•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
—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
—Disable — The port is not participating in the Spanning Tree.
Intel® Gigabit Ethernet Switch AXXSW1GB User Guide | 91 |