Junos® OS Ethernet Interfaces Configuration ... - Juniper Networks

Junos ®
OS 12.3 Ethernet Interfaces Configuration Guide
PPPoE Overview
PPPoE Interfaces
394
The Point-to-Point Protocol over Ethernet (PPPoE) connects multiple hosts on an
Ethernet LAN to a remote site through a single customer premises equipment (CPE)
device. Hosts share a common digital subscriber line (DSL), a cable modem, or a wireless
connection to the Internet.
A J Series router can be configured as the CPE device for PPPoE connections. To use
PPPoE, you must configure the router as a PPPoE client, encapsulate PPP packets over
Ethernet, and initiate a PPPoE session.
NOTE: J4300 and J6300 routers with asymmetrical DSL (ADSL) Physical
Interface Modules (PIMs) and symmetrical high-speed DSL (SHDSL) PIMs
can use PPPoE over Asynchronous Transfer Mode (ATM) to connect through
DSL lines only, not for direct ATM connections. For information about
configuring ADSL and SHDSL interfaces, see ATM-over-ADSL Overview and
ATM-over-SHDSL Overview.
M120, M320, and MX Series routers can be configured as a PPPoE access concentrator
server. To configure a PPPoE server on an M120, M320, or MX Series Ethernet logical
interface, specify PPPoE encapsulation, include the pp0 statement for the pseudo PPPoE
physical interface, and include the server statement in the PPPoE options under the
logical interface.
NOTE: PPPoE encapsulation is not supported on M120, M320, or MX Series
routers on an ATM2 IQ interface.
On the J Series router, PPPoE establishes a point-to-point connection between the client
(the Services Router) and the server, also called an access concentrator. Multiple hosts
can be connected to the Services Router, and their data can be authenticated, encrypted,
and compressed before the traffic is sent to the PPPoE session on the Services Router’s
Fast Ethernet or ATM-over-ADSL interface. PPPoE is easy to configure and enables
services to be managed on a per-user basis rather than on a per-site basis.
This overview contains the following topics:
• PPPoE Interfaces on page 394
• PPPoE Stages on page 395
• Optional CHAP Authentication on page 396
The PPPoE interface to the access concentrator can be a Fast Ethernet interface on any
Services Router, a Gigabit Ethernet interface on J4350 and J6350 Services Routers, an
ATM-over-ADSL or ATM-over-SHDSL interface on all J Series Services Routers except
the J2300, or an ATM-over-SHDSL interface on a J2300 Services Router. The PPPoE
Copyright © 2012, Juniper Networks, Inc.