Cisco Octal-Port DMT ATU-C Line Card Manual do Utilizador descarregar pdf (Página 17)

192 Chapter 8: Using DSL to Access a Central Site

PPPoE Overview

For PPPoE, the ATU-R is transparent to this function, bridging the MAC/PPP frames across the

WAN interface. The PPPoE feature allows a PPP session to be initiated on a simple bridging

Ethernet-connected client. The session is transported over the ATM link via encapsulated Ethernet-

bridged frames. The session can be terminated at either a local exchange carrier central ofﬁce or an

Internet service provider point of presence. The termination device is a Cisco 6400 UAC.

In the PPPoE architecture, the IP address allocation for the individual host running the PPPoE

client is based on the same principle of PPP in dial mode—that is, via IPCP negotiation. Where

the IP address is allocated from depends on the type of service the subscriber has subscribed

to and where the PPP sessions are terminated. The PPPoE uses the dialup networking feature

of Microsoft Windows. The IP address assigned is reﬂected with the PPP adapter. The IP

address assignment can be either by the UAC or the home gateways if L2TP is used. The IP

address is assigned for each PPPoE session. Figure 8-8 illustrates the PPPoE protocol stack.

Figure 8-8 PPPoE Protocol Stack

To conﬁgure PPPoE, follow these steps. (Note that local authentication is used here, and the

router assigns IP addresses for the hosts. RADIUS can be used for these tasks.)

Step 1 Make sure Cisco Express Forwarding is enabled. If it isn’t, use the following

command to enable it:

ip cef

Step 2 Conﬁgure the username and password for local authentication:

username

name

password

secret

Step 3 Enable the virtual private dialup network (VPDN) conﬁguration:

vpdn enable

ATM PVC

ATM

ADSL

ATM

PHY

802.3

CAT 5

802.3

CAT 5

ATM

ADSL

1483

ATM

PHY

PPP

1483 over ATM

1483

PPP

802.3

CPE DSLAM 6400 UAC

0732x01.book Page 192 Monday, November 17, 2003 2:49 PM

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