Introduction To The Gre Protocol; Gre Features Supported By The S9300; Figure 2-1 Multiprotocol Local Network Communication Over Single-Protocol Backbone Network - Huawei Quidway S9300 Configuration Manual

2 GRE Configuration

2.1 Introduction to the GRE Protocol

This section describes the concept and principle of the GRE protocol.
GRE is an encapsulation mode in which packets of some network protocols such as IPX are
encapsulated and thus can be transmitted on networks supporting other protocols such as IP.
As a Layer 3 tunnel protocol for VPNs, GRE uses the tunnel technology. A tunnel interface is
equivalent to a virtual interface that supports only P2P connections. The tunnel interface provides
a channel on which data packets can be transmitted, and encapsulated and decapsulated at both
ends of the tunnel.

2.2 GRE Features Supported by the S9300

This section describes the GRE features supported by the S9300.
MultiProtocol Local Network Communication Over Single-Protocol Backbone
Network

Figure 2-1 Multiprotocol local network communication over single-protocol backbone network

As shown in
1 and Team 2 are the local networks running the IP protocol.
The tunnel between S9300-A and S9300-B adopts the GRE protocol so that Group 1 can
communicate with Group 2 without affecting the communication between Term 1 and Term 2.
2-2
Novell IPX
Group 1
S9300-A
IP
Team 1
Figure 2-1, Group 1 and Group 2 are the local networks running Novell IPX. Team
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Internet
GRE tunnel
S9300-B
Quidway S9300 Terabit Routing Switch
Configuration Guide - VPN
Novell IPX
Group 2
IP
Team 2
Issue 01 (2009-07-28)