http://www.rfc-editor.org/rfc/rfc4726.txt
RFC 4726: A Framework for Inter-Domain Multiprotocol Label Switching Traffic Engineering, A. Farrel, J.-P. Vasseur, A. Ayyangar2006-11-01T23:00:00-00:00For the purposes of this document, a domain is considered to be any collection of network elements within a common sphere of address management or path computational responsibility. Examples of such domains include Interior Gateway Protocol (IGP) areas and Autonomous Systems (ASes). This memo provides information for the Internet community.