Establishing Pppoe Session - Cisco ASR 9000 Series Configuration Manual
Aggregation services router broadband
network gateway
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Establishing PPPoE Session
Establishing PPPoE Session
The PPP protocol is mainly used for communications between two nodes, like a client and a server. The PPP
protocol provides a standard method for transporting multi-protocol diagrams over point-to-point links. It
defines an encapsulation scheme, a link layer control protocol (LCP), and a set of network control protocols
(NCPs) for different network protocols that can be transmitted over the PPP link. The LCP is used to configure
and maintain the data link. PPP peers can use the LCP to negotiate various link layer properties or
characteristics. The NCP is used to establish and configure the associated network protocol before data packets
for the protocol can be transmitted.
One of the methods to establish PPP connection is by the use of PPP over Ethernet (PPPoE). In a PPPoE
session, the Point-to-Point (PPP) protocol runs between the CPE and BNG. The Home Gateway (which is
part of the CPE) adds a PPP header (encapsulation) that is terminated at the BNG.
CPE detects and interacts with BNG using various PPPoE Active Discovery (PAD) messages listed here:
• PPPoE Active Discovery Initiation (PADI)—The CPE broadcasts to initiate the process to discover
• PPPoE Active Discovery Offer (PADO)—The BNG responds with an offer.
• PPPoE Active Discovery Request (PADR)—The CPE requests to establish a connection.
• PPPoE Active Discovery Session confirmation (PADS)—BNG accepts the request and responds by
• PPPoE Active Discovery Termination (PADT)—Either CPE or BNG terminates the session.
In redundant BNG setups, where the PPPoE client is connected to multiple BNGs, the PADI message sent
by the CPE is received on all BNGs. Each BNG, in turn, replies with a PADO message. You must configure
Smart Server Selection on BNG to allow subscribers to select one of the BNGs in a multi-BNG setup. Refer
PPPoE Smart Server Selection, on page 117
The BNG provides configuration flexibility to limit and throttle the number of PPPoE sessions requests, based
on various parameters. For details, see
page
The PPPoE session are of two types, PPP PTA and PPP LAC. For the functioning of PPP PTA and PPP LAC
session, the RADIUS server must be set up to authenticate and forward sessions as necessary. There is no
local authentication available on BNG. The PPP PTA and PPP LAC sessions are explained in the sections,
Provisioning PPP PTA Session, on page 93
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Configuration Guide,
Release 4.3.x
92
BNG.
assigning a session identifier (Session-ID).
122.
PPPoE Session Limit, on page 120
and
Provisioning PPP LAC Session, on page
Establishing Subscriber Sessions
and
PPPoE Session Throttle, on
100.
OL-28375-03
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