Dell PowerConnect 3524P User's Guide - Page 337
Path Cost 1-20, Default Path Cost
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• Root Guard - Prevents devices outside the network core from being assigned the spanning tree root. - Checked - Root guard is enabled on the port. - Unchecked - Root guard is disabled on the port. • LAG State - Current STP state of a LAG. If enabled, the LAG state determines what forwarding action is taken on traffic. If the bridge discovers a malfunctioning LAG, the LAG is placed in the Broken state. Possible LAG states are: - Disabled - STP is currently disabled on the LAG. The LAG forwards traffic while learning MAC addresses. - Blocking - The LAG is blocked and cannot be used to forward traffic or learn MAC addresses. - RSTP Discarding State - In this state the port does not learn MAC addresses and do not forward frames. - This state is union of Blocking, and Listening state introduced in STP (802.1.D). - Listening - The LAG is in the listening mode and cannot forward traffic or learn MAC addresses. - Learning - The LAG is in the learning mode and cannot forward traffic, but it can learn new MAC addresses. - Forwarding - The LAG is currently in the forwarding mode, and it can forward traffic and learn new MAC addresses. - Broken - The LAG is currently malfunctioning and cannot be used for forwarding traffic. • Role - Indicates the LAG role assigned by the STP algorithm that provides STP paths. The possible field values are: - Root - Provides the lowest cost path to forward packets to root switch. - Designated - Indicates that the via which the designated switch is attached to the LAN. - Alternate - Provides an alternate LAG 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. Backup ports also occur when a LAN has two or more connections connected to a shared segment. - Disabled - Indicates the LAG is not participating in the Spanning Tree. • Path Cost (1-200000000) - Amount the LAG contributes 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 being rerouted. The path cost has a value of 1 to 200000000. • Default Path Cost - Indicates if the device uses the default path cost. The possible field values are: - Checked - Device uses the default path cost. - Unchecked - Device uses path cost defined in the Path Cost field above. • Priority - Priority value of the LAG. The priority value influences the LAG choice when a bridge has looped ports. The priority value is between 0-240, in steps of 16. • Designated Bridge ID - The priority and the MAC Address of the designated bridge. Configuring Switch Information 337