates that the port is currently blocked and cannot
forward traffic or learn MAC addresses
•
Port 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 — 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.
— Disable — The port is not participating in the Spanning Tree.