Two Phases For Establishing A Pppoe Session; Discovery Phase - HP ProCurve 7000dl Series Basic Management And Configuration Manual

ADSL WAN Connections
PPPoE Overview
Customer's Premises
Router
LAN
Negotiates PPPoE session
with access concentrator
7-30
Local
loop
Splitter
Figure 7-8. Access Concentrator for PPPoE Access

Two Phases for Establishing a PPPoE Session

To establish a PPPoE session, the client and the access concentrator must
successfully complete two phases:

discovery phase

PPP session
Discovery Phase
During the discovery phase, the PPPoE client must find an access concentra-
tor, obtain the access concentrator's Ethernet MAC address, and learn the
session ID that the access concentrator assigns this PPPoE session. If the
PPPoE client fails to obtain any of this information, the discovery phase fails,
and the PPPoE session is not established.
The PPPoE discovery phase includes four steps, as shown in Figure 7-9.
Central Office
DSLAM
Splitter
Negotiates PPPoE
session with router
Regional
broadband
network
Other
DSLAMs
Broadband
switch (ATM)
Access
concentrator