Dell PowerConnect 3424P User's Guide (.htm) - Page 281
Designated Bridge ID, Default Path Cost
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Learning - The port is currently in the learning mode. The port cannot forward traffic however it can learn new MAC addresses. Forwarding - The port is currently in the forwarding mode. The port can forward traffic and learn new MAC addresses. Role-Indicates the port 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 port via 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. Backup ports also occur when a LAN has two or more connections connected to a shared segment. Disabled-Indicates the port is not participating in the Spanning Tree. Speed - Speed at which the port is operating. Path Cost (1-200000000) - 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 being rerouted. Default Path Cost - The default path cost. The default values for long path costs are: Ethernet - 2,000,000 Fast Ethernet - 200,000 Gigabit Ethernet - 20,000 The default values for short path costs are: Ethernet - 100 Fast Ethernet - 19 Gigabit Ethernet - 4 Priority (0-240, in steps of 16) - 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 provided in increments of 16. Designated Bridge ID - The bridge priority and the MAC Address of the designated bridge. Designated Port ID - The designated port's priority and interface. Designated Cost - 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 Transmission - Number of times the port has changed from the Forwarding state to Blocking. LAG - The LAG to which the port is attached. Configuring Switch Information 281