Spanning Tree
STP Port Settings
Cisco Small Business SLM Series Smart Switches Administration Guide 60
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Auto
— Port Fast mode is enabled a few seconds after the interface
becomes active.
-
Disable
— Indicates that Fast Link is disabled on the port.
• 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 STP
is enabled.
-
Listening
— Indicates that the port is in Listening mode. The port cannot
forward traffic nor can it learn MAC addresses.
-
Learning
— Indicates that the port is in Learning mode. The port cannot
forward traffic, however it can learn new MAC addresses.
-
Forwarding
— Indicates that the port is in Forwarding mode. The port
can forward traffic and learn new MAC addresses.
• 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. Ports with a lower cost are less
likely to be blocked if STP detects loops.
• Default Path Cost — When checked, returns the port path cost to its default
value.
• Priority — 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 — Indicates the bridge priority and the MAC Address
of the designated bridge.
• Designated Port ID — Indicates the port designated priority and interface.
• Designated Cost — Indicates the path cost of the port to the root bridge
participating in the STP topology. Ports with a lower cost are less likely to
be blocked if STP detects loops.
• Forward Transitions — Indicates the number of times the port has changed
from the Blocking state to Forwarding state.
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