3Com 3CR17450-91 manual Type of Unit Total Units in the Stack Maximum Modules Port, Port Speed

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16CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3870

Some combinations of stacked 24 and 48 port units restrict the number of modules supported by the stack. Table 5 shows which stack configurations restrict the number of supported modules:

Table 5 Maximum Stack Configurations

Type of Unit		Total Units in the Stack	Maximum Modules

48 Port	24 Port
0	8	8	8
8	0	8	0
7	1	8	2
7	0	7	4
6	2	8	4
6	1	7	6
6	0	6	6

Default Settings Table 6 shows the default settings for the Switch 3870. If you initialize one of the Switch units, it is returned to these defaults.

Table 6 Default Settings

Feature	Switch 3870

Port Status	Enabled
Port Speed	Auto-negotiated
Duplex Mode	Auto-negotiated
Flow Control	Disabled
Broadcast Storm Control	Enabled
	High threshold: 3000 broadcast frames per
	second — Notify and filter
	Low threshold: 1500 broadcast frames per
	second — Notify and unfilter
Virtual LANs (VLANs)	All ports belong to the untagged Default VLAN
	(VLAN 1)
Multicast Filtering	IGMP filtering enabled
Rapid Spanning Tree Protocol	Enabled
Link Aggregation Control	Disabled per port
Protocol (LACP)
Spanning Tree Protocol	Enabled
Smart Auto-sensing	Enabled

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Contents SuperStack 3 Switch 3870 Family Getting Started Guide 3Com Corporation Campus Drive Marlborough MA USA United States Government LegendContents Setting UP for Management PIN-OUTS Page About this Guide Conventions Icon DescriptionConvention Description Related DocumentationDocumentation documentation To access the online documentation from the CD-ROM CommentsSwitch 3870Hardware Features Switch Switch Front View Detail1000BASE-T Ports Color Indicates Port Status/Packet LEDs Stacking Status LEDStack Master LED Color Indicates Module LEDs Power/Self Test LEDFault LED Unit LEDView Detail Type of Unit Total Units in the Stack Maximum Modules Port Feature Switch Port StatusDuplex Mode Port SpeedDefault Settings Introducing the Superstack 3 Switch Installing the Switch Package Contents Choosing a SuitableSite Switch, as shown in Figure Power lines and fluorescent lighting fixturesTo rack-mount your Switch Rack-mountingRepeat steps 2 and 3 for the other side of the Switch Fitting a bracket for rack-mountingSwitch Power-upPowered-up and ready for operation SequencePower System output Cross-over Cable Straight-through CableSFP Operation Remove the plastic protective cover if fitted Your Switch TransceiverRemoving an SFP Installing the Switch Setting UP for Management Setting Up OverviewManual IP Configuration Automatic IP ConfigurationSetting UP for Management Manually Configuring IP Information Pre-requisitesConnecting the Workstation to the Switch Setting Up the Switch with IP InformationExample top-level command line interface menu Configured IP ViewingAutomatically Viewing Automatically Configured IP Information Viewing IP Information via the Console Port Refer to Setting Up Command Line Interface Management on Web Interface Command LineInterface Management ManagementNetwork Using Telnet Where xxx.xxx.xxx.xxx is the IP address of the SwitchChoosing a Browser Setting Up WebInterface Over the NetworkSetting Up Snmp Default UsersPasswords User Default Access Level Name Password Security Device User Modify operation on the web interfaceProblem Solving On powering-up, the Power/Self Test LED remains yellow Solving ProblemsPower/Self Test LED does not light Indicated by LEDsSolving Hardware ProblemsRefer to the list of suggested solutions below Port Status LED is flashing green/yellowFan failure warning message is received Unit fails or Snmp thermal shutdown trap is receivedSolving Communication Problems Error message indicating that the SFP transceiver is faultyIP Addressing How do you obtain a registered IP Address? Solving Software Upgrade Problems Problem Solving Safety Information Power Cord Set Japan Important Safety Information This must be approved for the country where it is usedImportant Safety Information ’information de Sécurité Importante Class’information de Sécurité Importante Dispositif Laser De Classe Wichtige Sicherheitsinformationen Vorsicht EuropeInformación de seguridad importante Laser Gerät der KlasseSchuko Appendix a Safety Information Importanti Informazioni di Sicurezza CSASolo Regno Ważne informacje o zabezpieczeniach Appendix a Safety Information Laser Produkt Klasa Appendix a Safety Information PC-AT Serial Cable Null Modem Cable RJ-45 to RS-232 25-pinRJ-45 to 9-pin RJ-45 to RS-232 25-pin Modem CableRJ-45 Pin Assignments Pin Number 10/100 1000Pin Number 10/100 1000 Appendix B PIN-OUTS Switch 3870 24 Port Switch 3870 48 Port Register Your Product to Gain Service BenefitsServices PurchaseContact Us Access SoftwareDownloads Telephone TechnicalAustralia 800 678 Philippines US and Canada Telephone Technical Support and Repair Index SFP Page Chapter Index Regulatory Notices