
Customizing ATM DXI PVCs
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Changing the PVC Access Mode
You can enable each PVC to function in one of three access modes -- group
access, direct access, or hybrid access. The PVC Access Mode indicates how the
PVC behaves within the network. You can configure PVCs to use different modes
within the same physical interface.
When customizing each PVC, keep the following in mind:
• Accept the default, Group Access, if you want the PVC to act as part of a
group of PVCs. All group access PVCs on an interface use the same
protocols. This means that when you modify a protocol for one group PVC,
you are modifying that protocol for all of the group PVCs.
• Set the mode to Hybrid Access if you want the PVC to act as part of a group
of PVCs when routing and to act alone when bridging.
• Set the mode to Direct Access if you want the PVC to bridge or route to
different networks than do group access or hybrid access PVCs.
Assigning Data Encapsulation
The ATM DXI interface allows both multiprotocol encapsulation and CS PDU
encapsulation.
Multiprotocol encapsulation determines whether the outbound packets on the
interface are encapsulated with a NLPID (RFC 1490) or LLC/SNAP (RFC 1483)
multiprotocol header. All group or hybrid access mode PVCs on the interface use
the value you set for this field.
CS PDU encapsulation determines whether the outbound packets on the grouped
virtual channels use AAL 3/4 CS_PDU encapsulation or AAL 5 CS_PDU
encapsulation. All group and hybrid access mode PVCs on the interface use the
value you set for this field.
Note: Refer to “Access Modes for ATM DXI Services” in Chapter 2 for more
information about these three modes.
Appendix , “Mode
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