
Configuring ATM Services
2-2
ATM DXI Support
A router running ATM DXI provides the following support:
• Routing of IP, IPX, XNS, DECnet Phase IV, AppleTalk, and VINES traffic
over the ATM network
• MAC-level transparent bridging over the ATM network
• Multiprotocol encapsulation functions defined in RFC 1294 and RFC 1483
that enable concurrent bridging and multiprotocol routing support on the same
PVC
• A Convergence Sublayer function compatible with AAL 3/4 and AAL 5 as
defined in Section 1 of the CCITT (now ITU-T) B-ISDN Protocol Reference
Model (PRM)
• Error checking
• ATM DXI Link Management Interface (LMI), including SNMP Proxy
support. This is a proprietary version of the LMI and is available only when
using the Mode 2 Proprietary DXI encapsulation with a Digital Link DSU/
CSU.
• Broadcasting and multicasting support
• ARP and Inverse ARP support
The DSU/CSU supports the following layers:
• Segmentation and Reassembly (SAR) sublayer of the AAL
• ATM layer defined in the B-ISDN PRM
• Physical layer interface to the ATM network through DS1 and DS3
Multiprotocol Encapsulation
Multiprotocol encapsulation enables the router to multiplex and demultiplex
bridged or routed protocol data units (PDUs).
For transmission, this function adds a header between 2 and 8 octets in length to
the PDU to allow decoding. The decoding process determines the proper Service
Access Point (SAP).
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