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4 Bridged PPPoE
Introduction
Features
Bridged PPPoE vs.
connection service
Protocol stack
E-DOC-CTC-20051017-0167 v1.0
The SpeedTouch™ Bridged Ethernet Packet Service can be used in combination
with a PPP over Ethernet (PPPoE) client installed on your computer. The resulting
Bridged PPPoE packet service provides similar Dial–In experience as found on
point–to–point connections.
PPPoE client on PC
SpeedTouch
terminates the PPP
operating as
connection
Transparent Bridge
Public IP address
Bridged PPPoE has the following features:
A Dial-In access method over a virtual Ethernet segment
Platform and Operating System independent towards the SpeedTouch™
The features of the SpeedTouch™ Bridged Ethernet Packet Service.
The Bridged PPPoE Packet Service relies on the AAL5/RFC2684/Bridged Connection
Service to achieve end-to-end connectivity.
This connection service type implies the encapsulation of Ethernet frames (often
referred to as IEEE802.3, MAC frames or Bridging frames) in AAL5/ATM.
All SpeedTouch™ products are compliant with RFC2684 "Multi-protocol
Encapsulation over ATM Adaptation Layer 5" and support both the LLC/SNAP and
VC-MUX encapsulation method for Bridged Ethernet V2.0/IEEE802.3 Protocol Data
Units (PDUs). The default encapsulation method is set to LLC/SNAP.
The figure below shows the bridged PPPoE protocol stack.
ip
PPPoE
ppp
mac
eth
PC
CPE
DSLAM
Connection Service Name: PPPoE
Connection Service Type: PPPoE
Virtual Channel with:
ATM Encapsulation Type: LLC/SNAP
adsl
DSLAM
Chapter 4
Bridged PPPoE
BRAS
Internet
IP
PPP
PPPoE
mac
RFC1483b
AAL5/ATM
PHY
Service
Gateway
25
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