http://www.rfc-editor.org/rfc/rfc2082.txt
RFC 2082: RIP-2 MD5 Authentication, F. Baker, R. Atkinson1997-01-01T23:00:00-00:00Growth in the Internet has made us aware of the need for improved authentication of routing information. RIP-2 provides for unauthenticated service (as in classical RIP), or password authentication. [STANDARDS-TRACK]