Intel manual Intel Gigabit Ethernet Switch AXXSW1GB User Guide

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.

•Port 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:

—Forwarding — Indicates that the port can forward traffic or learn MAC addresses.

—Disabled — Indicates that STP is currently disabled on the port. The port forwards traffic while learning MAC addresses.

—Discarded — 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.

•Speed — Indicates the speed at which the port is operating.

•Path Cost — Indicates 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 is re- routed.

•Priority — Priority value of the port. The priority value influences the port choice when a bridge has two ports connected in a loop. The priority value is between 0 -240. The priority value is determined in increments of 16.

•Designated Bridge ID — Indicates the bridge priority and the MAC Address of the designated bridge.

•Designated Port ID — Indicates the selected port priority and interface.

•Designated Cost — Indicates the cost of the port participating in the STP topology. Ports with a lower cost are less likely to be blocked if STP detects loops.

90 Intel® Gigabit Ethernet Switch AXXSW1GB User Guide