Assign an IP address to each interface as shown in Figure 1-5. The specific configuration is not
mentioned here.
Step 2 Configure IGP for the VPN backbone network.
# Configure Router A.
[RouterA] ospf 1
[RouterA-ospf-1] area 0
[RouterA-ospf-1-area-0.0.0.0] network 20.1.1.0 0.0.0.255
[RouterA-ospf-1-area-0.0.0.0] quit
[RouterA-ospf-1] quit
# Configure Router B.
[RouterB] ospf 1
[RouterB-ospf-1] area 0
[RouterB-ospf-1-area-0.0.0.0] network 20.1.1.0 0.0.0.255
[RouterB-ospf-1-area-0.0.0.0] network 30.1.1.0 0.0.0.255
[RouterB-ospf-1-area-0.0.0.0] quit
[RouterB-ospf-1] quit
# Configure Router C.
[RouterC] ospf 1
[RouterC-ospf-1] area 0
[RouterC-ospf-1-area-0.0.0.0] network 30.1.1.0 0.0.0.255
[RouterC-ospf-1-area-0.0.0.0] quit
[RouterC-ospf-1] quit
After the configuration, run the display ip routing-table command on Router A and Router C.
You can find that they both learn the OSPF route to the network segment of the remote interface.
Take Router A as an example.
[RouterA] display ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 8 Routes : 8
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.1.1.0/24 Direct 0 0 D 10.1.1.2
GigabitEthernet2/0/0
10.1.1.2/32 Direct 0 0 D 127.0.0.1 InLoopBack0
20.1.1.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
30.1.1.0/24 OSPF 10 2 D 20.1.1.2
GigabitEthernet1/0/0
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
Step 3 Configure the tunnel interface.
# Configure Router A.
[RouterA] interface tunnel 0/0/1
[RouterA-Tunnel0/0/1] ip address 40.1.1.1 24
[RouterA-Tunnel0/0/1] source 20.1.1.1
[RouterA-Tunnel0/0/1] destination 30.1.1.2
[RouterA-Tunnel0/0/1] quit
# Configure Router C.
[RouterC] interface tunnel 0/0/1
[RouterC-Tunnel0/0/1] ip address 40.1.1.2 24
[RouterC-Tunnel0/0/1] source 30.1.1.2
[RouterC-Tunnel0/0/1] destination 20.1.1.1
[RouterC-Tunnel0/0/1] quit
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.
19
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