Configuring Spanning Tree
Defining Spanning Tree
Cisco Small Business SFE/SGE Managed Switches Administration Guide 255
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Designated
— The port or LAG through which the designated switch is
attached to the LAN.
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Alternate
— Provides an alternate path to the root switch from the root
interface.
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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.
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Disabled
— The port is not participating in the Spanning Tree.
• 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
being rerouted.
• 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 range 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 selected port’s priority and interface.
• Designated Cost — Indicates the 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 Transitions — Indicates the number of times the port has changed
from the Blocking state to Forwarding state.
• LAG — Indicates the LAG to which the port belongs. If a port is a member of a
LAG, the LAG settings override the port settings.
STEP 2 Define the relevant fields.
STEP 3 Click Apply. STP is enabled on the interface, and the device is updated.
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