When creating a Cloud Edge HA group, one interface on each HA peer is
designated as the heartbeat interface. This interface is chosen during HA group creation.
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The heartbeat interface must be an L3 interface.
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The heartbeat interface must use the same interface on each gateway (for example: LAN2-to-LAN2 or LAN3-to-LAN3).
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The two heartbeat interfaces must be connected directly to each other (not through a switch).
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Heartbeat interfaces cannot be used for other purposes, such as LAN traffic interfaces.
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You must configure IPv4 addresses and netmasks for the heartbeat interfaces and the IPv4 addresses must be on the same subnet.
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After an interface has been selected as a heartbeat interface, you cannot change the configuration of that interface, including gateway IP addresses.
Managing a Split-brain Condition
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Because Cloud Edge uses only one interface for the HA group heartbeat, issues with the heartbeat connection might cause an condition known as the split-brain problem. Cloud Edge must be able to handle this condition.
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Split-brain: A split-brain condition is the result of a cluster partition, where each side believes the other is dead, and then proceeds to take over resources as though the other side no longer owns any resources.