http://www.rfc-editor.org/rfc/rfc6969.txt
RFC 6969: OSPFv3 Instance ID Registry Update, A. Retana, D. Cheng2013-07-01T23:00:00-00:00This document modifies the "Unassigned" number space in the IANA "OSPFv3 Instance ID Address Family Values" registry by dividing it in two halves -- one half Unassigned but managed via Standards Action, and the other Reserved for Private Use. It updates RFC 5838.