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
Internet
S9300-B
IP
Team 2
Novell IPX
Group 1
IP
Team 1
GRE tunnel
S9300-A
Group 2
Novell IPX
As shown in Figure 2-1, Group 1 and Group 2 are the local networks running Novell IPX. Team
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 GRE Configuration
Quidway S9300 Terabit Routing Switch
Configuration Guide - VPN
2-2 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 03 (2009-08-20)
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