Dell PowerConnect 35 SERIES, User Manual

Page: 348 / 474

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Configuring Switch Information
• Role — Indicates the port role assigned by the STP algorithm in order to provide to STP paths.
The possible field values are:
– Root — Provides the lowest cost path to forward packets to root device.
– Designated — Indicates the port or LAG via which the designated device is attached to the LAN.
– Alternate — Provides an alternate path to the root device 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.
• 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 possible range
is 1-200,000,000.
• Default Path Cost — Indicates if the default path cost is used. The possible values are:
– Checked — Default path cost is used.
– Unchecked — Path cost is user-defined.
• Designated Bridge ID — The bridge ID number that connects the link or shared LAN to the root.
• Designated Port ID — The Port ID number on the designated bridge that connects the link or the
shared LAN to the root.
• Designated Cost — Cost of the path from the link or the shared LAN to the root.
• Forward Transitions — Number of times the port changed to the forwarding state.
• Remain Hops — Indicates the number of hops remaining to the next destination.
Defining MSTP Interface Settings
1 Open the MSTP Interface Settings page.
2 Select an interface.
3 Define the fields.
4 Click Apply Changes .
MSTP parameters are defined, and the device is updated.