46
IPoA
IPoA enables IP packets to traverse an ATM network. In an IPoA implementation, ATM provides the
data link layer for the IP hosts on the same network to communicate with one another, and IP packets
must be adapted in order to traverse the ATM network.
IPoA makes full use of the advantages of ATM, including high speed point-to-point connections,
which help improve the bandwidth performance of an IP network, excellent network performance,
and complete, mature QoS services.
IPoEoA
IPoEoA adopts a three-layer architecture, with IP encapsulation at the uppermost layer, IPoE in the
middle, and IPoEoA at the bottom.
IPoEoA is suitable where Ethernet packets are to be forwarded through an ATM interface. For
example, it works when a network device forwards traffic from an Ethernet across an ATM PVC to a
network access server.
PPPoA
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 case, ATM
can be simply viewed as the carrier of PPP packets. As the communication process of PPPoA is
managed by PPP, PPPoA inherits the flexibility and comprehensive applications of PPP.
PPPoEoA
PPPoEoA enables ATM to carry PPPoE 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 the VE interface.
The 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 at the bottom layer
• Ethernet at the link layer
• Protocols the same as those for a common Ethernet interface at the network layer and upper
layers
Configuration procedure
To configure an ADSL/G.SHDSL interface:
1. Select Interface Setup > WAN Interface Setup from the navigation tree.
2. Click the icon for the ADSL/G.SHDSL interface.
3. Configure the ADSL/G.SHDSL interface, as described in Table 28, Table 29, Table 30,
and Table 31.
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