Establishing IPSec Tunnels in Virtual Tunnel Interface Mode Between HUAWEI Firewalls and HUAWEI AR Routers - HUAWEI USG Series Firewalls Interoperability Configuration Guide for VPN - Huawei
Passing non-IP Traffic over IPSEC VPN using GRE over IPSEC
LAN-to-LAN IPsec Tunnel Between Two Routers Configuration Example - Cisco
Example for Configuring the Headquarters (Cisco Router) to Manage Branches Using Efficient VPN and Establishing IPSec Tunnels - AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 CLI-based Typical Configuration Examples -
Configuring Site to Site IPSec VPN Tunnel Between Cisco Routers