Subscriber services: Collect service statistics in local file

You can configure flat-file accounting to collect service statistics for subscribers and report those statistics to a local file. This configuration collects the running total service statistics per interface family. Because the statistics are maintained in the Routing Engine in a statistics database, they are not affected by a line-card restart, a graceful Routing Engine switchover, or a unified in-service software upgrade (ISSU). The statistics counters are reset when the router reboots.