Owner's Manual

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Figure 13-23. Rapid Spanning Tree
Yo u c an Add, Edit or Remove RSTP settings for the selected device in this screen (although some
devices restrict actions to viewing the settings when you click
Edit ). Click Remove to delete a
selected, listed item. When you click
Add (or select an existing interface listed in the RSTP
Settings
portion of the screen and click Edit ) the RSTP Editor opens (the lower portion of the
screen) with the following fields:
-
Interface —Port or LAG on which Rapid STP is enabled.
-
State — Enabled or Disabled . (Does not appear for all devices)
-
Role —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—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. Backup ports
also occur when a LAN has two or more connections connected to a shared segment.
Disabled—The port is not participating in the Spanning Tree (the port’s link is down).