Planet Technology WGSW-48040 - Manual (Page 105)

User’s Manual of WGSW-24020/WGSW-48040
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4.9.4 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 (refer to figure 4-51).
Figure 4-51 RSTP Port Settings screen
The page contains the following fields:
Interface
Where displays the port or LAG on which Rapid STP is enabled.
Role
Where indicates the port role assigned by the STP algorithm in order to provide to
STP paths. The possible field values are:
• Root, where provides the lowest cost path to forward packets to root switch.
• Designated, where indicates that the port or LAG via which the designated
switch is attached to the LAN.
• Alternate, which provides an alternate path to the root switch from the root
interface.
• Backup, which 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 , which indicates the port is not participating in the Spanning Tree.
Mode
Where indicates the current Spanning Tree mode. The Spanning Tree mode is
selected in the Global STP screen. The possible field values are:
• Classic STP, which indicates that Classic STP is enabled on the device.