4. Create VPN instances on PE1 and PE2. Then bind the VPN instance on PE1 to the GRE
tunnel interface, and bind the VPN instance on PE2 to the connected physical interface of
CE2.
5. Configure IS-IS routes between CE1 and PE1, and between CE2 and PE2 to implement
the interworking between the CEs and PEs.
6. Configure BGP on PEs to implement the interworking between CE1 and CE2.
Data Preparation
To complete the configuration, you need the following data:
l IP addresses of the interfaces, process ID of the routing protocol, and AS number
l Source address and destination address of the GRE tunnel
l VPN instance names, RDs, and VPN targets on PEs
Procedure
Step 1 Configure the IP address for each interface and the routing protocol for the MPLS backbone
network.
Configure OSPF10 on PE1 and PE2, and then configure MPLS and LDP. The detailed
configurations are not mentioned here.
Step 2 Configure a routing protocol between CE1, R1, and PE1.
Configure OSPF20 on CE1, R1, and PE1. The detailed configurations are not mentioned here.
Step 3 Establish a GRE tunnel between CE1 and PE1.
# Configure CE1.
[CE1] interface tunnel0/0/1
[CE1-Tunnel0/0/1] ip address 2.2.2.1 255.255.255.0
[CE1-Tunnel0/0/1] tunnel-protocol gre
[CE1-Tunnel0/0/1] source 30.1.1.1
[CE1-Tunnel0/0/1] destination 50.1.1.2
# Configure PE1.
[PE1] interface tunnel0/0/1
[PE1-Tunnel0/0/1] ip address 2.2.2.2 255.255.255.0
[PE1-Tunnel0/0/1] tunnel-protocol gre
[PE1-Tunnel0/0/1] source 50.1.1.2
[PE1-Tunnel0/0/1] destination 30.1.1.1
# After the configuration, a GRE tunnel is established between CE1 and PE1.
Step 4 Create a VPN instance named vpn1 on PE1 and bind the VPN instance to the GRE tunnel.
[PE1]ip vpn-instance vpn1
[PE1-vpn-instance-vpn1] route-distinguisher 100:1
[PE1-vpn-instance-vpn1-af-ipv4] vpn-target 111:1 export-extcommunity
[PE1-vpn-instance-vpn1-af-ipv4] vpn-target 111:1 import-extcommunity
[PE1-vpn-instance-vpn1-af-ipv4] quit
[PE1-vpn-instance-vpn1] quit
[PE1] interface tunnel0/0/1
[PE1-Tunnel0/0/1] ip binding vpn-instance vpn1
[PE1-Tunnel0/0/1] ip address 2.2.2.2 255.255.255.0
Step 5 Create a VPN instance named vpn1 on PE2 and bind the VPN instance to the GE interface.
[PE2]ip vpn-instance vpn1
[PE2-vpn-instance-vpn1] route-distinguisher 200:1
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.
33
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