Wavetronix Click 342 (lean managed ethernet switch) (CLK-342) - Managed Switches User Guide - Manual (Page 65)

64 CHAPTER 6 • RAPID SPANNING TREE
Figure 6.12 – Example 2 for the Relevant Path
Reconfiguration Times
The reconfiguration time for a Spanning Tree depends on the timer values for MaxAge and
Forward Delay.
The minimum reconfiguration time is: 2 × Forward Delay The maximum reconfiguration
time is: 2 × Forward Delay + MaxAge.
For the values recommended by the IEEE standard, the value for ten active STP switches
along a path beginning with the root switch is between 30 seconds and 50 seconds.
The Table below shows an overview of the switch-over time response in seconds to be ex-
pected for the maximum number of switches within a Spanning Tree segment (see Table
6.2).
MaxAge Hello Time Forward Delay Maximum Number of
Active STP Switches
Switch-Over
Time
10 s 1 s ≥ 6 s 5 22 s
20 s 1 s ≥ 11 s 10 42 s
30 s 1 s ≥ 16 s 15 62 s
40 s 1 s ≥ 21 s 20 82 s
20 s 2 s 15 s 9 50 s
Table 6.2 – Switch-Over Time Response to Be Expected for Spanning Tree