Alcatel OS-LS-6224 User Manual page 218

3
Configuring the Switch
All ports are discarding when the switch is booted, then some of them change state
to learning, and then to forwarding.
Command Attributes
• Unit No. — Indicates the stacking member for which the STP settings information
is displayed.
• Query by Interface — Queries the interface configuration table either by: All ports,
All Lags, Active Ports or Blocked Ports.
• Interface — The interface for which the information is displayed.
• STP — Indicates if STP is enabled on the port. The possible field values are:
• Enable — Indicates that STP is enabled on the port.
• Disable — Indicates that STP is disabled on the port.
• Priority — Indicates the 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.
• 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:
• Disabled — Indicates that STP is currently disabled on the port. The port
forwards traffic while learning MAC addresses.
• Blocking — Indicates that the port is currently blocked and cannot forward traffic
or learn MAC addresses. Blocking is displayed when Classic STP is enabled.
• Forwarding — Indicates the port is currently in the Forwarding mode. The port
can forward traffic and learn new 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 to
a shared segment.
• Disabled — 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.
• Default Path Cost — Indicates if the default path cost of the port is automatically
set by the port speed and the default path cost method.
• Port Fast — Indicates if Fast Link is enabled on the port. If Fast Link mode is
enabled for a port, the Port State is automatically placed in the Forwarding state
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