3.3.1 Establishing the Configuration Task
Before configuring a VPN instance, familiarize yourself with the applicable environment,
complete the pre-configuration tasks, and obtain the data required for the configuration. This
will help you complete the configuration task quickly and accurately.
Applicable Environment
In BGP/MPLS IP VPN, each VPN is instantiated, and the instances of private forwarding
information of each VPN are established, that is, a VPN instance is established. A VPN instance
is also called the VPN Routing and Forwarding (VRF) table. In RFC 4364 (BGP/MPLS IP
VPNs), a VPN instance is called the per-site forwarding table.
The VPN instance is used to separate the VPN routes from public routes. In all the BGP/MPLS
IP VPN networking scenarios, you should configure VPN instances.
The VPN instance can realize the separation of address spaces based on the Router Distinguisher
(RD), and can control VPN membership and routing rules based on the VPN target attribute.
In addition, to achieve enhanced routing control, you can also enforce inbound and outbound
routing policies. The inbound routing policy is used to filter the routes imported into the VPN
instance, and the outbound routing policy is used to filter the routes advertised to other PEs.
Pre-configuration Tasks
Before configuring a VPN instance, complete the following tasks:
l Configuring routing policies if import or export routing policies need to be applied to the
VPN instance
Data Preparation
To configure a VPN instance, you need the following data.
No.
Data
1 Name of the VPN instance
2 (Optional) Description of the VPN instance
3 RD, VPN target attribute of the VPN instance
4 (Optional) Maximum number of routes allowed by the VPN instance
5 (Optional) Routing policy that controls the receiving and sending of VPN routes
6 (Optional) Tunnel policy
3.3.2 Creating a VPN Instance
Configuring a VPN instanceis the preliminary step for configuring other VPN attributes. After
a VPN instance is configured, a VPN routing and forwarding table is created.
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 3 BGP MPLS IP VPN Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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