l Inter-AS VPN-Option A
If the number of VPNs and VPN routes on the PE is small, the inter-AS VPN Option A
scheme can be used. When this scheme is used, the ASBR must support VPN instances
and can manage VPN routes. In addition, the ASBR must provide a dedicated interface for
each inter-AS VPN. The interface can be a sub-interface, physical interface, or logical
interface. Therefore, this scheme puts high requirement on the performance of the ASBR.
The ASBR, however, does not need any inter-AS configuration.
l Inter-AS VPN Option C
If each AS has a large number of VPN routes to be exchanged, the VPN Option C can be
used to prevent the ASBR from becoming a bottleneck of the network. If this scheme is
adopted, the VPN routes are exchanged between the ingress PE and egress PE directly, and
are not forwarded or stored by the intermediate devices. This scheme is applicable to the
scenario of load balancing in the MPLS VPN.
S7700 does not support Option C.
Pre-configuration Tasks
Before configuring the inter-AS Kompella VLL, complete the following tasks:
l Configuring static routes or IGP on the PE or P devices in the MPLS backbone network of
the ASs to implement IP networking of the backbone network devices in the same AS
l Configuring the basic MPLS capacity on the MPLS backbone network of each AS
l Configuring MPLS LDP and establishing LDP LSP for the MPLS backbone of each AS
Data Preparation
To configure the inter-AS Kompella VLL, you need the following data.
No.
Data
1 Scheme of the inter-AS VPN
2 Number of each AS
5.8.2 Configuring the Inter-AS Kompella VLL Option A
In inter-AS Kompella VLL OptionA, each ASBR must reserve a sub-interface for each inter-
AS VC. Therefore, this solution is only applicable to the situation that the number of inter-AS
VCs is small. Compared with L3VPN, this inter-AS L2VPN solution consumes more resources
and requires heavier configuration workload, which is not recommended.
Context
To configure inter-AS Kompella VLL Option A, see 5.6 Configuring Kompella VLL.
NOTE
l Configuring the ASBR of the remote end as the CE of the local end
l You do not need to perform inter-AS related configurations on the ASBR or to configure the IP
addresses on the ASBR interfaces that directly connect ASBRs.
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 5 VLL Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
475
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