GE Mark VIe System Manual page 79

3.1.1.1 Mesh Architecture for UDH, PDH, MDH
The large industrial plant network architecture involves the use of root switches that communicate the Integrated Control
System (ICS) virtual local area networks (VLANs) over Single Mode Fiber (SMF) trunks to edge switches. For redundancy,
two or more identical switches are cabled together, enabling them to act as one switch with the port capacity of the combined
switches. These cables are connected through special ports or plug sockets in the rear of the switches.
Note Refer to NetworkST for Mark VIe Controls Application Guide (GEH-6840).
Redundant switch cabling offers the following advantages:
• Built-in failover and recovery (failback) in the event one of the switches fails.
• An unconfigured switch can be used to replace a failed switch in pair. It will automatically upload the running
configuration from the other switch in the group.
• Enhanced network storm control protection
• Network redundancy
• Gigabyte uplink speeds (with SMF)
• Enhanced Quality of Service (QoS) – ensures UDH (controller traffic) always has priority over PDH network traffic.
• Cisco switches are 802.1x compliant.
The current large industrial plant network topology uses pairs of edge switches and pairs of root switches to achieve
redundancy. Devices with redundant communications (HMIs, controllers) have a network connection to each of the two
switches in the pair. For Triple Modular Redundant
the S and T controllers are connected to the second switch.
Edge S witches
1 2 3 4 5 6 7 8 9 10 11 12
SYST 1 X 11 X
R PS
M STR
STA T
D PLX
SPED
STC K
2 X 12 X
M O D E
1 2 3 4 5 6 7 8 9 10 11 12
SYST 1 X 11 X
R PS
M STR
STA T
D PLX
SPED STC K
2 X 12 X
M O D E
The Root bridge switch is at the top of the network spanning tree. The edge switches (Ethernet connections) are then
connected below the root switch. The most important element to this spanning tree is the root bridge placement. It should be
the most centralized switch on the network (typically located in the control room). All data flow across the network is from
the perspective of this switch. Root switches are configured to provide the control system VLANs and other optional
networks over trunks to the edge switches.
Ethernet Networks
(TMR) controllers, the R controller is connected to the first switch, and
Root Switches
C O NSO LE
FN SYST XPSSTAT S PEED D U PLX
M O DE S- P WR M A ST S TAC K
C at a l y st 3750 - X Ser i e s
C O NSO LE X PSSTAT S PEED FN SYST D U PLX
M O DE S- P WR M A ST S TAC K
C at a l y st 3750 - X Ser i e s
Edge Switches
13 1415 16 17 18 19 2021 22 23 24 C at al y st 2960 - S Seri e s
C O NSO LE M G M T
13 X 23 X
B A S SYST
E T RPS
MSTR STAT
D PLX
SPED
STCK
X 14 24 X
25 26 27 28 M O D E
13 1415 16 17 18 19 2021 22 23 24 C at al y st 2960 - S Seri e s
C O NSO LE M G M T
X 13 23 X
B A S SYST
E T RPS
MSTR
STAT D PLX
SPED
STCK
X 14 24 X
M O D E
25 26 27 28
Trunk provides all VLANs
Cable: Single Mode Fiber
Plant Data Highway (PDH)
Cable: Cat5e
Unit Data Highway (UDH)
Cable: Cat5e
Mesh Root and Edges
Public Information
BLAN K
M O D U LE
Cat al y st - X Ser i e s 3750
1 2 3 4 5 6 7 8 9 10 11 12
BLAN K
M O D U LE
Cat al y st - X Ser i e s 3750
1 2 3 4 5 6 7 8 9 10 11 12
Mark VIe
Controller
Set
1 2 3 4 5 6 7 8 9 10 11 1 2 13 14 1 5 16 17 18 19 20 21 22 23 24 Catalyst 2960-S S eries
CONSOLE M G
1X 11X 13X 23X B T M
A E S
T
2X 12X 14X 24X
25 26 27 28
Catalyst 2960-S S eries
1 2 3 4 5 6 7 8 9 10 11 1 2 13 14 1 5 16 17 18 19 20 21 22 23 24
CONSOLE G M
1X 11X 13X 23X T M
B S A
E T
2X 12X 14X 24X R
25 26 27 28
S
T
Legend
Mark VIe HMIs,
Historians
Switch connector
cable located rear
Monitoring Data Highway (MDH)
connects to an OSM or RSG
Cable: Cat5e
Edge Switches
SYST
R PS
M STR STA T
DPLX
SPED
STC K
M O DE
SYST
M STR R PS
STA T
DPLX
SPED
STC K
M O DE
GEH-6721_Vol_I_BP System Guide 79
Cat al y st 2960 - S Ser i e s
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 1819 20 21 22 23 24
CO N SO LE M
G M T B A
1 X X 11 13 X 23 X
S E T
2 X X 12 14 X 24 X
25 26 27 28
Cat al y st 2960 - S Ser i e s
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 1819 20 21 22 23 24
CO N SO LE M G
M T B A
1 X 11 X 13 X 23 X
S E T
2 X X 12 14 X 24 X
25 26 27 28