D-Link DGS-3208TG - Switch User manual

DGS-3208TG
Gigabit Ethernet Switch
User’s Guide
First Edition (July 2000)
6DGS3208TG01
Printed In Taiwan
RECYCLABLE

Wichtige Sicherheitshinweise
1. Bitte lesen Sie sich diese Hinweise sorgfältig durch.
2. Heben Sie diese Anleitung für den spätern Gebrauch auf.
3. Vor jedem Reinigen ist das Gerät vom Stromnetz zu trennen. Vervenden Sie keine Flüssig- oder Aerosolreiniger. Am besten dient ein angefeuchtetes
Tuch zur Reinigung.
4. Um eine Beschädigung des Gerätes zu vermeiden sollten Sie nur Zubehörteile verwenden, die vom Hersteller zugelassen sind.
5. Das Gerät is vor Feuchtigkeit zu schützen.
6. Bei der Aufstellung des Gerätes ist auf sichern Stand zu achten. Ein Kippen oder Fallen könnte Verletzungen hervorrufen. Verwenden Sie nur sichere
Standorte und beachten Sie die Aufstellhinweise des Herstellers.
7. Die Belüftungsöffnungen dienen zur Luftzirkulation die das Gerät vor Überhitzung schützt. Sorgen Sie dafür, daß diese Öffnungen nicht abgedeckt
werden.
8. Beachten Sie beim Anschluß an das Stromnetz die Anschlußwerte.
9. Die Netzanschlußsteckdose muß aus Gründen der elektrischen Sicherheit einen Schutzleiterkontakt haben.
10. Verlegen Sie die Netzanschlußleitung so, daß niemand darüber fallen kann. Es sollete auch nichts auf der Leitung abgestellt werden.
11. Alle Hinweise und Warnungen die sich am Geräten befinden sind zu beachten.
12. Wird das Gerät über einen längeren Zeitraum nicht benutzt, sollten Sie es vom Stromnetz trennen. Somit wird im Falle einer Überspannung eine
Beschädigung vermieden.
13. Durch die Lüftungsöffnungen dürfen niemals Gegenstände oder Flüssigkeiten in das Gerät gelangen. Dies könnte einen Brand bzw. Elektrischen Schlag
auslösen.
14. Öffnen Sie niemals das Gerät. Das Gerät darf aus Gründen der elektrischen Sicherheit nur von authorisiertem Servicepersonal geöffnet werden.
15. Wenn folgende Situationen auftreten ist das Gerät vom Stromnetz zu trennen und von einer qualifizierten Servicestelle zu überprüfen:
a – Netzkabel oder Netzstecker sint beschädigt.
b – Flüssigkeit ist in das Gerät eingedrungen.
c – Das Gerät war Feuchtigkeit ausgesetzt.
d – Wenn das Gerät nicht der Bedienungsanleitung ensprechend funktioniert oder Sie mit Hilfe dieser Anleitung keine Verbesserung erzielen.
e – Das Gerät ist gefallen und/oder das Gehäuse ist beschädigt.
f – Wenn das Gerät deutliche Anzeichen eines Defektes aufweist.
16. Bei Reparaturen dürfen nur Orginalersatzteile bzw. den Orginalteilen entsprechende Teile verwendet werden. Der Einsatz von ungeeigneten
Ersatzteilen kann eine weitere Beschädigung hervorrufen.
17. Wenden Sie sich mit allen Fragen die Service und Repartur betreffen an Ihren Servicepartner. Somit stellen Sie die Betriebssicherheit des Gerätes
sicher.
1. Zum Netzanschluß dieses Gerätes ist eine geprüfte Leitung zu verwenden, Für einen Nennstrom bis 6A und einem Gerätegewicht grőßer 3kg ist eine
Leitung nicht leichter als H05VV-F, 3G, 0.75mm2 einzusetzen.

WARRANTIES EXCLUSIVE
IF THE D-LINK PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, THE CUSTOMER'S SOLE REMEDY SHALL BE, AT D-LINK'S OPTION,
REPAIR OR REPLACEMENT. THE FOREGOING WARRANTIES AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER
WARRANTIES, EXPRESSED OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE, INCLUDING
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. D-LINK NEITHER ASSUMES NOR AUTHORIZES ANY
OTHER PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE, INSTALLATION MAINTENANCE OR USE OF D-
LINK'S PRODUCTS
D-LINK SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE THAT THE ALLEGED DEFECT IN
THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY THE CUSTOMER'S OR ANY THIRD PERSON'S MISUSE, NEGLECT, IMPROPER
INSTALLATION OR TESTING, UNAUTHORIZED ATTEMPTS TO REPAIR, OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE,
OR BY ACCIDENT, FIRE, LIGHTNING OR OTHER HAZARD.
LIMITATION OF LIABILITY
IN NO EVENT WILL D-LINK BE LIABLE FOR ANY DAMAGES, INCLUDING LOSS OF DATA, LOSS OF PROFITS, COST OF COVER OR OTHER
INCIDENTAL, CONSEQUENTIAL OR INDIRECT DAMAGES ARISING OUT THE INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE
OR INTERRUPTION OF A D- LINK PRODUCT, HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY. THIS LIMITATION WILL APPLY EVEN
IF D-LINK HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
IF YOU PURCHASED A D-LINK PRODUCT IN THE UNITED STATES, SOME STATES DO NOT ALLOW THE LIMITATION OR EXCLUSION OF
LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.

Limited Warranty
Hardware:
D-Link warrants each of its hardware products to be free from defects in workmanship and materials under normal use and service for a period commencing
on the date of purchase from D-Link or its Authorized Reseller and extending for the length of time stipulated by the Authorized Reseller or D-Link Branch
Office nearest to the place of purchase.
This Warranty applies on the condition that the product Registration Card is filled out and returned to a D-Link office within ninety (90) days of purchase. A
list of D-Link offices is provided at the back of this manual, together with a copy of the Registration Card.
If the product proves defective within the applicable warranty period, D-Link will provide repair or replacement of the product. D-Link shall have the sole
discretion whether to repair or replace, and replacement product may be new or reconditioned. Replacement product shall be of equivalent or better
specifications, relative to the defective product, but need not be identical. Any product or part repaired by D-Link pursuant to this warranty shall have a
warranty period of not less than 90 days, from date of such repair, irrespective of any earlier expiration of original warranty period. When D-Link provides
replacement, then the defective product becomes the property of D-Link.
Warranty service may be obtained by contacting a D-Link office within the applicable warranty period, and requesting a Return Material Authorization (RMA)
number. If a Registration Card for the product in question has not been returned to D-Link, then a proof of purchase (such as a copy of the dated purchase
invoice) must be provided. If Purchaser's circumstances require special handling of warranty correction, then at the time of requesting RMA number,
Purchaser may also propose special procedure as may be suitable to the case.
After an RMA number is issued, the defective product must be packaged securely in the original or other suitable shipping package to ensure that it will not
be damaged in transit, and the RMA number must be prominently marked on the outside of the package. The package must be mailed or otherwise shipped to
D-Link with all costs of mailing/shipping/insurance prepaid. D-Link shall never be responsible for any software, firmware, information, or memory data of
Purchaser contained in, stored on, or integrated with any product returned to D-Link pursuant to this warranty.
Any package returned to D-Link without an RMA number will be rejected and shipped back to Purchaser at Purchaser's expense, and D-Link reserves the
right in such a case to levy a reasonable handling charge in addition mailing or shipping costs.
Software:
Warranty service for software products may be obtained by contacting a D-Link office within the applicable warranty period. A list of D-Link offices is
provided at the back of this manual, together with a copy of the Registration Card. If a Registration Card for the product in question has not been returned to
a D-Link office, then a proof of purchase (such as a copy of the dated purchase invoice) must be provided when requesting warranty service. The term
"purchase" in this software warranty refers to the purchase transaction and resulting license to use such software.
D-Link warrants that its software products will perform in substantial conformance with the applicable product documentation provided by D-Link with such
software product, for a period of ninety (90) days from the date of purchase from D-Link or its Authorized Reseller. D-Link warrants the magnetic media, on
which D-Link provides its software product, against failure during the same warranty period. This warranty applies to purchased software, and to
replacement software provided by D-Link pursuant to this warranty, but shall not apply to any update or replacement which may be provided for download via
the Internet, or to any update which may otherwise be provided free of charge.
D-Link's sole obligation under this software warranty shall be to replace any defective software product with product which substantially conforms to D-Link's
applicable product documentation. Purchaser assumes responsibility for the selection of appropriate application and system/platform software and associated
reference materials. D-Link makes no warranty that its software products will work in combination with any hardware, or any application or system/platform
software product provided by any third party, excepting only such products as are expressly represented, in D-Link's applicable product documentation as
being compatible. D-Link's obligation under this warranty shall be a reasonable effort to provide compatibility, but D-Link shall have no obligation to provide
compatibility when there is fault in the third-party hardware or software. D-Link makes no warranty that operation of its software products will be
uninterrupted or absolutely error-free, and no warranty that all defects in the software product, within or without the scope of D-Link's applicable product
documentation, will be corrected.
D-Link Offices for Registration and Warranty Service
The product's Registration Card, provided at the back of this manual, must be sent to a D-Link office. To obtain an RMA number for warranty service as to a
hardware product, or to obtain warranty service as to a software product, contact the D-Link office nearest you. An address/telephone/fax/e-mail/Web site list
of D-Link offices is provided in the back of this manual.
Trademarks
Copyright 2000 D-Link Corporation.
Contents subject to change without prior notice.
D-Link is a registered trademark of D-Link Corporation/D-Link Systems, Inc. All other trademarks belong to
their respective proprietors.
Copyright Statement
No part of this publication may be reproduced in any form or by any means or used to make any derivative such as translation,
transformation, or adaptation without permission from D-Link Corporation/D-Link Systems Inc., as stipulated by the United
States Copyright Act of 1976.

FCC Warning
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in accordance with this user’s guide,
may cause harmful interference to radio communications. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user will be required to correct the interference at his
own expense.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1)
This device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
CE Mark Warning:
This is a Class A product. In a domestic environment this product may cause radio interference in which case
the user may be required to take adequate measures.
Warnung!
Dies ist ein Produkt der Klasse A. Im Wohnbereich kann dieses Produkt Funkstoerungen verursachen. In
diesem Fall kann vom Benutzer verlangt werden, angemessene Massnahmen zu ergreifen.
Precaución!
Este es un producto de Clase A. En un entorno doméstico, puede causar interferencias de radio, en cuyo case,
puede requerirse al usuario para que adopte las medidas adecuadas.
Attention!
Ceci est un produit de classe A. Dans un environnement domestique, ce produit pourrait causer des
interférences radio, auquel cas l`utilisateur devrait prendre les mesures adéquates.
Attenzione!
Il presente prodotto appartiene alla classe A. Se utilizzato in ambiente domestico il prodotto può causare
interferenze radio, nel cui caso è possibile che l`utente debba assumere provvedimenti adeguati.
VCCI Warning
BSMI Warning

TABLE OF CONTENTS
0ABOUT THIS GUIDE..........................................................................................................................................................V
TERMS......................................................................................................................................................................................... V
OVERVIEW OF THIS USER’S GUIDE .............................................................................................................................................. V
1INTRODUCTION..................................................................................................................................................................1
GIGABIT ETHERNET TECHNOLOGY...............................................................................................................................................1
SWITCHING TECHNOLOGY............................................................................................................................................................1
FEATURES ....................................................................................................................................................................................2
Ports.........................................................................................................................................................................................2
Performance features...............................................................................................................................................................2
Management.............................................................................................................................................................................3
2UNPACKING AND SETUP..................................................................................................................................................4
UNPACKING..................................................................................................................................................................................4
SETUP...........................................................................................................................................................................................4
DESKTOP OR SHELF INSTALLATION ..............................................................................................................................................4
RACK INSTALLATION....................................................................................................................................................................5
POWER ON....................................................................................................................................................................................6
Power Failure ..........................................................................................................................................................................6
3IDENTIFYING EXTERNAL COMPONENTS...................................................................................................................7
FRONT PANEL...............................................................................................................................................................................7
REAR PANEL ................................................................................................................................................................................7
SIDE PANELS ................................................................................................................................................................................8
LED INDICATORS.........................................................................................................................................................................8
4CONNECTING THE SWITCH..........................................................................................................................................10
PC TO SWITCH............................................................................................................................................................................10
SWITCH TO SWITCH (OTHER DEVICES)........................................................................................................................................10
5SWITCH MANAGEMENT CONCEPTS..........................................................................................................................12
LOCAL CONSOLE MANAGEMENT................................................................................................................................................12
Console port (RS-232 DCE)...................................................................................................................................................12
IP Addresses and SNMP Community Names .........................................................................................................................12
Traps ......................................................................................................................................................................................13
MIBs.......................................................................................................................................................................................14
Packet Forwarding.................................................................................................................................................................14
Aging Time.............................................................................................................................................................................14
Spanning Tree Algorithm.......................................................................................................................................................15
STA Operation Levels.............................................................................................................................................................15
On the Bridge Level ................................................................................................................................................................................15
On the Port Level ....................................................................................................................................................................................16
User-Changeable Parameters................................................................................................................................................16
Illustration of STA..................................................................................................................................................................16
Port Trunking.........................................................................................................................................................................18
VLANs & MAC-based Broadcast Domains............................................................................................................................19
MAC-Based Broadcast Domains............................................................................................................................................19
IEEE 802.1Q VLANs..............................................................................................................................................................20
802.1Q VLAN Segmentation ..................................................................................................................................................................20
Sharing Resources Across 802.1Q VLANs.............................................................................................................................................20
802.1Q VLANs Spanning Multiple Switches..........................................................................................................................................21

VLANs Over 802.1Q-compliant Switches......................................................................................................................................22
Port-Based VLANs .................................................................................................................................................................23
BROADCAST STORMS .................................................................................................................................................................23
Segmenting Broadcast Domains ............................................................................................................................................23
Eliminating Broadcast Storms................................................................................................................................................24
6USING THE CONSOLE INTERFACE.............................................................................................................................25
SETTING UP A CONSOLE ............................................................................................................................................................25
CONNECTING TO THE SWITCH USING TELNET.............................................................................................................................26
CONSOLE USAGE CONVENTIONS ................................................................................................................................................26
FIRST TIME CONNECTING TO THE SWITCH.................................................................................................................................26
Steps to Create Administrator or Normal User Access..........................................................................................................27
Administrator and Normal User Privileges............................................................................................................................28
Save Changes.........................................................................................................................................................................28
LOGIN ON THE SWITCH CONSOLE BY REGISTERED USERS ........................................................................................................29
Add/Modify User Account......................................................................................................................................................29
View/Delete User Account......................................................................................................................................................31
SETTING UP THE SWITCH ...........................................................................................................................................................31
System Configuration.............................................................................................................................................................31
Configure IP Address..............................................................................................................................................................................32
Configure Console...................................................................................................................................................................................33
Configure Switch.....................................................................................................................................................................................34
Configure Ports........................................................................................................................................................................................35
Configure GBIC Ports.............................................................................................................................................................................37
Configure Port Mirroring ........................................................................................................................................................................38
Configure Spanning Tree Protocol..........................................................................................................................................................38
Configure Filtering and Forwarding Table..............................................................................................................................................41
Configure Static Forwarding Table.................................................................................................................................................42
Configure MAC Address Filtering...................................................................................................................................................43
Configure Static Multicast Forwarding...........................................................................................................................................44
Configure IGMP Filtering.......................................................................................................................................................................45
Configure 802.1Q IGMP...................................................................................................................................................................45
Configure Port-based IGMP............................................................................................................................................................47
Configure VLAN.....................................................................................................................................................................................48
Configure MAC-based Broadcast Domains..................................................................................................................................48
Configure Port-based VLANs..........................................................................................................................................................51
Configure 802.1Q VLAN ..................................................................................................................................................................52
Configure GMRP...............................................................................................................................................................................55
Configure Trunk.....................................................................................................................................................................56
Update Firmware and Configuration Files............................................................................................................................57
System Utilities.......................................................................................................................................................................58
Ping Test..................................................................................................................................................................................................59
Save Settings to TFTP Server..................................................................................................................................................................60
Save Switch History to TFTP Server.......................................................................................................................................................60
Clear Address Table ................................................................................................................................................................................61
SNMP Manager Configuration ..............................................................................................................................................61
SWITCH MONITORING.................................................................................................................................................................62
Network Monitoring...............................................................................................................................................................62
Traffic Statistics.......................................................................................................................................................................................62
Statistics Overview............................................................................................................................................................................63
Port Traffic Statistics.........................................................................................................................................................................64
Port Packet Error Statistics..............................................................................................................................................................64
Port Packet Analysis Statistics........................................................................................................................................................65
Browse Address Table.............................................................................................................................................................................66
Browse IGMP Status...............................................................................................................................................................................67
Browse GVRP Status ..............................................................................................................................................................................68
Browse GMRP Status..............................................................................................................................................................................69
Switch History.........................................................................................................................................................................................69
RESETTING THE SWITCH .............................................................................................................................................................70
Restart System........................................................................................................................................................................70
Factory Reset..........................................................................................................................................................................71

Logout ....................................................................................................................................................................................71
7WEB-BASED NETWORK MANAGEMENT...................................................................................................................72
INTRODUCTION...........................................................................................................................................................................72
GETTING STARTED .....................................................................................................................................................................72
MANAGEMENT ...........................................................................................................................................................................72
Configuration.........................................................................................................................................................................73
Basic Setup..............................................................................................................................................................................................73
TCP/IP Setup...........................................................................................................................................................................................74
Advanced.................................................................................................................................................................................................75
Ports Setup ..............................................................................................................................................................................................75
Port Mirror ..............................................................................................................................................................................................77
Trap Manager ..........................................................................................................................................................................................77
SNMP Manager.......................................................................................................................................................................................78
Download ................................................................................................................................................................................................79
Console....................................................................................................................................................................................................80
Save.........................................................................................................................................................................................................81
Reset........................................................................................................................................................................................................81
Bridge.....................................................................................................................................................................................82
Configure Spanning Tree Protocol..........................................................................................................................................................82
Switch STP.........................................................................................................................................................................................82
Port STP.............................................................................................................................................................................................84
Configure Filtering and Forwarding Table..............................................................................................................................................84
Address Setup...................................................................................................................................................................................84
Custom FDB.......................................................................................................................................................................................85
Filter Table.........................................................................................................................................................................................87
Multicast FDB.....................................................................................................................................................................................88
Configure IGMP Filtering.......................................................................................................................................................................89
IGMP Setup........................................................................................................................................................................................89
IGMP 802.1Q VLAN Setup..............................................................................................................................................................90
IGMP Port Based VLAN Setup........................................................................................................................................................91
Configure VLAN.....................................................................................................................................................................91
Mode Setup .............................................................................................................................................................................................92
Mac-based ...............................................................................................................................................................................................92
Port Based VLAN Setup .........................................................................................................................................................................94
802.1Q VLAN Configuration..................................................................................................................................................................95
Port VID Setup...................................................................................................................................................................................95
Ingress Filtering Check.....................................................................................................................................................................95
802.1Q VLAN Setup.........................................................................................................................................................................96
GVRP Configuration.........................................................................................................................................................................97
GMRP Configuration.........................................................................................................................................................................97
GMRP Configuration ..............................................................................................................................................................................98
Device GMRP Configuration ...........................................................................................................................................................98
802.1Q VLAN Multicast FDB...........................................................................................................................................................98
Trunk......................................................................................................................................................................................99
Port Trunking ........................................................................................................................................................................................100
Monitor.................................................................................................................................................................................100
Traffic Statistics.....................................................................................................................................................................................101
Overview...........................................................................................................................................................................................101
Traffic................................................................................................................................................................................................102
Utilization..........................................................................................................................................................................................103
Errors ................................................................................................................................................................................................103
Analysis ............................................................................................................................................................................................104
Browse Address Table...........................................................................................................................................................................106
Search By MAC...............................................................................................................................................................................106
Search By Port.................................................................................................................................................................................106
Search By VLAN .............................................................................................................................................................................107
Search By None..............................................................................................................................................................................107
IGMP Status..........................................................................................................................................................................................108
Browse GVRP Status ............................................................................................................................................................................109
Browse GMRP Status............................................................................................................................................................................109
History Log............................................................................................................................................................................................110
User......................................................................................................................................................................................110

Add/Modify...........................................................................................................................................................................................111
Utilities.................................................................................................................................................................................111
Save Settings to TFTP Server................................................................................................................................................................111
Save Switch History to TFTP Server.....................................................................................................................................................112
Clear Address Table ..............................................................................................................................................................................113
Help......................................................................................................................................................................................113
8TECHNICAL SPECIFICATIONS...................................................................................................................................114
9INDEX.................................................................................................................................................................................116

Gigabit Ethernet Switch User’s Guide
v
0 ABOUT THIS GUIDE
This user’s guide tells you how to install your DGS-3208TG stand-alone Switch, how to connect it to your
Gigabit Ethernet network, and how to set its configuration using either the built-in console interface or Web-
based management.
Terms
For simplicity, this documentation uses the terms “Switch” (first letter upper case) to refer to the DGS-
3208TG Gigabit Ethernet Switch, and “switch” (first letter lower case) to refer to all Ethernet switches,
including the DGS-3208TG.
Overview of this User’s Guide
♦Chapter 1, “Introduction.” Describes the Switch and its features.
♦Chapter 2, “Unpacking and Setup.” Helps you get started with the basic installation of the Switch.
♦Chapter 3, “Identifying External Components.” Describes the front panel, rear panel, side panels, and
LED indicators of the Switch.
♦Chapter 4, “Connecting the Switch.” Tells how you can connect the DGS-3208TG to your Gigabit
Ethernet network.
♦Chapter 5, “Switch Management Concepts.” Talks about local console management via the RS-232 DCE
console port and other aspects about how to manage the Switch.
♦Chapter 6, “Using the Console Interface.” Tells how to use the built-in console interface to change, set,
and monitor Switch performance and security.
♦Chapter 7, “Web-Based Network Management.” Tells how to manage the Switch through an Internet
browser.
♦Appendix A, “Technical Specifications.” Lists the technical specifications of the DGS-3208TG.

Gigabit Ethernet Switch User’s Guide
1
1
1 INTRODUCTION
This section describes the features of the DGS-3208TG, as well as giving some background information about
Gigabit Ethernet and switching technology.
Gigabit Ethernet Technology
Gigabit Ethernet is an extension of IEEE 802.3 Ethernet utilizing the same packet structure, format, and
support for CSMA/CD protocol, full duplex, flow control, and management objects, but with a tenfold increase
in theoretical throughput over 100-Mbps Fast Ethernet and a hundredfold increase over 10-Mbps Ethernet.
Since it is compatible with all 10-Mbps and 100-Mbps Ethernet environments, Gigabit Ethernet provides a
straightforward upgrade without wasting a company’s existing investment in hardware, software, and trained
personnel.
The increased speed and extra bandwidth offered by Gigabit Ethernet is essential to coping with the network
bottlenecks that frequently develop as computers and their busses get faster and more users use applications
that generate more traffic. Upgrading key components, such as your backbone and servers to Gigabit Ethernet
can greatly improve network response times as well as significantly speed up the traffic between your subnets.
Gigabit Ethernet enables fast fiber-optic and copper connections to support video conferencing, complex
imaging, and similar data-intensive applications. Likewise, since data transfers occur 10 times faster than
Fast Ethernet, servers outfitted with Gigabit Ethernet NIC’s are able to perform 10 times the number of
operations in the same amount of time.
In addition, the phenomenal bandwidth delivered by Gigabit Ethernet is the most cost-effective method to
take advantage of today and tomorrow’s rapidly improving switching and routing internetworking
technologies. And with expected advances in the coming years in silicon technology and digital signal
processing that will enable Gigabit Ethernet to eventually operate over unshielded twisted-pair (UTP) cabling,
outfitting your network with a powerful 1000-Mbps-capable backbone/server connection creates a flexible
foundation for the next generation of network technology products.
Switching Technology
Another key development pushing the limits of Ethernet technology is in the field of switching technology. A
switch bridges Ethernet packets at the MAC address level of the Ethernet protocol transmitting among
connected Ethernet or fast Ethernet LAN segments.
Switching is a cost-effective way of increasing the total network capacity available to users on a local area
network. A switch increases capacity and decreases network loading by making it possible for a local area
network to be divided into different segments which don’t compete with each other for network transmission
capacity, giving a decreased load on each.
The switch acts as a high-speed selective bridge between the individual segments. Traffic that needs to go
from one segment to another is automatically forwarded by the switch, without interfering with any other

Gigabit Ethernet Switch User’s Guide
2
segments. This allows the total network capacity to be multiplied, while still maintaining the same network
cabling and adapter cards.
Switching LAN technology is a marked improvement over the previous generation of network bridges, which
were characterized by higher latencies. Routers have also been used to segment local area networks, but the
cost of a router and the setup and maintenance required make routers relatively impractical. Today’s switches
are an ideal solution to most kinds of local area network congestion problems.
Features
The DGS-3208TG Gigabit Ethernet Switch was designed for easy installation and high performance in an
environment where traffic on the network and the number of users increase continuously.
Switch features include:
Ports
♦Six 100BASE-TX/1000BASE-T (Fast Ethernet/Gigabit Ethernet) ports with cable-ready RJ-45 jacks.
♦Two GBIC (Gigabit Interface Converter) slots, able to accommodate GBICs for all standard Gigabit
Ethernet cabling.
♦RS-232 DCE console port for diagnosing the Switch via a connection to a PC and console/out-of-band
management.
Performance features
♦Store and forward switching scheme capability to support rate adaptation and protocol conversion.
♦Full duplex to allow two communicating stations to transmit and receive at the same time.
♦Data forwarding rate 1,488,100 pps per port at 100% of wire-speed for 1000-Mbps speed.
♦Data filtering rate eliminates all error packets, runts, etc. at 1,488,100 pps per port at 100% of wire-
speed for 1000-Mbps speed.
♦12K active MAC address entry table per device with automatic learning and aging.
♦16 MB packet buffer per device.
♦Supports broadcast storm rate filtering.
♦Supports IGMP snooping.
♦Supports port mirroring.
♦Supports GVRP.
♦Supports GMRP (802.1P).
♦Supports 802.1P priority (tag mode).
♦Supports static filtering (based on MAC Address)

Gigabit Ethernet Switch User’s Guide
3
♦Supports port-based VLAN (overlapping VLANs are excluded).
♦Supports IEEE 802.1Q VLAN.
♦Supports Link Aggregation Capability.
Management
♦RS-232 console port for out-of-band management via a PC.
♦IEEE 802.1d Spanning Tree Algorithm Protocol for creation of alternative backup paths and prevention
of indefinite network loops.
♦Fully configurable either in-band or out-of-band control via SNMP based software.
♦Flash memory for software upgrade. This can be done in-band via BOOTP/TFTP. Out-of-band console
can also initiate a download request.
♦Built-in SNMP management: Bridge MIB (RFC 1493), RMON MIB (RFC 1757), MIB-II (RFC 1213),
VLAN MIB (802.1Q), 802.1D MIB, and D-Link proprietary MIB.

Gigabit Ethernet Switch User’s Guide
4
2
2 UNPACKING AND SETUP
This chapter provides unpacking and setup information for the Switch.
Unpacking
Open the shipping carton of the Switch and carefully unpack its contents. The carton should contain the
following items:
♦One DGS-3208TG Gigabit Ethernet Switch
♦Accessory pack: 2 mounting brackets and screws
♦Four rubber feet with adhesive backing
♦One AC power cord
♦One user’s guide on CD-ROM with Registration Card
If any item is found missing or damaged, please contact your local D-Link reseller for replacement.
Setup
The setup of the Switch can be performed using the following steps:
♦The surface must support at least 5 kg.
♦The power outlet should be within 1.82 meters (6 feet) of the device.
♦Visually inspect the power cord and see that it is secured fully to the AC power connector.
♦Make sure that there is proper heat dissipation from and adequate ventilation around the Switch. Do
not place heavy objects on the Switch.
Desktop or Shelf Installation
When installing the Switch on a desktop or shelf, the rubber feet included with the device must be first
attached. Attach these cushioning feet on the bottom at each corner of the device. Allow enough ventilation
space between the device and the objects around it.

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Figure 2-1. Gigabit Ethernet Switch installed on a Desktop or Shelf
Rack Installation
The DGS-3208TG can be mounted in an EIA standard size, 19-inch rack, which can be placed in a wiring
closet with other equipment. To install, attach the mounting brackets on the switch’s front panel (one on each
side) and secure them with the screws provided.
Figure 2- 2A. Attaching the mounting brackets to the Switch
Then, use the screws provided with the equipment rack to mount the Switch in the rack.
Figure 2-2B. Installing the Switch in an equipment rack

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Power on
The DGS-3208TG Switch can be used with AC power sources 100 - 240 VAC, 50 - 60 Hz. The Switch’s power
supply will adjust to the local power source automatically and may be turned on without having any or all
LAN segment cables connected.
After the device is powered on, the LED indicators should respond as follows:
♦The Power LED indicator will light while the Switch loads onboard software, and should remain on as
long as the switch has power.
♦The Console LED indicator will remain ON if there is a connection at the RS-232 port, otherwise this
LED indicator is OFF.
Power Failure
As a precaution, the Switch should be unplugged in case of power failure. When power is resumed, plug the
Switch back in.

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3
3 IDENTIFYING EXTERNAL COMPONENTS
This chapter describes the front panel, rear panel, side panels, and LED indicators of the Switch
Front Panel
The front panel of the Switch consists of six 1000BASE-T ports, two GBIC (Gigabit Interface Converter) slots,
an RS-232 communication port, and LED indicators.
Figure 3-1. Front panel view of the DGS-3208TG Switch
♦The six 1000BASE-T ports allow 100/1000-Mbps connections to workstations, servers, and networking
devices through four-pair Category 5 twisted-pair cabling.
♦The two GBIC slots accept hot-swappable slide-in modules for 1000BASE-SX multimode optical fiber
and other Gigabit Ethernet cable types.
♦An RS-232 DCE console port is for diagnosing the Switch via a connection to a PC and local console
management.
♦Comprehensive LED indicators display the condition of the Switch and status of the network. A
description of these LED indicators follows (see LED Indicators).
Rear Panel
The rear panel of the Switch consists of an AC power connector. The following shows the rear panel of the
Switch.

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Figure 3-2. Rear panel view of the DGS-3208TG
♦AC Power Connector This is a three-pronged connector that supports the power cord. Plug in the
female connector of the provided power cord into this connector, and the male into a power outlet.
Supported input voltages range from 100 ~ 240 VAC at 50 ~ 60 Hz.
Side Panels
The Switch’s side panels contain the system fans, two on the right and one on the left. The following shows the
Switch’s right side panel.
Figure 3-3. Right side panel view of the DGS-3208TG
♦System Fans These fans are used to dissipate heat. The sides of the system also provide heat vents to
serve the same purpose. Be sure not to block these openings, and to leave adequate space at the rear
and sides of the Switch for proper ventilation. Remember that without proper heat dissipation and air
circulation, system components might overheat, which could lead to system failure.
LED Indicators
The LED indicators of the Switch include Power, Console, Speed, Link/ACT, and Full. The following shows the
LED indicators for the Switch along with an explanation of each indicator.
Figure 3-4. The DGS-3208TG Switch LED indicators