Configuring a Source Interface for an IPv4 over IPv6 Tunnel

You can only specify a loopback interface as the source interface for an IPv4 over IPv6 tunnel interface and use it to communicate with other devices because a loopback interface stays in the Up state after being created.

Procedure

Run system-view
The system view is displayed.
Run interface loopback loopback-number
A loopback interface is created.
(Optional) Run ip binding vpn-instance vpn-instance-name
A VPN instance is bound to the loopback interface.

In VPN scenarios, the loopback interface must be bound to the VPN instance to which the device belongs.
Run ipv6 enable
IPv6 is enabled on the interface.
Run ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length }
An IPv6 address is configured for the loopback interface.
Run binding tunnel ipv4-ipv6
IPv4 over IPv6 is enabled on the loopback interface.
Run commit
The configuration is committed.