
Customizing an ATM DXI Interface
117375-A Rev. A 4-3
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 Network Layer Protocol ID (NLPID; RFC 1294)
or Logical Link Control / Subnetwork Access Protocol (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.
Selecting a Multiprotocol Encapsulation Method
You can use one of three multiprotocol encapsulation methods for the ATM DXI
interface -- LLC/SNAP, NLPID, or NO MPE.
We recommend that you use the default setting, LLC/SNAP, when selecting a
multiprotocol encapsulation method. However, keep the following exceptions in
mind:
• If you are running a router software version earlier than Version 8.00, use
NLPID for backward compatibility.
• If you specify NO MPE, the router interprets this as virtual channel-based
multiplexing, which is not supported for bridging.
Appendix , “Multiprotocol Encapsulation
Caution: When assigning data encapsulation to an interface, make sure that
the encapsulation method matches that of the DSU/CSU.
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