Ring And Star Topology; Ring Topology - ABB Relion 650 Series Communication Protocol Manual

Section 9
Rapid spanning tree protocol (RSTP)
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IEC21000009 V1 EN-US
Figure 14:
9.4.2

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.
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IEC21000005 V1 EN-US
Figure 15:
9.4.3

Ring topology

In ring topology, IEDs and switch are connected to form a ring. Ring is the most preferred topology
with RSTP. In
44
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
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Sw2
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1MRK 511 415-UEN Rev. F
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IEC 61850 Edition 2, 650 series
Communication protocol manual