"Also known as simple persistence, source address affinity persistence supports TCP and UDP protocols and directs session requests to the same server based solely on the source IP address of a packet.
The DNS-based load balancing is going to essentially send agents to their servers in a round-robin fashion: Agent 1 => Server 1, Agent 2 => Server 2, etc. If Server 1 isn't available, Agent 1 goes to Server 2, etc. If all but one Server fails, all Agents will go over to the available Server - 3, 4, 5, etc., until previous Servers are back online. After which, DNS will again assign Agent 1, 2, etc., to servers in order available => Server 1, 2, etc.
Ping times (via Load Balancer like F5) can determine how quickly new connections can go to the newly available servers.
Presumably Endpoints will have a choice of 2 Servers (internal vs external), but otherwise - as noted above, all the "work" of load balancing is done by the LB implementation (e.g., F5, etc.)
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