4.2 BGP/MPLS IPv6 VPN Features Supported by the S7700
This part describes the basic networking, typical networking, and reliability of BGP/MPLS IP
VPN supported by the S7700.
Basic Networking
The S7700 supports the VPN route exchange between PEs through MP-IBGP. To ensure that a
PE and a CE can exchange routes, you can configure the static route, RIPng multi-instance, IS-
IS multi-instance, or BGP4+. The S7700 uses VPN targets to control the transmission of VPN
routes; thus, multiple VPN networking topologies.
Generally, LSPs or MPLS TE tunnels are configured as the tunnels of VPN backbone networks.
If PEs support MPLS functions and Ps support IP functions rather than MPLS functions, GRE
tunnels can be configured.
Reliability
To improve the reliability of a VPN, generally, the following networking modes are adopted.
l
The backbone network is an MPLS network, on which the devices adopt hierarchical
backup and are fully connected through high-speed interfaces. If the number of PEs is large,
use the BGP route reflector to reflect IPv6 VPN routes to decrease the number of MP IBGP
connections.
l
The convergence layer is of either a mesh topology or a ring topology.
l
The dual-homed CE or multi-homed CE is configured on the access layer.
The S7700 does not support VPNv6 GR.
4.3 Configuring an IPv6 VPN Instances
The VPN instance is used to isolate VPN routes from public network routes.
4.3.1 Establishing the Configuration Task
Before configuring the IPv6 VPN instance, 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
The IPv6 VPN instance is used to isolate IPv6 VPN routes and public routes. Routes in different
IPv6 VPN instance are isolated from each other, and IPv6 VPN routes and IPv4 VPN routes are
isolated from each other. In all the BGP/MPLS IPv6 VPN networking scenarios, you should
configure IPv6 VPN instance.
The IPv6 VPN instance implements isolation of address spaces through the RD, and controls
IPv6 VPN membership and routing rules through the VPN-Target attribute.
To control the advertisement of IPv6 VPN routes more accurately with the VPN target attribute,
use import and export routing policies. The import routing policy is used to filter the routes
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.
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