http://www.rfc-editor.org/rfc/rfc5316.txt
RFC 5316: ISIS Extensions in Support of Inter-Autonomous System (AS) MPLS and GMPLS Traffic Engineering, M. Chen, R. Zhang, X. Duan2008-12-01T23:00:00-00:00No support for flooding information from within one AS to another AS is proposed or defined in this document. [STANDARDS-TRACK]