<Huawei> display ip routing-table vpn-instance
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: vpn1
Destinations : 3 Routes : 3
Destination/Mask Proto Pre Cost Flags NextHop Interface
1.1.1.0/24 Direct 0 0 D 1.1.1.1 Ethernet2/0/0
1.1.1.1/32 Direct 0 0 D 127.0.0.1 Ethernet2/0/0
5.5.5.0/24 Static 60 0 RD 1.1.1.2 Ethernet2/0/0
3.7 Configuring Inter-AS VPN Option B
In inter-AS VPN Option B through MP-EBGP, two ASBRs receive VPNv4 routes from PEs in
their respective ASs and exchange the VPNv4 routes with each other.
3.7.1 Establishing the Configuration Task
Before configuring inter-AS VPN OptionB, familiarize yourself with the applicable
environment, complete the pre-configuration tasks, and obtain the required data. This can help
you complete the configuration task quickly and accurately.
Applicable Environment
If the MPLS backbone network bearing VPN routes crosses multiple ASs, the inter-AS VPN is
needed.
If the ASBR can manage VPN routes, but there are not enough interfaces for each inter-AS VPN,
the inter-AS VPN Option B is adopted. In this option, the ASBR is involved in maintaining and
advertising VPN IPv4 routes.
Pre-configuration Tasks
Before configuring inter-AS VPN Option B, complete the following tasks:
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 VPN Instances 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 B, you need the following data.
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.
96
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