AA uses the existing redundant accounting and logging capability of the 7750 SR and 7450 ESS for sending application and subscriber usage information, in-band or out-of-band. AA statistics are stored using compressed XML format with other system and subscriber statistics in compact flash modules on the redundant SF/CPMs. A large volume of statistics can be expected under scaled scenarios when per-AA subscriber statistics/accounting is enabled.
AA accounting and statistics can be deployed as part of other system functionality as long as the system’s function is compatible with AA accounting or as long as the system-level statistics can become application-aware because of, for example, AA ISA-based classification. An example of this feature interaction includes volume and time-based accounting where AA-based classification into IOM queues with volume and time accounting enabled can, for instance, provide different quota/credit management for off-net and on-net traffic or white/grey applications.