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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Introduction to GRE

Introduction to GRE

This section describes the definition and benefits of GRE.

Definition

Generic Routing Encapsulation (GRE) is a protocol that encapsulates packets of some network layer protocols, such as Internetwork Packet Exchange (IPX), 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.

Benefits

  • 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.

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Updated: 2019-08-09

Document ID: EDOC1000041694

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