Overview Of Ipoa, Ipoeoa, Pppoa And Pppoeoa Applications; Ipoa; Ipoeoa; Pppoa - H3C SR6600 Configuration Manual

specific services provided in an ATM network. Most ATM equipment vendors adopt AAL5 for data
communication services.
ATM upper layer protocols take charge of WAN interconnection, voice interconnection, Layer 3
interconnection, encapsulation, LAN emulation, multi-protocol over ATM, and traditional IP.

Overview of IPoA, IPoEoA, PPPoA and PPPoEoA Applications

ATM interfaces support the IPoA, IPoEoA, PPPoA and PPPoEoA applications.

IPoA

IP over ATM (IPoA) enables ATM to carry IP packets. In an IPoA implementation, ATM serves as the
data link layer protocol for the IP hosts on the same network. To enable these hosts to communicate
across an ATM network, IP packets must be encapsulated in ATM cells.
By making full use of the advantages of ATM, IPoA delivers excellent network performance and
ubiquitous mature QoS assurance.

IPoEoA

IPoE over ATM (IPoEoA) adopts a three-layer architecture, with IP encapsulation at the uppermost layer,
IP over Ethernet (IPoE) in the middle, and IPoEoA at the bottom.
IPoEoA is suitable where Ethernet packets are to be forwarded through ATM interfaces. In IPoEoA
applications, you can associate multiple PVCs with one virtual Ethernet (VE) interface and PVCs
associated with the same VE interface are interconnected at Layer 2.

PPPoA

PPP over ATM (PPPoA) enables ATM to carry PPP protocol packets. With PPPoA, PPP packets, in
which IP packets or other protocols' packets can be encapsulated, are encapsulated in ATM cells. In this
way, ATM may be simply viewed as the carrier of PPP packets. As the communication process of
PPPoA is managed by PPP, PPPoA also features the flexibility and comprehensive applications of PPP.
To transmit PPP packets through ATM, a virtual template (VT) interface is required.

PPPoEoA

PPPoE over ATM (PPPoEoA) enables ATM to carry PPPoE (PPP over Ethernet) protocol packets. With
PPPoEoA, Ethernet packets are encapsulated in ATM cells, through which you can use a PVC to
simulate all the functions of Ethernet. To allow ATM to carry Ethernet frames, the interface management
module provides a new type of virtual Ethernet (VE) interface. This type of VE interface has Ethernet
characteristics and can be dynamically created through configuration commands. The following is the
protocol stack adopted by the VE interface:
ATM PVC (the bottom layer)
Ethernet (the link layer)
Network layer and other upper layers (the same as those for common Ethernet interfaces)
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