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332 Configuring Switch Information
The STP Port Settings page contains the following fields:
•
Select a Port
— Specifies the port number on which STP settings are to be to modified.
•
STP
— Enables or disables STP 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.
•
Fast Link
— Enables Fast Link mode for the port. If Fast Link mode is enabled for a port, the
Port
State
is automatically placed in the
Forwarding
state
when the port link is up. Fast Link mode
optimizes the time it takes for the STP protocol to converge. STP convergence can take 30-60 seconds
in large networks. The possible values are:
–
Checked
— Fast Link is enabled.
–
Unchecked
— Fast Link is disabled.
•
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.
•
Port State
— Indicates 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
— STP is currently disabled on the port. The port forwards traffic while learning
MAC addresses.
–
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
— 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.