Data Preparation
To configure inter-AS IP VPN Option A, you need the following data:
No. Data
1 To configure the VPN instance on the PE and the ASBR PE, you need the following
data:
l Name of the VPN instance
l Route distinguisher
l Description of the VPN instance
l VPN target
l (optional) Routing policy
l (optional) Tunnel policy
l (optional) Maximum number of route permitted in a VPN instance
2
IP address of the PE interface connected with the PE
3 AS number of the PE
4 IPaddresses of the interfaces connected the ASBR PEs
5 Routing protocol configured between the PE and the CE: static route, RIPng, IS-ISv6
or BGP4+
6 IP addresses and interfaces between the PE and ASBR PE to establish the MP-IBGP
peers
3.6.2 Configuring Inter-AS VPN Option A
Context
Inter-AS VPN Option A is easy to deploy. When the amount of the VPNs and the VPN routes
on the PE is small, this solution can be adopted.
Procedure
Step 1 3.4 Configuring Basic BGP/MPLS IP VPN on each AS.
Step 2 Configuring ASBR-PE by considering the peer ASBR-PE as its CE.
Step 3 Configuring VPN instances for the PE and the ASBR-PE separately.
The VPN instance for PE is used to access CE; that for ASBR-PE is used to access its peer
ASBR-PE.
NOTE
In inter-AS VPN Option A mode, for the same VPN, the VPN targets of ASBR-PE and the PE VPN instance
must be matched in an AS. This is not required for the PEs in different ASs.
----End
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.
3-29
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