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Chapter 5: Using the Web-based Utility for Configuration
Spanning Tree Tab - RSTP Port Settings
WebView Switches
Spanning Tree Tab - RSTP Port Settings
While the classic spanning tree prevents Layer 2 forwarding loops in a general network topology, convergence
can take between 30-60 seconds. This time may delay detecting possible loops, and propagating status topology
changes. Rapid Spanning Tree Protocol (RSTP) detects and uses network topologies that allow a faster STP
convergence without creating forwarding loops.
Interface. Displays the port or LAG on which Rapid STP is enabled.
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 switch.
• Designated. Indicates that the port or LAG via which the designated switch is attached to the LAN.
• Alternate. Provides an alternate path to the root switch 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.
Mode. Indicates the current Spanning Tree mode. The Spanning Tree mode is selected in the Global STP screen.
The possible field values are:
• Classic STP. Indicates that Classic STP is enabled on the device.
• Rapid STP. Indicates that Rapid STP is enabled on the device.
• Multiple STP. Indicates that Multiple STP is enabled on the device.
Fast Link. Indicates if Fast Link is enabled or disabled for the port or LAG. If Fast Link is enabled for a port, the
port is automatically placed in the forwarding state (configurable from Spanning Tree - STP Port Settings tab).
Port State. Indicates if RSTP is enabled on the interface.
Point-to-Point Admin Status. Indicates if a point-to-point links are established, or permits the device to
establish a point-to-point link. The possible field values are:
•Auto. Point-to-point links are automatically established by the device.
Figure 5-48: Spanning Tree - RSTP Port Settings