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Configuration Guide - VPN

S9300, S9300E, and S9300X V200R010C00

This document describes the VPN configuration procedures and provides configuration examples.
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Generic Routing Encapsulation (GRE) is a protocol that encapsulates packets of some network layer protocols, such as Internetwork Packet Exchange (IPX), IPv6, and AppleTalk. GRE allows encapsulated packets to be transmitted through a different network layer protocol, such as IPv4.

As a Layer 3 tunneling technology, GRE encapsulates packets of one protocol into packets of another protocol and transparently transmits them over tunnels. This 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, reusing 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 connects discontiguous subnets and sets up virtual private networks (VPNs) to ensure secure connections between enterprise headquarters and branches.

Updated: 2019-08-21

Document ID: EDOC1000142068

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