Configuring Spanning Tree
Defining Multiple Spanning Tree
Cisco Small Business SFE/SGE Managed Switches Administration Guide 269
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Forwarding
— Indicates that the port is in Forwarding mode. The port
can forward traffic and learn new MAC addresses.
• Type — Indicates if the port is a point-to-point port, or a port connected to a
hub. The possible field values are:
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Boundary Port
— Indicates the port is a boundary port. A Boundary port
attaches MST bridges to LAN in an outlying region. If the port is a
boundary port, it also indicates whether the device on the other side of
the link is working in RSTP or STP mode
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Master Port
— Indicates the port is a master port. A Master port
provides connectivity from a MSTP region to the outlying CIST root.
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Internal
— Indicates the port is an internal port.
• Role — Indicates the port role assigned by the STP algorithm in order to
provide to STP paths. The possible field values are:
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Root
— Provides the lowest cost path to forward packets to root device.
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Designated
— Indicates the port or LAG via which the designated
device is attached to the LAN.
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Alternate
— Provides an alternate path to the root device 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. Backup ports also occur
when a LAN has two or more connections connected to a shared
segment.
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Disabled
— Indicates the port is not participating in the Spanning Tree.
• Mode — Indicates the current Spanning Tree mode. The possible field values
are:
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Classic STP
— Indicates that Classic STP is enabled on the port.
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Rapid STP
— Indicates that Rapid STP is enabled on the port.
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MSTP
— Indicates that MSTP is enabled on the port.
• Interface Priority — Defines the interface priority for specified instance. The
default value is 128.
• Path Cost — Indicates the port contribution to the Spanning Tree instance. The
range is 1-200,000,000.
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