http://www.rfc-editor.org/rfc/rfc3069.txt
RFC 3069: VLAN Aggregation for Efficient IP Address Allocation, D. McPherson, B. Dykes2001-02-01T23:00:00-00:00This document introduces the concept of Virtual Local Area Network (VLAN) aggregation as it relates to IPv4 address allocation. This memo provides information for the Internet community.