Problems Possible Cause Solution | 3Com 3CRDSF9PWR manual

240APPENDIX D: TROUBLESHOOTING

■No connection and the port LED is off

■Lost Password.

	Problems	Possible Cause	Solution


	Cannot connect to		Be sure the terminal emulator program is set to VT-100
	management using		compatible, 38400 baud rate, no parity, 8 data bits
	RS-232 serial connection		and one stop bit
			Use the included cable, or be sure that the pin-out
			complies with a standard null-modem cable

	Cannot connect to		Be sure the switch has a valid IP address, subnet mask
	switch management		and default gateway configured
	using HTTP, SNMP, etc.		Check that your cable is properly connected with a
			Check that your cable is properly connected with a
			valid link light, and that the port has not been disabled
			Ensure that your management station is plugged into
			the appropriate VLAN to manage the device
			If you cannot connect using Telnet or the web, the
			maximum number of connections may already be
			open. Please try again at a later time.

	No response from the	Faulty serial cable	Replace the serial cable
	terminal emulation	Incorrect serial cable	Replace serial cable for a pin-to-pin straight/flat cable
	software	Incorrect serial cable	Replace serial cable for a pin-to-pin straight/flat cable
	software	Software settings	Reconfigure the emulation software connection
		Software settings	Reconfigure the emulation software connection
			settings.

	Response from the	Faulty serial cable	Replace the serial cable
	terminal emulations	Software settings	Reconfigure the emulation software connection
	software is not readable	Software settings	Reconfigure the emulation software connection
	software is not readable		settings.
			settings.

	Self-test exceeds 20	The device may not be	Remove and reinstall the device. If that does not help,
	seconds	correctly installed.	consult your technical support representative.

	No connection is	Wrong network address	Configure the network address in the workstation
	established and the port	in the workstation
	LED is on	No network address set	Configure the network address in the workstation
		No network address set	Configure the network address in the workstation
		Wrong or missing	Configure the workstation with IP protocol
		protocol
		Faulty Ethernet cable	Replace the cable
		Faulty port	Consult your technical support representative
		Faulty SFP transceiver	Replace the SFP transceiver
		Incorrect initial	Erase the connection and reconfigure the port
		configuration

	Device is in a reboot loop	Software fault	Download and install a working or previous software
			version from the console

Image 240

3Com 3CRDSF9PWR manual No connection and the port LED is off Lost Password, Problems Possible Cause Solution

Contents

3Com OfficeConnect Managed PoE Switch 3Com Corporation Campus Drive Marlborough User Guide OverviewManaging System Information Provides information for About this Guide Conventions RelatedDocumentation Lists conventions that are used throughout this guide About this Guide Contents Viewing Basic Settings Configuring Ports Configuring Igmp Snooping Managing System Files Managing Device Diagnostics -O UTS Troubleshooting Page Getting Started Switch AboutOfficeConnect Managed Fast OfficeConnect Managed Fast Ethernet PoE Switch-front panel Indicators OfficeConnect Managed Fast Ethernet PoE switch provides LEDLED Status Describes the meanings of the LEDs Specifications Fast Ethernet PoE switchSystem Installing Setting Up for Methods of Managing a SwitchManagement Refer to Setting Up Web Interface Management on Refer to Setting Up Command Line Interface Management on Switch Setup Refer to Setting Up Snmp Management V1 or V2 onConfigure IP information manually for your switch or view Automatically configured IP information Initial Switch Setup and Management Flow Diagram Automatic IP Configuration using Dhcp Manual IP Configuration Interface CLI Prerequisites Connecting the Workstation to the Switch Manually set the IP Address using the Console Port Console#configure Console#show ip interface Setting Up Web InterfaceChoosing a Browser Setting Up Command LineInterface Management Over the Network Network Using Telnet Where xxx.xxx.xxx.xxx is the IP address of the switch Upgrading Software using Default Users Enter y and press Return. The system reboots the switch Following prompt displays Using the 3COM WEB Interface Accessing the 3Com Web Interface Starting the 3ComWeb Interface Multi-Session Web Connections Enter Network Password Web Interface Understanding 3Com Web Interface 3Com Web Interface Home Following table lists the user interface components Interface Components View Description To access the Device Representation Click Device Summary Device ViewManagement Buttons Using Screen To view configuration informationTable Options Click Administration IP Setup. The IP Setup Page opens IP Setup Modify the fields Click . The access fields are modified System Access Modify Configuration Configuration to be saved to the flash memoryTo save the device configuration Click . The configuration is saved Resetting the Device Click Administration Reset. The Reset Page opensClick . a confirmation message is displayed Reboot in 15 seconds Password is displayedClick Defaults Restores device factory defaultsTo restore the device Restoring Factory Logging Off DeviceTo log off the device Following message appears Viewing Basic Settings To view the Device Summary Settings Device Summary Page contains the following fields Polling Interval Page contains the following fields Polling Interval Click Device Summary Color Key. The Color Key Page opens Color Key Managing Device Security Managing Device Security System Access Summary To define System Access Interface To modify System Access Click . The Users are deleted, and the device is updated To remove users To configure the Radius client Managing Device Security Authentication Defining Port-Based802.1X Click Security 802.1X Summary. The 802.1X Summary Page opens Defining Port-Based Authentication 802.1X System Setting Port SettingsClick Security 802.1X Setup. The 802.1X Setup Page opens Defining Port-Based Authentication Defining Local DatabaseForwarded on to the originally requested web Authentication To configure Local Database SettingsLocal Database Setup Page contains the following fields Local Database Port Detail Local Database Port Setup Page contains the following fields To display the users stored in the Local Database User Name The name of users stored in the local database To create user entries in the Local Database Create a UserSummary Local Database User Modify To remove a user entry from the Local Database Local Database User Remove Encrypting Connection to To configure Https settings Client and server establish a secure encrypted connection Disabled Https is disabled on the device Https//deviceportnumber Https Download Certificate Managing Device Security Switch supports both SSH Version 1.5 and 2.0 clients To view the DSA and RSA keys Click Security SSH Host Key. The SSH Host Key Page opensSSH Host Key Page contains the following fields Must use this web page to create a public host key SSH Key Generate Defining Access Access Control Lists ACLs allow network managers to defineControl Lists Filters that determine traffic classifications MAC Based ACL Summary To configure MAC-based ACLs Click Device ACL MAC Based ACL Setup. The MAC Based ACL Add Rules to ACL Select Create ACL To define a new MAC-based ACL rule Click Device ACL MAC Based ACL Remove. The MAC Based ACL Check Remove ACL IP Based ACL Summary Defining Access Control Lists To configure IP-based ACLs Click Device ACL IP Based ACL Setup. The IP Based ACL SetupOpens Add Rules to ACL Managing Device Security To create a new IP-based ACL Click Device ACL IP Based ACL Remove. The IP Based ACL Updated ACL Binding Summary ACL Binding Setup To define ACL Binding To remove ACL Binding ACL Binding Remove Managing Device Security Settings To display the storm control settingsStorm Control For all ports Configuring To configure Broadcast Storm ControlControl Define the relevant fields Using Broadcast Storm Control Managing Device Security Information Device View Viewing System Description Settings System settings. The section includes the following topicsConfiguring the System Name Configuring System Time To configure the System Name Device To configure the System Time System Time Setup Defining System Settings Saving the Device Saved to the flash memory To reset the device configuration Managing System Information Configuring Ports Port Administration Summary 115 To configure Port Settings Port Administration Setup 117 Click Port Administration Detail. The Port Detail Page opens 119 Configuring Ports Aggregating Ports Link Aggregation Summary To create Link Aggregation Blue Displays a member of the aggregation being created Summary Deselected ports To modify Link Aggregation Link Aggregation Modify Page includes the following fieldsBlue Displays a member of the modified aggregation Summary To remove Link Aggregation Link Aggregation Remove Page includes the following fields Lacp Summary Lacp Modify Aggregating Ports Configuring Vlans Click Device Vlan Vlan Detail. The Vlan Detail Page opens Vlan Vlan Port Detail Click Device Vlan Setup. The Vlan Setup Page opens Vlan Setup Page contains the following fieldsCreate VLANs To create VLANs To rename VLANs Click Device Vlan Rename. The Vlan Rename Page opens To edit Vlan Settings Click Device Vlan Modify VLAN. The Modify Vlan Page opens 137 To modify Port Vlan Settings Click Device Vlan Modify Port. The Modify Port Page opens To delete VLANs Click Device Vlan Remove. The Vlan Remove Page opens Configuring Vlans Address Information IP Setup Page contains the following fields Defining IPAddressing To define an IP interface Configuring ARP Settings ARP Settings Summary To configure ARP entries ARP Settings Setup ARP Settings Remove To remove ARP entries Configuring ARP Settings Configuring IP and MAC Address Information Table Settings To view address table settings Port Summary Configuring Igmp Snooping To configure Igmp Snooping Click Device Igmp Snooping Setup. The Igmp Snooping Vlan Settings Configuring Igmp Snooping Configuring Spanning Tree Spanning Tree Summary 157 To configure Spanning Tree Setup Spanning Tree 159 Spanning Tree Port Setup To modify Spanning Tree Recommended STA Path Cost Range Configuring Spanning Tree Configuring Snmp Snmp version Snmp version 2c Click Administration Snmp Setup. The Snmp Setup Page opens To set the operational status for Snmp Click Administration Snmp Snmp Add. The Snmp Add Page opens To define Snmp communities Community String Snmp TrapSnmp Add Page contains the following fields Remove Community String Removing SnmpCommunities To remove Snmp communities or traps Remove Snmp Trap Service Click Device QoS CoS Summary. The CoS Summary Page opens CoS Summary To configure CoS Settings Click Device QoS CoS Setup. The CoS Setup Page opens To configure the queue mode Click Device QoS Queue. The Queue Setup Page opens CoS to Queue Summary To configure CoS values to queues With 0 representing the lowest queue and 3 as the highest To view the Dscp to CoS mapping Dscp to CoS Summary Dscp to CoS Setup To map Dscp to CoS values Click Device QoS Trust Setup. The Trust Setup Page opens Trust Setup Page contains the following fields Ingress Rate Limit Bandwidth Summary Egress Shaping Rates To configure Bandwidth Settings Bandwidth Setup Page contains the following fieldsBe applied to the egress traffic on a specified interface Egress Shaping Rate Configuring Quality of Service Voice Vlan Summary To configure Voice Vlan Settings Voice Vlan Setup Voice Vlan is defined, and the device is To configure Voice Vlan port settings Voice Vlan Port Setup Device is updated To view Voice Vlan Port Detail Settings Port DefinitionsFor specific ports Configuring Voice Vlan To view Voice Vlan OUI Settings OUI ListVoice Vlan OUI Summary Page contains the following fields To modify Voice Vlan OUI Settings Voice Vlan OUI Modify Page contains the following fields Configuring Quality of Service Managing System Files Managing System Files Configuration Upload To backup System files Configuration Download To restore System files Restoring SoftwareTo download the software image Software Download Managing System Files Ethernet Devices Device Power Display Port PoE Summary Page displays the following information Port Power Display To configure Port PoE Settings Click Port PoE Setup. The Port PoE Setup Page opens 203 Managing Power Over Ethernet Devices Managing System Logs System Log Severity Levels To view Logging Logging Display Logging Setup Page contains the following fields To define Log Parameters Managing System Logs Viewing Statistics To view port statistics Port Statistics Summary Port Statistics Summary Page Field Description Port Statistics Summary Page Field Description 213 Port Statistics Summary Page Field Description Managing Device Diagnostics Port mirroring is not supported for trunk ports To enable port mirroring Port Mirroring Setup Managing Device Diagnostics To remove port mirroring Port Mirroring Remove To view cables diagnostics Cable Diagnostics Summary Configuring Cable Diagnostics Diagnostics To test cables Using the command line interface to ping another device Pinging AnotherRequest packets to another node on the network Press Esc to stop pinging 3Com Network Supervisor Access Manager Director HP OpenView Network NodeManager Application such as 3Com Enterprise Management Suite EMS Appendix a 3COM Network Management Environmental Physical Feature Description Electrical Switch Features Interface with Crossover Mdix SSL Appendix B Device Specifications and Features PC-AT Serial Cable Null Modem Cable RJ-45 to RS-232 25-pin Ethernet Port RJ-45 Pin Assignments 10/100 and 1000BASE-T RJ-45 connections Ethernet Port RJ-45 Pin Assignments Appendix C PIN-OUTS Problem TroubleshootingSolutions No connection and the port LED is off Lost Password Problems Possible Cause Solution Problems Possible Cause Solution Appendix D Troubleshooting Access Control List Address ResolutionBoot Protocol Service Dscp Appendix E Glossary Ieee 802.3u IeeeIgmp Snooping Igmp Query Port Authentication See Ieee Link Aggregation See Port Trunk Remote Remote MonitoringProtocol Rstp Secure Shell SSH Byte blocks and error-corrected Though located on the same LANXModem Service Benefits Register YourProduct to Gain TTroubleshoot Warranty ServicesAccess Software Purchase Extended Must apply for a user name and password Contact UsNext section Directory of 3Com resources by region at 00800 4411 Contact Us Appendix F Obtaining Support for Your 3COM Products Regulatory Notices