4.8.1 Establishing the Configuration Task
Before configuring inter-AS IPv6 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-IPv6 routes crosses multiple ASs, the inter-AS
VPN is needed. If the ASBR can manage VPN-IPv6 routes, however, there are no enough
interfaces for each inter-AS IPv6 VPN, the inter-AS VPN-Option B is adopted. In this option,
the ASBR is involved in maintaining and advertising VPN-IPv6 routes.
Pre-configuration Tasks
Before configuring inter-AS IPv6 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 for the MPLS backbone network
l Configuring MPLS LDP to establish LDP LSP for the MPLS backbone network
l 4.3.2 Creating an IPv6 VPN Instance on the PE devices connected with the CE devices
and 4.4.3 Binding an Interface to an IPv6 VPN Instance
l Configuring the IPv6 addresses of the CE interfaces through which the CE accesses the PE
Data Preparation
To configure inter-AS IPv6 VPN-Option B, you need the following data.
No.
Data
1 To configure the IPv6 VPN instance on the PE, you need the following data:
l Name of the IPv6 VPN instance
l (Optional) Description of the IPv6 VPN instance
l RD, VPN Target
l (Optional) Routing policy that controls the receiving and sending of IPv6 VPN
routes
l (Optional) he maximum number of routes allowed by the IPv6 VPN instance
2
IPv6 addresses of the PE interfaces attached to the CE
3 AS number of the PE
4 IPv4 addresses of the interfaces connected the ASBRs
5 Routing protocol adopted between the PE and the CE: static route, RIPng, IS-ISv6
or BGP4+
6 IPv4 addresses and interfaces setting up the MP-IBGP peer between the PE and the
ASBR
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 4 BGP MPLS IPv6 VPN Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
354
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