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Allied Telesis AT-8000S Switch
Web Browser Interface User’s Guide
Configuring Rapid Spanning Tree
While Classic STP 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. The Global System LAG information displays the same field information as the
ports, but represent the LAG RSTP information.
To define RSTP on the device:
1. Click Layer 2 > RSTP. The RSTP Page opens:
Figure 57: RSTP Page
The RSTP Page contains the following fields:
• Unit Number — Indicates the stacking member for which the Rapid STP information is displayed.
• Interface — Displays the port or LAG on which Rapid STP is enabled.
• State — Indicates if
• Role — Displays the port role assigned by the STP algorithm to provide to STP paths. The possible field
values are:
– Root — Provides the lowest cost path to forward packets to the root switch.
– Designated — The port or LAG through which the designated switch is attached to the LAN.
– Alternate — Provides an alternate path to the root switch from the root interface.