l
Run the
display ip routing-table
command to check routing information on the Hub-CE
and all the Spoke-CEs.
----End
Example
Run the preceding commands. If the routing table of the VPN-in has routes to all the Spoke
stations, and the routing table of the VPN-out has routes to the Hub and all the Spoke stations,
it means the configuration succeeds.
Additionally, Hub-CE and all the Spoke-CEs have routes to the Hub and all the Spoke stations.
3.6 Configuring Inter-AS VPN Option A
In inter-AS VPN OptionA, an ASBR takes the peer ASBR as its CE and advertises VPNv4 routes
to the peer ASBR through EBGP.
3.6.1 Establishing the Configuration Task
Before configuring inter-AS VPN OptionA, 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 the VPN routes is across multiple ASs, you must
configure the Inter-AS VPNs.
The Inter-AS VPN Option A is convenient to implement and is suitable when the amount of the
VPNs and the VPN routes on the PE is small.
In VPN-Option A, the Autonomous System Boundary Routers (ASBRs) must support the VPN
instances and can manage VPN routes. Option A, therefore, requires high performance of the
ASBRs. No inter-AS configuration is needed on the ASBRs.
Pre-configuration Tasks
Before configuring inter-AS VPN Option A, complete the following tasks:
l
Configuring IGP for MPLS backbone networks in each AS to keep IP connectivity of the
backbones in one AS
l
Enabling MPLS and MPLS LDP on the PE and the ASBR
l
Setting up the tunnel (LSP or MPLS TE) between the PE and the ASBR in the same AS
l
Configuring the IP address of the CE interface through which the CE accesses the PE
Data Preparation
To configure inter-AS VPN Option A, you need the following data:
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.
125