3.4.b Describe RIPv6 [RIPng]

RIPv6 Routing Information Protocol (RIP) functions the same and offers the same benefits as IPv4 RIP v2. RIP enhancements for IPv6, detailed in RFC 2080, include support for IPv6 addresses and prefixes and the use of the all-RIP-devices multicast group address, FF02:: 9, as the destination address for RIP update messages.

RIPng sends updates on UDP port 521 using the multicast group FF02:: 9.

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 2963-2966).  . Kindle Edition.

http://www.tcpipguide.com/free/t_RIPngRIPv6MessageFormatandFeatures.htm