D-Link DGS-3312SR User manual

D-Link™ DGS-3312SR
12-Port Gigabit Layer 3 Stackable Switch
Release 3.5
Manual
Third Edition
(October 2005)
Version 0.35
Printed In China
RECYCLABLE

DGS-3312SR Gigabit Layer 3 Switch
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__________________________________________________________________________________
Information in this document is subject to change without notice.
© 2005 D-Link Computer Corporation. All rights reserved.
Reproduction in any manner whatsoever without the written permission of D-Link Computer Corporation is strictly forbidden.
Trademarks used in this text: D-Link and the D-LINK logo are trademarks of D-Link Computer 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
Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own.
October 2005 P/N DGS3312SR.A3

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Table of Contents
About This Manual .............................................................................................................................................................. viii
Intended Readers ............................................................................................................................................................. viii
Typographical Conventions........................................................................................................................................ viii
Notes, Notices, and Cautions..............................................................................................................................................ix
Safety Instructions..............................................................................................................................................................ix
Safety Cautions...................................................................................................................................................................ix
General Precautions for Rack-Mountable Products.............................................................................................................x
Protecting Against Electrostatic Discharge ...................................................................................................................... xii
Introduction..............................................................................................................................................................................1
Switch Description ..............................................................................................................................................................1
Features ...............................................................................................................................................................................1
Front-Panel Components.....................................................................................................................................................3
LED Indicators ...............................................................................................................................................................3
Rear Panel Description........................................................................................................................................................5
RPS Connector ...............................................................................................................................................................5
Plug-in Modules ..................................................................................................................................................................5
Switch Stacking...................................................................................................................................................................7
Management Options ..........................................................................................................................................................8
Installation................................................................................................................................................................................9
Package Contents ................................................................................................................................................................9
Before You Connect to the Network ...................................................................................................................................9
Installing the Switch without the Rack.........................................................................................................................10
Installing the Switch in a Rack .....................................................................................................................................10
Mounting the Switch in a Standard 19" Rack...............................................................................................................11
Connecting Stacked Switch Groups .............................................................................................................................12
Configuring a Switch Group for Stacking ....................................................................................................................13
External Redundant Power System...............................................................................................................................15
Connecting the Console Port ........................................................................................................................................16
Password Protection .....................................................................................................................................................16
SNMP Settings .............................................................................................................................................................18
IP Address Assignment.................................................................................................................................................19
Connecting Devices to the Switch................................................................................................................................20
Basic Switch Management.....................................................................................................................................................21
Before You Start................................................................................................................................................................21
General Deployment Strategy.......................................................................................................................................21

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VLAN Setup.................................................................................................................................................................22
Defining Static Routes..................................................................................................................................................22
Web-based User Interface .................................................................................................................................................23
Areas of the User Interface...........................................................................................................................................23
Login to Web Manager.................................................................................................................................................24
Web Pages and Folders.................................................................................................................................................24
Basic Setup........................................................................................................................................................................25
Switch Information.......................................................................................................................................................25
Switch IP Settings.........................................................................................................................................................25
Security IP Management Stations Configuration..........................................................................................................28
User Account Management ..........................................................................................................................................28
Admin and User Privileges...........................................................................................................................................29
Save Changes................................................................................................................................................................30
Factory Reset................................................................................................................................................................30
Restart System..............................................................................................................................................................31
Advanced Settings ........................................................................................................................................................32
Switch Stack Management ................................................................................................................................................34
Configure Stacking.......................................................................................................................................................34
Basic Configuration ...............................................................................................................................................................37
Switch Information............................................................................................................................................................38
IP Address .........................................................................................................................................................................38
Advanced Settings.............................................................................................................................................................41
Port Configuration.............................................................................................................................................................43
Port Description.................................................................................................................................................................45
Port Mirroring ...................................................................................................................................................................46
Traffic Control...................................................................................................................................................................46
Link Aggregation ..............................................................................................................................................................48
LACP Port Settings ......................................................................................................................................................50
Port Access Entity (802.1X)..............................................................................................................................................51
Authentication Server...................................................................................................................................................52
Authenticator ................................................................................................................................................................52
Client ............................................................................................................................................................................53
Authentication Process .................................................................................................................................................53
802.1X Authenticator Settings......................................................................................................................................56
PAE System Control.....................................................................................................................................................58
Initializing Ports for MAC Based 802.1x .....................................................................................................................60
Reauthenticate Port(s) for Port Based 802.1x...............................................................................................................61
Reauthenticate Port(s) for MAC-based 802.1x.............................................................................................................62
RADIUS Server............................................................................................................................................................63

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IGMP Snooping.................................................................................................................................................................64
IGMP Snooping Configuration.....................................................................................................................................64
Static Router Ports........................................................................................................................................................66
Spanning Tree ...................................................................................................................................................................67
STP Bridge Global Settings..........................................................................................................................................69
MST Configuration Table.............................................................................................................................................71
MSTI Settings...............................................................................................................................................................74
STP Instance Settings ...................................................................................................................................................75
STP Port Settings..........................................................................................................................................................77
Forwarding & Filtering .....................................................................................................................................................79
Unicast Forwarding ......................................................................................................................................................79
Multicast Forwarding ...................................................................................................................................................80
VLANs ..............................................................................................................................................................................81
802.1Q Static VLANs...................................................................................................................................................85
GVRP Settings..............................................................................................................................................................88
QoS....................................................................................................................................................................................89
Understanding QoS.......................................................................................................................................................90
802.1p Default Priority.................................................................................................................................................91
802.1p User Priority .....................................................................................................................................................91
QoS Output Scheduling Configuration.........................................................................................................................92
Traffic Segmentation ....................................................................................................................................................93
Port Bandwidth.............................................................................................................................................................94
MAC Notification..............................................................................................................................................................95
MAC Notification Global Settings ...............................................................................................................................95
MAC Notification Port Settings ...................................................................................................................................95
Port Security Configuration...............................................................................................................................................96
Port Security .................................................................................................................................................................96
Port Lock Entry Delete.................................................................................................................................................97
Port Security Clear........................................................................................................................................................97
System Log Server ............................................................................................................................................................98
SNTP Settings .................................................................................................................................................................100
Time Setting ...............................................................................................................................................................100
Time Zone and DST Settings .....................................................................................................................................101
Access Profile Table........................................................................................................................................................103
Layer 3 IP Networking.........................................................................................................................................................112
L3 Global Advanced Settings..........................................................................................................................................112
IP Interface Settings ........................................................................................................................................................113
MD5 Key Settings...........................................................................................................................................................116
Route Redistribution Settings..........................................................................................................................................117

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Static/Default Route Settings ..........................................................................................................................................119
Static ARP Settings .........................................................................................................................................................120
RIP...................................................................................................................................................................................121
RIP Global Setting......................................................................................................................................................123
RIP Interface Settings.................................................................................................................................................123
OSPF ...............................................................................................................................................................................125
Introduction to OSPF..................................................................................................................................................125
OSPF General Setting.................................................................................................................................................142
OSPF Area ID Settings...............................................................................................................................................142
OSPF Interface Settings..............................................................................................................................................144
OSPF Virtual Interface Settings .................................................................................................................................146
OSPF Area Aggregation Settings ...............................................................................................................................148
OSPF Host Route Settings..........................................................................................................................................149
DHCP/BOOTP Relay......................................................................................................................................................150
DHCP/BOOTP Relay Information .............................................................................................................................150
DHCP/BOOTP Relay Settings ...................................................................................................................................151
DNS Relay.......................................................................................................................................................................152
DNS Relay Information..............................................................................................................................................152
DNS Relay Static Settings..........................................................................................................................................153
VRRP ..............................................................................................................................................................................154
VRRP Configuration ..................................................................................................................................................154
VRRP Interface Settings.............................................................................................................................................155
IP Multicast .....................................................................................................................................................................159
IGMP..........................................................................................................................................................................159
IGMP Versions 1 and 2 ..............................................................................................................................................159
IGMP Interface Settings .............................................................................................................................................160
DVMRP......................................................................................................................................................................162
PIM.............................................................................................................................................................................164
Security ................................................................................................................................................................................166
Trusted Host ....................................................................................................................................................................166
Secure Socket Layer (SSL) .............................................................................................................................................167
Download Certificate..................................................................................................................................................167
Configuration..............................................................................................................................................................168
Secure Shell (SSH)..........................................................................................................................................................170
SSH Configuration .....................................................................................................................................................170
SSH Algorithm ...........................................................................................................................................................172
SSH User Authentication............................................................................................................................................174
Access Authentication Control........................................................................................................................................175
Policy & Parameters ...................................................................................................................................................176

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Application Authentication Settings...........................................................................................................................177
Authentication Server Group......................................................................................................................................178
Authentication Server Host.........................................................................................................................................180
Login Method Lists ....................................................................................................................................................182
Enable Method Lists...................................................................................................................................................184
Local Enable Password...............................................................................................................................................186
Enable Admin.............................................................................................................................................................187
Management.........................................................................................................................................................................188
User Accounts .................................................................................................................................................................188
SNMP..............................................................................................................................................................................190
SNMP Settings ...........................................................................................................................................................190
SNMP User Table.......................................................................................................................................................191
SNMP View Table......................................................................................................................................................193
SNMP Group Table....................................................................................................................................................194
SNMP Community Table ...........................................................................................................................................196
SNMP Host Table.......................................................................................................................................................197
SNMP Engine ID........................................................................................................................................................198
Monitoring ...........................................................................................................................................................................199
Stack Information............................................................................................................................................................200
Port Utilization ................................................................................................................................................................203
CPU Utilization ...............................................................................................................................................................204
Packets.............................................................................................................................................................................205
Received Packets ........................................................................................................................................................205
Received Unicast/Multicast/Broadcast Packets..........................................................................................................207
Transmitted Packets....................................................................................................................................................209
Errors...............................................................................................................................................................................211
Received Errors ..........................................................................................................................................................211
Transmitted Errors......................................................................................................................................................213
Size..................................................................................................................................................................................215
Packet Size..................................................................................................................................................................215
MAC Address..................................................................................................................................................................217
Switch History Log .........................................................................................................................................................219
IGMP Snooping Table.....................................................................................................................................................220
IGMP Snooping Forwarding ...........................................................................................................................................221
VLAN Status...................................................................................................................................................................222
Router Port ......................................................................................................................................................................223
Session Table...................................................................................................................................................................224
Layer 3 Feature................................................................................................................................................................225

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Traceroute...................................................................................................................................................................225
Browse IP Address Table ...........................................................................................................................................226
Browse Routing Table................................................................................................................................................227
Browse ARP Table .....................................................................................................................................................227
Browse IP Multicast Forwarding Table......................................................................................................................228
Browse IGMP Group Table........................................................................................................................................228
OSPF Monitor.............................................................................................................................................................229
DVMRP Monitor........................................................................................................................................................232
PIM Monitor...............................................................................................................................................................233
Maintenance.........................................................................................................................................................................234
TFTP Services.................................................................................................................................................................234
Download Firmware...................................................................................................................................................234
Download Configuration File.....................................................................................................................................235
Upload Configuration.................................................................................................................................................235
Upload Log.................................................................................................................................................................235
Ping Test..........................................................................................................................................................................236
Save Changes ..................................................................................................................................................................236
Factory Reset...................................................................................................................................................................237
Restart System.................................................................................................................................................................238
Logout .............................................................................................................................................................................238
Single IP Management .........................................................................................................................................................239
SIM Settings....................................................................................................................................................................241
Topology .........................................................................................................................................................................242
Tool Tips ....................................................................................................................................................................244
Right-click ..................................................................................................................................................................245
Member Switch Icon ..................................................................................................................................................247
Candidate Switch Icon................................................................................................................................................248
Menu Bar....................................................................................................................................................................249
Group..........................................................................................................................................................................249
Device.........................................................................................................................................................................249
View ...........................................................................................................................................................................249
Firmware Upgrade...........................................................................................................................................................250
Configuration File Backup/Restore.................................................................................................................................250
Technical Specifications ......................................................................................................................................................251
Cables and Connectors ...............................................................................................................................................253
Cable Lengths.............................................................................................................................................................254

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About This Manual
This manual is divided into ten general sections:
Section 1, Introduction - Describes the Switch’s hardware and its features.
Section 2, Installation- Helps you get started with the basic installation of the Switch and also describes the front panel,
rear panel, side panels, and LED indicators of the Switch.
Section 3, Basic Management - Tells how you can connect the Switch to your Ethernet network.
Section 4, Basic Configuration - A detailed discussion about configuring some of the basic functions of the Switch,
including accessing the Switch information, using the Switch's utilities and setting up network configurations, such as
Quality of Service, The Access Profile Table, port mirroring and configuring the Spanning Tree.
Section 5, Layer 3 IP Networking - Talks about configuration of the Layer 3 networking functions of the Switch
including RIP, OSPF, VRRP, DVMRP and PIM.
Section 6, Management - A discussion of the security features of the Switch, including Security IP, User Accounts,
Access Authentication Control, SSH and SSL.
Section 7, Management – A detailed discussion regarding User Accounts and the Simple Network Monitoring Protocol
including description of features and a brief introduction to SNMP.
Section 8, Monitoring - Features graphs and screens used in monitoring features and packets on the Switch.
Section 9, Maintenance - Features information on Switch utility functions, including TFTP Services, Switch History, Ping
Test Save Changes and Rebooting Services.
Section 10, Single IP Management - Discussion on the Single IP Management function of the Switch, including functions
and features of the Java based user interface and the utilities of the SIM function.
Intended Readers
The DGS-3312SR Manual contains information useful for setup and management and of the DGS-3312SR 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 your 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.
Italics Indicates a window name or a field. Also can indicate a variables or parameter that is
replaced with an appropriate word or string. For example: type filename means that
you should type the actual filename instead of the word shown in italic.
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.

DGS-3312SR Stackable Gigabit Layer 3 Switch
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Notes, Notices, and Cautions
A NOTE indicates important information that helps you make better use of
your device.
A NOTICE indicates either potential damage to hardware or loss of data
and tells you 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 you need
to review and follow.
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.
• Do not service any product except as explained in your system documentation.
• Opening or removing covers that are marked with the triangular symbol with a lightning bolt may expose you to
electrical shock.
• Only 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:
• The power cable, extension cable, or plug is damaged.
• An object has fallen into the product.
• The product has been exposed to water.
• The product has been dropped or damaged.
• The product does not operate correctly when you follow the operating instructions.
• Keep your system away from radiators and heat sources. Also, do not block cooling vents.
• Do not spill food or liquids on your system components, and never operate the product in a wet environment. If the
system gets wet, see the appropriate section in your troubleshooting guide or contact your trained service provider.

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• Do not push any objects into the openings of your 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 you are
not sure of the type of power source required, consult your service provider or local power company.
• To help avoid damaging your system, be sure the voltage selection switch (if provided) on the power supply is set to
match the power available at your location:
• 115 volts (V)/60 hertz (Hz) in most of North and South America and some Far Eastern countries such as South
Korea and Taiwan
• 100 V/50 Hz in eastern Japan and 100 V/60 Hz in western Japan
• 230 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 you must use an extension cable, 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 your 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:
• Install the power supply before connecting the power cable to the power supply.
• Unplug the power cable before removing the power supply.
• If 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.

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• 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 you are
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.

DGS-3312SR Stackable Gigabit Layer 3 Switch
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Protecting Against Electrostatic Discharge
Static electricity can harm delicate components inside your system. To prevent static damage, discharge static electricity
from your body before you touch any of the electronic components, such as the microprocessor. You can do so by
periodically touching an unpainted metal surface on the chassis.
You can also take the following steps to 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 you are ready to install the component in your 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.

DGS-3312SR Stackable Gigabit Layer 3 Switch
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Section 1
Introduction
Switch Description
Features
Front Panel Components
LED Indicators
Stacking LED Indicators
Rear Panel Description
Plug-in Modules
Switch Stacking
Management Options
Switch Description
The DGS-3312SR is a modular Gigabit Ethernet backbone Switch designed for adaptability and scalability. The Switch
provides a management platform and uplink to backbone for a stacked group of up to twelve DES-3226S or DES-3250TG
switches in a star topology arrangement. Alternatively, the Switch can utilize up to twelve Gigabit Ethernet ports to
function as a central distribution hub for other Switches or Switch groups, or routers. The four built-in combination Gigabit
ports have the option of being used as either 1000BASE-T or SFP Gigabit connections.
Features
• Four built-in combination 10/100/1000BASE-T/SFP ports
• Two additional 4-port modules can be added to stack up to eight additional Switches (IEEE 1394) or up to eight
additional Gigabit Ethernet ports (1000BASE-T or SFP) or use combination of stacking and Gigabit Ethernet
ports.
• Star topology Switch stacking configuration for up to 12 additional DES-3226S/DES-3250TG Switches.
• 24 Gbps Switching fabric capacity
• Supports 802.1D STP, 802.1w Rapid Spanning Tree and 802.1s MSTP for redundant back up bridge paths
• Supports 802.1Q VLAN
• Supports IGMP snooping
• Supports 802.1p Priority Queues
• Supports 802.3ad LACP Link Aggregation
• Supports port mirroring
• Access Control Profile (ACL)
• Multi-layer Access Control (based on MAC address, IP address, VLAN, Protocol, 802.1p, DSCP)
• Quality of Service (QoS) customized control
• Port Security (MAC address table lock)
• 802.1x (port-based and MAC-based) access control and RADIUS Client support
• Administrator-definable port security

DGS-3312SR Stackable Gigabit Layer 3 Switch
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• Per-port bandwidth control
• Broadcast, Multicast and DLF storm control
• IEEE 802.3z and IEEE 802.3x compliant Flow Control for all Gigabit ports
• SNMP v.1, v.2, v.3 network management, RMON support
• Supports optional external Redundant Power Supply
• Supports Web-based management.
• Supports CLI management.
• Supports BOOTP/DHCP/DNS Relay
• Supports TFTP upgrade
• Supports System Log
• Fully configurable either in-band or out-of-band control via RS-232 console serial connection.
• Telnet remote control console
• Traffic Segmentation
• Simple Network Time Protocol
• MAC address update notification
• Web GUI Traffic Monitoring
• Supports RIP v1, v2
• Supports OSPF
• Supports PIM-DM
• Supports DVMRP
• Supports IGMP
• Supports VRRP
• Supports floating static route
• Supports SSL
• Supports SSH
• Supports Single IP Management v.1.0
• Supports RADIUS Authentication
• Supports TACACS, TACACS+, and XTACACS

DGS-3312SR Stackable Gigabit Layer 3 Switch
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Front-Panel Components
The front panel of the Switch consists of LED indicators, an RS-232 communication port, two slide-in module slots, and
four 1000BASE-T/SFP combo ports.
Figure 1- 1. Front Panel View of the Switch as shipped (no modules are installed)
Comprehensive LED indicators display the status of the Switch and the network.
An RS-232 DCE console port for setting up and managing the Switch via a connection to a console terminal or PC using a
terminal emulation program.
A front-panel slide-in module slot for Gigabit Ethernet ports can accommodate a 4-port 1000BASE-T Gigabit Ethernet
module, a 4-port Gigabit Ethernet SFP module, or a stacking module to connect to four DES-3226S/DES-3250TG
Switches.
LED Indicators
The LED indicators of the Switch include Power, Console, and Link/Act. The following shows the LED indicators for the
Switch along with an explanation of each indicator.
Figure 1- 2. LED Indicators
Power
This indicator on the front panel should be lit during the Power-On Self Test (POST). It will
light green approximately two seconds after the Switch is powered on to indicate the ready
state of the device.
Console This indicator is lit green when the Switch is being managed via out-of-band/local console
management through the RS-232 console port using a straight-through serial cable.
RPS This indicator will light steady amber when an external power supply is supplying power. This
indicates the internal power supply has failed.
Link/Act
Each on-board Gigabit Ethernet port has a corresponding indicator. This will light steady green
for a valid link and blink whenever there is reception or transmission (i.e. Activity--Act) of data
occurring at a port.
See below for description of Stack ID LED indicator.

DGS-3312SR Stackable Gigabit Layer 3 Switch
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NOTICE: The Stack ID LED on the Switch’s front panel will display an F,
regardless of the Switch’s stacking mode (Master Switch in a Switch stack,
or Standalone mode).
Stacking LED Indicators
Stacking LED indicators include the Stack ID indicator on the front panel and the Link/Act indicators on the front of the
DEM-540 stacking module.
NOTICE: The four build-in combination ports on the front panel of the
DGS-3312SR can be configured as stacking ports using the CLI.
Each IEEE 1394 stacking module has a single Link/Act LED indicator on its front panel for each IEEE 1394 IN/OUT pair.
Figure 1- 3. Front panel of DEM-540 IEEE 1394 stacking module
Link/Act
The Link/Act LEDs have the same function as the corresponding LEDs for the
Switch’s built-in Gigabit Ethernet ports. The Link LED lights to confirm a valid link,
while the Act LED blinks to indicate activity on the link.
Stack ID
The Switch includes a digital indicator to indicate the Switch status in a stacked
Switch group. An “F” indicates the Switch is acting in the capacity of a master Switch
of a stacked group of DGS-3312SR/DES-3226S/DES-3250TG Switches. The
remaining slave Switches in the group will display a corresponding stack number (1-
C) to indicate the logical position of the slave Switch in the stacked group. See the
discussion of Switch Stacking below for more information on stacking DGS-
3312SR/DES-3226S/DES-3250TG Switches.
NOTICE: Do not connect the stacked Switch group to the network until you have
properly configured all Switches for stacking. An improperly configured Switch
stack can cause a broadcast storm.

DGS-3312SR Stackable Gigabit Layer 3 Switch
5
Rear Panel Description
The rear panel of the Switch contains an AC power connector.
Figure 1- 4. Rear panel view of the Switch
The AC power connector is a standard three-pronged connector that supports the power cord. Plug-in the female connector
of the provided power cord into this socket, and the male side of the cord into a power outlet. The Switch automatically
adjusts its power setting to any supply voltage in the range from 100 ~ 240 VAC at 50 ~ 60 Hz.
RPS Connector
Connect the optional external redundant power supply to the RPS connector. If the Switch’s internal power unit fails, the
redundant power system automatically supplies power to the Switch for uninterrupted operation.
The Switch supports the D-Link RPS-200 or RPS-500 redundant power supply units.
Plug-in Modules
The DGS-3312SR Switch is able to accommodate optional plug-in modules in order to increase functionality and
performance. Two modules may be installed and used in combination with any of the three available modules. Plug-in
modules must be purchased separately.
DEM-340T 1000BASE-T Module
Figure 1- 5. 1000BASE-T Four-port module
• Front-panel module
• Connects to 1000BASE-T devices
• May be used as stacking ports for DES-3250TG slave switches.
• LED indicators for Link/Activity

DGS-3312SR Stackable Gigabit Layer 3 Switch
6
DEM-340MG SFP (Mini GBIC) Module
Figure 1- 6. Four-port Gigabit SFP module
• Front-panel module
• Connects to Gigabit Ethernet devices
• May be used as stacking ports for DES-3250TG slave switches.
• LED indicators for Link/Activity and Status
DEM-540 IEEE 1394 Stacking Module
Figure 1- 7. DEM-540 IEEE 1394 Stacking module
• Front-panel module
• Connect to four DES-3226S Switches (up to eight additional slave units may be stacked)
• Four transmitting ports and Four receiving port
• Use the connector of IEEE 1394b
• Data rate up to 1000 Mbps
• 8-segment LED display to indicate Switch ID number within the Switch stack

DGS-3312SR Stackable Gigabit Layer 3 Switch
7
Switch Stacking
The DGS-3312SR can be stacked with a DES-3226S or DES-3250TG, functioning as the Master of the stack. There are
three connection options available to for stacking.
1. Utilizing a gigabit Ethernet port with either the built-in combination mini-GBIC ports or using the DEM-340T
1000BASE-T stacking module.
2. Using a fiber-optic transceiver cabling with either the built-in combination mini-GBIC ports or using the DEM-
340MG SFP (Mini GBIC) stacking module.
3. Using IEEE 1394 fire wire cabling with the DEM-540 IEEE 1394 Stacking Module.
Each optional stacking module allows up to four DES-3226S or DES-3250TG Switches to be interconnected in a stack
with the DGS-3312SR for up to twelve gigabit ports that may be used to stack up to 12 slave units to provide up to 576
10/100 Mbps ports and 12 Gigabit ports in a star architecture. For stacking, the DGS-3312SR will be the master switch of a
stack of DES-3226S switches, DES-3250TG switches or a combination of both. The entire Switch stack is managed and
monitored through the network or alternatively, through the serial port on the DGS-3312SR.
The IEEE 1394 fire wire stacking ports are marked IN and OUT. The IEEE 1394 compliant cable must be connected from
an IN port on one Switch to an OUT port on the next Switch in the stack.
Restrictions and Cautions for Stacking
The DGS-3312SR may serve as the Master of up to twelve additional Switches. The slave switch units must meet the
following criteria:
• All additional slave Switches must be DES-3226S or DES-3250TG Switches. The slave unit types can be mixed
within a single stacked group.
• DES-3226S or DES-3250TG slave Switches must have firmware Release IV or later loaded to operate properly
with the DGS-3312SR Master.
• The DGS-3312SR is automatically started as the Master Switch in a Switch stack.
• It is necessary to enable stacking for each slave Switch in a stacked group before interconnecting them and before
connecting the group to the network. Stacking can be enabled by connecting to each slave through the console
port and using the CLI stacking configuration command. Before stacking has been enabled on the slaves, the
IEEE 1394 port is treated logically as an individual 1000BASE port in full-duplex mode. Since the Spanning Tree
Protocol is disabled by default, a broadcast storm will result if the stacking link is completed between Switches
that have not been properly configured.
NOTICE: The CLI stacking command set for the DGS-3312SR is slightly different
from the CLI stacking command set for the DES-3226S or DES-3250TG. Please
refer to the CLI Reference Manual for each Switch for details or read the
instructions starting with the next section.