Configuration Roadmap
The configuration roadmap is as follows:
1. Enable IGP on the backbone network to implement interworking between PEs, and between
PE and P so that they can learn loopback address of each other.
2. Create an MPLS LDP LSP between the PEs, create VPN instances on PEs, and connect
PEs to CEs.
3. Establish EBGP adjacencies between the PEs and CEs to import routes of the CEs to the
PEs.
4. Configure BGP ASN substitution on PEs.
Data Preparation
To complete the configuration, you need the following data:
l MPLS LSR-IDs of PE and P
l VPN instances on PE1 and PE2
l ASN used by CE1 and CE2, which is different from the ASN of the backbone network
Procedure
Step 1 Configure basic BGP/MPLS IP VPN.
The configurations are as follows:
l Configure OSPF on the MPLS backbone so that the PE and P can learn routes of the loopback
interface from each other.
l Enable MPLS capability and MPLS LDP on the MPLS backbone and establish an LDP LSP.
l Establish an MP-IBGP adjacency between PEs and advertise VPNv4 routes.
l Configure VPN instance of VPN1 on PE2 and connect PE2 to CE2.
l Configure VPN instance of VPN1 on PE1 and connect PE1 to CE1.
l Configure BGP between PE1 and CE1, and between PE2 and CE2. Import routes of the CEs
to PEs.
After the configuration, run the display ip routing-table command on CE2. You can see that
CE2 can learn the route of the network segment (10.1.1.0/24) of the interface connecting PE1
to CE1, but there is no route to VPN (100.1.1.0/24) of CE1. When you run the display ip routing-
table command on CE1, you can see the similar information.
[CE2] display ip routing-table
Route Flags: R - relied, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 10 Routes : 10
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.1.1.0/24 BGP 255 0 D 10.2.1.2 Vlanif40
10.2.1.0/24 Direct 0 0 D 10.2.1.1 Vlanif40
10.2.1.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
10.2.1.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
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
127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
200.1.1.0/24 Direct 0 0 D 200.1.1.1 Vlanif60
200.1.1.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 3 BGP MPLS IP VPN Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
205
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