Unlike a Cold Standby APIC, which remains inactive and holds no data until it is promoted to active, a Warm Standby APIC continuously synchronizes data from the active APIC nodes while remaining in standby mode. This ongoing synchronization ensures that, in the event of data loss across the APIC cluster, the Warm Standby can be used to restore the cluster, even if parts of the distributed database are permanently lost.
Note - From 6.1(2), standby APIC can be setup as Warm standby APIC.
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