To find documentation for a specific Cisco router, go to the Routers page on the Cisco website. Next, scroll down the list to find a specific model number. To find documentation for a specific Cisco layer-3 switch go to the Switches page on the Cisco website. Next, scroll down the list to find a specific model number.
A complete reference with numerous examples and detailed explanations of specific IOS configuration options for all Cisco routers and layer-3 switches is available on the Cisco IOS IPv6 Command Reference page on the Cisco website. An IPv6-specific Frequently Asked Questions (FAQ) file is maintained by Cisco. Cisco maintains a Small Business Support Community for its equipment.
Configuration information for Dynamic Host Configuration Protocol version 6 (DHCPv6) may be found here.