In June 2000, Cisco Systems announced an IPv6 roadmap in 3 phases as described in Cisco IOS IPv6 Statement of Direction (PDF).
In May 2001, the availability of IPv6 features in Cisco IOS Software across the widest breadth of platforms in the industry marked the completion of Cisco IOS IPv6 Phase I (PPT).
In December 2001, the Cisco IOS IPv6 Phase II (PPT) announcement enhanced the IPv6 feature set as well as added support for the Cisco 12000 series. Today, Cisco IOS IPv6 Phase III is an on-going effort. Deliverables such as OSPFv3, IPv6 QoS and others are already released, while DHCPv6 Prefix Delegation, IPv6 Multicast, NAT-PT enhancements and others will be available soon on upcoming Cisco IOS releases.
In May 2003, the availability of Cisco IOS 12.3 Mainline that integrates the IPv6 feature set from 12.2(15)T enables production deployment for all Cisco based networks. With advanced functionality such as Multi-Topology IS-IS for IPv6, IPv6 Provider Edge over MPLS (6PE) support and Broadband Access feature set for IPv6 as part of its offering, Cisco delivers the industry's most mature IPv6 solution. This solution now enables large-scale deployment of applications such as peer-to-peer and home networking services, which require the universal addressing capability of IPv6.
>> More IPv6 Information 
(All IP Version 6 (IPv6) Technology Briefs)
(PDF - 310 KB)Implementing IPv6 Networks
(PDF - 16 KB)Multi-Protocol BGP and IPv6
(PDF - 410 KB)(All IP Version 6 (IPv6) Technology White Paper)
(All IP Version 6 (IPv6) Security Advisories, Responses and Notices)
