Cisco Octal-Port DMT ATU-C Line Card Manual de usuario descargar pdf (Pagina 15)

190 Chapter 8: Using DSL to Access a Central Site

PPPoA Overview

When conﬁgured for PPP over ATM, the ATU-R acts as a router, and additionally provides

DHCP and NAT services to the LAN side. In the case of PPP routing, IP packets are

encapsulated into a PPP frame and then are segmented into ATM cells through AAL5. The PPP

sessions initiated by the subscriber are terminated at the service provider that authenticates

users, either using a local database on the router or through a RADIUS server. After the user is

authenticated, IPCP negotiation takes place, and then the IP address gets assigned to the CPE.

Figure 8-7 illustrates the PPPoA protocol stack.

Figure 8-7 PPPoA Protocol Stack

Follow the next steps to conﬁgure PPPoA. (Note that local authentication is used here and that

the IP address for the CPE is assigned by the router. RADIUS can be used for these tasks.)

Step 1 Conﬁgure a username and password for local authentication:

username

name

password

secret

interface ATM0/0/0.1 point-to-point

ip unnumbered Loopback0

no ip directed-broadcast

atm route-bridged ip

pvc 1/35

encapsulation aal5snap

ip route 192.168.1.2 255.255.255.255 ATM0/0/0.1

Example 8-10 RBE Conﬁguration (Continued)

AT M

ADSL

AT M

PHY

802.3

CAT 5

802.3

CAT 5

PPP

AT M

ADSL

1483

AT M

PHY

PPP

1483 over ATM

ATM PVC

1483

CPE DSLAM 6400 UAC

0732x01.book Page 190 Monday, November 17, 2003 2:49 PM

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