Before configuring IPv6 addresses for interfaces, you have completed the following tasks:
Connect interfaces and configure physical parameters for the interfaces to ensure that the physical status of the interfaces is up.
Configure link layer protocol parameters for the interfaces to ensure that the link layer protocol status of the interfaces is up.
To enable an interface to forward IPv6 packets, enable IPv6 in both the system view and interface view. You can perform IPv6-related configurations on an interface only after IPv6 is enabled in the interface view.
system-view
ipv6
interface interface-type interface-number
ipv6 enable
quit