Igx Switch Trunk Interfaces To Atm; Figure C-6 Sar Adaptation Process - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Appendix C ATM: An Overview
Figure C-6

IGX Switch Trunk Interfaces to ATM

The IGX switch connects to an ATM trunk via the UXM card. The BTM (IGX switch) can operate in
several different addressing modes that you can select (see Table C-2 and Figure C-7):
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•
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Table C-2 ATM Cell Addressing Modes
Addressing Mode
BAM-BPX switch
Addressing Mode
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
SAR Adaptation Process
Variable Length
48 Bytes
BAM
In the BPX switch Addressing Mode (BAM), used for all Cisco WAN switching networks, the
system software determines VPI and VCI values for each connection that is added to the network.
You enter the beginning and end points of the connection and the software automatically programs
routing tables in each node that will carry the connection to translate the VPI/VCI address. You do
not need to enter anything more.
This mode uses the STI header format and can support all of the optional Cisco WAN switching
features.
SAM
In the Simple Addressing Mode (SAM), you must manually program the path whole address, both
VPI and VCI values.
CAM
The Cloud Addressing Mode (CAM) is used in mixed networks where you program the virtual path
addresses and the switch decodes the VCI address. Both CAM and SAM utilize the UNI header
type.
Hdr. Type Derivation of VPI/VCI
STI VPI/VCI = Node Derived
Address
XXX Bytes
48 Bytes
Where Used
Between IGX switch and BPX switches, or
between IGX switch nodes.
Cisco BPX 8600 Series Installation and Configuration
Application Layer Information
CS – PDU
48 Bytes
SAR – PDU
ATM Cells
C-7