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Configuration Guide - VPN

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of VPN, including GRE, BGP/MPLS IP VPN, BGP/MPLS IPv6 VPN, VLL, PWE3, and VPLS.
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Multi-service Transparent Transmission over PWs on a MAN

Multi-service Transparent Transmission over PWs on a MAN

In many carrier-class services, carriers use digital subscriber line access multiplexers (DSLAMs) or Ethernet switches to provide access lines such as asymmetric digital subscriber line (ADSL), very-high-data-rate digital subscriber line (VDSL), or Ethernet links and need to control various services. Service control includes Point-to-Point Protocol over Ethernet (PPPoE) access request termination, IP address assignment, user authentication, authorization, and accounting. Broadband remote access servers (BRASs) are responsible for service control. As large-capacity and high-performance BRASs (Huawei ME60 for example) are developed, BRASs are moving gradually upward to the metropolitan area network (MAN) egress. This means that DSLAMs are connected to the MAN, and integrated BRASs are deployed at the MAN egress to control services.

BRASs usually exchange information with users through Layer 2 links. For example, a BRAS obtains user names and passwords through PPPoE sessions. However, a MAN is a Layer 3 IP/MPLS network. If Layer 2 user information is terminated on the UPE devices connected to DSLAMs, BRASs cannot obtain required information through Layer 2 connections, and therefore they cannot control services. To solve this problem, VLLs can be set up on the MAN to transmit Layer 2 packets exchanged between BRASs and users over PWs.

Figure 4-10 Multi-service transparent transmission over PWs on a MAN
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Updated: 2019-04-03

Document ID: EDOC1100075353

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