Sel 411L - Figure 3.189 Isolated Redundant Network Topology with Star Configuration and a Ring Topology with Dedicated, Managed Switches between Substations; Figure 3.190 Redundant Isolated Ring-Connected Network with Dedicated, Managed Switches

P.3.277
Date Code 20151029 Protection Manual SEL-411L Relay
Protection Functions
87L Communication and Timing
switch to prioritize traffic, which may involve factors such as VLAN settings,
root bridge selection (bridge priority settings), port priority settings and port
path cost settings.
Figure 3.189 shows an example of an engineered redundant network topology
with star configuration and engineered switches. This architecture eliminates
single point of failure at the relay Ethernet interface, local switch interface,
local switch, and any of the cabling.
Figure 3.189 Isolated Redundant Network Topology With Star Configuration and a Ring Topology With Dedicated,
Managed Switches Between Substations
Figure 3.190 shows a redundant ring-connected topology connected in fail-
over mode. This topology also requires managed switches with rapid spanning
tree protocol (RSTP) to support redundancy. The redundant connections
provide you the benefit of being able to connect each SEL-411L Ethernet port
to an individual switch.
Figure 3.190 Redundant Isolated Ring-Connected Network With Dedicated, Managed Switches
Figure 3.191 shows an alternative ring-connected topology. This architecture
reduces cables and switches but loses redundancy in the local switch. With a
ring topology, you need managed switches with appropriate settings enabled,
such as RSTP provides.
Station A
SEL-411L
IRIG-B
Switch Switch
Station B
SEL-411L
IRIG-B
Switch Switch
Station C
SEL-411L
IRIG-B
Switch Switch
Station D
SEL-411L
IRIG-B
Switch Switch
Station A
SEL-411L
IRIG-B
Switch Switch
Station B
SEL-411L
IRIG-B
Switch Switch
Station C
SEL-411L
IRIG-B
Switch Switch
Station D
SEL-411L
IRIG-B
Switch Switch