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8271 Nways Ethernet LAN Switch
ATM OC-3c Module
User’s Guide
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Before using this information and the product it supports, be sure to read the general information under Appendix A,“Safety Infor- mation” and Appendix F, “Notices, Trademarks, and Warranties”. First Edition (October 1997) This edition applies to the IBM 8271 Nways Ethernet LAN Switch ATM 3C-Oc Module with agent software version 1.05 and IBM 8271 Nways Ethernet LAN Switch Models 524, 612, 624, 712 with agent software version 3.1. Order publications through your IBM representative or the IBM
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CONTENTS Mapping Ethernet and ATM Addresses 2-6 ABOUT THIS GUIDE Address Resolution 2-6 Introduction 1 LAN Emulation Address Resolution Protocol (LE_ARP) 2-7 Terminology 1 What Happens to Unicast Frames? 2-7 ATM Terminology 1 What Happens to Broadcast and Multicast Frames? 2-7 Finding Information in This Guide 2 ATM Adaptation Layer (AAL) 2-8 Conventions 2 Asynchronous Transfer Mode (ATM) Layer 2-8 Related Documentation 3 ATM is Cell-based 2-8 ATM is Service Transparent 2-9 1 FEATURES AND BENEF
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Logging On 7-3 4 PUTTING YOUR ATM NETWORK TOGETHER Logging Off 7-4 Planning Your Network 4-1 Automatic Logout 7-4 ATM Configuration Rules 4-2 Extending VLANs Through the ATM Network 4-2 8 MANAGING THE ATM MODULE ATM Connections Within Your Network 4-3 Configuring an ATM Port 8-2 Extending VLANs into the ATM Network 8-4 5 NETWORK CONFIGURATION EXAMPLES Displaying all VLANs 8-5 ATM Backbone in the Building 5-1 ATM Port Setup 8-6 Campus Configuration 5-2 Mapping Far End MAC Addresses 8-8 Making a B
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A SAFETY INFORMATION F NOTICES, TRADEMARKS, AND WARRANTIES Safety Notices A-1 Trademarks F-1 World Trade Safety Information A-1 Statement of Limited Warranty F-2 Production Status F-2 The IBM Warranty for Machines F-2 B SCREEN ACCESS RIGHTS Warranty Service F-3 Extent of Warranty F-3 C ATM MODULE TECHNICAL SPECIFICATIONS Limitation of Liability F-4 Environmental Specifications C-1 Electronic Emission Notices F-5 ATM Cable Specification C-1 Federal Communications Commission (FCC) Statement Does
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ABOUT THIS GUIDE The device into which the ATM Module is fitted, is Introduction known simply as the Switch. An example of a Switch is the IBM 8271 Nways Ethernet LAN Switch This guide provides the information that you need to Model 624. install and configure the IBM 8271 Nways Ethernet LAN Switch ATM OC-3c Module (agent software This type of Switch is often referred to as an version 1.05) within an IBM 8271 Nways Ethernet edge-device, edge-switch or boundary switch. LAN switch which ha
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■ ■ 2 ABOUT THIS GUIDE Finding Information in This Guide Conventions The following table shows you where to find specific Table 1 and Table 2 list conventions that are used information within this guide. throughout this guide. Table 1 Notice Icons Task Location Icon Notice Type Alerts you to... Learning Chapter 1, ‘Features and Benefits” concepts Chapter 2, ‘Network Layer Concepts” Information Important features or instructions Chapter 3, ‘Virtual LAN Concepts” note Planning your Chapter 1,
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■ ■ Related Documentation 3 Table 2 Text Conventions (continued) Convention Description Words in Italics emphasize a point or denote new terms at the Italics place where they are defined in the text. Words in Bold text denotes key features. bold Related Documentation The ATM OC-3c Module documetation set includes: IBM 8271 Nways Ethernet LAN Switch ATM OC-3c Module Quick Reference Guide. Part Number 02L1333 IBM 8271 Nways Ethernet LAN Switch ATM OC-3c Module Release Notes. Part Number 02L13
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4 ABOUT THIS GUIDE
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■ ■ ■ FEATURES AND BENEFITS 1 This chapter describes the main features of the IBM ATM Benefits 8271 Nways Ethernet LAN Switch ATM OC-3c Module and the benefits of ATM within your ATM is the only technology specifically designed to network. carry voice, video and data traffic simultaneously and to provide the required level of service that these The ATM Module provides a high-speed ATM different applications need in order to run effectively connection between your IBM 8271 Nways Ethernet
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■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 1-2 CHAPTER 1: FEATURES AND BENEFITS High performance with fast data transfer ATM Module Features Wire Rate Transmission on ATM port The following list summarizes the ATM Module Low Latency (68 microseconds when using features. These features are described in more detail Store and Forward traffic management between in this guide. ATM and Ethernet components) Conforms to ATM Forum Standards Resilient Links protect your network against cable OC-
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■ ■ ■ ■ NETWORK LAYER CONCEPTS 2 This guide contains several chapters that describe the Each of the layers in discussed in turn; starting with basic concepts behind ATM technology, and the Upper Layer and working down to the Physical integrating ATM into your existing network: Layer. This chapter describes some of the concepts behind the network layer architecture of a typical ATM network. Chapter 3, “Virtual LAN Concepts” describes how Virtual LANs (VLANs) are extended into the ATM networ
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■ ■ ■ 2-2 CHAPTER 2: NETWORK LAYER CONCEPTS Traffic from one ELAN is not seen on another ELAN, as Upper Layer Protocols they are logically separate broadcast domains. If devices The Upper Layer is the layer in the network architecture from different ELANs need to communicate with each that relates to user applications and service requests. other, they must do so using an ATM router. For example, an application could be file transfer LAN emulation software is contained within ATM software, a
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What is LAN Emulation (LANE)? 2-3 LAN Emulation Components Broadcast and Unknown Server (BUS) Each Emulated LAN (ELAN) is composed of a set of Each ELAN has a Broadcast and Unknown Server (BUS). LAN Emulation components. This section describes The BUS forwards frames that it receives from any each of these components. client to all of the clients in the ELAN. The BUS is used to forward broadcast and multicast frames so that they LAN Emulation Client (LEC) are flooded throughout the ELAN. The
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■ ■ ■ 2-4 CHAPTER 2: NETWORK LAYER CONCEPTS The router shown in Figure 2-2 is not a LAN LAN Emulation Components in Your Network Emulation component, but would be required should Each Emulated LAN consists of a single LANE Service, a device on one Emulated LAN need to communicate and a number of LAN Emulation clients. with a device on another Emulated LAN. A LANE Service consists of: You may wish to have more than one LECS on your A LAN Emulation Server (LES) network for security reasons. F
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■ ■ ■ ■ ■ What is LAN Emulation (LANE)? 2-5 Locating the LECS Joining the ELAN Before the LEC can ask the LECS for the address of Before a LAN Emulation Client (LEC) can transmit any the LES, the LEC must first locate the LECS. There are Ethernet frames onto the ATM network it must first three ways in which the LEC can locate the LECS, and join an ELAN. To join the ELAN: the LEC tries these methods in the following order: 1 The LEC must know the name of the ELAN it is to The LEC can ask th
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■ ■ ■ ■ 2-6 CHAPTER 2: NETWORK LAYER CONCEPTS Mapping Ethernet and ATM Addresses Address Resolution Each device connected to an Ethernet port has one or The process by which a LEC associates a LAN more MAC addresses. destination address with the ATM address of another Address Resolution LEC (or the BUS) is known as . Each ATM device has a number of LAN Emulation clients, and each LAN Emulation Client (LEC) has an Each LEC keeps a LAN Emulation ARP Table (which ATM address. An example of t
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■ ■ ■ ■ What is LAN Emulation (LANE)? 2-7 LAN Emulation Address Resolution Protocol In addition the sending LEC attempts to locate the (LE_ARP) LEC serving the destination address. It does this using the LE_ARP process, described in “LAN An LE_ARP request is sent to the LES to locate the Emulation Address Resolution Protocol (LE_ARP)”. destination MAC address. The LES in turn sends the LE_ARP request to all of the LECs in the Emulated LAN. What Happens to Broadcast and Multicast Frames? LEC
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■ ■ ■ ■ 2-8 CHAPTER 2: NETWORK LAYER CONCEPTS ATM Adaptation Layer (AAL) Asynchronous Transfer Mode (ATM) Layer Asynchronous Transfer Mode (ATM) is a connection- Ethernet frames can be between 64 and 1514 bytes oriented transmission protocol that has the following in length. ATM transmits data in fixed length cells. features: Each cell contains 48 bytes of user data. The ATM Adaptation Layer (AAL) converts data between the ATM uses the Signalling Protocol (Q.2931) to Ethernet and ATM format
