Huawei AR1200 Series - Debugging GRE; Configuration Examples; Example for Configuring a Static Route for GRE

Procedure
l Run the display interface tunnel [ interface-number ] command to check the tunnel
interface running status.
l Run the display ip routing-table vpn-instance vpn-instance-name command to check the
VPN routing table on the PE.
l Run the display ip routing-table command to check the routing table on the CE.
l Run the ping [ -a source-ip-address | -vpn-instance vpn-instance-name ]
*
host command
to check whether the two ends of the tunnel can communicate with each other.
----End
1.6.3 Debugging GRE
When a GRE fault occurs, you can run the L2TP related debugging commands to debug GRE
and locate the fault.
Context
NOTE
The debugging process affects system performance. Therefore, after finishing the debugging process, run
the undo debugging all command immediately to disable the debugging.
When GRE goes abnormal, run the debugging commands in the user view to view debugging
information, locate the fault, and analyze the cause.
Procedure
l Run the debugging tunnel keepalive command in the user view to debug the Keepalive
function of the GRE tunnel.
----End
1.7 Configuration Examples
Familiarize yourself with the configuration procedures against the networking diagrams. This
section provides networking requirements, configuration notes, and configuration roadmap in
configurations examples.
1.7.1 Example for Configuring a Static Route for GRE
This section provides an example for configuring a static route for GRE. In this networking,
traffic between users is transmitted through a GRE tunnel; a static route is configured between
the device and its connected client.
Networking Requirements
In Figure 1-5, Router A, Router B, and Router C belong to the VPN backbone network and
OSPF runs between them.
GRE is enabled between Router A and Router C to achieve interworking between PC 1 and PC
2.
PC1 takes Router A as its default gateway, and PC2 takes Router C as its default gateway.
Huawei AR1200 Series Enterprise Routers
Configuration Guide - VPN 1 GRE Configuration
Issue 01 (2012-04-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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