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JUNOS 10.1 Network Interfaces Configuration Guide
PPPoE Overview
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" on page 363 and "ATM-over-SHDSL Overview" on
page 369.
M120 and M320 Internet routers can be configured as a PPPoE access concentrator
server. To configure a PPPoE server on an M120 or M320 Ethernet logical interface,
specify PPPoE encapsulation, include the
interface, and include the
interface.
NOTE: PPPoE encapsulation is not supported on M120 or M320 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
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
824
PPPoE Overview
server
PPPoE Interfaces on page 824
PPPoE Stages on page 825
Optional CHAP Authentication on page 826
pp0
statement for the pseudo PPPoE physical
statement in the PPPoE options under the logical
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