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access concentrator
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Router that acts as a server in a PPPoE session—for example,
an E-series router.
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customer premises equipment (CPE)
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Router that acts as a PPPoE client in a PPPoE session—for
example, a Services Router.
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Logical Link Control (LLC)
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Encapsulation protocol that allows transport of multiple protocols
over a single ATM virtual connection.
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Point-to-Point Protocol (PPP)
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Encapsulation protocol for transporting IP traffic over point-to-point
links.
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PPP over Ethernet (PPPoE)
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Network protocol that encapsulates PPP frames in Ethernet frames
and connects multiple hosts over a simple bridging access device to
a remote access concentrator.
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PPPoE Active Discovery Initiation (PADI) packet
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Initiation packet that is broadcast by the client to start the
discovery process.
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PPPoE Active Discovery Offer (PADO) packet
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Offer packets sent to the client by one or more access concentrators in reply
to a PADI packet.
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PPPoE Active Discovery Request (PADR) packet
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Packet sent by the client to one selected access concentrator to request a
session.
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PPPoE Active Discovery Session-Confirmation (PADS)
packet
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Packet sent by the selected access concentrator to confirm the session.
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PPPoE Active Discovery Termination (PADT) packet
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Packet sent by either the client or the access concentrator to terminate a
session.
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PPPoE over ATM
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Network protocol that encapsulates PPPoE frames in Asynchronous
Transfer Mode (ATM) frames for asymmetric digital subscriber line
(ADSL) or symmetric high-speed DSL (SHDSL) transmission, and connects
multiple hosts over a simple bridging access device to a remote access concentrator.
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virtual path identifier (VPI)
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An identifier of the virtual path that establishes a route between
two devices in a network.
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virtual channel identifier (VCI)
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An identifier of the virtual channel inside a virtual path.
Each virtual path identifier (VPI) can contain multiple virtual channels,
each represented by a VCI.
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