Point-To-Point Protocol Over Ethernet (Pppoe); Payload Encapsulations; Weighted Fair Queueing (Class Of Service) - Nokia M1122 Administrator's Manual

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Figure 2-5

2.2.8 Point-to-Point Protocol over Ethernet (PPPoE)

Standard PPPoE mode is used when M1122 is operating as a bridge.

PPPoE protocol defines how PPP sessions are mapped into Ethernet

packets. When M1122 operates as a bridge, this protocol is transparent

to M1122.

Both routed and bridged protocols are encapsulated in the ATM link by

using either RFC 2684 LLC/SNAP encapsulation or VC multiplexing.

M1122 also supports PPP over AAL5 encapsulation, in which routed

protocols are first encapsulated in PPP (RFC 1661). PPP is then

encapsulated in ATM according to the IETF PPP over AAL5 using

RFC 2364 VC multiplexing or LLC/NLPID encapsulation.

As a Class of Service (CoS) function, M1122 supports Weighted Fair

Queueing (WFQ) for each ATM VCC. The CoS function ensures that

different IP traffic flows are treated fairly in the upstream (towards the

Internet) direction. This may be necessary, in some cases, because the

upstream capacity of the ADSL line is somewhat limited compared to

the Ethernet bandwidth on the office or home LAN. The WFQ CoS

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Choosing the VCC2 for tunneling example

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