Cisco BPX 8650, Installation And Configuration Manual

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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 22 Configuring Frame Relay to ATM Network and Service Interworking
Connection Management
•
Full VPI/VCI addressing range—Supports the entire range of VPI and VCI on both UNI and NNI
interfaces. For ATM-UNI, 8 bits of VPI and 16 bits of VCI are supported. For ATM-NNI, 12 bits of
VPI and 16 bits of VCI are supported. In either case, VPC connections only pass through the lower
12 bits of the VCI field.
• Connection Classes —Specifies that the ATM and interworking connection classes are defined with
the appropriate bandwidth parameter defaults. The classes apply only at addcon time. They are
templates to ease the task of configuring the large number of bandwidth parameters that exist per
connection.
Commands
The following are the commands that are associated with virtual circuit feature changes:
•
addcon
• addcongrp
•
cnfcon
• cnfatmcls
•
delcon
•
delcongrp
•
dspatmcls
• dspcongrps
•
grpcon
Connection Management
Interworking connections may be added from either the BPX switch, the IGX switch, the MGX 8800, or
the MGX 8220. Intra- and inter-domain interworking connections are supported.
Connection configuration parameters are endpoint-specific. Thus, the ATM-only parameters are only
configurable on the BPX switch end. The IGX switch does not know about these parameters, so they
cannot be configured or displayed at the IGX switch end. Parameter units are endpoint-specific also.
Units on the BPX switch are cells per second, units on the IGX switch are bits per second.
Bundled interworking connections are not supported.
Virtual path interworking connections are not supported.
Because the NNI cell format has 12 bits for the VPI, the command addcon allows specification of VPI
0–4095 on NNI ports.
Routing
Interworking connections use the complex gateway feature of the UXM card to repackage data from
frames to ATM cells, and so forth. All BPX switch-IGX switch hops these connections route over must
provide the complex gateway function.
IGX-to-IGX hops (Frame Relay connections) can be any trunk card type. This requirement simplifies
the routing mechanism when dealing with structured networks, because software does not know the type
of trunks in remote domains.