User manual
Rapid Spanning Tree
7278_en_01 PHOENIX CONTACT 4-15
Figure 4-13 Example 2 for the "relevant path"
4.2.1.12 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.
72780012
Inactive connection
Relevant path
for setting the
timer values
Active connection
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
FL SWITCH 5TX
Ord.No.2832085
US1
US2
FL SWITCH LM 8TX
Ord.-No.2832632
1
2
3
4
5
6
7
8
FL SWITCH 5TX
Ord.No.2832085
US1
US2
FL SWITCH LM 8TX
Ord.-No.2832632
1
2
3
4
5
6
7
8
FL SWITCH 5TX
Ord.No.2832085
US1
US2
FL SWITCH LM 8TX
Ord.-No.2832632
1
2
3
4
5
6
7
8