Indication delivery retry

To improve the reliability of indication delivery, DMTF Indications Profile DSP1054 1.1 introduces sequence identifiers. Sequence identifiers flag the order of deliveries. This makes indication delivery more reliable, because the CIM server can retry unsuccessful deliveries, and a CIM listener can detect lost and duplicate deliveries and reorder indications arriving out of order.

Indication delivery is based on a publish/subscribe event paradigm, where a CIM server delivers indications to subscribed WBEM listeners.

If the attempt of a WBEM server to deliver an indication to a WBEM listener fails, the service retries the delivery. For this, the number of delivery retry attempts and the minimum delivery retry interval are specified (with the DeliveryRetryAttempts and DeliveryRetryInterval properties of the appropriate CIM_IndicationService instance associated with the CIM_IndicationFilter or CIM_FilterCollection instance). Each sequence identifier has a lifetime, which is the number of delivery retry attempts multiplied by the minimum delivery retry interval multiplied by 10.

The indication is not delivered to the listener, if the number of retry attempts or the lifetime of the sequence identifier is exceeded.

For more information, see DMTF Indications Profile DSP1054 1.1.