3Com 5000 ATM manual 6Converting SwitchModule Packets to and from ATM Cells

Page 38

2-6CHAPTER 2: LAN EMULATION OVERVIEW

Packets Versus Cells The ATM Backbone SwitchModule converts Ethernet- and FDDI-originated packets to and from ATM cells.

Figure 2-6 illustrates the conversion of SwitchModule packets to and from ATM cells.

SwitchModule packet

From

ATM

Padding and error correction

Segmentation/

Reassembly

48 Octets

Cells	HDR

				53 Octets
				53 Octets

48 Octets

HDR

53 Octets

48 Octets

HDR

53 Octets

To ATM

HDR = ATM Cell Header (5 octets)

Figure 2-6Converting SwitchModule Packets to and from ATM Cells

Image 38

Contents CoreBuilder 5000 ATM Backbone SwitchModule User Guide Santa Clara, California 3Com CorporationBayfront Plaza 95052-8145Contents LAN Emulation Overview Configuring the ATM Backbone Switchmodule Internet Group Management Protocol Igmp Snooping Troubleshooting Technical Support Figures Page Tables Page Audience About this GuideIntroduction GuideIcon Type Description SETDefault !0 -IP NETaddr =Conventions Convention DescriptionCommands KeysAbout this Guide Related Documents About this Guide ATM Backbone SwitchModuleIntroduction OverviewMultiple Redundancy Levels ATM Forum Specification ComplianceSwitched Virtual Circuit Capacity CoreBuilder 5000 Chassis CompatibilitySupported CoreBuilder SwitchModules Hot Swap Feature Standards ATM Backbone SwitchModule ArchitectureStandards MIBsATM Backbone SwitchModule Architecture 2ATM Backbone SwitchModule Base Configuration DescriptionsATM Backbone SwitchModule Descriptions Backplane PacketChannel plus ATM Cell-Switching SwitchChannelPacketChannel DescriptionSlot, or Sample ATM Backbone SwitchModule Configurations 4Example Base ConfigurationNNI Configuration cards 6Example Dual-Homing/Module Redundancy ConfigurationSample ATM Backbone SwitchModule Configurations 14CHAPTER 1 Introduction LAN Emulation Overview 2ATM Backbone SwitchModule Function LAN Emulation ComponentsBroadcast and Unknown Server BUS Bridgeport-LECVirtual Bridge vbridge Emulated LAN Elan6Converting SwitchModule Packets to and from ATM Cells LAN Emulation Connections Control VCCs8Data VCCs in ATM Backbone SwitchModule LAN Emulation LAN Emulation Operation 10CHAPTER 2 LAN Emulation Overview LAN Emulation Operation 12CHAPTER 2 LAN Emulation Overview Configuring the ATM Backbone Switchmodule Transcend Network Control Services for Unix Configuration Tools Transcend Network Management Software for Windows2Windows Tools for Configuring ATM Backbone SwitchModules Third-Party SNMP-Based ToolsDMM management tools Setting Up DMMAccess DMM DMMLAN Emulation Configuration ConfigurationConfiguration Bridge ConfigurationATM Configuration CB5000 set atm slot universion versionParameters Configuring LANEmulation OC-3 Card Configuring ATMCB5000 set module slot.1 phyautomaticfailover enable RedundancyCB5000 set module 9.1 igmpsnooping enable Configuring IgmpCB5000 set atm slot.1 lossofsignallingdelay seconds CB5000 set vbridge 1 igmpsnooping mode enableCB5000 reset module CB5000 show vbridge 1 igmpsnooping status12CHAPTER 3 Configuring the ATM Backbone Switchmodule Status Monitoring Statistics Displaying General Vbridge Configuration Information CB5000 show vbridge all configuration noverboseDisplaying Detailed Vbridge Configuration Information CB5000 show vbridge all configuration verboseOption Information Shown Displaying Igmp Snooping Vbridge InformationCB5000 show vbridge 11 igmpsnooping status CB5000 show module 4.1 verbose Displaying General Status Information CB5000 show bridgeport 4.allDisplaying Detailed Information CB5000 show bridgeport 4.2 verboseCB5000 show counter bridgeport 4.2 interface CB5000 show count bridgeport 4.2 igmpsnoopingCB5000 show atm 4 interface LearpCB5000 show atm 4 ilmiconfiguration CB5000 show atm 4 q93bCB5000 show atm 4 signalconfiguration CB5000 show atm 4 qsaalCB5000 show atm 4 statistics CB5000 show atm 4 trafficdescriptor allCB5000 show atm 4 vcc all CB5000 show bportlec 4.2 configuration BUSCB5000 show bportlec 4.2 statistics CB5000 show bportlec 4.2 statusCB5000 show bportlec 4.2 servercircuits CB5000 show bportlec 4.2 learptable allCB5000 show sonet 13.1 status CB5000 show sonet 7.1 statistics interval all SectionlinepathCB5000 show igmpsnooping module Ianaiftype MIB Using Graphical Interface Tools 22CHAPTER 4 Status Monitoring and Statistics Internet Group Management Protocol Igmp Snooping Before implementing Igmp snooping Shows a typical packet path before snooping occurs 2Format of an Igmp Version 1 Message Overview Locating Multicast CoreBuilderSupport RoutersEnabling Igmp Snooping on CoreBuilder 5000 SwitchModules Shows a typical FTE Dram address forwarding entry Verifying Base Module LED Operation TroubleshootingTroubleshooting Using LEDs Reading the Base Module LEDs Module Status LED StateDetermining Corrective Action LED State Possible Cause Corrective ActionActive DMM CB5000 show module all6CHAPTER 6 Troubleshooting Card Functions Card functions CB5000 set atm slot universion Signaling FunctionsCB5000 show atm slot interface Functions CB5000 show bportlec slot.lec configurationCB5000 set bportlec slot.lec mode enable CB5000 show atm slot vcc allCB5000 show bportlec slot.lec status CB5000 show counter bridgeport slot.lec interface CB5000 show bridgeport slot.lec verboseCB5000 show atm slot statistics Power up self-test diagnostics Obtaining Technical Assistance 14CHAPTER 6 Troubleshooting Environmental SpecificationsSpecifications MechanicalSpecification Value PowerATM OC-3 Card Fiber Optic Specifications Technical Support ServicesServices Online TechnicalHostname ftp.3com.com Access by Analog ModemPassword your Internet e-mail address Country Data Rate Telephone Number408 727 Access by Digital Modem847 262 Europe, South Africa, and Middle East Country Telephone Number Asia, Pacific RimCountry Telephone Number Fax Number 6APPENDIX B Technical Support Index NumbersLane URL B-1 Index 3Com Corporation Limited Warranty Warranties Exclusive