Site-to-Site VPN between Fortigate and Huawei

Hello,

I have been tasked to create a site-to-site vpn connection between a Fortigate 90D and a Huawei AR1220, which I do not get to work.

The main problems seems to t obe, that the Huwawei, when usieng a logical vpn-interface and tunnel mode uses some sort of transfer network to move network traffic between the two networks.

Does anybody have experience with this setup or posess a step by step guide to achieve this ?

Zhank you very much in advance.

Regards

Tobias