Source and destination devices of an IPv6 over IPv4 tunnel must have forwarding routes.
Before configuring an IPv6 over IPv4 tunnel, complete the following tasks:
Configure the IPv4/IPv6 dual stack. For details, see Configuring the IPv4/IPv6 Dual Stack.
(Optional) Enable the service loopback function on an Eth-Trunk. For details, see Enabling the Service Loopback Function on an Eth-Trunk.
IPv6 over IPv4 Tunnel has the following three modes, the tasks are independent of each, and you can select one task according to service requirements.