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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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VPLS Application in Individual Services

VPLS Application in Individual Services

Service Overview

Individual services such as high speed Internet (HSI), voice over IP (VoIP), and broadband TV (BTV) are usually carried over carriers' metropolitan area networks (MANs).

Individual service gateways (such as SR and BRAS) are deployed at the MAN egress. Layer 2 packets of a user need to be transparently transmitted to a service gateway using VPLS or VLL technology. If Layer 2 packets are terminated on a PE and forwarded through Layer 3 routing, user information in the Layer 2 packets is lost. The service gateway fails to control the user because it cannot receive the user information. When the primary and secondary service gateways are deployed on the MAN, user traffic needs to be dual-homed to the access service gateways. The VPLS technology must be used to achieve this goal.

Networking Description

Individual services are transmitted to the Internet over the access layer, convergence layer, and core layer of a MAN. Figure 6-13 shows the typical networking for individual services.

  • HSI services access the Internet over the MAN.

  • VoIP services request IP addresses from the Dynamic Host Configuration Protocol (DHCP) server over the MAN.

  • BTV multicast members apply for BTV services from multicast sources over the MAN.

Figure 6-13 Typical networking for individual services

Feature Deployment

VPLS is configured on PEs to transparently transmit traffic between them. Figure 6-13 uses LDP VPLS as an example to show VPLS configuration:

  • Access-layer devices

    VLANs are configured to differentiate different types of users.

    PPPoE over AAL5 (PPPoEoA) and PPP over AAL5 (PPPoA) are configured to allow access of HSI users through dialup.

    Multicast VLAN and IGMP snooping are configured to transmit multicast services.

  • Aggregation-layer devices

    Interior Gateway Protocols (IGPs) are configured on PEs so that these PEs can communicate with each other.

    Basic MPLS functions are configured on PEs so that these PEs can establish remote LDP sessions.

    MPLS L2VPN and VSIs are configured on PEs.

    A VPLS daisy chain is deployed on PEs to transmit multicast services.

  • Core-layer devices

    Authentication and accounting features are configured on Broadband Remote Access Servers (BRASs) so that BRASs can terminate HSI services.

    IGPs are configured on Service Routers (SRs) so that these SRs can communicate with each other.

    Basic MPLS functions are configured on SRs.

    DHCP relay is configured on SRs, allowing VoIP users to obtain IP addresses from DHCP servers.

    Layer 3 multicast features are configured on SRs so that these SRs can communicate with multicast sources.

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Updated: 2019-04-03

Document ID: EDOC1100075353

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