User manual
(Rapid) Spanning Tree
6874_en_09 PHOENIX CONTACT 5-25
Figure 5-19 Example 2 for the "relevant path"
5.2.5.10 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 s and 50 s.
Switch-Over Time Response to Be Expected for RSTP and RSTP With Activated
Ring Detection
When using RSTP, expect switch-over times in the range from 100ms to 2s.
When using fast ring detection, expect switch-over times in the range from 100 ms to
500 ms.
705600107
Inactive link
Relevant path
for setting the
timer values
Active link
LNK
MODE
1
2
X1
LNK
MODE
1
2
X2
LNK
MODE
1
2
X3
LNK
MODE
1
2
X4
US1
US2
Fail
Reset
MODE
ACT
100
FD
FL SWITCH MM HS
Ord. No.28 32 32 6
US2US1
GND GND
R1 R2
00A0451BDD
MAC
Address
V.24
LNK
MODE
1
2
X1
LNK
MODE
1
2
X2
LNK
MODE
1
2
X3
LNK
MODE
1
2
X4
US1
US2
Fail
Reset
MODE
ACT
100
FD
FL SWITCH MM HS
Ord. No.28 32 32 6
US2US1
GND GND
R1 R2
00A0451BDD
MAC
Address
V.24
LNK
MODE
1
2
X1
LNK
MODE
1
2
X2
LNK
MODE
1
2
X3
LNK
MODE
1
2
X4
US1
US2
Fail
Reset
MODE
ACT
100
FD
FL SWITCH MM HS
Ord. No.28 32 32 6
US2US1
GND GND
R1 R2
00A0451BDD
MAC
Address
V.24
LNK
MODE
1
2
X1
LNK
MODE
1
2
X2
LNK
MODE
1
2
X3
LNK
MODE
1
2
X4
US1
US2
Fail
Reset
MODE
ACT
100
FD
FL SWITCH MM HS
Ord. No.28 32 32 6
US2US1
GND GND
R1 R2
00A0451BDD
MAC
Address
V.24
LNK
MODE
1
2
X1
LNK
MODE
1
2
X2
LNK
MODE
1
2
X3
LNK
MODE
1
2
X4
US1
US2
Fail
Reset
MODE
ACT
100
FD
FL SWITCH MM HS
Ord. No.28 32 32 6
US2US1
GND GND
R1 R2
00A0451BDD
MAC
Address
V.24
LNK
MODE
1
2
X1
LNK
MODE
1
2
X2
LNK
MODE
1
2
X3
LNK
MODE
1
2
X4
US1
US2
Fail
Reset
MODE
ACT
100
FD
FL SWITCH MM HS
Ord. No.28 32 32 6
US2US1
GND GND
R1 R2
00A0451BDD
MAC
Address
V.24
FL SWITCH MCS 16TX
Ord.No. 28 32 70 0
00.A0.45.1B.D2.1D
MAC
Address
1357
2468
9
11
13
15
10
12
14
16
91610 11 12 13 14 15
18234567
MODE
ACT
100
FD
US1 US2
FAIL
X19
V.24
X17
US1 GND US2 GND
X18
R1 R2
FL SWITCH MCS 16TX
Ord.No. 28 32 70 0
00.A0.45.1B.D2.1D
MAC
Address
1357
2468
9
11
13
15
10
12
14
16
91610 11 12 13 14 15
18234567
MODE
ACT
100
FD
US1 US2
FAIL
X19
V.24
X17
US1 GND US2 GND
X18
R1 R2
FL SWITCH MCS 16TX
Ord.No. 28 32 70 0
00.A0.45.1B.D2.1D
MAC
Address
1357
2468
9
11
13
15
10
12
14
16
91610 11 12 13 14 15
18234567
MODE
ACT
100
FD
US1 US2
FAIL
X19
V.24
X17
US1 GND US2 GND
X18
R1 R2