Networking ATM on AS/400 - AS/400e

Networking ATM on AS/400 - AS/400e

AS/400e Networking ATM on AS/400 

AS/400e Networking ATM on AS/400 

© Copyright International Business Machines Corporation 1998, 2000. All rights reserved. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.

Contents Part 1. ATM . 1 Chapter 1. Print this topic . 3 Chapter 2. Understanding ATM support 5 ATM basics . 5 ATM medium access control address . 6 ATM switch and switching .

6 Bridges dropping frames . 6 AS/400 ATM support . 7 ATM Compatibility . 7 ATM Hardware, client, and protocol support . . 7 AS/400 ATM services . 8 What is LAN emulation . 9 ATM connection types . 11 ATM problem diagnosis . 11 ATM communications-path test . 12 LAN communications trace . 12 ATM performance issues . 13 LAN emulation performance . 13 SNA over ATM timing issues . 14 Chapter 3. Planning ATM support . 19 Chapter 4. Configuring ATM on the AS/400 . 21 Configuration considerations unique to LAN emulation . 21 Create the ATM network interface description . 21 Identify the ATM IOA . 22 Create a token-ring over ATM line description .

22 Create an Ethernet over ATM line description . 24 Verifying your configurations . 24 Examples: Configuring support for ATM . 25 Example: Configuring the NWI description . 25 Example: Configuring an ATM permanent connection . 25 Example: Configuring the token-ring line description for use with ATM . 27 Example: Configuring an Ethernet line description for use with ATM . 30 Chapter 5. Managing the ATM network 33 Commands for LAN configuration objects . 33 ATM NWI description commands . 33 Token-ring line description commands . 33 Ethernet line description commands . 34 Enabling or disabling configuration objects .

34 Adding LAN emulation security . 35 Changing ATM NWI or line description attachments 35 Changing ATM-connection types . 35 Chapter 6. SNA/LAN emulation performance tuning . 37 Adjusting ATM connection performance . 37 Finding controller description change commands 37 Adjusting outstanding LAN frames . 37 Increasing data transfer speeds in emulated LANs 38 Chapter 7. Troubleshooting ATM on the AS/400 . 39 Finding ATM errors . 39 Viewing QSYSOPR or other message queues . . 39 Viewing print error log . 39 ATM network cause codes . 40 Example: Locating ATM errors . 45 Testing the communications path .

45 Testing the ATM IOA . 46 Testing IOA communications . 46 Testing local switch path . 47 Testing communications path to remote station 49 Communications-path-test failures . 51 Tracing LAN communications . 51 Specify trace parameters . 52 Viewing LAN traces . 52 Adjusting your LAN-frame size . 53 © Copyright IBM Corp. 1998, 2000 iii

iv AS/400e: Networking ATM on AS/400

Part 1. ATM Asynchronous transfer mode (ATM) provides a very fast and flexible network protocol. When used with LAN emulation, you can run token-ring and Ethernet on ATM to take advantage of ATM’s superior speed, throughput, and flexibility. The information here shows you how to use ATM and LAN emulation with other LAN protocols and to configure and manage ATM support on your AS/400. ATM support on the AS/400: To use LAN emulation with traditional local area networks (LANs) and to configure and manage ATM support on your AS/400 see: v Print this topic.

v “Chapter 2. Understanding ATM support” on page 5. v “Chapter 3. Planning ATM support” on page 19. v “Chapter 4. Configuring ATM on the AS/400” on page 21. v “Chapter 5. Managing the ATM network” on page 33. v “Chapter 6. SNA/LAN emulation performance tuning” on page 37. v “Chapter 7. Troubleshooting ATM on the AS/400” on page 39. © Copyright IBM Corp. 1998, 2000 1

2 AS/400e: Networking ATM on AS/400

Chapter 1. Print this topic You can view or download a PDF version of this document for viewing or printing. You must have Adobe® Acrobat® Reader installed to view PDF files.

You can download a copy from Adobe . To view or download the PDF version, select ATM (about 523 KB or 64 pages). To save a PDF on your workstation for viewing or printing: 1. Open the PDF in your browser (click the link above). 2. In the menu of your browser, click File. 3. Click Save As... 4. Navigate to the directory in which you would like to save the PDF. 5. Click Save.

© Copyright IBM Corp. 1998, 2000 3

4 AS/400e: Networking ATM on AS/400

Chapter 2. Understanding ATM support To understand and manage your system’s ATM support and to know what commands are available, read: v Read “ATM basics” for an overview of asynchronous transfer mode (ATM). v Discover the ATM functions that your system supports. This information also discusses LAN emulation functions that your system supports. v Learn how to diagnose ATM errors through tools that test your communications path or trace your communications between systems.

v Improve your ATM communication performance by learning what options are available to you.

ATM basics No matter what your business — corporations, out sourcers, or service providers — asynchronous transfer mode (ATM) can save you money and move your networks into the future. ATM has advantages such as superior speed, throughput, flexibility, and LAN emulation (the ability to run other LAN protocols on ATM to take advantage of ATM’s capabilities). For instance, you can use token-ring or Ethernet over ATM. ATM incorporates the following features: v Small, fixed-length cells: ATM cells are the fundamental unit of the ATM transmission. Because of the cell’s small size, the network can easily adjust the traffic flow.

ATM can mix cells from many sources and route individual cells to different destinations. Each cell is 53 bytes that contains: – A 48-byte payload for data and voice traffic. – A 5-byte header that contains virtual circuit information that is used to route the cell to its proper destination.

v Negotiated service connections: The network negotiates requirements for each connection, which include traffic characteristics, peak and average cell rates, and quality of service. v Network switches: ATM switch-based networks provide varying node access speeds, easy scalability, and dedicated bandwidth. Bandwidth refers to transmission capacity, utilization, or requirements. If you need other information about ATM or frames that are dropped, see this information: v “ATM medium access control address” on page 6 v “ATM switch and switching” on page 6 v “Bridges dropping frames” on page 6 If you want further information about ATM, see these topics: v ATM Overview on the IBM Networking Web page .

v Campus ATM Design Guidelines .

v ATM Forum . © Copyright IBM Corp. 1998, 2000 5