As you start to look into the IPv6 integration process, you will need to look at what is in place in the network and then assess capabilities. The assessment process is about discovering capabilities of the existing equipment, services and applications. The result of the assessment process will give you an idea of what has to be done to ensure that the desired IPv6 features are supported.
A good starting point for the assessment phase is to analyze your infrastructure for basic IPv6 services. Can I configure an IPv6 address on the device? Does it support neighbor discovery and ICMPv6? The question you are trying to answer is “What are the minimum features I absolutely need to get IPv6 up and running?”