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ManualsBrandsPhoenix ManualsNetworkingInterface Module 2x RJ-45 Ethernet
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(Rapid) Spanning Tree
6874_en_09 PHOENIX CONTACT 5-19
Example with fast ring detection
Figure 5-15 Example with fast ring detection
The switches in the illustrated example are arranged in such a way that two devices at the
central position are configured as the root bridge and as the backup root bridge (via the
priority).
The root bridge has the lowest priority, the backup root bridge has the second lowest
priority. The root and the backup root bridge are connected together redundantly. The
remaining switches are networked in several rings in a ring topology. The end points of the
ring are implemented on the root bridge and on the backup root bridge. The switch furthest
away from the root bridge has a low priority as its default setting, e.g., 40000.
The advantage of this constellation is that the individual rings are not adversely affected in
the event of an error.
5.2.5.4 Method of Operation of the Spanning Tree Protocol (STP)
Components of a Spanning Tree Domain
Designated Switch
The switch that connects a specific LAN segment (with the lowest path costs) to the root
switch.
Root Port
The other switches set the port with the lowest path costs (or with the highest total
transmission speed) as the root switch in the forwarding state.
FLSWITCH MCS 16TX
Ord.No.2832700
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
FLSWITCH 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
FLSWITCH 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
FLSWITCH MCS 16TX
Ord.No.2832700
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
Switch 1
Root bridge
Priority: 0
Switch 2
Backup root bridge
: 4000Priority
Discarding port
Switch 3
Priority: Default
Switch 4
: 40000Priority
Switch 6
: DefaultPriority
Switch 5
: DefaultPriority
Switch 7
: 40000Priority
Switch 8
: DefaultPriority
Switch 9
: DefaultPriority
Switch 10
: DefaultPriority
Switch 12
: DefaultPriority
Switch 11
: 40000Priority
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