Phoenix Contact FL NAT SMN 8TX, Руководство пользователя, Страница: 84 / 102

FL NAT SMN 8TX(-M)
5-18
PHOENIX CONTACT 7966_en_04
Example with fast ring detection
Figure 5-13 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 bridge 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.
5.1.5.4 Method of operation of the Spanning Tree Protocol (STP)
Path costs
In a LAN segment, data is distributed with different speeds and methods, e.g., 100 Mbps full
duplex or 10 Mbps half duplex. The interconnection of network devices involves different
transmission bandwidths and different performance characteristics - which means there are
also different “path costs”.
“High path costs” are associated with low-performance connections, e.g., 10 Mbps half
duplex, while “low path costs” are associated with connections with a high total transmission
speed, e.g., 100 Mbps full duplex.
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
Priorität: 0
Switch 2
Backup-Root-Bridge
Priorität: 4000
Discarding Port
Switch 3
Priorität: Default
Switch 4
Priorität: 40000
Switch 6
Priorität: Default
Switch 5
Priorität: Default
Switch 7
Priorität: 40000
Switch 8
Priorität: Default
Switch 9
Priorität: Default
Switch 10
Priorität: Default
Switch 12
Priorität: Default
Switch 11
Priorität: 40000
74710018
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
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