FL SWITCH MM HS
5-20
PHOENIX CONTACT
6874_en_16
Example with fast ring detection
Figure 5-16
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.
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
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
Switch 1
Root bridge
Priority: 0
Switch 2
Backup root bridge
Priority: 4000
Discarding port
Switch 3
Priority: Default
Switch 4
Priority: 40000
Switch 6
Priority: Default
Switch 5
Priority: Default
Switch 7
Priority: 40000
Switch 8
Priority: Default
Switch 9
Priority: Default
Switch 10
Priority: Default
Switch 12
Priority: Default
Switch 11
Priority: 40000
687409059
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