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NE40E V800R010C10SPC500 Feature Description - Virtual Access 01

This is NE40E V800R010C10SPC500 Feature Description - Virtual Access
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Introduction of Virtual Access

Introduction of Virtual Access


With the rapid development of network services, many devices are deployed at the access layer of an existing MAN or mobile bearer network, bringing various networking changes. From a customer's perspective, complex planning and protocol configurations are required for service deployment, which results in high network O&M costs. Huawei provides a virtual access solution to reduce O&M costs without increasing network device investments.

Technical Overview

Virtual access virtualizes the access layer of the entire MAN or mobile bearer network as one or several devices to simplify the network from the perspective of customers and reduce network O&M costs. As shown in Figure 3-1, after virtual access is deployed, all edge PEs can be considered as the aggregation PE's remote cards, whereas the edge PEs' service interfaces to the user-side network can be considered as the aggregation PE's local interfaces. Virtual access enables customers to configure and manage services only on the aggregation PE, which significantly simplifies service deployment and network O&M. In the virtual access solution, the edge PEs are called access points (APs), and the aggregation PE is called a master.

  • AP: an access node in the virtual access system. An AP can be considered as a master's card and is automatically discovered and managed by a master. An AP receives configuration and forwarding entries delivered by a master and provides external communication interfaces.

  • Master: a control node in the virtual access system. A master establishes a tunnel, delivers a service, controls traffic, and manages connected APs.

Figure 3-1 Virtual access solution

Related Concepts

The following table describes the basic concepts involved in virtual access.



Internal communication interface

An interface with virtual access enabled between a master and AP or between APs.

External communication interface

An interface through which an AP connects to a user-side network. This interface is used to carry services and has the corresponding virtual access interface on a master.

Virtual access interface

A virtual agent interface that a master establishes for an AP's external communication interface. A virtual access interface on a master corresponds to an external communication interface on an AP.

vaLSP and vaTunnel

A virtual access label switched path (vaLSP) is a bidirectional co-routed LSP established between an AP and master. Multiple vaLSPs (usually primary and backup vaLSPs) form a virtual access tunnel (vaTunnel), which is used to carry virtual access pseudo wires (vaPWs).


A PW established between an AP's external communication interface and a master's corresponding virtual access interface.

Figure 3-2 Related virtual access concepts

Solution Benefits

The virtual access solution offers the following benefits:

  • Extended interface density on a master

    After deploying a virtual access system, you can create multiple virtual slots to correspond to multiple APs. An external communication interface on each AP can be mapped to a virtual access interface on a master, which significantly extends the master's interface density.

  • Simplified network deployment

    Virtual access supports plug-and-play (PnP) for APs. After APs go online, a master automatically discovers and manages them. The master collects the virtual access system's topology information and calculates paths, and automatically delivers generated entries to APs, which significantly simplifies network deployment.

  • Simplified service configuration

    Dynamic protocols, MPLS, L2VPN, and L3VPN do not need to be configured in the virtual access system, which significantly reduces configuration workloads. All service configurations are performed on a master, which improves service deployment efficiency.

  • Reduced O&M costs

    The control and management planes of the virtual access system are centralized on a master, and services are configured and queried on a master or network management system (NMS). Therefore, customers do not need to configure and manage services on APs, which significantly reduces network O&M costs.

Updated: 2019-01-03

Document ID: EDOC1100055053

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