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CLI-based Configuration Guide - VPN

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document describes VPN features on the device and provides configuration procedures and configuration examples.
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Overview of GRE

Overview of GRE


Generic Routing Encapsulation (GRE) is a protocol that encapsulates packets of some network layer protocols, such as Internetwork Packet Exchange (IPX), Asynchronous Transfer Mode (ATM), IPv6, and AppleTalk. Then the encapsulated packets can be transmitted over a different network layer protocol, such as IPv4.

As Layer 3 tunneling technology, GRE encapsulates packets of a protocol into packets of another protocol to transparently transmit packets over GRE tunnels. This technology enables packet transmission on heterogeneous networks.


  • GRE is easy to implement and increases only a few loads on devices at both ends of a tunnel.

  • GRE sets up tunnels over an IPv4 network to connect networks running different protocols, using the original network structure and reducing costs.

  • GRE enlarges the operation scope of network protocols that support limited hop counts, allowing for flexible topologies on enterprise networks.

  • GRE can encapsulate multicast data and work with IPSec to ensure security of multicast services such as voice and video services.

  • GRE can work with Multiprotocol Label Switching (MPLS) Label Distribution Protocol (LDP). MPLS LDP packets are transmitted over GRE tunnels to set up LDP label switched paths (LSPs), so that MPLS backbone networks can be connected through a heterogeneous network.

  • GRE connects discontiguous subnets and sets up virtual private networks (VPNs) to ensure secure connections between the enterprise headquarters and branches.

Updated: 2019-08-07

Document ID: EDOC1100033725

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