The SD-WAN rule’s preferred member is determined by packet loss comparison. As the documentation details:
"If all three SD-WAN members exhibit the same packet loss percentage, the preferred member can change according to secondary criteria such as cost, latency, or manual priority. However, if one member—such as HUB1-VPN3—matches the packet loss of other members, it can become the new preferred member as determined by the load balancing algorithm or fallback rules."
This behavior ensures fair utilization and redundancy.
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