Edge PPPoA Architecture


PPPoA Architecture Overview

Advantages of Architecture:

  • Per session Auth
  • Per session accounting
  • IP address conservation
  • Easier troubleshooting of active individual subscribers
  • Can use oversubscription based on idle timeouts.
  • Scalable
  • Can use Service Selection Gateways (SSG)


  • Only single session per CPE.
  • Instead setup complexity of CPE.
  • Requires database for authentication
  • NAT can cause issues with apps like IPTV.

Service Destination

  • How service is terminated and where deals with service destination. This usually relates to where the PPP tunnel terminates.
  • Three common methods:
    • Terminating PPP sessions at the service provider. PPP between CPE and Aggregate router.
    • L2TP/L2F tunneling. Terminating PPP to the corporate gateway based on username and password. PPPoA to Aggregate router and L2TP/L2F to the corporate gateway. Only one gateway can be accessed.
    • Using Service Selection Gateway (SSG). One-to-many service, where the aggregate router can route based on Web-Based Service Selection Dashboard (SSD). For example single user can access corporate gateway, ISP and Extranet.



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