An IPv6 address is a 128-bit alphanumeric value that identifies an endpoint device in an Internet Protocol Version 6 (IPv6) network. IPv6 is the successor to a previous addressing infrastructure, IPv4, which had limitations IPv6 was designed to overcome. Notably, IPv6 has drastically increased address space compared to IPv4.
Please click the following link to view a detailed Ipv6 guide: Basics, requirements, embedding mac address in ipv6, and other things
Also check this for configuring IPV6 on cisco routers
CCNA Network Simulator available labs