D-Link DES-3250TG User manual

D-Link ™ DES-3250TG
Standalone Layer 2 Switch
User’s Guide

____________________
Information in this document is subject to change without notice.
© 2003 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.
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.
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
October 2003 P/N 651TG3250045

Table of Contents
Introduction.......................................................................................................................................... 1
Features ............................................................................................................................................. 1
Ports ................................................................................................................................................ 1
Performance Features......................................................................................................................... 1
Traffic Classification and Prioritization............................................................................................. 2
Management .................................................................................................................................... 2
Fast Ethernet Technology ................................................................................................................... 3
Gigabit Ethernet Technology............................................................................................................... 3
Unpacking and Setup............................................................................................................................ 4
Unpacking .......................................................................................................................................... 4
Installation ......................................................................................................................................... 4
Desktop or Shelf Installation ............................................................................................................ 4
Rack Installation.............................................................................................................................. 5
Power on............................................................................................................................................. 6
Power Failure ................................................................................................................................... 6
Identifying External Components .......................................................................................................... 7
Front Panel......................................................................................................................................... 7
Rear Panel .......................................................................................................................................... 7
Side Panels......................................................................................................................................... 8
Gigabit Combo Ports........................................................................................................................... 8
LED Indicators ................................................................................................................................... 9
Connecting The Switch........................................................................................................................ 10
Switch to End Node .......................................................................................................................... 10
Switch to Hub or Switch ................................................................................................................... 10
10BASE-T Device ........................................................................................................................... 11
100BASE-TX Device....................................................................................................................... 11
Switch Management and Operating Concepts ..................................................................................... 12
Local Console Management .............................................................................................................. 12
Diagnostic (console) port (RS-232 DCE).......................................................................................... 12
Switch IP Address............................................................................................................................. 13
SNMP ............................................................................................................................................... 14
MIBs................................................................................................................................................. 15
Packet Forwarding............................................................................................................................ 16
802.1w Rapid Spanning Tree ............................................................................................................ 16
Link Aggregation............................................................................................................................... 17
VLANs .............................................................................................................................................. 18
IP Addresses..................................................................................................................................... 23
Internet Protocols ............................................................................................................................. 26
Packet Headers................................................................................................................................. 30
Web-Based Switch Management.......................................................................................................... 35
Introduction ..................................................................................................................................... 35
Before You Start ............................................................................................................................... 35
Getting Started ................................................................................................................................. 35
Configuring the Switch ..................................................................................................................... 36
User Accounts Management........................................................................................................... 36
Save Changes................................................................................................................................. 37
Using Web-Based Management......................................................................................................... 38
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Configuration ................................................................................................................................... 40
IP Address...................................................................................................................................... 41
Switch Information......................................................................................................................... 43
Advanced Settings.......................................................................................................................... 44
Port Configuration.......................................................................................................................... 45
Port Mirroring ................................................................................................................................47
Link Aggregation ............................................................................................................................ 48
IGMP.............................................................................................................................................. 50
Spanning Tree................................................................................................................................53
Forwarding Filtering....................................................................................................................... 58
VLANs............................................................................................................................................ 60
Port Bandwidth .............................................................................................................................. 65
SNTP Settings ................................................................................................................................66
Port Security .................................................................................................................................. 68
QOS (Quality of Service) ................................................................................................................. 70
LACP.............................................................................................................................................. 77
Access Profile Table........................................................................................................................ 79
System Log Servers ........................................................................................................................ 83
PAE Access Entity .......................................................................................................................... 84
Management..................................................................................................................................... 91
Security IP ..................................................................................................................................... 91
User Accounts................................................................................................................................91
SNMPV3......................................................................................................................................... 92
Monitoring...................................................................................................................................... 100
Port Utilization ............................................................................................................................. 100
Packets ........................................................................................................................................ 101
Errors .......................................................................................................................................... 106
Size .............................................................................................................................................. 109
MAC Address ............................................................................................................................... 111
IGMP Snooping Group ................................................................................................................. 113
IGMP Snooping Forwarding.......................................................................................................... 113
VLAN Status ................................................................................................................................ 114
Router Port .................................................................................................................................. 114
Port Access Control ...................................................................................................................... 115
Maintenance................................................................................................................................... 115
TFTP Utilities ............................................................................................................................... 115
Switch History.............................................................................................................................. 117
Ping Test ...................................................................................................................................... 117
Save Changes............................................................................................................................... 118
Reboot Services............................................................................................................................ 118
Logout.......................................................................................................................................... 120
Warranty........................................................................................................................................... 121
All countries and regions except USA ........................................................................................... 121
USA Only ..................................................................................................................................... 122
Technical Specifications .................................................................................................................... 124
Understanding and Troubleshooting the Spanning Tree Protocol....................................................... 126
Index................................................................................................................................................. 135
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D-Link DES-3250TG Standalone Layer 2 Switch
Intended Readers
The DES-3250 User’s Guide contains information for setup and management and of the DES-3250TG switch.
This guide is intended for network managers familiar with network management concepts and terminology.
Notes, Notices, and Cautions
NOTE: A NOTE indicates important information that helps you make better use of your
device.
NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells
you how to avoid the problem.
CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.
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D-Link DES-3250TG Standalone Layer 2 Switch
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.
• 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.
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D-Link DES-3250TG Standalone Layer 2 Switch
Safety Instructions (continued)
• 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.
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.
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D-Link DES-3250TG Standalone Layer 2 Switch
Safety Instructions (continued)
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.
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 and workbench
pads and an antistatic grounding strap.
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D-Link DES-3250TG Standalone Layer 2 Switch
1
INTRODUCTION
This section describes the functionality features of the DES-3250TG.
Features
The DES-3250TG 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
• Forty-eight high-performance NWay ports all operating at 10/100 Mbps for connecting to end
stations, servers and hubs.
• All 48 10/100 UTP ports can auto-negotiate (NWay) between 10Mbps/100Mbps, half-duplex or
full duplex.
• One front panel slide-in module interface for a 2-port 1000BASE-T module (provided) and one
front panel slide-in module interface for a 2-port Mini GBIC Gigabit Ethernet module (optional).
Please note that although these two front panel modules can be used simultaneously, the ports
must be different. For example, if port 49x is used on the Mini GBIC module, port 49x is not
available on the 1000BASE-T module, and vice versa.
• RS-232 DCE Diagnostic port (console port) for setting up and managing the Switch via a
connection to a console terminal or PC using a terminal emulation program.
Performance Features
• Store and forward switching scheme.
• Full and half-duplex for both 10Mbps and 100Mbps connections. The front-port Gigabit Ethernet
module operates at full duplex only. Full duplex allows the switch port to simultaneously
transmit and receive data, and only works with connections to full-duplex capable end stations
and switches. Connections to hubs must take place at half-duplex.
• Auto-polarity detection and correction of incorrect polarity on the transmit and receive twisted-
pair at each port.
• IEEE 802.3z compliant for Mini GBIC ports (optional module).
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D-Link DES-3250TG Standalone Layer 2 Switch
• IEEE 802.3ab compliant for 1000BASE-T (Copper) Gigabit ports (optional module).
• Data forwarding rate 14,880 pps per port at 100% of wire-speed for 10Mbps speed.
• Data forwarding rate 148,800 pps per port at 100% of wire-speed for 100Mbps speed.
• Data filtering rate eliminates all error packets, runts, etc. at 14,880 pps per port at 100% of wire-
speed for 10Mbps speed.
• Data filtering rate eliminates all error packets, runts, etc. at 148,800 pps per port at 100% of
wire-speed for 100Mbps speed.
• 8K active MAC address entry table per device with automatic learning and aging (10 to 1,000,000
seconds).
• 64 MB packet buffer per device.
• Supports Port Mirroring.
• Supports Port Trunking.
• 802.1D Spanning Tree support.
• 802.1Q Tagged VLAN support – up to 255 VLANs per device (one VLAN is reserved for internal
use).
• GVRP – (GARP VLAN Registration Protocol) support for dynamic VLAN registration.
• 802.1p Priority support with 4 priority queues.
• IGMP Snooping support.
Traffic Classification and Prioritization
• Based on 802.1p priority bits.
• Four priority queues.
Management
• RS-232 console port for out-of-band network management via a console terminal or PC.
• Fast Spanning Tree Algorithm Protocol for creation of alternative backup paths and prevention of
network loops.
• SNMP V1, V2C, and V3 are supported.
• Fully configurable in-band control for SNMP based software.
• Flash memory for software upgrades. This can be done in-band via TFTP or out-of-band via the
console.
• Built-in SNMP management:
 SNMP V2-MIB (RFC 1907).
 Bridge MIB (RFC 1493).
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D-Link DES-3250TG Standalone Layer 2 Switch
 MIB-II (RFC 1213).
 IF MIB (RFC 2233).
 Entity MIB (RFC 2737).
 RMON MIB (RFC 1757) – 4 groups. The RMON specification defines the Counters for the
Receive function only. However, the DES-3250TG implements counters for both receive
and transmit functions.
 802.1p MIB (RFC 2674).
 Ether-Like MIB (RFC 2358) – dot3StatsTable.
• Supports Web-based management.
• CLI management support.
• TFTP support.
• BOOTP support.
• DHCP Client support.
• Password enabled.
Fast Ethernet Technology
100Mbps Fast Ethernet (or 100BASE-T) is a standard specified by the IEEE 802.3 LAN committee. It is
an extension of the 10Mbps Ethernet standard with the ability to transmit and receive data at 100Mbps,
while maintaining the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Ethernet
protocol.
Gigabit Ethernet Technology
Gigabit Ethernet is an extension of IEEE 802.3 Ethernet utilizing the same packet structure, format,
and support for full duplex and management objects, but with a tenfold increase in theoretical
throughput over 100Mbps Fast Ethernet and a one hundred-fold increase over 10Mbps Ethernet. Since
it is compatible with all 10Mbps and 100Mbps Ethernet environments, Gigabit Ethernet provides a
straightforward upgrade without wasting a company’s existing investment in hardware, software, and
trained personnel.
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D-Link DES-3250TG Standalone Layer 2 Switch
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 DES-3250TG Standalone Layer 2 Switch
• Mounting kit: 2 mounting brackets and screws
• Four rubber feet with adhesive backing
• One AC power cord
• This User’s Guide with Registration Card
If any item is found missing or damaged, please contact your local D-Link reseller for replacement.
Installation
Use the following guidelines when choosing a place to install the Switch:
• 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 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 should first
be attached. Attach these cushioning feet on the bottom at each corner of the device. Allow adequate
space for ventilation between the device and the objects around it.
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D-Link DES-3250TG Standalone Layer 2 Switch
Figure 2-1. Installing rubber feet for desktop installation
Rack Installation
The DES-3250TG can be mounted in an EIA standard-sized, 19-inch rack, which can be placed in a
wiring closet with other equipment. To install, attach the mounting brackets on the switch’s side panels
(one on each side) and secure them with the screws provided.
Figure 2- 2. Attaching the mounting brackets to the switch
Then, use the screws provided with the equipment rack to mount the switch on the rack.
Figure 2-3. Installing the switch on an equipment rack
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D-Link DES-3250TG Standalone Layer 2 Switch
Power on
The DES-3250TG switch can be used with AC power supply 100 - 240 VAC, 50 - 60 Hz. The power
switch is located at the rear of the unit adjacent to the AC power connector and the system fan. 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 power switch is turned on, the LED indicators should respond as follows:
• All LED indicators will momentarily blink. This blinking of the LED indicators represents a
reset of the system
• The power LED indicator is always on after the power is turned ON
• The console LED indicator will blink while the Switch loads onboard software and performs a
self-test. It will remain ON if there is a connection at the RS-232 port, otherwise this LED
indicator is OFF
Power Failure
As a precaution in the event of a power failure, unplug the switch. When the power supply is restored,
plug the switch back in.
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D-Link DES-3250TG Standalone Layer 2 Switch
3
IDENTIFYING EXTERNAL COMPONENTS
This chapter describes the front panel, rear panel, side panels, and optional plug-in module, and LED
indicators of the DES-3250TG.
Front Panel
The front panel of the Switch consists of LED indicators, an RS-232 communication port, 48 (10/100
Mbps) Ethernet/Fast Ethernet ports, and a pair of Gigabit Ethernet Combo ports for 1000BASE-T (plug-
in module provided) and Mini GBIC connections (optional plug-in module).
Figure 3-1. Front panel view of the Switch
●Comprehensive LED indicators display the status of the switch and the network (see the LED
Indicators section below).
●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.
●Forty-eight high-performance NWay Ethernet ports, all of which operate at 10/100 Mbps for
connections to end stations, servers and hubs. All ports can auto-negotiate between 10Mbps
or 100Mbps and full or half duplex.
●Two Gigabit Ethernet Combo ports for making 1000BASE-T and Mini GBIC connections.
Rear Panel
The rear panel of the switch consists of two fans and an AC power connector.
Figure 3-2. Rear panel view of the Switch
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D-Link DES-3250TG Standalone Layer 2 Switch
The system fans are used to dissipate heat. The sides of the system also provide heat vents to serve the
same purpose. Do not block these openings, and leave at least 6 inches of space at the rear and sides of
the switch for proper ventilation. Be reminded that without proper heat dissipation and air circulation,
system components might overheat, which could lead to system failure. 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. Supported input
voltages range from 100 ~ 240 VAC at 50 ~ 60 Hz.
Side Panels
Each side panel contains heat vents to help to dissipate heat.
Figure 3-3. Side panel views of the Switch
The system fans are used to dissipate heat. The sides of the system also provide heat vents to serve the
same purpose. Do not block these openings, and leave at least 6 inches of space at the rear and sides of
the switch for proper ventilation. Be reminded that without proper heat dissipation and air circulation,
system components might overheat, which could lead to system failure.
Gigabit Combo Ports
In addition to the 48 10/100 Mbps ports, the Switch features two Gigabit Ethernet Combo ports. These
two ports are 1000BASE-T copper ports (provided) and Mini-GBIC ports (optional). See the diagram
below to view the two Mini-GBIC port modules being plugged into the Switch. Please note that although
these two front panel modules can be used simultaneously, the ports must be different. The GBIC port
will always have the highest priority.
Figure 3-4. Mini-GBIC modules plug-in to the Switch
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D-Link DES-3250TG Standalone Layer 2 Switch
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 3-5. The LED Indicators
●Power – This indicator on the front panel should be lit during the Power-On Self Test (POST).
It will light green approximately 2 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 local console
management through the RS-232 console port.
●Link/Act – These indicators are located to the left and right of each port. They are lit when
there is a secure connection (or link) to a device at any of the ports. The LEDs blink whenever
there is reception or transmission (i.e. Activity--Act) of data occurring at a port.
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D-Link DES-3250TG Standalone Layer 2 Switch
4
CONNECTING THE SWITCH
This chapter describes how to connect the DES-3250TG to your Ethernet/Fast Ethernet/Gigabit
Ethernet network. The Switch’s auto-detection feature allows all 48 10/100 ports to support both MDI-
II and MDI-X connections.
Switch to End Node
End nodes include PCs outfitted with a 10, 100, or 10/100 Mbps RJ-45 Ethernet/Fast Ethernet
Network Interface Card (NIC) and most routers.
An end node can be connected to the Switch via a two-pair Category 3, 4, or 5 UTP/STP cable. The end
node should be connected to any of the ports (1x - 48x) on the switch.
Figure 4-1. Switch connected to an End Node
• The Link/Act LEDs in the top row for each UTP port light green when the link is valid. A
blinking LED in the top row indicates packet activity on that port.
Switch to Hub or Switch
These connections can be accomplished in a number of ways using a normal cable.
●A 10BASE-T hub or switch can be connected to the Switch via a two-pair Category 3, 4 or 5
UTP/STP cable.
●A 100BASE-TX hub or switch can be connected to the Switch via a two-pair Category 5
UTP/STP cable.
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D-Link DES-3250TG Standalone Layer 2 Switch
Figure 4-2. Switch connected to a port on a hub or switch using a straight or crossover cable
10BASE-T Device
For a 10BASE-T device, the Switch’s LED indicators should display the following:
●Link/Act indicator is ON.
100BASE-TX Device
For a 100BASE-TX device, the Switch’s LED indicators should display the following:
●Link/Act is ON.
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D-Link DES-3250TG Standalone Layer 2 Switch
5
SWITCH MANAGEMENT AND OPERATING
CONCEPTS
This chapter discusses many of the concepts and features used to manage the switch, as well as the
concepts necessary for the user to understand the functioning of the switch. Further, this chapter
explains many important points regarding these features.
Configuring the switch to implement these concepts and make use of its many features is discussed in
detail in the next chapters.
Local Console Management
A local console is a terminal or a workstation running a terminal emulation program that is connected
directly to the switch via the RS-232 serial console port on the front of the switch. A console connection
is referred to as an ‘Out-of-Band’ connection, meaning that console is connected to the switch using a
different circuit than that used for normal network communications. So, the console can be used to set
up and manage the switch even if the network is down.
Local console management uses the terminal connection to operate the console program built-in to the
switch. A network administrator can manage, control, and monitor the switch from the console
program.
The DES-3250TG contains a CPU, memory for data storage, flash memory for configuration data,
operational programs, and SNMP agent firmware. These components allow the switch to be actively
managed and monitored from either the console port or the network itself (out-of-band, or in-band).
Diagnostic (console) port (RS-232 DCE)
Out-of-band management requires connecting a terminal, such as a VT-100 or a PC running a terminal
emulation program (such as HyperTerminal, which is automatically installed with Microsoft Windows) a
to the RS-232 DCE console port of the Switch. Switch management using the RS-232 DCE console port
is called Local Console Management to differentiate it from management performed via management
platforms, such as D-View or HP OpenView. Web-based Management describes management of the
switch performed over the network (in-band) using the switch’s built-in Web-based management
program. The operations to be performed and the facilities provided by these two built-in programs are
identical.
The console port is set at the factory for the following configuration:
• Baud rate: 9,600
• Data width: 8 bits
• Parity: none
• Stop bits: 1
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