Configuring IPv6 with Cisco IOS

As you have probably already figured out, IPv6 support is still quite limited, with only three dynamic routing protocols being supported; however, this fact will change in the not-too-distant future. Cisco is currently developing its third phase of IPv6 support. The most exciting of these enhancements will be the support for two of the most widely deployed protocols in Cisco networks: OSPF and EIGRP. We ll briefly discuss these protocols in the following sections.
Open Shortest Path First has been called the premier routing protocol of its time. This distinction was made because of the feature-rich, scalable, and open-standards platform that this protocol offers. OSPF is a hierarchical, link-state protocol nature that can efficiently scale to meet the needs of any network from single sites to large multi-national corporations. Because of its open standard nature, OSPF can be used to interconnect multiple vendors equipment, and has therefore become the protocol of choice for thousands of organizations.
OSPF IPv6 support is outlined in RFC 2740. Like IS-IS and BGP, enhancements to the existing protocol, rather than an entirely new protocol, were decided for the support for IPv6. Like with BGP and IS-IS, the basic function of the protocol; that is, designated router selection, path selection, and support for areas, remains unchanged. The support for IPv6 is made possible by changes to the addressing formats, to support the new IPv6 address formats, changes to basic LSAs, and removal of authentication functions from the OSPF...