http://www.rfc-editor.org/rfc/rfc5103.txt
RFC 5103: Bidirectional Flow Export Using IP Flow Information Export (IPFIX), B. Trammell, E. Boschi2008-01-01T23:00:00-00:00This document describes an efficient method for exporting bidirectional flow (Biflow) information using the IP Flow Information Export (IPFIX) protocol, representing each Biflow using a single Flow Record. [STANDARDS-TRACK]