Huawei Quidway S9300

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 : 8 Routes : 8
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
10.2.1.2/32 Direct 0 0 D 10.2.1.2 Vlanif40
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
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
Run the display ip routing-table vpn-instance command on PEs, and you can see the routes
to the VPNs of the peer CEs.
Take PE2 for example.
[PE2] display ip routing-table vpn-instance vpn1
Route Flags: R - relied, D - download to fib
------------------------------------------------------------------------------
Routing Tables: vpn1
Destinations : 7 Routes : 7
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.1.1.0/24 BGP 255 0 RD 1.1.1.9 Vlanif30
10.2.1.0/24 Direct 0 0 D 10.2.1.2 Vlanif40
10.2.1.1/32 Direct 0 0 D 10.2.1.1 Vlanif40
Quidway S9300 Terabit Routing Switch
Configuration Guide - VPN 3 BGP/MPLS IP VPN Configuration
Issue 03 (2009-08-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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