Wavetronix Click 342 (lean managed ethernet switch) (CLK-342) - Managed Switches User Guide - Manual (Page 66)

CHAPTER 6 • RAPID SPANNING TREE 65
Configuration Notes for Rapid Spanning Tree
In contrast to the Spanning Tree method, the Rapid Spanning Tree method supports event-
controlled actions that are no longer triggered based on a timer.
If one cable fails (link down), the Rapid Spanning Tree method can respond more quickly
to this failure and thus the switch-over time can be kept low.
A link down or link up must be detected at the switch so that the RSTP switches can detect
a line failure and a restored line more quickly. Please take into consideration, in particular,
paths where media converters are used. If required, media converters offer setting options
to transmit the link status of the fiber optic side to the twisted pair side.
Note
If a link down is not detected at the switch, due to the cable interrupt between the
media converters, and if no link down is forced at the switch, timer-based detection
is activate, which may result in longer switch-over times.
Below is a list of network suggestions:
˽ For short switch-over times, structure your network in such a way that a maximum of
seven switches are located in a cascade up to the root switch. The switch-over times can
range from 2 to 8 seconds.
˽ Use priority assignment to specify a central switch as the root.
˽ It is also recommended to assign a switch as the back-up root.
˽ For short switch-over times, all switches should support the Rapid Spanning Tree Pro-
tocol.