Method used to configure an IPSec tunnel on the AR for mutual access between branches

There are two ways of implementing communication between branches on Huawei AR routers.
1. Branches directly communicate with each other. In this case, implementing communication between branches through configuration of IPSec and DSVPN (not supported by the AR510). For details, see "Example for configuring IPSec-based DSVPN" of "DSVPN Configuration" in Configuration Guide - VPN.
2. Branches communicate with each other through the headquarters. For details, see "Example for Configuring GRE Over IPSec to Implement Communication Between the Branches and Headquarters and NAT to Implement Communication Between Branches (Running OSPF)" of "Using VPN to Implement WAN Interconnection" in Typical Configuration Examples.

Other related questions:
Method used to configure IPSec between the headquarters and branches on the AR
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