Honeywell Experion LX Client Manual page 76

System Status Network tree
In this example:
Redundant servers support several Stations in the same domain topology.
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All nodes belong to the same IP multicast group using the same IP multicast address,
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which forms them into an FTE Community.
System Performance Server (SPS) should be installed on all Experion servers.
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The System Event Server is installed on only one of the redundant server pairs.
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The System Event Server scope of 'domain' (its default setting) is appropriate for this
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topology.
When there are multiple Experion servers in an FTE Community, the Distributed
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System Architecture (DSA) option should be enabled so that the servers can share SES
event data.
Each server in the FTE Community subscribes to the server hosting the SES.
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Honeywell 2017 76