Wavetronix Click 342 (lean managed ethernet switch) (CLK-342) Manuale Utente Scaricare il pdf (Pagina 65)

64 CHAPTER 6  RAPID SPANNING TREE

Figure 6.12 – Example 2 for the Relevant Path

Reconﬁguration Times

e reconguration time for a Spanning Tree depends on the timer values for MaxAge and

Forward Delay.

e minimum reconguration time is: 2 × Forward Delay e maximum reconguration

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.

e 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

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 75 76

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Wavetronix Click 342 (lean managed ethernet switch) (CLK-342) Manuale Utente Pagina 65