D-Link xStack DGS-3420 Series User manual

xStack® DGS-3420 Series Layer 2 Managed Stackable Gigabit Switch Web UI Reference Guide
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Information in this document is subject to change without notice.
© 2011 D-Link Corporation. All rights reserved.
Reproduction of this document in any manner whatsoever without the written permission of D-Link Corporation is strictly forbidden.
Trademarks used in this text: D-Link and the D-LINK logo are trademarks of D-Link Corporation; Microsoft and Windows are registered
trademarks of Microsoft Corporation.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products.
D-Link Corporation disclaims any proprietary interest in trademarks and trade names other than its own.
December 2011 P/N 651GS3420025G

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Table of Contents
Intended Readers............................................................................................................................................................1
Typographical Conventions.............................................................................................................................................1
Notes, Notices and Cautions...........................................................................................................................................1
Safety Instructions...........................................................................................................................................................1
Safety Cautions ...........................................................................................................................................................2
General Precautions for Rack-Mountable Products........................................................................................................3
Protecting Against Electrostatic Discharge.....................................................................................................................4
Chapter 1 Web-based Switch Configuration...........................................................................5
Introduction......................................................................................................................................................................5
Login to the Web Manager..............................................................................................................................................5
Web-based User Interface..............................................................................................................................................6
Areas of the User Interface..........................................................................................................................................6
Web Pages......................................................................................................................................................................7
Chapter 2 System Configuration..............................................................................................8
Device Information ..........................................................................................................................................................8
System Information Settings...........................................................................................................................................9
Port Configuration .........................................................................................................................................................10
Port Settings..............................................................................................................................................................10
Port Description Settings...........................................................................................................................................11
Port Error Disabled....................................................................................................................................................12
Port Auto Negotiation Information .............................................................................................................................13
Jumbo Frame Settings ..............................................................................................................................................13
PoE................................................................................................................................................................................14
PoE System Settings.................................................................................................................................................15
PoE Port Settings ......................................................................................................................................................16
Serial Port Settings .......................................................................................................................................................17
Warning Temperature Settings.....................................................................................................................................17
System Log configuration..............................................................................................................................................18
System Log Settings..................................................................................................................................................18
System Log Server Settings......................................................................................................................................19
System Log................................................................................................................................................................19
System Log & Trap Settings......................................................................................................................................20
System Severity Settings...........................................................................................................................................21
Time Range Settings.....................................................................................................................................................22
Port Group Settings.......................................................................................................................................................22
Time Settings ................................................................................................................................................................23
User Accounts Settings.................................................................................................................................................23
Command Logging Settings..........................................................................................................................................25
Stacking.........................................................................................................................................................................25
Stacking Device Table...............................................................................................................................................27
Stacking Mode Settings.............................................................................................................................................27
Chapter 3 Management...........................................................................................................29
ARP...............................................................................................................................................................................29
Static ARP Settings...................................................................................................................................................29
Proxy ARP Settings...................................................................................................................................................30
ARP Table .................................................................................................................................................................30
Gratuitous ARP .............................................................................................................................................................31

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Gratuitous ARP Global Settings................................................................................................................................31
Gratuitous ARP Settings............................................................................................................................................31
IPv6 Neighbor Settings .................................................................................................................................................32
IP Interface....................................................................................................................................................................33
System IP Address Settings......................................................................................................................................33
Interface Settings.......................................................................................................................................................35
Loopback Interface Settings......................................................................................................................................38
Management Settings ...................................................................................................................................................39
Out of Band Management Settings...............................................................................................................................40
Session Table................................................................................................................................................................41
Single IP Management..................................................................................................................................................41
Single IP Settings ......................................................................................................................................................43
Topology....................................................................................................................................................................43
Firmware Upgrade.....................................................................................................................................................50
Configuration File Backup/Restore............................................................................................................................50
Upload Log File .........................................................................................................................................................51
SNMP Settings..............................................................................................................................................................51
SNMP Global Settings...............................................................................................................................................52
SNMP Traps Settings................................................................................................................................................52
SNMP Linkchange Traps Settings ............................................................................................................................53
SNMP View Table Settings .......................................................................................................................................54
SNMP Community Table Settings.............................................................................................................................54
SNMP Group Table Settings.....................................................................................................................................55
SNMP Engine ID Settings .........................................................................................................................................56
SNMP User Table Settings........................................................................................................................................57
SNMP Host Table Settings........................................................................................................................................58
SNMPv6 Host Table Settings....................................................................................................................................58
RMON Settings..........................................................................................................................................................59
SNMP Community Encryption Settings.....................................................................................................................60
SNMP Community Masking Settings ........................................................................................................................60
Telnet Settings ..............................................................................................................................................................61
Web Settings.................................................................................................................................................................61
Power Saving Settings..................................................................................................................................................61
Chapter 4 L2 Features.............................................................................................................63
VLAN.............................................................................................................................................................................63
802.1Q VLAN Settings ..............................................................................................................................................68
802.1v Protocol VLAN...............................................................................................................................................71
Asymmetric VLAN Settings .......................................................................................................................................73
GVRP.........................................................................................................................................................................73
MAC-based VLAN Settings.......................................................................................................................................75
Private VLAN Settings...............................................................................................................................................76
PVID Auto Assign Settings........................................................................................................................................78
Subnet VLAN.............................................................................................................................................................78
Voice VLAN ...............................................................................................................................................................79
VLAN Trunk Settings.................................................................................................................................................82
Browse VLAN ............................................................................................................................................................83
Show VLAN Ports......................................................................................................................................................84
QinQ..............................................................................................................................................................................84
QinQ Settings ............................................................................................................................................................86
VLAN Translation Settings ........................................................................................................................................87

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Layer 2 Protocol Tunneling Settings.............................................................................................................................87
Spanning Tree...............................................................................................................................................................88
STP Bridge Global Settings.......................................................................................................................................90
STP Port Settings......................................................................................................................................................91
MST Configuration Identification ...............................................................................................................................93
STP Instance Settings...............................................................................................................................................94
MSTP Port Information..............................................................................................................................................94
Link Aggregation ...........................................................................................................................................................95
Port Trunking Settings...............................................................................................................................................97
LACP Port Settings....................................................................................................................................................98
FDB...............................................................................................................................................................................98
Static FDB Settings ...................................................................................................................................................98
MAC Notification Settings........................................................................................................................................100
MAC Address Aging Time Settings.........................................................................................................................101
MAC Address Table ................................................................................................................................................101
ARP & FDB Table....................................................................................................................................................102
L2 Multicast Control ....................................................................................................................................................103
IGMP Proxy .............................................................................................................................................................103
IGMP Snooping .......................................................................................................................................................105
MLD Proxy...............................................................................................................................................................113
MLD Snooping.........................................................................................................................................................115
Multicast VLAN........................................................................................................................................................123
IP Multicast VLAN Replication.................................................................................................................................130
Multicast Filtering ........................................................................................................................................................133
IPv4 Multicast Filtering ............................................................................................................................................133
IPv6 Multicast Filtering ............................................................................................................................................135
Multicast Filtering Mode...........................................................................................................................................138
ERPS Settings.............................................................................................................................................................139
LLDP ...........................................................................................................................................................................142
LLDP........................................................................................................................................................................142
LLDP-MED...............................................................................................................................................................150
NLB FDB Settings.......................................................................................................................................................152
PTP .............................................................................................................................................................................153
PTP Global Settings ................................................................................................................................................154
PTP Port Settings....................................................................................................................................................154
PTP Boundary Clock Settings.................................................................................................................................155
PTP Boundary Port Settings ...................................................................................................................................156
PTP Peer to Peer Transparent Port Settings..........................................................................................................157
PTP Clock Information.............................................................................................................................................157
PTP Port Information...............................................................................................................................................158
PTP Foreign Master Records Port Information.......................................................................................................158
Chapter 5 L3 Features...........................................................................................................159
IPv4 Static/Default Route Settings..............................................................................................................................159
IPv4 Route Table ........................................................................................................................................................160
IPv6 Static/Default Route Settings..............................................................................................................................160
IPv6 Route Table ........................................................................................................................................................161
IP Forwarding Table....................................................................................................................................................162
Route Preference Settings..........................................................................................................................................162
Route Redistribution Settings......................................................................................................................................163
IP Tunnel.....................................................................................................................................................................163

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IP Tunnel Settings ...................................................................................................................................................163
IP Tunnel GRE Settings ..........................................................................................................................................164
RIP ..............................................................................................................................................................................167
RIP Settings.............................................................................................................................................................168
RIPng.......................................................................................................................................................................170
Chapter 6 QoS........................................................................................................................172
802.1p Settings ...........................................................................................................................................................173
802.1p Default Priority Settings...............................................................................................................................173
802.1p User Priority Settings...................................................................................................................................174
Bandwidth Control.......................................................................................................................................................175
Bandwidth Control Settings.....................................................................................................................................175
Queue Bandwidth Control Settings .........................................................................................................................176
Traffic Control Settings................................................................................................................................................177
HOL Blocking Prevention............................................................................................................................................180
Scheduling Settings ....................................................................................................................................................180
QoS Scheduling.......................................................................................................................................................180
QoS Scheduling Mechanism...................................................................................................................................181
Chapter 7 ACL........................................................................................................................183
ACL Configuration Wizard...........................................................................................................................................183
Access Profile List.......................................................................................................................................................184
Adding an Ethernet ACL Profile ..............................................................................................................................185
Adding an IPv4 ACL Profile.....................................................................................................................................189
Adding an IPv6 ACL Profile.....................................................................................................................................193
Adding a Packet Content ACL Profile .....................................................................................................................197
CPU Access Profile List..............................................................................................................................................201
Adding a CPU Ethernet ACL Profile........................................................................................................................202
Adding a CPU IPv4 ACL Profile ..............................................................................................................................206
Adding a CPU IPv6 ACL Profile..............................................................................................................................210
Adding a CPU Packet Content ACL Profile.............................................................................................................213
ACL Finder..................................................................................................................................................................216
ACL Flow Meter...........................................................................................................................................................216
Egress Access Profile List...........................................................................................................................................220
Adding an Ethernet ACL Profile ..............................................................................................................................220
Adding an IPv4 Egress ACL Profile.........................................................................................................................224
Adding an IPv6 Egress ACL Profile.........................................................................................................................228
Egress ACL Flow Meter ..............................................................................................................................................232
Chapter 8 Security.................................................................................................................235
802.1X.........................................................................................................................................................................235
802.1X Global Settings............................................................................................................................................238
802.1X Port Settings................................................................................................................................................239
802.1X User Settings...............................................................................................................................................240
Guest VLAN Settings...............................................................................................................................................241
Authenticator State..................................................................................................................................................242
Authenticator Statistics............................................................................................................................................242
Authenticator Session Statistics..............................................................................................................................243
Authenticator Diagnostics........................................................................................................................................244
Initialize Port-based Port(s).....................................................................................................................................245
Initialize Host-based Port(s) ....................................................................................................................................246
Reauthenticate Port-based Port(s)..........................................................................................................................246
Reauthenticate Host-based Port(s).........................................................................................................................247

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RADIUS.......................................................................................................................................................................247
Authentication RADIUS Server Settings .................................................................................................................247
RADIUS Accounting Settings..................................................................................................................................248
RADIUS Authentication ...........................................................................................................................................248
RADIUS Account Client...........................................................................................................................................250
IP-MAC-Port Binding (IMPB).......................................................................................................................................251
IMPB Global Settings ..............................................................................................................................................251
IMPB Port Settings ..................................................................................................................................................252
IMPB Entry Settings ................................................................................................................................................253
MAC Block List ........................................................................................................................................................254
DHCP Snooping ......................................................................................................................................................254
ND Snooping...........................................................................................................................................................256
MAC-based Access Control (MAC).............................................................................................................................257
MAC-based Access Control Settings ......................................................................................................................257
MAC-based Access Control Local Settings.............................................................................................................259
MAC-based Access Control Authentication State...................................................................................................260
Web-based Access Control (WAC).............................................................................................................................260
WAC Global Settings...............................................................................................................................................263
WAC User Settings..................................................................................................................................................264
WAC Port Settings...................................................................................................................................................264
WAC Authentication State.......................................................................................................................................265
WAC Customize Page.............................................................................................................................................266
Japanese Web-based Access Control (JWAC)..........................................................................................................267
JWAC Global Settings.............................................................................................................................................267
JWAC Port Settings.................................................................................................................................................270
JWAC User Settings................................................................................................................................................270
JWAC Authentication State.....................................................................................................................................272
JWAC Customize Page Language..........................................................................................................................272
JWAC Customize Page...........................................................................................................................................273
Compound Authentication...........................................................................................................................................273
Compound Authentication Settings.........................................................................................................................273
Compound Authentication Guest VLAN Settings....................................................................................................274
Compound Authentication MAC Format Settings ...................................................................................................275
Port Security................................................................................................................................................................276
Port Security Settings..............................................................................................................................................276
Port Security VLAN Settings ...................................................................................................................................278
Port Security Entries................................................................................................................................................278
ARP Spoofing Prevention Settings .............................................................................................................................279
BPDU Attack Protection..............................................................................................................................................279
Loopback Detection Settings ......................................................................................................................................281
Traffic Segmentation Settings.....................................................................................................................................282
NetBIOS Filtering Settings..........................................................................................................................................283
DHCP Server Screening .............................................................................................................................................284
DHCP Server Screening Port Settings....................................................................................................................284
DHCP Offer Permit Entry Settings ..........................................................................................................................285
Access Authentication Control....................................................................................................................................285
Enable Admin ..........................................................................................................................................................286
Authentication Policy Settings.................................................................................................................................287
Application Authentication Settings.........................................................................................................................288
Authentication Server Group Settings.....................................................................................................................288

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Authentication Server Settings................................................................................................................................290
Login Method Lists Settings ....................................................................................................................................291
Enable Method Lists Settings..................................................................................................................................292
Local Enable Password Settings.............................................................................................................................294
SSL Settings................................................................................................................................................................294
SSH.............................................................................................................................................................................297
SSH Settings ...........................................................................................................................................................297
SSH Authentication Method and Algorithm Settings...............................................................................................298
SSH User Authentication List..................................................................................................................................299
DoS Attack Prevention Settings..................................................................................................................................300
Trusted Host Settings..................................................................................................................................................302
Safeguard Engine Settings .........................................................................................................................................303
Chapter 9 Network Application ............................................................................................306
DHCP..........................................................................................................................................................................306
DHCP Relay ............................................................................................................................................................306
DHCP Server...........................................................................................................................................................311
DHCPv6 Server.......................................................................................................................................................318
DHCPv6 Relay ........................................................................................................................................................321
DHCP Local Relay Settings.....................................................................................................................................323
DNS.............................................................................................................................................................................323
DNS Relay...............................................................................................................................................................324
DNS Resolver..............................................................................................................................................................325
DNS Resolver Global Settings ................................................................................................................................325
DNS Resolver Static Name Server Settings ...........................................................................................................326
DNS Resolver Dynamic Name Server Table ..........................................................................................................326
DNS Resolver Static Host Name Settings...............................................................................................................326
DNS Resolver Dynamic Host Name Table..............................................................................................................327
RCP Server Settings...................................................................................................................................................327
SMTP Settings ............................................................................................................................................................328
SNTP...........................................................................................................................................................................330
SNTP Settings.........................................................................................................................................................330
Time Zone Settings .................................................................................................................................................330
UDP.............................................................................................................................................................................332
UDP Helper .............................................................................................................................................................332
Flash File System Settings..........................................................................................................................................334
Chapter 10 OAM.......................................................................................................................336
CFM.............................................................................................................................................................................336
CFM Settings...........................................................................................................................................................336
CFM Port Settings ...................................................................................................................................................342
CFM MIPCCM Table ...............................................................................................................................................343
CFM Loopback Settings..........................................................................................................................................343
CFM Linktrace Settings ...........................................................................................................................................344
CFM Packet Counter...............................................................................................................................................345
CFM Fault Table......................................................................................................................................................346
CFM MP Table ........................................................................................................................................................347
Ethernet OAM..............................................................................................................................................................347
Ethernet OAM Settings............................................................................................................................................347
Ethernet OAM Configuration Settings .....................................................................................................................348
Ethernet OAM Event Log.........................................................................................................................................349
Ethernet OAM Statistics ..........................................................................................................................................350

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DULD Settings.............................................................................................................................................................351
Cable Diagnostics .......................................................................................................................................................351
Chapter 11 Monitoring ............................................................................................................353
Utilization.....................................................................................................................................................................353
CPU Utilization ........................................................................................................................................................353
DRAM & Flash Utilization........................................................................................................................................354
Port Utilization .........................................................................................................................................................354
Statistics......................................................................................................................................................................355
Port Statistics...........................................................................................................................................................355
Packet Size..............................................................................................................................................................365
Mirror...........................................................................................................................................................................367
Port Mirror Settings..................................................................................................................................................367
RSPAN Settings ......................................................................................................................................................369
sFlow...........................................................................................................................................................................370
sFlow Global Settings..............................................................................................................................................370
sFlow Analyzer Server Settings ..............................................................................................................................371
sFlow Flow Sampler Settings..................................................................................................................................372
sFlow Counter Poller Settings.................................................................................................................................372
Ping .............................................................................................................................................................................373
Broadcast Ping Relay Settings................................................................................................................................373
Ping Test..................................................................................................................................................................374
Trace Route.................................................................................................................................................................375
Peripheral....................................................................................................................................................................376
Device Environment ................................................................................................................................................376
External Alarm Settings...........................................................................................................................................377
Chapter 12 Save and Tools.....................................................................................................378
Save Configuration / Log.............................................................................................................................................378
Stacking Information ...................................................................................................................................................378
Download Firmware ....................................................................................................................................................380
Download Firmware from TFTP ..............................................................................................................................380
Download Firmware from RCP................................................................................................................................380
Download Firmware from HTTP..............................................................................................................................381
Upload Firmware.........................................................................................................................................................381
Upload Firmware to TFTP.......................................................................................................................................381
Upload Firmware to RCP.........................................................................................................................................382
Upload Firmware to HTTP.......................................................................................................................................382
Download Configuration..............................................................................................................................................383
Download Configuration from TFTP........................................................................................................................383
Download Configuration from RCP .........................................................................................................................384
Download Configuration from HTTP .......................................................................................................................384
Upload Configuration ..................................................................................................................................................385
Upload Configuration to TFTP.................................................................................................................................385
Upload Configuration to RCP..................................................................................................................................385
Upload Configuration to HTTP................................................................................................................................386
Upload Log File...........................................................................................................................................................387
Upload Log to TFTP................................................................................................................................................387
Upload Log to RCP..................................................................................................................................................387
Upload Log to HTTP................................................................................................................................................388
Reset...........................................................................................................................................................................388
Reboot System............................................................................................................................................................389

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Appendix Section........................................................................................................................390
Appendix A Mitigating ARP Spoofing Attacks Using Packet Content ACL............................................................390
How Address Resolution Protocol works ................................................................................................................390
How ARP Spoofing Attacks a Network....................................................................................................................393
Prevent ARP Spoofing using Packet Content ACL.................................................................................................394
Configuration ...........................................................................................................................................................395
Appendix B Password Recovery Procedure ..........................................................................................................397
Appendix C System Log Entries.............................................................................................................................398
Appendix D Trap Entries ........................................................................................................................................415

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Intended Readers
Typographical Conventions
Notes, Notices and Cautions
Safety Instructions
General Precautions for Rack-Mountable Products
Protecting Against Electrostatic Discharge
The DGS-3420 Series Web UI Reference Guide contains information for setup and management of the Switch.
This manual is intended for network managers familiar with network management concepts and terminology.
Typographical Conventions
Convention Description
[ ] In a command line, square brackets indicate an optional entry. For example: [copy
filename] means that optionally you can type copy followed by the name of the file.
Do not type the brackets.
Bold font Indicates a button, a toolbar icon, menu, or menu item. For example: Open the File
menu and choose Cancel. Used for emphasis. May also indicate system messages
or prompts appearing on screen. For example: You have mail. Bold font is also
used to represent filenames, program names and commands. For example: use the
copy command.
Boldface Typewriter
Font
Indicates commands and responses to prompts that must be typed exactly as
printed in the manual.
Initial capital letter Indicates a window name. Names of keys on the keyboard have initial capitals. For
example: Click Enter.
Menu Name > Menu
Option Menu Name > Menu Option Indicates the menu structure. Device > Port > Port Properties means the Port Properties menu option under the Port menu option that
is located under the Device menu.
Notes, Notices and Cautions
A NOTE indicates important information that helps make better use of the device.
A NOTICE indicates either potential damage to hardware or loss of data and tells how to avoid the
problem.
A CAUTION indicates a potential for property damage, personal injury, or death.
Safety Instructions
Use the following safety guidelines to ensure your own personal safety and to help protect your system from
potential damage. Throughout this safety section, the caution icon ( ) is used to indicate cautions and
precautions that need to be reviewed and followed.

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Safety Cautions
To reduce the risk of bodily injury, electrical shock, fire, and damage to the equipment observe the following
precautions:
•Observe and follow service markings.
oDo not service any product except as explained in the system documentation.
oOpening or removing covers that are marked with the triangular symbol with a lightning bolt may
expose the user to electrical shock.
oOnly a trained service technician should service components inside these compartments.
•If any of the following conditions occur, unplug the product from the electrical outlet and replace the part or
contact your trained service provider:
oDamage to the power cable, extension cable, or plug.
oAn object has fallen into the product.
oThe product has been exposed to water.
oThe product has been dropped or damaged.
oThe product does not operate correctly when the operating instructions are correctly followed.
•Keep your system away from radiators and heat sources. Also, do not block cooling vents.
•Do not spill food or liquids on system components, and never operate the product in a wet environment. If
the system gets wet, see the appropriate section in the troubleshooting guide or contact your trained
service provider.
•Do not push any objects into the openings of the system. Doing so can cause fire or electric shock by
shorting out interior components.
•Use the product only with approved equipment.
•Allow the product to cool before removing covers or touching internal components.
•Operate the product only from the type of external power source indicated on the electrical ratings label. If
unsure of the type of power source required, consult your service provider or local power company.
•To help avoid damaging the system, be sure the voltage selection switch (if provided) on the power supply
is set to match the power available at the Switch’s location:
o115 volts (V)/60 hertz (Hz) in most of North and South America and some Far Eastern countries
such as South Korea and Taiwan
o100 V/50 Hz in eastern Japan and 100 V/60 Hz in western Japan
o230 V/50 Hz in most of Europe, the Middle East, and the Far East
•Also, be sure that attached devices are electrically rated to operate with the power available in your
location.
•Use only approved power cable(s). If you have not been provided with a power cable for your system or for
any AC-powered option intended for your system, purchase a power cable that is approved for use in your
country. The power cable must be rated for the product and for the voltage and current marked on the
product's electrical ratings label. The voltage and current rating of the cable should be greater than the
ratings marked on the product.
•To help prevent electric shock, plug the system and peripheral power cables into properly grounded
electrical outlets. These cables are equipped with three-prong plugs to help ensure proper grounding. Do
not use adapter plugs or remove the grounding prong from a cable. If using an extension cable is
necessary, use a 3-wire cable with properly grounded plugs.
•Observe extension cable and power strip ratings. Make sure that the total ampere rating of all products
plugged into the extension cable or power strip does not exceed 80 percent of the ampere ratings limit for
the extension cable or power strip.
•To help protect the system from sudden, transient increases and decreases in electrical power, use a
surge suppressor, line conditioner, or uninterruptible power supply (UPS).
•Position system cables and power cables carefully; route cables so that they cannot be stepped on or
tripped over. Be sure that nothing rests on any cables.
•Do not modify power cables or plugs. Consult a licensed electrician or your power company for site
modifications. Always follow your local/national wiring rules.
•When connecting or disconnecting power to hot-pluggable power supplies, if offered with your system,
observe the following guidelines:

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oInstall the power supply before connecting the power cable to the power supply.
oUnplug the power cable before removing the power supply.
oIf the system has multiple sources of power, disconnect power from the system by unplugging all
power cables from the power supplies.
•Move products with care; ensure that all casters and/or stabilizers are firmly connected to the system.
Avoid sudden stops and uneven surfaces.
General Precautions for Rack-Mountable Products
Observe the following precautions for rack stability and safety. Also, refer to the rack installation documentation
accompanying the system and the rack for specific caution statements and procedures.
•Systems are considered to be components in a rack. Thus, "component" refers to any system as well as to
various peripherals or supporting hardware.
CAUTION: Installing systems in a rack without the front and side stabilizers installed could cause the
rack to tip over, potentially resulting in bodily injury under certain circumstances. Therefore, always
install the stabilizers before installing components in the rack. After installing system/components in a
rack, never pull more than one component out of the rack on its slide assemblies at one time. The
weight of more than one extended component could cause the rack to tip over and may result in serious
injury.
•Before working on the rack, make sure that the stabilizers are secured to the rack, extended to the floor,
and that the full weight of the rack rests on the floor. Install front and side stabilizers on a single rack or
front stabilizers for joined multiple racks before working on the rack.
•Always load the rack from the bottom up, and load the heaviest item in the rack first.
•Make sure that the rack is level and stable before extending a component from the rack.
•Use caution when pressing the component rail release latches and sliding a component into or out of a
rack; the slide rails can pinch your fingers.
•After a component is inserted into the rack, carefully extend the rail into a locking position, and then slide
the component into the rack.
•Do not overload the AC supply branch circuit that provides power to the rack. The total rack load should not
exceed 80 percent of the branch circuit rating.
•Ensure that proper airflow is provided to components in the rack.
•Do not step on or stand on any component when servicing other components in a rack.
NOTE: A qualified electrician must perform all connections to DC power and to safety grounds. All
electrical wiring must comply with applicable local or national codes and practices.
CAUTION: Never defeat the ground conductor or operate the equipment in the absence of a suitably
installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if
uncertain that suitable grounding is available.
CAUTION: The system chassis must be positively grounded to the rack cabinet frame. Do not attempt
to connect power to the system until grounding cables are connected. Completed power and safety
ground wiring must be inspected by a qualified electrical inspector. An energy hazard will exist if the
safety ground cable is omitted or disconnected.

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Protecting Against Electrostatic Discharge
Static electricity can harm delicate components inside the system. To prevent static damage, discharge static
electricity from your body before touching any of the electronic components, such as the microprocessor. This can
be done by periodically touching an unpainted metal surface on the chassis.
The following steps can also be taken prevent damage from electrostatic discharge (ESD):
1. When unpacking a static-sensitive component from its shipping carton, do not remove the component from
the antistatic packing material until ready to install the component in the system. Just before unwrapping
the antistatic packaging, be sure to discharge static electricity from your body.
2. When transporting a sensitive component, first place it in an antistatic container or packaging.
3. Handle all sensitive components in a static-safe area. If possible, use antistatic floor pads, workbench pads
and an antistatic grounding strap.

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Chapter 1 Web-based Switch Configuration
Introduction
Login to the Web Manager
Web-based User Interface
Web Pages
Introduction
All software functions of the DGS-3420 Series switches can be managed, configured and monitored via the
embedded web-based (HTML) interface. Manage the Switch from remote stations anywhere on the network
through a standard browser. The browser acts as a universal access tool and can communicate directly with the
Switch using the HTTP protocol.
The Web-based management module and the Console program (and Telnet) are different ways to access the
same internal switching software and configure it. Thus, all settings encountered in web-based management are
the same as those found in the console program.
Login to the Web Manager
To begin managing the Switch, simply run the browser installed on your computer and point it to the IP address you
have defined for the device. The URL in the address bar should read something like: http://123.123.123.123, where
the numbers 123 represent the IP address of the Switch.
NOTE: The factory default IP address is 10.90.90.90.
This opens the management module's user authentication window, as seen below.
Figure 1-1 Enter Network Password window
Leave both the User Name field and the Password field blank and click OK. This will open the Web-based user
interface. The Switch management features available in the web-based manager are explained below.

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Web-based User Interface
The user interface provides access to various Switch configuration and management windows, allows you to view
performance statistics, and permits you to graphically monitor the system status.
Areas of the User Interface
The figure below shows the user interface. Three distinct areas divide the user interface, as described in the table.
Figure 1-2 Main Web-Manager page
Area
Number Function
Area 1 Select the menu or window to display. Open folders and click the hyperlinked menu buttons
and subfolders contained within them to display menus. Click the D-Link logo to go to the D-
Link website.
Area 2
Presents a graphical near real-time image of the front panel of the Switch. This area displays
the Switch's ports, console and management port, showing port activity.
Some management functions, including save, reboot, download and upload are accessible
here.
Area 3 Presents switch information based on user selection and the entry of configuration data.
AREA 2
AREA 1
AREA 3

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NOTE: Any changes made to the Switch configuration during the current session must be saved in the
Save Configuration / Log window or use the command line interface (CLI) command save.
Web Pages
When connecting to the management mode of the Switch with a web browser, a login screen is displayed. Enter a
user name and password to access the Switch's management mode.
Below is a list of the main folders available in the Web interface:
System Configuration - In this section the user will be able to configure features regarding the Switch’s
configuration.
Management - In this section the user will be able to configure features regarding the Switch’s management.
L2 Features - In this section the user will be able to configure features regarding the Layer 2 functionality of the
Switch.
L3 Features- In this section the user will be able to configure features regarding the Layer 3 functionality of the
Switch.
QoS - In this section the user will be able to configure features regarding the Quality of Service functionality of the
Switch.
ACL - In this section the user will be able to configure features regarding the Access Control List functionality of the
Switch.
Security - In this section the user will be able to configure features regarding the Switch’s security.
Network Application - In this section the user will be able to configure features regarding network applications
handled by the Switch.
OAM - In this section the user will be able to configure features regarding the Switch’s operations, administration
and maintenance (OAM).
Monitoring - In this section the user will be able to monitor the Switch’s configuration and statistics.
NOTE: Be sure to configure the user name and password in the User Accounts menu before
connecting the Switch to the greater network.

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Chapter 2 System Configuration
Device Information
System Information Settings
Port Configuration
PoE
Serial Port Settings
Warning Temperature Settings
System Log configuration
Time Range Settings
Port Group Settings
Time Settings
User Accounts Settings
Command Logging Settings
Stacking
Device Information
This window contains the main settings for all the major functions for the Switch. It appears automatically when you
log on to the Switch. To return to the Device Information window after viewing other windows, click the DGS-3420-
28SC link.
The Device Information window shows the Switch’s MAC Address (assigned by the factory and unchangeable), the
Boot PROM Version, Firmware Version, Hardware Version, and many other important types of information. This is
helpful to keep track of PROM and firmware updates and to obtain the Switch’s MAC address for entry into another
network device’s address table, if necessary. In addition, this window displays the status of functions on the Switch
to quickly assess their current global status.
Many functions are hyper-linked for easy access to enable quick configuration from this window.

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Figure 2-1 Device Information window
Click the Settings
link to navigate to the appropriate feature page for configuration.
System Information Settings
The user can enter a System Name, System Location, and System Contact to aid in defining the Switch.
To view the following window, click System Configuration > System Information Settings, as show below:
Figure 2-2 System Information Settings window
The fields that can be configured are described below:
Parameter Description
System Name Enter a system name for the Switch, if so desired. This name will identify it in the
Switch network.
System Location
Enter the location of the Switch, if so desired.

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System Contact
Enter a contact name for the Switch, if so desired.
Click the Apply button to implement changes made.
Port Configuration
Port Settings
This page used to configure the details of the switch ports.
To view the following window, click System Configuration > Port Configuration > Port Settings, as show below:
Figure 2-3 Port Settings window
To configure switch ports:
1. Choose the port or sequential range of ports using the From Port and To Port drop-down menus.
2. Use the remaining drop-down menus to configure the parameters described below:
The fields that can be configured are described below:
Parameter Description
Unit
Select the unit you wish to configure.
From Port / To Port
Select the appropriate port range used for the configuration here.
State
Toggle the State field to either enable or disable a given port or group of ports.