(Rapid) Spanning Tree
7966_en_04
PHOENIX CONTACT
5-17
5.1.5.2
Example topologies
5.1.5.3
Redundant coupling of network segments
In this example, two network segments are connected via redundant data paths. Two RSTP
components have ports in the “Blocking/Discarding” state (highlighted in gray). This is
sufficient to operate the network.
Figure 5-12
Redundant coupling of network segments
6
7
8
9
10
74710019
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
US2
US1 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
US2
US1 GND
GND
R1
R2
00A0451BDD
MAC
Address
V.24
1
2
3
4
5
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
US2
US1 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
US2
US1 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
1
3
5
7
2
4
6
8
9
11
13
15
10
12
14
16
9
16
10 11 12 13 14 15
1
8
2
3
4
5
6
7
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
1
3
5
7
2
4
6
8
9
11
13
15
10
12
14
16
9
16
10 11 12 13 14 15
1
8
2
3
4
5
6
7
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
1
3
5
7
2
4
6
8
9
11
13
15
10
12
14
16
9
16
10 11 12 13 14 15
1
8
2
3
4
5
6
7
MODE
ACT 100
FD
US1 US2 FAIL
X19
V.24
X17
US1 GND US2 GND
X18
R1 R2
00.A0.45.06.04.02
MAC
Address
1
2
3
4
LINK
Mode
US2 FAIL
X9
US1 GND US2 GND
X10
R1 R2
FL SWITCH SMSC 8GT
Ord. No. 2891123
US1
X11
MEM
MODE
SPD FD
ACT
5
6
7
8
X12
V.24
1
3
5
7
2
4
6
8
00.A0.45.06.04.02
MAC
Address
1
2
3
4
LINK
Mode
US2 FAIL
X9
US1 GND US2 GND
X10
R1 R2
FL SWITCH SMSC 8GT
Ord. No. 2891123
US1
X11
MEM
MODE
SPD FD
ACT
5
6
7
8
X12
V.24
1
3
5
7
2
4
6
8
00.A0.45.06.04.02
MAC
Address
1
2
3
4
LINK
Mode
US2 FAIL
X9
US1 GND US2 GND
X10
R1 R2
FL SWITCH SMSC 8GT
Ord. No. 2891123
US1
X11
MEM
MODE
SPD FD
ACT
5
6
7
8
X12
V.24
1
3
5
7
2
4
6
8
