Huawei AR1200 Series - Configuring the Basic System Environment

Figure 1-8 Networking diagram in which CEs access a VPN through the GRE tunnel of the
public network
PE1
PE2
CE1
CE2
R1
PC1
GE1/0/0
GE1/0/0
GE1/0/0
GE1/0/0
PC2
GE2/0/0
GE2/0/0
GE2/0/0
MPLS
Loopback1 Loopback1
GE2/0/0
GE1/0/0
GE2/0/0
T
u
n
n
e
l
Tunnel0/0/1
Tunnel0/0/1
Router Interface IP address
CE1 GE1/0/0 21.1.1.2/24
CE1 GE2/0/0 30.1.1.1/24
CE1 Tunnel0/0/1 2.2.2.1/24
R1 GE1/0/0 30.1.1.2/24
R1 GE2/0/0 50.1.1.1/24
PE1 Loopback1 1.1.1.9/32
PE1 GE1/0/0 50.1.1.2/24
PE1 GE2/0/0 110.1.1.1/24
PE1 Tunnel0/0/1 2.2.2.2/24
PE2 Loopback1 3.3.3.9/32
PE2 GE1/0/0 110.1.1.2/24
PE2 GE2/0/0 11.1.1.2/24
CE2 GE1/0/0 11.1.1.1/24
CE2 GE2/0/0 41.1.1.2/24
Configuration Roadmap
PE1 and CE1 are indirectly connected. So the VPN instance on PE1 cannot be bound to the
physical interface on PE1. In such a situation, a GRE tunnel is required between CE1 and PE1.
vpn1 on PE1 can then be bound to the GRE tunnel, and CE1 can access the VPN through the
GRE tunnel.
The configuration roadmap is as follows:
1. Configure OSPF10 on PE1 and PE2 to implement the interworking between the two
devices, and then enable MPLS.
2. Configure OSPF20 on CE1, R1, and PE1 to implement the interworking between the three
devices.
3. Establish a GRE tunnel between CE1 and PE1.
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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