Ring And Star Topology; Ring Topology - ABB Relion SAM600 Communication Protocol Manual

Section 8
Rapid spanning tree protocol (RSTP)
IED IED
IEC21000009 V1 EN-US
Figure 14:
8.4.2

Ring and star topology

In ring and star topology, switches are connected in ring and devices are connected in star topology.
The IED is connected to two different switches. Switch Sw1 (or Sw2) should be configured as the
root bridge.
In this case, all the IEDs will communicate with Sw1; only in case of a link failure or other failure in
the switch Sw1 the redundant link via Sw2 will be activated.
IED IED
IEC21000005 V1 EN-US
Figure 15:
8.4.3

Ring topology

In ring topology, IEDs and switch are connected to form a ring. Ring is the most preferred topology
with RSTP. In
38
Sw1, root bridge
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Main link
Backup link
Star topology
Sw3
Sw1, root bridge
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Main link
Backup link
Ring and star topology
Figure 16, switch Sw1 is the root bridge, if the priority of Sw2 is greater than that of the
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Sw2
IED IED IED IED
Sw2
IED IED IED IED
1MRK 511 441-UEN Rev. C
GUID-2EC678AE-F26E-4999-80AF-5725B6D6DEDB v1
GUID-2035405C-3BA7-4360-B4A0-CB5ECCE5EE15 v1
Switchgear control unit SAM600-IO
Communication protocol manual