D-Link xStack DES-3228PA, Web/Installation Manual, Page: 105 / 274

Configuring Spanning Tree
Defining Multiple Spanning Tree
Page 102
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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 — Indicates the port is not participating in the Spanning Tree.
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Mode — Indicates the STP mode by which STP is enabled on the device. The possible field values are:
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Classic STP — Classic STP is enabled on the device. This is the default value.
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Rapid STP — Rapid STP is enabled on the device.
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Multiple STP — Multiple STP is enabled on the device.
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Interface Priority (0-240,in steps of 16) — Defines the interface priority for the specified instance. The
default value is 128.
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Path Cost (1-200,000,000) — Indicates the port contribution to the Spanning Tree instance. The range
should always be 1-200,000,000.
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Designated Bridge ID — Displays the ID of the bridge that connects the link or shared LAN to the root.
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Designated Port ID — Displays the ID of the port on the designated bridge that connects the link or the
shared LAN to the root.
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Designated Cost — Indicates that the default path cost is assigned according to the method selected on the
Spanning Tree Global Settings page.
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Forward Transitions — Indicates the number of times the LAG State has changed from a Forwarding state
to a Blocking state.
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Remain Hops — Indicates the hops remaining to the next destination.
2. Click . The MSTP Interface Table opens.