Synchronization frequency is configurable per diameter application policy and the minimum configurable value is five minutes. This interval is maintained per each individual Gx session associated with the relevant diameter application policy.
The configured synchronization interval governs the accuracy of UM in dual-homed systems where the switchover is caused by the sudden unavailability (crash, reboot, and so on) of the node on which a UM session is active.
Online configuration changes (while UM sessions are active) for synchronization interval are activated only for the new sessions that are established after the configuration is made.