Dell PowerConnect 5448 User's Guide - Page 309
Default Path Cost, Path Cost 1-20
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• Port State - The current port STP state. If enabled, the port state determines what forwarding action is taken on traffic. Possible port states are: - Disabled - The port link is currently down. - Blocking - The port is currently blocked and cannot be used to forward traffic or learn MAC addresses. Blocking is displayed when Classic STP is enabled. - Listening - The port is currently in the listening mode. The port cannot forward traffic nor can it learn MAC addresses. - 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 - 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 - Indicates 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. - Disabled - 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 of the port is automatically set by the port speed and the default path cost method. The default values for long path costs are: - Ethernet - 2000000 - Fast Ethernet - 200000 - Gigabit Ethernet - 20000 The default values for short path costs (short path costs are the default) are: - Ethernet - 100 - Fast Ethernet - 19 - Gigabit Ethernet - 4 Configuring Device Information 309