
Configuring ATM Services
2-8
Group Access Mode
In group access mode, upper-layer protocols treat each ATM network interface as
a single access point to the switched network. They use a single network address
to send all traffic destined for the switched network to the ATM network interface.
Figure 2-4 shows a conceptual drawing of group access mode (the default).
Figure 2-4. Group Access Mode
Group access supports the following protocols: IP, IPX, XNS, DECnet Phase IV,
AppleTalk, VINES, and transparent bridging. Of the three modes, group access
uses network addressing most efficiently and is the easiest to configure. Although
you need to configure each PVC manually for group access mode, you need only
define and associate protocols with the ATM network interface. All the group
access mode PVCs that you configure for a given ATM interface carry the
protocols that you select and configure to run on that interface.
In a bridged environment, use group access only for fully meshed configurations,
or in hub/spoke environments in which the spokes need not communicate. In a
nonbridged environment, you can use group access in any configuration that does
not require protocols residing on separate PVCs (that is, where all PVCs accept
the same protocols).
Group access works best in either fully meshed environments or in nonmeshed
environments where systems not directly connected to each other have no need to
communicate. There are, however, ways to configure upper-layer protocols, like
IP or IPX, to allow systems in nonmeshed networks to fully communicate. Refer
to the appropriate upper-layer protocol documentation for more information.
Note: When you configure group access mode, the PVCs all use the AAL type
that you set for the ATM DXI interface (that is, the value of the CS PDU
Encapsulation parameter set in the ATM DXI Interface List window).
Site A
Upper-layer
Protocol
Site B
Site C
ATM
Network
PVC
PVC
PVC
PVC
ATM
Network
Interface
Site D
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