HP BladeSystem bc2800 Embedded Web System User Guide for the HP BladeSystem PC - Page 118

Configuring Spanning Tree ◆ Blocking - Indicates that the port is currently blocked and cannot forward traffic or learn MAC addresses. Blocking is displayed when Classic STP is enabled. ❏ 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 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 rerouted. ❏ 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. ❏ Forward Transitions - Indicates the number of times the port has changed from Forwarding state to Blocking state. ❏ LAG - Indicates the LAG to which the port belongs. 9-6 www.hp.com Embedded Web System User Guide