http://www.rfc-editor.org/rfc/rfc1965.txt
RFC 1965: Autonomous System Confederations for BGP, P. Traina1996-06-01T23:00:00-00:00This document describes an extension to BGP which may be used to create a confederation of autonomous systems which is represented as one single autonomous system to BGP peers external to the confederation. This memo defines an Experimental Protocol for the Internet community.