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3Com 3CDSG10PWR User Guide - Page 226

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UPC - 662705520902

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226 APPENDIX D: TROUBLESHOOTING Problems No connection and the port LED is off Possible Cause Incorrect ethernet cable, e.g., crossed rather than straight cable, or vice versa, split pair (incorrect twisting of pairs) Solution Check pinout and replace if necessary Fiber optical cable connection is reversed Bad cable Wrong cable type Change if necessary. Check Rx and Tx on fiber optic cable Replace with a tested cable Verify that all 10 Mbps connections use a Cat 5 cable Lost Password Check the port LED or zoom screen in the NMS application, and change setting if necessary Contact 3Com

Section	Page
3Com® OfficeConnect Managed Gigabit PoE Switch User Guide	1
About This Guide	3
User Guide Overview	3
Intended Audience	5
Conventions	5
Related Documentation	5
Contents	6
Getting Started	13
About the OfficeConnect Managed Gigabit PoE Switch	14
Summary of Hardware Features	14
Front Panel Detail	15
LED Status Indicators	16
System Specifications	17
Installing the Switch	18
Setting Up for Management	19
Methods of Managing a Switch	19
Web Interface Management	19
SNMP Management	20
Switch Setup Overview	20
IP Configuration	22
Automatic IP Configuration using DHCP	22
Manual IP Configuration	22
Using the Command Line Interface (CLI)	23
Connecting to the Console Port	23
Prerequisites	23
Connecting the Workstation to the Switch	24
Manually set the IP Address using the Console Port	24
Viewing IP Information using the Console Port	25
Setting Up Web Interface Management	27
Prerequisites	27
Choosing a Browser	27
Web Management Over the Network	28
Setting Up SNMP Management V1 or V2	28
Default Users and Passwords	29
Upgrading Software using the CLI	29
Using the 3Com Web Interface	30
Starting the 3Com Web Interface	31
Multi-Session Web Connections	31
Accessing the 3Com Web Interface	32
Understanding the 3Com Web Interface	33
Device Representation	35
Using the 3Com Web Interface Management Buttons	35
Using Screen and Table Options	36
Viewing Configuration Information	36
Adding Configuration Information	37
Modifying Configuration Information	38
Removing Configuration Information	39
Saving the Configuration	40
Resetting the Device	41
Restoring Factory Defaults	43
Logging Off the Device	44
Viewing Basic Settings	45
Viewing Device Settings	46
Viewing Color Keys	48
Managing Device Security	49
Configuring System Access	50
Viewing System Access Settings	51
Defining System Access	52
Modifying System Access	53
Removing System Access	54
Defining RADIUS Clients	55
Defining Port-Based Authentication (802.1X)	57
Viewing 802.1X Authentication	58
Defining 802.1X Authentication	60
Defining Access Control Lists	62
Viewing MAC Based ACLs	63
Configuring MAC Based ACLs	64
Modifying MAC Based ACLs	67
Removing MAC Based ACLs	69
Viewing IP Based ACLs	71
Defining IP Based ACLs	72
Modifying IP Based ACLs	77
Removing IP Based ACLs	80
Viewing ACL Binding	83
Configuring ACL Binding	84
Removing ACL Binding	85
Enabling Broadcast Storm	86
Managing System Information	88
Viewing System Description	89
Defining System Settings	91
Configuring System Name	92
Configuring System Time	93
Saving the Device Configuration	96
Resetting the Device	97
Configuring Ports	98
Viewing Port Settings	99
Defining Port Settings	102
Viewing Port Details	104
Aggregating Ports	106
Viewing Link Aggregation	107
Configuring Link Aggregation	107
Modifying Link Aggregation	110
Removing Link Aggregation	112
Viewing LACP	113
Modifying LACP	114
Configuring VLANs	116
Viewing VLAN Details	117
Viewing VLAN Port Details	118
Creating VLANs	119
Modifying VLAN Settings	121
Modifying Port VLAN Settings	123
Removing VLANs	124
Configuring IP and MAC Address Information	125
Defining IP Addressing	126
Configuring ARP Settings	127
Viewing ARP Settings	128
Defining ARP Settings	129
Removing ARP Entries	130
Configuring Address Tables	132
Viewing Address Table Settings	133
Viewing Port Summary Settings	134
Adding MAC Addresses to the Address Table	136
Defining Aging Time	138
Removing Address Table Ports	139
Removing MAC Addresses from the Address Table	141
Configuring IGMP Snooping	143
Defining IGMP Snooping	144
Configuring Spanning Tree	146
Viewing Spanning Tree	147
Defining Spanning Tree	150
Modifying Spanning Tree	153
Configuring SNMP	155
Defining SNMP Communities	156
Removing SNMP Communities	158
Defining SNMP Traps	159
Removing SNMP Traps	160
Configuring Quality of Service	162
Viewing CoS Settings	163
Defining CoS	164
Viewing CoS to Queue	165
Defining CoS to Queue	165
Viewing DSCP to Queue	167
Configuring DSCP Queue	168
Configuring Trust Settings	169
Viewing Bandwidth Settings	170
Defining Bandwidth Settings	172
Defining Voice VLAN	174
Viewing Voice VLANs	175
Defining Voice VLAN	176
Defining Voice VLAN Port Settings	177
Viewing Voice VLAN Port Definitions	179
Viewing the OUI Summaries	180
Modifying OUI Definitions	182
Managing System Files	184
Backing Up System Files	186
Restoring Files	187
Restore the Software Image	188
Activating Image Files	189
Managing Power over Ethernet Devices	190
Viewing PoE Settings	191
Defining PoE Settings	193
Managing System Logs	195
Viewing Logs	196
Configuring Logging	197
Viewing Statistics	200
Viewing Port Statistics	201
Managing Device Diagnostics	204
Configuring Port Mirroring	205
Defining Port Mirroring	206
Removing Port Mirroring	208
Viewing Cable Diagnostics	209
Configuring Cable Diagnostics	210
3Com Network Management	212
3Com Network Supervisor	212
3Com Network Director	213
3Com Network Access Manager	213
3Com Enterprise Management Suite	214
Integration Kit with HP OpenView Network Node Manager	214
Device Specifications and Features	215
Related Standards	215
Environmental	215
Physical	215
Electrical	216
Switch Features	216
Pin-Outs	221
Null Modem Cable	221
PC-AT Serial Cable	221
Modem Cable	222
Ethernet Port RJ-45 Pin Assignments	222
Troubleshooting	224
Problem Management	224
Troubleshooting Solutions	224
3Com CLI Reference Guide	227
Getting Started with the Command Line Interface	227
Console Port	227
Logging on to the CLI	227
Automatic Logout	228
Concurrent CLI Sessions	228
CLI Commands	228
?	229
Syntax	229
Default Configuration	229
User Guidelines	229
Example	229
Ping	230
Syntax	230
Parameters	230
Default Configuration	230
User Guidelines	230
Example	230
Summary	231
Syntax	231
Default Configuration	231
User Guidelines	231
Example	231
ipSetup	232
Syntax	232
Parameters	232
Default Configuration	232
User Guidelines	232
Example	232
Upgrade	233
Syntax	233
Parameters	233
Default Configuration	233
User Guidelines	233
Initialize	234
Syntax	234
Default Configuration	234
User Guidelines	234
Example	234
Reboot	235
Syntax	235
Default Configuration	235
User Guidelines	235
Example	235
Logout	236
Syntax	236
Default Configuration	236
User Guidelines	236
Example	236
Password	237
Syntax	237
Default Configuration	237
User Guidelines	237
Example	237
Glossary	238
Obtaining Support for Your 3Com Products	244
Register Your Product to Gain Service Benefits	244
Solve Problems Online	244
Purchase Extended Warranty and Professional Services	244
Access Software Downloads	245
Contact Us	245
Telephone Technical Support and Repair	245