Chapter 2 Advanced Routing for FortiOS 5.0 : Dynamic Routing Overview : IPv6 in dynamic routing
  
IPv6 in dynamic routing
Unless otherwise stated, routing protocols apply to IPv4 addressing. This is the standard address format used. However, IPv6 is becoming more popular and new versions of the dynamic routing protocols have been introduced.
Dynamic routing supports IPv6 on your FortiGate unit. The new versions of these protocols and the corresponding RFCs are:
RIP next generation (RIPng) — RFC 2080 - Routing Information Protocol next generation (RIPng). See “RIP and IPv6”.
BGP4+ — RFC 2545, and RFC 2858 Multiprotocol Extensions for IPv6 Inter-Domain Routing, and Multiprotocol Extensions for BGP-4 (MP-BGP) respectively. See “BGP and IPv6”.
OSPFv3 — RFC 2740 Open Shortest Path First version 3 (OSPFv3) for IPv6 support. See “OSPFv3 and IPv6”.
Integrated IS-IS — RFC 5308 for IPv6 support. See “Integrated IS-IS”.
As with most advanced routing features on your FortiGate unit, IPv6 settings for dynamic routing protocols must be enabled before they will be visible in the GUI. To enable IPv6 configuration in the GUI, enable it in System > Admin > Settings. Alternatively, you can directly configure IPv6 for RIP, BGP, or OSPF protocols using CLI commands.