Specifications

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Cisco ATM Services (AXSM) Configuration Guide and Command Reference for MGX Switches
Release 5.2, Part Number OL-6484-01 Rev. C0, September 2005
Chapter 1 Introduction
AXSM Models
In Table 1-3, the number of lines refers to the number of lines on a single back. Therefore, the highest
possible number of lines available on the front card is equal to the number of lines on the back multiplied
by the number of bays. For example, the AXSM-1-2488 card has one available line and the
AXSM-16-155 card has 16 possible lines.
For specifications and illustrations of the AXSM cards, see the applicable hardware installation
documentation for the Cisco MGX switch and card. For information on obtaining documentation, see
the Obtaining Documentation section in the preface of this document.
Logical Ports
On AXSMs, a logical port is also called a virtual interface and is represented by the ifNum variable. The
AXSMS can have the following types of interfaces:
• UNI (User-to-Network Interface)
• NNI (Network-to-Network Interface)
• VNNI (Virtual Network-to-Network Interface)
• VUNI (Virtual User-to-Network Interface)
• EVUNI (Enhanced Virtual User-to-Network Interface)
• EVNNI (Enhanced Virtual Network-to-Network Interface)
On UNI and NNI lines, you can configure only one logical port per line.
On VNNI and VUNI, you can configure multiple ports per line.
On EVNNI and EVUNI you can to specify a range of VPIs for a single interface, and this range of VPIs
represents the virtual NNI or virtual UNI trunk.
Multiple VNNIs and EVNNIs can coexist on the same line.
The ranges for the number of logical ports (ifNum) on the AXSMs are as follows:
• AXSM: 1–60
• AXSM-E: 1–32
• AXSM-XG: 1–126
Common Acronyms
Some of the most commonly used acronyms in this manual are listed below:
Acronym Definition
AXSM ATM Switching Service Module
CLI Command Line Interface
EVNNI Enhanced Virtual Network-to-Network Interface
EVUNI Enhanced Virtual User-to-Network Interface
ILMI Integrated Local Management Interface
IMA Inverse Multiplexing over ATM
NNI Network-to-Network Interface