Huawei AR1200 Series Configuration Guide

l Configuring IGP for MPLS backbone networks in each AS to realize IP connectivity of the
backbones in one AS
l Configuring basic MPLS capability and MPLS LDP for the MPLS backbone network
l Configuring the IBGP peer relationship between the PE and ASBR in the same AS
l Configuring a VPN Instance on the PE devices connected with the CE devices and Binding
an Interface with a VPN Instance
l Configuring the IP addresses of the CE interfaces through which the CE accesses the PE
Data Preparation
To configure inter-AS VPN Option C, you need the following data:
No. Data
1 Data for configuring a VPN instance on the PE and ASBR:
l Name of the VPN instance
l (Optional) Description of the VPN instance
l RD, VPN target attribute of the VPN instance IPv4 address families
l Routing policy for controlling the import and export of VPN routes
l (Optional) Maximum number of routes permitted in the VPN instance IPv4
address families
2
IP address of the PE interface connected with the CE
3 AS number of the PE
4 IP addresses of the interfaces connected the ASBRs
5 Routing policy configured on the ASBR
6 Routing protocol configured between the PE and CE: static routes, RIP, OSPF, IS-
IS, or BGP
7 IP addresses and interfaces setting up the IBGP peer between the PE and ASBR
NOTE
In inter-AS VPN-Option C, do not enable LDP between ASBRs.
If LDP is enabled on the interfaces between ASBRs, LDP sessions are then established between the ASBRs.
In this case, the ASBRs establish an egress LSP and send Mapping messages to the upstream ASBR. After
receiving Mapping messages, the upstream ASBR establishes a transit LSP. When there are high-volume
BGP routes, enabling LDP on the interfaces between ASBRs leads to the occupation of a large number of
LDP labels.
3.8.2 Enabling the Labeled IPv4 Route Exchange
In inter-AS VPN Option C, a BGP LSP needs to be established between ASs, and labeled IPv4
routes need to be exchanged between BGP peers.
Huawei AR1200 Series Enterprise Routers
Configuration Guide - VPN 3 BGP MPLS IP VPN Configuration
Issue 01 (2012-04-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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Huawei AR1200 Series Specifications

General

Brand	Huawei
Model	AR1200 Series
Category	Network Router
Language	English