http://www.rfc-editor.org/rfc/rfc5340.txt
RFC 5340: OSPF for IPv6, R. Coltun, D. Ferguson, J. Moy, A. Lindem2008-07-01T23:00:00-00:00All of OSPF for IPv4's optional capabilities, including demand circuit support and Not-So-Stubby Areas (NSSAs), are also supported in OSPF for IPv6. [STANDARDS-TRACK]