4 rstp port settings – Planet Technology WGSW-48040 User Manual

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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.

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