3.6.3 Checking the Configuration
After configuring inter-AS VPN OptionA, you can view information about all BGP peer
relationships and IPv4 VPN routes on PEs or ASBRs.
Prerequisite
The configurations of the Inter-AS VPN Option A function are complete.
Procedure
l Run the display bgp vpnv4 all peer command to check information about the BGP peers
on the PE or the ASBR.
l Run the display bgp vpnv4 all routing-table command to check the IPv4 VPN routes on
the PE or the ASBR.
l Run the display ip routing-table vpn-instance vpn-instance-name command to check the
VPN routing table on the PE or the ASBR.
----End
Example
After the successful configuration, run the display bgp vpnv4 all peer command on the PE or
the ASBR, and you can view that the BGP VPNv4 peer relationship between the ASBR and the
PE in the same AS is "Established".
Run the display bgp vpnv4all routing-table command on the PE or the ASBR, and you can
view the VPNv4 routes on the ASBR.
Run the display ip routing-table vpn-instance command on the PE or the ASBR, and you can
view all the relevant routes in the VPN routing table.
3.7 Configuring Inter-AS VPN Option B
In inter-AS VPN OptionB, through MP-EBGP, two ASBRs receive VPNv4 routes from PEs in
their respective ASs and then 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, however, there are no 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:
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.
127
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