From CCIE Study Wiki

OSPFv3 is the most recent version of the commonly used OSPF routing protocol and supports IPv6 dynamic routing.

Theory

OSPFv3 differences from OSPFv2:

• Configured using interface-level commands
• With an IPv6 interface possibly having multiple IP address, OSPFv3 will advertise all all of the corresponding networks.
• Must set the OSPFv3 RID
• Scope of flooding - An LSA can be link-local scoped (limited to a single network), area scoped (limited to a single area), or AS scoped (flooded throughout the OSPFv3 domain)
• Multiple instances per link - couple be used on a multiaccess network to prevent all routers from becoming adjacent automatically.
• Authentication - no native authentication like OSPFv2, instead relies on IPv6 built-in support for IpSec AH and ESP protocols.
• Source IP determination - OSPFv3 uses link local addresses for source IPs in OSPFv3 communications, except when using virtual-links.
• The term link in OSPFv3 is used instead of the v2 network term.

LSA functionality is mostly the same. However, there are two new LSA types in v3, and some of the terminology is different. LSA types:

• 1 - Router LSA - Describes a router's link and costs of its link to one area. Area scoped.
• 2 - Network LSA - Generated by DR to describe the aggregated link state and costs for all routers in the area. Area scoped.
• 3 - Inter-Area Prefix LSA - Originated by ABRs to describe inter-area networks to routers in other areas. Area scoped.
• 4 - Inter-Area Router LSA - Originated by ASBRs to advertise the ASBR location. Area scoped.
• 5 - AS External LSA - Originated by ASBRs to describe redistributed routes. AS scoped.
• 8 - new Link LSA - Advertises link-local address and prefix(es) of a router to all other routers on a link; only sent if there is more then one router on a link. Link scoped.
• 9 - new Intra-Area Prefix LSA - Either associates a list of IPv6 prefixes with a transit network by pointing to a Network LSA OR assoc associates a list of IPv6 prefixes with a router by pointing to a Router LSA. Area scoped.

Commands

• ipv6 ospf process-id area area-id (interface) - activates OSPFv3 on a specific interface and sets the area
• ipv6 ospf neighbor ipv6-address [priority number] [poll-interval seconds] [cost number] (interface) - specifies an OSPFv3 neighbor and sets parameters
• ipv6 router ospf process-id - enter OSPFv3 config mode

Default Settings

• Nothing listed yet

Verification

• Nothing listed yet

Troubleshooting, Tips, and Tricks

• When configuring OSPFv3 over frame relay and using frame-relay map commands, you need to configure map commands for BOTH the link-local and unicast address of the next-hop interface.

Online Resources

• Cisco configuration guide for OSPFv3.

• Cisco Learning Module presentation on using IPv6 with OSPF and other routing protocols (must be registered to view).

• CCIE To Be shows how OSPFv3 neighbors do not need to be on the same subnet and summarizes OSPFv3 addresses.

• Jeff Doyle discusses the theory behind the OSPFv3 new LSA.

• A look at OSPFv3 and EIGRPv6 from Route Reflections.

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