Baseline Switch
2426 PWR Plus
User Guide
Installationsanleitung
3C16491
Part No. 10015243 Rev. AA
Published August 2006
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CONTENTS
Supplying Power to the Switch 18
Checking for Correct Operation 18
Using SFP Tranceivers 19
Inserting an SFP Transceiver 19
Removing an SFP Transceiver 20
Performing Spot Checks 21
ABOUT THIS GUIDE
Conventions
Documentation Comments
Product Registration
7
8
8
1
INTRODUCING THE BASELINE SWITCH
Overview of the Baseline Switch
Features and Capabilities
Autosensing of MDI/MDIX Connections
Autonegotiating 10/100 Mbps Ports
Power-over-Ethernet Capability 10
Gigabit Combo Ports (RJ-45/SFP) 10
Physical Features 10
9
3
CONNECTING TO THE WEB INTERFACE
9
9
Requirements for Accessing the Web Interface 23
Running the Discovery Application 23
Logging On to the Web Interface 25
Navigating the Web Interface 26
Menu 26
Buttons 29
Port Status 29
Accessing the Interface Without Using Discovery 30
DHCP Assigned IP Address 30
Manually Assigned (Static) IP Address 30
9
Front Panel 10
Rear Panel 13
Package Contents 14
2
INSTALLING THE SWITCH
Before You Begin 15
4
CONFIGURING THE SWITCH
Configuration Overview 31
Device Summary Information 31
Administration Settings 33
Positioning the Switch 15
Rack-Mounting or Free-Standing 16
Using the Mounting Kit 16
Montagesatz Anweisungen 17
Placing Units On Top of Each Other 17
Modifying the IP Address Settings 33
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Automatic IP Configuration 33
IP Setup 34
Backup Configuration 35
Restore Configuration 35
Firmware Upgrade 36
Initialize 37
5
TROUBLESHOOTING
Resetting to Factory Defaults 73
Forgotten Password 74
Forgotten Static IP Address 74
Solving LED Issues 74
If the Problem Persists 76
Reboot 37
System Access 38
System Time 40
SNMP 40
A
OBTAINING SUPPORT FOR YOUR PRODUCT
Register Your Product 77
Configuring VLANs 42
VLAN 43
Purchase Value-Added Services 77
Forwarding Tagged/Untagged Frames 47
Sample VLAN Configurations 47
Spanning Tree 49
Access Software Downloads 77
Telephone Technical Support and Repair 78
Contact Us 78
IGMP Snooping 51
IGMP Query 51
Broadcast Storm 51
PoE 52
B
C
TECHNICAL INFORMATION
Related Standards 81
Environmental 81
Physical 81
Configuring Port Settings 53
Administration 53
Speed/Duplex for 1000 Mbps Connections 55
Link Aggregation 56
Spanning Tree per Port 59
Port Mirroring 61
Electrical 81
SAFETY INFORMATION
Important Safety Information 83
Statistics 62
QoS VoIP Traffic Settings 63
Security 66
RADIUS Client 66
802.1X Settings 68
Monitoring 70
Address Table 70
Cable Diagnostics 71
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REGULATORY NOTICES
GLOSSARY
INDEX
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ABOUT THIS GUIDE
This guide describes how to install your 3Com Switch
and perform initial management configurations.
Conventions
Table 1 and Table 2 list conventions that are used
throughout this guide.
This guide is intended for use by those responsible for
installing and setting up network equipment;
consequently, it assumes a basic working knowledge of
LANs (Local Area Networks).
Table 1 Notice Icons
Icon
Notice Type
Description
Diese Anleitung ist fur die Benutzung durch
Netzwerkadministratoren vorgesehen, die fur die
Installation und das einstellen von
Netzwerkkomponenten verantwortlich sind; sie setzt
Erfahrung bei der Arbeit mit LANs (Local Area Networks)
voraus.
Information note
Information that describes
important features or instructions
Caution
Warning
Information that alerts you to
potential loss of data or potential
damage to an application, system,
or device
Information that alerts you to
potential personal injury
If release notes are shipped with your product and the
information there differs from the information in this
guide, follow the instructions in the release notes.
Most user guides and release notes are available in
Adobe Acrobat Reader Portable Document Format (PDF)
or HTML on the 3Com World Wide Web site:
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8
ABOUT THIS GUIDE
Please include the following information when
contacting us:
Table 2 Text Conventions
Convention
Description
■
■
■
Document title
The words “enter”
and “type”
When you see the word “enter” in this
guide, you must type something, and then
press Return or Enter. Do not press Return
or Enter when an instruction simply says
“type.”
Document part number (on the title page)
Page number (if appropriate)
Example:
Keyboard key names
If you must press two or more keys
simultaneously, the key names are linked
with a plus sign (+). Example:
■
■
■
Baseline Switch 2426 PWR Plus User Guide
Press Ctrl+Alt+Del
Part number: 10015243
Page 25
Words in italics
Italics are used to:
■
■
Emphasize a point.
Denote a new term at the place where it
is defined in the text.
Please note that we can only respond to comments and
questions about 3Com product documentation at this
e-mail address. Questions related to technical support or
sales should be directed in the first instance to your
network supplier.
■
Identify menu names, menu commands,
and software button names. Examples:
From the Help menu, select Contents.
Click OK.
Product Registration
Documentation Comments
You can now register your Baseline Switch on the 3Com
Web site to receive up-to-date information on your
product:
Your suggestions are very important to us. They will
help make our documentation more useful to you.
Please e-mail comments about this document to 3Com
at:
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INTRODUCING THE BASELINE SWITCH
1
This chapter provides an overview of the features and
capabilities of the 3Com Baseline Switch 2426 PWR
Plus. It also identifies the contents of the Switch
package and helps you get to know the physical
features of the device.
Autosensing of MDI/MDIX Connections
All ports on the Switch can autosense both medium
dependent interface (MDI) and medium dependent
interface crossover (MDIX) connections. This allows you
to connect network devices to each port using either a
normal straight-through TP (twisted pair) cable or a
‘crossover’ TP cable.
Overview of the Baseline Switch
®
Any port can therefore be used to connect to another
switch port, server, or workstation without additional
configuration.
The 3Com Baseline Switch 2426 PWR Plus is a
versatile, easy-to-use configurable Power-over-Ethernet
(PoE) Switch. It is ideal for users who want the
high-speed performance of 10/100 switching with the
added functionality of Gigabit fiber links, but do not
need sophisticated management capabilities. The Switch
is shipped ready for use. No configuration is necessary.
Autonegotiating 10/100 Mbps Ports
Each 10/100 Mbps port automatically determines the
speed and duplex mode of the connected equipment
and provides a suitable switched connection. The
10/100 Mbps ports can operate in either half-duplex or
full-duplex mode.
Features and Capabilities
The Switch has 24 shielded RJ-45, 10/100 Mbps
auto-negotiating ports and 2 Gigabit combo ports
(which comprised of a RJ-45 port and a Small Form
Factor Pluggable (SFP) transceiver slot) on the front
panel for easy, flexible connection to fiber-based Gigabit
media.
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10
INTRODUCING THE BASELINE SWITCH
Figure 1 Front and Rear Panels
Power-over-Ethernet Capability
The Switch provides 24 front panel RJ-45 ports that
support the IEEE 802.3af Power-over-Ethernet (PoE)
standard. Any 802.3af compliant device attached to a
port can directly draw power from the switch over the
Ethernet cable without requiring its own separate power
source. This capability gives network administrators
centralized power control for devices such as IP phones
and wireless access points, which translates into greater
network availability.
Front Panel
Gigabit Combo Ports (RJ-45/SFP)
The front panel of the Switch contains a series of
indicator lights (LEDs) that help describe the state of
various networking and connection operations.
The 2 Gigabit combo ports support fiber Gigabit
Ethernet short-wave (SX) and long-wave (LX) SFP
transceivers in any combination. This offers you the
flexibility of using SFP transceivers to provide
connectivity between the Switch and a 1000 Mbps core
network.
(1) RJ-45 10/100 Ports
sockets. They cannot be used as standard traditional
telephone sockets, or to connect the unit to a
traditional PBX or public telephone network. Only
connect RJ-45 data connectors, network telephony
systems, or network telephones to these sockets.
Either shielded or unshielded data cables with shielded
or unshielded jacks can be connected to these data
sockets.
When an SFP port is in operation, the corresponding
1000BASE-T port is disabled. The 1000 Mbps
connections can only operate in full duplex mode.
Physical Features
Figure 1 shows the front and rear panels of the Switch.
The numbers in this diagram refer to numbered sections
in “Front Panel” on page 10 and “Rear Panel” on
page 13.
AVERTISSEMENT: Points d’accès RJ-45. Ceux-ci sont
protégés par des prises de données. Ils ne peuvent pas
être utilisés comme prises de téléphone conventionnelles
standard, ni pour la connection de l’unité à un réseau
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Physical Features
11
téléphonique central privé ou public. Raccorder
seulement connecteurs de données RJ-45, systèmes de
réseaux de téléphonie ou téléphones de réseaux à ces
prises.
such as IP phones or wireless access points, and
automatically supply the required DC power.
(2) Gigabit Combo Ports (RJ-45/SFP)
Il est possible de raccorder des câbles protégés ou non
protégés avec des jacks protégés ou non protégés à ces
prises de données.
The Gigabit combo ports (RJ-45/Small Form Factor
Pluggable (SFP) ports) are numbered 25 and 26. If the
link connections on the SFP ports are active, the
associated RJ-45 port of the same number is disabled.
WARNHINWEIS: RJ-45-Porte. Diese Porte sind
geschützte Datensteckdosen. Sie dürfen weder wie
normale traditionelle Telefonsteckdosen noch für die
Verbindung der Einheit mit einem traditionellem
privatem oder öffentlichem Telefonnetzwerk gebraucht
werden. Nur RJ-45-Datenanscluße, Telefonnetzsysteme
or Netztelefone an diese Steckdosen anschließen.
Entweder geschützte oder ungeschützte Buchsen dürfen
an diese Datensteckdosen angeschlossen werden.
The two SFP ports support fiber Gigabit Ethernet
short-wave (SX) and long-wave (LX) SFP transceivers in
any combination. This offers you the flexibility of using
SFP transceivers to provide connectivity between the
Switch and remote 1000 Mbps workgroups or to create
a high-capacity aggregated link backbone connection.
The default active port is the SFP port. The selection of
active ports can be configured via the Web interface.
The Switch has 24 10/100 Mbps auto-negotiating ports.
Each port supports automatic MDI/MDI-X detection and
can be connected to either a 10BASE-T, or 100BASE-TX
device.
The SFP port supports full duplex mode only.
SFP ports are numbered 25 and 26 on the Switch.
When an SFP port is active it has priority over the
10/100/1000 port of the same number. The
corresponding 10/100/1000 port is disabled when an
SFP link connection is active.
For each port, the speed and duplex mode (half duplex
or full duplex for 10BASE-T and 100BASE-TX) are
automatically determined by the capabilities of the
connected device.
The Switch also support IEEE 802.3af-2003 standard
(802.3af) Power-over-Ethernet capabilities. Each port can
detect connected 802.3af-compliant network devices,
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12
INTRODUCING THE BASELINE SWITCH
10/100BASE-TX Ports
Status Meaning
(3) Link/Activity Status LEDs
The first (top) and third row of LEDs, which are colored
yellow or green, show the link, activity and speed status
of the related ports:
Green
Yellow
The link is operating at 100 Mbps.
The link is operating at 10 Mbps.
10/100/1000BASE-T Ports
Status Meaning
Flashing Packets are being received or transmitted on the
Green port at 100 Mbps.
Green
Yellow
The link is operating at 1000 Mbps.
Flashing Packets are being received or transmitted on the
Yellow
port at 10 Mbps.
The link is operating at 10 or 100 Mbps.
Off
The link has not been established, either nothing
is connected to the port, or there is a problem:
Flashing Packets are being received or transmitted on the
Green port at 1000 Mbps.
■
■
■
Check that the attached device is powered
on.
Check that the cable or fiber is the correct
type and is not faulty.
For fiber connections, ensure that the receive
(RX) and transmit (TX) cable connectors are
not swapped.
Flashing Packets are being received or transmitted on the
Yellow
port at 10 or 100 Mbps.
Off
The link has not been established, either nothing
is connected to the port, or there is a problem:
■
■
■
Check that the attached device is powered
on.
Check that the cable or fiber is the correct
type and is not faulty.
For fiber connections, ensure that the receive
(RX) and transmit (TX) cable connectors are
not swapped.
If these checks do not identify the cause of the
problem, it may be that the unit or the device
connected to the port is faulty. Contact your
supplier for further advice.
(4) Duplex Status LEDs
If these checks do not identify the cause of the
problem, it may be that the unit or the device
connected to the port is faulty. Contact your
supplier for further advice.
The second and fourth (bottom) row of Status LEDs,
which are colored yellow (for duplex) or green (for
module active), show the duplex status of the related
ports:
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Physical Features
13
10/100/1000BASE-T Ports
Status Meaning
(6) Self-adhesive Pads
The unit is supplied with four self-adhesive rubber pads.
Do not apply the pads if you intend to rack mount the
unit.
Yellow
Off
The port is operating in full duplex mode.
The port is operating in half duplex mode.
If the unit is to be part of a free-standing stack, apply
the pads to each marked corner area on the underside
of the unit. Place the unit on top of the lower unit,
ensuring that the pads locate with the recesses of the
lower unit.
1000BASE-T only operates in full duplex mode.
10/100BASE-TX can be in half or full duplex mode.
Gigabit Combo Ports
Status Meaning
Rear Panel
The rear panel of the Switch contains a power supply
socket and a recovery button.
Green
Off
SFP is inserted in the slot.
No SFP in the slot.
(7) Power Socket
(5) Power LED
The Switch automatically adjusts to the supply voltage.
Only use the power cord that is supplied with the unit.
The Power LED shows the power status of the Switch.
Status Meaning
(8) Recovery Button
Green
Yellow
The unit is powered on and ready for use.
The recovery button reinitializes the Switch. This returns
the Switch to the factory default settings if, for
example, you have forgotten the default IP address, or
forgotten your user name or password.
Internal power, POST, or loopback test has
failed. Switch is in fail-safe mode.
Off
The unit is not receiving power.
CAUTION: 3Com recommends that you back up your
configuration settings before you recover the Switch,
otherwise your configuration may be lost. Refer to
“Resetting to Factory Defaults” on page 73 for details.
■
Check that the power cord is connected cor-
rectly.
If the unit still does not operate, contact your
supplier.
■
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14
INTRODUCING THE BASELINE SWITCH
Package Contents
Before installing and using the Switch, verify that your
Switch package is complete. The Switch comes with:
■
■
■
■
■
■
One power cord
Four standard height, self-adhesive rubber pads
One mounting kit
Installation CD
This User Guide
Warranty flyer
The Switch is powered from the AC supply.
If any of the above items are damaged or missing,
contact your 3Com network supplier immediately.
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INSTALLING THE SWITCH
2
This chapter contains information that you need to
install and set up the Switch. It covers the following
topics:
WARNHINWEIS: Sicherheitsinformationen. Bevor Sie
Komponenten aus dem Switch entfernen oder dem
verrichten, lesen Sie die Sicherheitsanweisungen, die in
Anhang C (Appendix C) in diesem Handbuch
aufgefuehrt sind.
■
■
■
■
■
■
Before You Begin
Positioning the Switch
Rack-Mounting or Free-Standing
Supplying Power to the Switch
Using SFP Transceivers
ADVERTENCIA: Información de Seguridad. Antes de
instalar o extraer cualquier componente del product o
de realizar tareas de mantenimiento, debe leer la
información de seguridad facilitada en el Apéndice C
(Appendix C) de esta guía del usuario.
Performing Spot Checks
AVVERTENZA: Informazioni di Sicurezza. Prima di
installare o rimuovere qualsiasi componente dal product
o di eseguire qualsiasi procedura di manutenzione,
leggere le informazioni di sicurezza riportate
nell'Appendice C (Appendix C) della presente guida per
l'utente.
Before You Begin
WARNING: Safety Information. Before installing or
removing any components from the Switch or carrying
out any maintenance procedures, read the safety
information provided in Appendix C of this guide.
AVERTISSEMENT: Consignes de Sécurité. Avant
d'installer ou d'enlever tout composant du Switch ou
d'entamer une procédure de maintenance, lisez les
informations relatives à la sécurité qui se trouvent dans
l'Appendice C (Appendix C) de ce guide.
Positioning the Switch
The Switch is suitable for use in an office environment
where it can be free-standing or mounted in a standard
19-inch equipment rack.
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16
INSTALLING THE SWITCH
Alternatively, the Switch can be rack-mounted in a
wiring closet or equipment room. A mounting kit,
containing two mounting brackets and four screws, is
supplied with the Switch.
Rack-Mounting or Free-Standing
The unit can be mounted in a 19-inch equipment rack
using the mounting kit or it can be free standing. Do
not place objects on top of the unit or stack.
When deciding where to position the Switch, ensure
that:
CAUTION: If installing the Switch in a free-standing
stack of different size Baseline or Superstack 3 units, the
smaller units must be installed above the larger ones.
Do not have a free-standing stack of more than six
units.
■
It is accessible and cables can be connected easily.
■
Cabling is away from sources of electrical noise.
These include lift shafts, microwave ovens, and air
conditioning units. Electromagnetic fields can
interfere with the signals on copper cabling and
introduce errors, therefore slowing down your
network.
Using the Mounting Kit
The Switch is supplied with two mounting brackets and
four screws. These are used for rack mounting the unit.
When mounting the unit, you should take note of the
guidelines given in “Positioning the Switch” on
page 15.
■
■
Water or moisture cannot enter the case of the unit.
Air flow around the unit and through the vents on
the side of the case is not restricted (3Com
recommends that you provide a minimum of 25 mm
(1 in.) clearance).
The Switch is 1U (1.7 inches) high and will fit in a
standard 19-inch rack.
■
■
The air is as free from dust as possible.
CAUTION: Disconnect all cables from the unit before
continuing. Remove the self-adhesive pads from the
underside of unit, if already fitted.
Temperature operating limits are not likely to be
exceeded. It is recommended that the unit is installed
in a clean, air conditioned environment.
It is always good practice to wear an anti-static wrist
strap when installing network equipment, connected to
a ground point. If one is not available, try to keep in
contact with a grounded rack and avoid touching the
unit's ports and connectors, if possible. Static discharge
can cause reliability problems in your equipment.
To rack-mount the Switch:
1
2
Place the unit the right way up on a hard, flat surface
with the front facing towards you.
Locate a mounting bracket over the mounting holes on
one side of the unit.
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Rack-Mounting or Free-Standing
17
3
Insert the two screws supplied in the mounting kit and
fully tighten with a suitable screwdriver.
Der Switch ist eine Baueinheit hoch und passt in einen
Standard 19'' (Zoll) Baugruppenträger.
ACHTUNG: Entfernen Sie alle Kabel, bevor Sie
fortfahren. Entfernen Sie die selbstklebenden Polster
(Füße) von der Unterseite der Baugruppe, falls diese
bereits angebracht sind.
Figure 2 Rack Mounting the Unit
1
2
3
Plazieren Sie die Baugruppe aufrecht auf einer harten,
ebenen Fläche mit der Vorderseite zu Ihnen.
Ordnen Sie eine der Halterungen über den Löchern an
der Seite der Baugruppe an.
Stecken Sie zwei der mitgelieferten Schrauben in die
Löcher und drehen Sie diese mit einem geeigneten
Schraubendreher fest.
4
5
Widerholen Sie letzten beiden Schritte auf der anderen
Seite der Baugruppe.
Führen Sie die Baugruppe in den 19" (Zoll)
Baugruppenträger ein und sichern sie die Baugruppe mit
geeigneten Schrauben. (Nicht im Lieferumfang
enthalten).
4
5
Repeat steps 2 and 3 for the other side of the unit.
Insert the unit into the 19-inch rack and secure with
suitable screws (not provided).
6
Schließen Sie alle Kabel wieder an.
6
Reconnect the cables.
Placing Units On Top of Each Other
Montagesatz Anweisungen
If the Switch units are free-standing, up to six units can
be placed one on top of the other. If you are mixing a
variety of Baseline and SuperStack units, the smaller
units must be positioned at the top.
Der Switch wird mit zwei Halterungen und vier
Schrauben geliefert. Diese werde für den Einbau in
einen Baugruppenträger benutzt. Bei der Montage der
Baugruppe beachten Sie die Anweisungen aus
“Positioning the Switch” on page 15.
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18
INSTALLING THE SWITCH
If you are placing Switch units one on top of the other,
you must use the self-adhesive rubber pads supplied.
Apply the pads to the underside of each Switch, sticking
one in the marked area at each corner.
To power on the Switch:
1
2
Plug the power cord into the power socket on the rear
panel of the Switch. Refer to “(7) Power Socket” on
page 13 for more information.
Place the Switch units on top of each other, ensuring
that the pads of the upper unit line up with the recesses
of the lower unit.
Plug the other end of the power cord into a power
outlet.
When the Switch is powered on, the Power LED lights
up. If the Power LED does not light up, refer to “(6)
Self-adhesive Pads” on page 13 for more information.
Supplying Power to the Switch
Power problems can be the cause of serious failures and
downtime in your network. Ensure that the power input
to your system is clean and free from sags and surges to
avoid unforeseen network outages. 3Com recommends
that you install power conditioning, especially in areas
prone to blackout, power dips and electrical storms.
Checking for Correct Operation
After you power on the Switch, it automatically
performs a power-on self-test (POST). During POST, the
Power LED on the front panel of the Switch flashes
green.
When POST is complete, the Power LED turns green. If
the Power LED turns yellow after POST, it means that
POST failed and the Switch has entered fail-safe mode.
The unit is intended to be grounded. Ensure it is
connected to earth ground during normal use. Installing
proper grounding helps to avoid damage from lightning
and power surges.
The following summarizes the possible colors for the
Power LED after POST.
Before powering on the Switch, verify that the network
cables and the power cable are securely connected.
Status Meaning
CAUTION: The Switch has no ON/OFF switch. The only
way to power on and power off the Switch is by
connecting and disconnecting the power cord. This is
called “power cycling”.
Green
Yellow
The unit is powered on and ready to use.
Power-on self-test or loopback test failed. The
Switch is in fail-safe mode. This can happen if a
port or ports fail when the Switch was powered
on.
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Using SFP Tranceivers
19
SFP transceivers are hot-insertable and hot-swappable.
You can remove them from and insert them into any
SFP port without having to power down the Switch.
Off
The unit is not receiving power:
■
Verify that the power cord is connected cor-
rectly, and then try powering on the Switch
again
■
If the Switch still does not operate, contact
your 3Com network supplier
Approved SFP Transceivers
The following list of approved SFP transceivers is correct
at the time of publication:
If POST fails, try the following:
■
Power off the Switch, and then power it on again.
Check the Power LED and see if POST was
successfully completed.
■
3CSFP91 SFP (SX)
3CSFP92 SFP (LX)
■
■
Reset the Switch. See “Resetting to Factory Defaults”
on page 73.
To access the latest list of approved SFP transceivers for
the Switch on the 3Com Web site, enter this URL into
your Internet browser:
CAUTION: Resetting the Switch to its factory defaults
erases all your settings. You will need to reconfigure the
Switch after you reset it.
3Com recommends using 3Com SFPs on the Switch. If
you insert an SFP transceiver that is not supported, the
Switch will not recognize it.
If these do not resolve the issue:
■
Check the 3Com Knowledgebase for a solution. To
visit the 3Com Knowledgebase Web site, start your
Web browser, and then enter
Inserting an SFP Transceiver
To be recognized as valid, the SFP transceiver must have
the following characteristics:
■
Contact your 3Com network supplier for assistance.
■
1000BASE-SX or 1000BASE-LX media type:
Using SFP Tranceivers
■
1000BASE-SX SFP transceiver
The following sections describe how to insert an SFP
transceiver into an SFP slot.
Use this transceiver to connect the Switch directly
to a multimode fiber-optic cable.
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20
INSTALLING THE SWITCH
■
1000BASE-LX SFP transceiver
2
Gently slide the transceiver into the SFP slot until it
clicks into place.
Use this transceiver to connect the Switch directly
to a single mode fiber-optic cable or to multi-
mode fiber using a conditioned launch cable.
CAUTION: SFP transceivers are keyed and can be
properly inserted only one way. If the transceiver does
not click when you insert it, remove it, turn it over, and
reinsert it.
If the SFP transceiver is faulty, it will not operate within
the Switch. See “Troubleshooting” on page 73.
To activate the SFP port:
3
4
5
Remove the plastic protective cover, if fitted.
Connect the fiber cable.
1
toward you and the product label is visible, as shown in
Figure 3. Ensure the wire release lever is closed (in the
upright position).
Attach a male duplex LC connector on the network
cable into the duplex LC connector on the transceiver.
6
7
Connect the other end of the cable to a device fitted
with an appropriate Gigabit Ethernet connection.
Figure 3 Inserting an SFP Transceiver
Check the Module Active LEDs on the front of the
Switch to ensure that the SFP transceiver is operating
correctly.
Removing an SFP Transceiver
Removing an SFP transceiver does not require powering
off the Switch.
To remove an SFP transceiver:
1
2
Disconnect the cable from the transceiver.
Move the wire release lever downwards until it is
pointing toward you.
3
Pull the wire release lever toward you to release the
catch mechanism.
The SFP transceiver should slide out easily.
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Performing Spot Checks
21
Performing Spot Checks
At frequent intervals, you should visually check the
Switch. Regular checks can give you an early warning of
a possible failure; any problems can then be attended to
when there will be least effect on users.
3Com recommends periodically checking the items listed
in Table 1.
Table 1 Items to Check
Cabling
Check that all external cabling connections
are secure and that no cables are pulled
taut.
Cooling fan
Where possible, check that the cooling fan
is fitted near to the front right hand side of
the unit (when viewed from the front).
If you experience any problems operating the Switch,
refer to “Troubleshooting” on page 73.
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22
INSTALLING THE SWITCH
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CONNECTING TO THE WEB INTERFACE
3
The Switch has a built-in Web interface that
you can use to set the admin password, change
■ Accessing the Interface Without Using
the IP address that is assigned to the Switch,
and configure its advanced settings.
Interface
If you only want the Switch to function as a
basic layer 2 switch, you do not need to access
the Web interface and configure the Switch.
To connect to the Web interface, you need the
following:
This chapter provides information on how the
gain access to the Web interface using the Dis-
covery application. It also introduces the menu
items and buttons that are available on the
Web interface.
■ The Discovery application, which is included
CD-ROM that is supplied with your Switch
■ A computer that is connected to the Switch
and that has a Web browser
The following topics are covered:
■ Requirements for Accessing the Web
Running the Discovery Application
Interface
The 3Com Baseline Switch 2426 PWR Plus
CD-ROM contains, among others, the
Discovery application.
■ Running the Discovery Application
■ Logging On to the Web Interface
■ Navigating the Web Interface
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24
CHAPTER 3: CONNECTING TO THE WEB INTERFACE
Figure 4 Welcome Screen of Discovery
The Discovery application can be used for
detecting and connecting to the Switch on the
network. The application will launch a Web
interface that provides the user with options to
configure, modify, and upgrade the Switch.
To use Discovery to connect to the Web
interface, do the following:
1 On a computer that is connected to the Switch,
insert the CD-ROM into its CD drive.
Discovery should start automatically. If it does
not start automatically, go to the \Discovery
folder on the CD-ROM, and then double-click
discovery.exe.
The Welcome screen of Discovery appears.
2 If the computer has multiple network adapters,
select the adapter that connects the computer
to the Switch, and then click Next.
If the computer has only one adapter, click
Next.
Discovery searches the network for 3Com
devices. When detection is complete, the Dis-
covered Devices screen displays detected net-
work devices.
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Logging On to the Web Interface
25
Figure 5 Discovered Devices Screen
Logging On to the Web Interface
After the Web interface loads in your Web
browser, the first page that appears is the
logon screen. On this screen, you need to enter
the administration user name and password to
gain access to the Web interface.
The logon screen also displays the IP address
that the Switch is currently using.
Figure 6 Logon Dialog Box
3 On the Discovered Devices screen, click Base-
line Switch 2426 PWR Plus, and then click Next.
The Completing the 3Com Discovery Applica-
tion screen appears.
4 Click Finish.
To log on to the Web interface:
1 In User name, type admin.
2 Leave the Password field blank.
3 Click OK.
The logon dialog box for the Web interface
appears.
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26
CHAPTER 3: CONNECTING TO THE WEB INTERFACE
Figure 7 Switch Screen Layout
Navigating the Web Interface
Sub-Menu Tabs
The Web interface has been designed to enable
you to easily perform advanced configuration
tasks and view information about the Switch.
Menu
The menu is located on the left side of the Web
interface. When you click an item on the menu,
the related screen appears in the main part of
the interface. Some menu items will give you
sub-menu tabs to choose from.
Menu
System Information
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Navigating the Web Interface
27
Table 1 lists the available items on the menu.
Menu Item
Description
System Access
Contains tabs that allow you to:
■ Display user summary information.
■ Create a new user.
Table 1 Available Menu Items
Menu Item
Description
Device Summary
Contains tabs that allow you to:
■ Modify existing users.
■ Provide a summary of the Switch’s
basic settings and versions of current
components.
■ Remove existing users.
System Time
SNMP
Allows you to set the system time.
■ Set the polling interval in seconds.
Contains tabs that allow you to:
■ Display SNMP summary.
■ Add community strings.
■ Remove community strings.
■ Display the description for each
color coded port.
Save Configuration
Administration
IP Setup
Saves the Switch’s configuration.
Manages the device.
Device
VLAN
Configures the device.
the IP configuration parameters.
Contains tabs that allow you to:
■ Create a VLAN.
Backup
Configuration
Allows you to backup the Switch’s
configuration.
■ Modify a VLAN.
Restore
Configuration
Allows you to restore a saved
configuration.
■ Modify VLAN membership for a
port.
■ Rename a VLAN.
■ Remove a VLAN.
Firmware Upgrade Allows you to upgrade the current
firmware via HTTP.
Initialize
Allows you to reset the Switch to
factory default settings.
■ Display VLAN membership for a
port.
■ Display VLAN information.
Reboot
Allows you to perform system reboot.
Spanning Tree
Allows you to configure a Spanning
Tree Protocol.
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28
CHAPTER 3: CONNECTING TO THE WEB INTERFACE
Menu Item
Description
Menu Item
Description
IGMP Snooping
IGMP Query
Broadcast Storm
PoE
Allows you to enable or disable IGMP
snooping.
Spanning Tree per Contains tabs that allow you to:
Port
■ Display selected spanning tree
information for every port.
Allows you to enable or disable IGMP
query mode.
■ Display individual port spanning tree
information.
Allows you to enable or disable rate
limiting.
■ Modify the spanning tree settings
for a port.
Contains tabs that allow you to:
■ Display PoE summary.
Port Mirroring
Statistics
Monitor traffic going in and out of
ports.
■ Configure PoE settings.
Display statistics for a selected port.
Configures QoS settings.
Port
Configures the ports.
QoS
Administration
Contains tabs that allow you to:
VoIP Traffic Setting Contains tabs that allow you to:
■ Display selected port information for
the entire Switch.
■ Display Voice VLAN summary.
■ Configure Voice VLAN global
settings.
■ Display individual port information.
■ Modify the port settings.
■ Configure Voice VLAN port settings.
Link Aggregation
Contains tabs that allow you to:
■ Display link aggregation summary.
■ Create an aggregation group.
■ Modify the port memberships.
■ Remove an aggregation group.
■ Display port information for Voice
VLAN and Trunk details.
■ Display OUI summary.
■ Add or remove OUI.
Security
Configures security settings.
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Navigating the Web Interface
29
Buttons
Depending on the screen that is currently
Menu Item
Description
Radius Client
Contains tabs that allow you to:
displayed, the following buttons may appear:
■ Display Radius Client information.
■ Configure Radius Client settings and
set authentication parameters.
■ Apply – Click to save and apply any changes
that you have made
802.1X Settings
Contains tabs that allow you to:
■ Cancel – Click to discard any unsaved
■ Display system authentication
summary.
changes
■ Display detailed information per
port.
Port Status
■ Configure system authentication
settings.
There is an image of the Switch’s front panel in
the Device View page, which indicates ports
that are currently in use.
Monitoring
Display Switch monitoring information.
Address Table
Displays MAC address table
information for ports and VLANs.
To configure a port, click the port on the image
for the these following configuration options:
Cable Diagnostics
Contains tabs that allow you to:
■ View detailed port information
■ Configure the port settings
■ View port statistics
■ Display selected cable diagnostics
information for all ports.
■ Display all cable diagnostics
information for a single port.
Help
Displays 3Com contact information
and describes how to use the online
help system.
Log Out
Allows you to securely log off the Web
interface.
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30
CHAPTER 3: CONNECTING TO THE WEB INTERFACE
DHCP Assigned IP Address
If you set the IP address mode to DHCP, check
Accessing the Interface Without Using
Discovery
the DHCP server for the IP address that is
assigned to the Switch, and then use that IP
address to access the Web interface.
The Discovery application works by
automatically detecting the IP address that is
assigned to the Switch, and then using that
address to connect to the Web interface. If you
know the Switch’s IP address, you can access
the Web interface without using Discovery.
For example, if the DHCP server assigned the IP
address 192.168.0.123 to the Switch, start
your Web browser, and then type
This section describes how to access the inter-
face directly, without using Discovery.
Manually Assigned (Static) IP Address
If you do not configure the Switch’s IP address
settings, it will perform auto IP configuration to
assign an IP address to itself. For more informa-
tion, refer to “Automatic IP Configuration” on
page 33.
If you assigned a static IP address to the Switch,
you need to use that IP address to access the
Web interface the next time you want to
configure the Switch.
For example, if you assigned the Switch the IP
address 192.168.0.123, start your Web
To determine the IP address that the Switch will
assign to itself during auto IP configuration,
check the sticker on the base of the Switch.
This sticker contains the MAC address and
default IP address of the Switch.
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CONFIGURING THE SWITCH
4
This chapter provides information on how to
configure the Switch’s advanced features.
Topics include:
You only need to access the Web interface if
you want to:
■ Set the administration password to the Web
■ Device Summary Information
■ Administration Settings
■ Configuring VLANs
■ Configuring Port Settings
■ QoS VoIP Traffic Settings
■ Security
interface
■ Assign an IP address to the Switch
■ Configure the Switch’s advanced features
■ Upgrade the firmware
Device Summary Information
■ Monitoring
The Device Summary screen, which
automatically loads after you log on to the Web
interface, provides a snapshot of the Switch’s
basic settings and versions of current
components.
Configuration Overview
The Switch is shipped ready for use. If you only
want the Switch to function as a basic layer 2
switch, you do not need to access the Web
interface and configure the Switch.
Click Device Summary on the menu. A screen
appears with three tabs that include:
■ Device View
■ Polling Interval
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32
CHAPTER 4: CONFIGURING THE SWITCH
■ Color Key
Polling Interval
Enter the interval in seconds you would like the
Switch to refresh. (Range: 10 to 180 seconds; 0
to disable polling).
Device View
Contains fields that display the system, switch,
and management switch information to
identify the Switch. The fields include Product
Description, System Location, System Contact,
Serial Number, Product 3C Number, MAC
Address, Software Version, Unit Uptime,
Bootroom Version, and Hardware Version.
Figure 9 Polling Interval
Figure 8 Device View
To set the polling interval:
1 Click the Device Summary menu, click Polling
Interval tab.
2 Enter a number between 10 to 180 seconds for
the polling interval. Enter a 0 to disable polling.
If you request for technical assistance from
3Com Support, you may be asked to print out
the information on this screen.
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Administration Settings
33
Color Key
■ Firmware Upgrade
■ Initialize
Description of the color coding.
■ Reboot
Figure 10 Color Key
■ System Access
■ System Time
■ SNMP
Modifying the IP Address Settings
To enable devices on the network to
communicate with the Switch, you need to
assign an IP address to it — either by DHCP or
by assigning a static IP address.
By default, the Switch performs automatic IP
configuration and assigns an IP address to
itself. This is necessary for the Discovery
application to be able to connect to the Web
interface.
Administration Settings
The Administration menu includes eight
administration items:
Automatic IP Configuration
■ IP Setup
When you power on the Switch for the first
time, it automatically uses the default IP
address 169.254.x.y, where xand yare the
last two bytes of its MAC address.
■ Backup Configuration
■ Restore Configuration
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34
CHAPTER 4: CONFIGURING THE SWITCH
To determine the exact IP address that the
Switch assigns to itself during auto IP
3 The Switch repeats step 2 until an unused IP
address is found.
configuration, check the sticker on the base of
the Switch. This sticker contains the MAC
address and default IP address of the Switch.
3Com recommends using automatic IP
configuration only for the initial setup. Once
you gain access to the console, you should
assign an IP address to the Switch (either by
using DHCP or assigning a static IP address) to
ensure successful communication between the
Switch and other network devices.
To detect its IP information using the automatic
configuration process, the Switch goes through
the following sequence of steps:
1 The Switch tries to configure itself with the
default IP address 169.254.x.y, where xand y
are converted from the last two bytes of its
MAC address.
IP Setup
To set the IP address for the Switch:
For example, if the MAC address is
1 Click Administration, then IP Setting on the
menu. The IP Settings screen appears. Follow
the IP Setup Wizard to complete the setup.
08004E000102, the IP address would be
169.254.1.2. This address is used if the Switch
is operating in a standalone mode, or no other
switches on the network have this IP address.
This wizard can also be used to set system
name, location and contact information.
The Switch also assigns the subnet mask
255.255.0.0 (default class B mask) to itself.
2 If this default IP address is already in use on the
network, then the Switch detects this, and
increments the last byte of the MAC address by
one to generate its IP address.
The IP address would therefore become
169.254.1.3.
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Administration Settings
35
Figure 11 IP Settings Screen
Figure 12 Backup Configuration
2 Click OK. You will be prompted to provide a
location where the configuration file will be
saved.
Restore Configuration
To reload configuration settings that you
previously saved to a file:
1 Click Administration, then Restore
Configuration on the menu. The Restore
Configuration screen appears.
Backup Configuration
To save the Switch configuration settings:
Figure 13 Restore Configuration
1 Click Administration, then Backup
Configuration on the menu. The Backup
Configuration screen appears.
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36
CHAPTER 4: CONFIGURING THE SWITCH
Figure 14 Upgrade Screen
2 Click Browse to locate the backup file on your
computer to restore the configuration settings.
3 Click Restore to copy the configuration back to
the Switch.
For security purposes, restoring the
configuration does not change the password.
Firmware Upgrade
The Upgrade facility allows you to install on the
1 Click Administration, then Firmware Upgrade
on the menu. The Firmware Upgrade screen
appears.
Switch any new releases of system firmware
that 3Com may make available.
2 Once you have downloaded the firmware, use
the Browse button to locate the file on your
computer, and then click OK.
Newer versions of firmware can be
downloaded via HTTP and copied to the
Switch; the Switch will restart and apply the
newer system firmware version.
You may need to change the file type in the
dialog box displayed by your Web browser to
*.* to be able to see the file.
The file will be copied to the Switch, and once
this has completed, the Switch will restart.
Although the upgrade process has been
designed to preserve your configuration
settings, 3Com recommends that you make a
backup of the configuration beforehand, in
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Administration Settings
37
case the upgrade process fails for any reason
(for example, the connection between the
computer and the Switch is lost while the new
firmware is being copied to the Switch).
You will lose all your configuration changes.
The Switch LAN IP address will revert to the
default IP address 169.254.x.y. (see “Automatic
IP Configuration” on page 33). You may need
to restart your computer to re-establish
communication with the Switch.
A progress screen displays while the upgrade is
taking place.
Reboot
The upgrade procedure can take a few
Clicking on Administration, then Reboot on the
menu has the same effect as power cycling the
unit. No configuration information will be lost.
Reboot the Switch if you are experiencing
problems and you want to re-establish your
Internet connection.
minutes, and is complete when the progress
bar has finished running and the Power LED
has stopped flashing and is permanently green.
CAUTION: Do not interrupt power to the
Switch during the upgrade procedure. If you
do, the firmware may be corrupted and the
Switch may not start up properly afterwards.
Any network users that are currently accessing
the Internet will have their access interrupted
while the reboot takes place, and they may
need to restart their computers when the
reboot has completed and the Switch is
operational again.
Initialize
To reset the Switch to factory default settings:
1 Click Administration, then Initialize on the
menu.
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38
CHAPTER 4: CONFIGURING THE SWITCH
change the password to prevent unauthorized
access to your network.
System Access
Click Administration, then System Access on
the menu. A screen appears with six system
access tabs:
The password can be up to 8 characters long
and is case-sensitive.
■ User Summary
■ Create User
■ Modify User
■ Remove User
If you forget the administration password after
you set it, refer to “Forgotten Password” on
page 74 for information on how to regain
access to the Web interface.
User Summary
To prevent unauthorized users from accessing
the Web interface and modifying the Switch’s
settings, the interface is password-protected.
Displays the list of user names and their access
level.
Figure 15 User Summary Screen
The default admin account settings are:
■ User name – admin
■ Password – blank (no password)
To ensure that unauthorized users do not
access the Web interface, 3Com recommends
that you set an admin password when you first
configure the Switch.
Even if you do not intend to actively manage
the switch, 3Com recommends that you
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Administration Settings
39
Create User
Modify User
This page allows you to create a user and
define the access level and password for that
user.
This page allows you to modify a user’s access
level and password.
Figure 17 Modify User Screen
Figure 16 Create User Screen
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40
CHAPTER 4: CONFIGURING THE SWITCH
Figure 19 System Time Screen
Remove User
To remove a user from the Switch, click on the
user name, then click Remove.
Figure 18 Remove User Screen
SNMP
Simple Network Management Protocol (SNMP)
is a communication protocol designed
specifically for managing devices on a network.
Equipment commonly managed with SNMP
includes switches, routers and host computers.
SNMP is typically used to configure these
devices for proper operation in a network
environment, as well as to monitor them to
evaluate performance or detect potential
problems.
System Time
Click Administration, then System Time on the
menu. This screen allows you to set the system
time. You can set the Year, Month, Day, Hours,
Minutes, and Seconds.
Click Administration, then SNMP on the menu.
A screen appears with four tabs:
■ Summary
■ Setup
■ SNMP Add
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Administration Settings
41
■ SNMP Remove
SNMP Add
This page allows you to create community
strings for management access.
Summary
Displays the list community access strings.
Figure 22 SNMP Add Screen
Figure 20 SNMP Summary Screen
Setup
Enable or disable the SNMP Agent Status.
Figure 21 SNMP Setup Screen
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42
CHAPTER 4: CONFIGURING THE SWITCH
SNMP Remove
broadcast domains. VLANs confine broadcast
traffic to the originating group and help
eliminate broadcast storms in large networks.
This also provides for a more secure and
cleaner network environment.
This page allows you to remove community
strings.
Figure 23 SNMP Remove Screen
You can create up to 64 VLANs, add specific
ports to a chosen VLAN (so that the port can
only communicate with other ports on the
VLAN), or configure a port make it a member
of all VLANs.
Communication between different VLANs can
only take place if they are all connected to a
router or layer 3 switch.
Configuring VLANs
The Device menu includes five items:
■ VLAN
A virtual LAN (VLAN) is a collection of network
nodes that share the same collision domain,
regardless of their physical location or
connection point in the network. A VLAN
serves as a logical workgroup with no physical
barriers, and allows users to share information
and resources as though located on the same
LAN.
■ Spanning Tree
■ IGMP Snooping
■ IGMP Query
■ Broadcast Storm
You can use the Switch to create VLANs to
organize any group of ports into separate
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Configuring VLANs
43
Figure 24 Setup Screen
VLAN
Click Device, then VLAN on the menu. A screen
appears with seven tabs that include:
■ Setup
■ Modify VLAN
■ Modify Port
■ Rename
■ Remove
■ Port Detail
■ VLAN Detail
Available option on the Setup screen include:
■ VLAN ID – ID of configured VLAN (1-4094,
no leading zeroes)
Setup
For examples on setting up VLANs, refer to
“Sample VLAN Configurations”.
Use the Setup screen to create VLANs on the
Switch. To propagate information about VLAN
groups used on this Switch to external devices,
you must specify a VLAN ID for each VLAN.
CAUTION: At least one port must always be an
untagged member of VLAN 1 (the
management VLAN). If you choose to connect
all ports to VLANs other than VLAN 1, you will
no longer be able to access the Web interface.
If this happens, you will need to reset the
Switch to factory settings.
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44
CHAPTER 4: CONFIGURING THE SWITCH
By default, all ports belong to VLAN 1 as an
untagged member. However, they can belong
to multiple VLANs as a tagged member. Also,
newly created VLANs will initially have no ports
associated with them.
1 Enter a set of VLANs or select all VLANs to
configure, then click Select.
2 From the drop down menu, select a VLAN to
modify.
3 Select a membership use. Available options for
each port include (only one option can be
associated with a single port):
Modify VLAN
Use the Modify VLAN screen to change the
VLAN to which a port belongs, and configure
the port to communicate with all other VLANs,
or a selected VLAN.
■ Tagged
■ Untagged
4 Select ports to associate with the membership,
then click Apply.
Figure 25 Modify VLAN Screen
Modify Port
Use the Modify Port screen to modify the VLAN
membership of a port.
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Configuring VLANs
45
Figure 26 Modify Port Screen
Rename
Use the Rename screen to change the name of
a VLAN.
Figure 27 Rename Screen
1 Select a membership use. Available options for
each port include (only one option can be
associated with a single port):
■ Not a member
■ Tagged
■ Untagged
2 Select a port to associate with the membership.
1 Enter a set of VLANs or select all VLANs to add
to the rename list, then click Select.
3 Enter a VLAN to apply these changes to, then
click Apply.
2 From the list of selected VLANs, choose a VLAN
to rename. Enter a new VLAN name and click
Apply.
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46
CHAPTER 4: CONFIGURING THE SWITCH
Remove
Port Detail
Use the Remove screen to remove a VLAN.
Choose a port to display the tagged and
untagged VLAN memberships it is associated
with.
Figure 28 Remove Screen
Figure 29 Port Detail Screen
VLAN Detail
1 Enter a set of VLANs or select all VLANs to add
to the remove list, then click Select.
Use this screen to display detailed VLAN
information.
2 From the list of selected VLANs choose a VLAN
to remove, or click the Select All button to
select all the VLANs. Click Remove to remove
the VLAN.
1 Enter a set of VLANs or select all VLANs to add
to the details list, then click Select.
2 From drop down menu, choose a VLAN to
display the tagged and untagged VLAN
memberships it is associated with the ports on
the switch.
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Configuring VLANs
47
Figure 30 VLAN Detail Screen
is not a member of that VLAN, the frame is
discarded.
■ When a port receives an untagged frame
and the port is an untagged member of a
VLAN, the frame is accepted and assigned to
that VLAN ID. Otherwise if the port is not an
untagged member of any VLAN, the frame is
discarded.
The Switch will only forward a frame to ports
that are members (tagged or untagged) of the
VLAN to which the frame is assigned. If the
port is an untagged member, the egress frame
will be stripped of the VLAN tag and forwarded
as untagged. However, if the port is a tagged
member, the egress frame is forwarded as
tagged.
Forwarding Tagged/Untagged Frames
Each port on the Switch is capable of passing
tagged or untagged frames.
Sample VLAN Configurations
The following describes how the Switch will
handle tagged and untagged frames.
To illustrate how you can segment network
devices that are connected to the Switch, the
following sample configurations are provided.
■ When a port receives a tagged frame with a
VLAN ID and the port is a member
(untagged or tagged) of that VLAN, the
frame is accepted. Otherwise the if the port
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48
CHAPTER 4: CONFIGURING THE SWITCH
Setting Up Two VLANs on the Same Switch
cannot communicate with each other, do the
following:
Figure 31 illustrates how you can set up a
simple VLAN on the Switch using desktop
connections.
1 Create a new VLAN and set the VLAN ID to 2.
Refer to “Setup” for instructions. VLAN1 is the
default VLAN and already exists.
Figure 31 Desktop VLAN Configuration
2 Set ports 1, 3, and 26 to associate with the
Untagged membership in VLAN2.
3 Click Apply.
will not communicate with any other ports,
unless you add other ports to the VLAN or
change the port configuration.
Setting Up VLAN Across Two Switches
This example explains how you can set up a
VLAN across two Switches using Tagged ports.
This enables ports that are members of the
same VLAN (but are on different switches) to
communicate, provided that a port on each
Switch is set to Tagged, and that these ports
are connected.
If you want to add ports 1, 3, and 26 to VLAN2
(as shown in Figure 31), so that the ports on
the default VLAN1 and the ports on VLAN2
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Configuring VLANs
49
Figure 32 Tagged VLAN Configuration
part of VLAN2 to Untagged. Set one port (for
example, port 16) to Tagged.
Click Apply.
3 On Switch 2, set the ports that you want to be
part of VLAN2 to Untagged. Set one port (for
example, port 8) to Tagged.
Click Apply.
4 Connect the Tagged port on Switch 1 (in this
example, port 16) to the Tagged port on Switch
2 (in this example, port 8).
Those ports on Switch 1 that are members of
VLAN2 can now communicate with those ports
on Switch 2 that are members of VLAN2.
Spanning Tree
Spanning tree is a bridge-based system for
providing fault tolerance on networks and can
be used to detect and disable network loops.
The spanning tree ensures that the optimal
To set up the configuration shown in Figure 32,
do the following:
1 Create VLAN2 on both Switch 1 and Switch 2.
You need not create VLAN1 since it exists by
default.
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50
CHAPTER 4: CONFIGURING THE SWITCH
path is maintained between spanning
tree-compliant networked devices by:
each bridge only forwards traffic between the
Root Port and the ports that are the Designated
Bridge Ports for each network segment. All
other ports are blocked, which means that they
are prevented from forwarding traffic.
■ Disabling redundant paths when the main
paths are operational.
■ Enabling redundant paths if the main paths
fail.
To use spanning tree, choose enabled from the
drop State down menu, fill in the setup
parameters, and click Apply.
Spanning tree uses a distributed algorithm to
select a bridging device that serves as the root
of the spanning tree network. The bridging
device, known as the Root Bridge, generates
bridge protocol data units (BPDUs) on all ports
at a regular interval known as the Hello Time.
All other spanning tree-compliant devices on
the network have a designated Root Port. This
is the Port nearest the Root Bridge and it is
used for receiving the BPDUs initiated by the
Root Bridge. If a bridge does not get a Hello
BPDU after a predetermined interval, the bridge
assumes that the link to the Root Bridge is
down. This bridge will then initiate
Figure 33 Spanning Tree Screen
negotiations with other bridges to reconfigure
the network to reestablish a valid network
topology.
After all the bridges on the network have
determined the configuration of their ports,
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Configuring VLANs
51
Figure 34 IGMP Snooping Setup Screen
IGMP Snooping
This switch uses IGMP (Internet Group
Management Protocol) to query for any
attached hosts that want to receive a specific
multicast service. It identifies the ports
containing hosts requesting to join the service
and sends data out to those ports only. It then
propagates the service request up to any
neighboring multicast switch/router to ensure
that it will continue to receive the multicast
service. This procedure is called multicast
filtering.
IGMP Query
Choose enable or disable from the IGMP Query
Mode drop down menu.
The purpose of IP multicast filtering is to
optimize a switched network’s performance, so
multicast packets will only be forwarded to
those ports containing multicast group hosts or
multicast routers/switches, instead of flooding
traffic to all ports in the subnet (VLAN).
Figure 35 IGMP Query Setup Screen
Choose enable or disable from the IGMP
Snooping Mode drop down menu.
Broadcast Storm
Use the Broadcast Storm page to set the
Switch’s broadcast storm control and threshold
limits.
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52
CHAPTER 4: CONFIGURING THE SWITCH
A broadcast storm is an incorrect packet sent
out on a network that causes most hosts to
respond all at once, typically with wrong
answers that start the process over again.
Broadcast storms use substantial network
bandwidth and may cause network time-outs.
PoE
Click Device, then PoE on the menu. A screen
appears with two tabs that include:
■ Summary
■ Setup
The settings include:
Summary
■ Status – Enables and disables broadcast
Use the Summary tab to display the device and
port PoE settings.
storm control.
■ Packet Rate Threshold – Sets the broadcast
storm threshold (64 to 1000000 kilobits per
second).
Figure 37 PoE Summary Screen
Figure 36 Broadcast Storm Setup Screen
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Configuring Port Settings
53
Setup
Configuring Port Settings
Use the Setup tab to configure the device and
Using the Web interface, you can configure the
speed/duplex, flow control, link aggregation,
and port mirroring settings of each port. You
can also view the current connection status of
each port or shut down or disable ports.
port PoE settings. The settings include:
■ PoE State – Enables and disables PoE for the
switch.
■ Auto – Allows the switch to manage the PoE
budget for selected ports.
The Port menu includes five items:
■ Administration
■ Guarantee – Manually input the port PoE
budget for selected ports.
■ Link Aggregation
■ Spanning Tree per Port
■ Port Mirroring
(Range: 3 - 15.4 Watts)
Figure 38 PoE Setup Screen
■ Statistics
Administration
Three tabs are available on the Port
Administration page:
■ Summary
■ Detail
■ Setup
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CHAPTER 4: CONFIGURING THE SWITCH
Summary
Detail
Use the Summary tab to display Port State,
Flow Control, Speed, Default VLAN ID, Link
Type, or Duplex for all the ports.
Use the Detail tab to display detailed port
setting information for a port.
Figure 40 Port Administration Detail Screen
Figure 39 Port Administration Summary Screen
Setup
Use the Setup tab to configure the port
settings. The following options are available:
■ Port State – Enables and disables the port.
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Configuring Port Settings
55
■ Flow Control – Enables and disables flow
control on the port. When flow control is
enabled for the port, the Switch regulates
the packet flow so that a sending device
does not transmit more packets than a
receiving device can process. If flow control
is disabled, packets may be dropped under
certain periods of high traffic.
If you modify any of these settings, click Apply
to save your changes.
Figure 41 Port Administration Setup Screen
Flow control is disabled by default.
■ Speed – Sets the speed mode of the port.
Available options include auto, 10, 100, and
1000. For 1000 Mbps connections, see
“Speed/Duplex for 1000 Mbps
Connections” below.
Auto (or autonegotiation) sets the optimum
combination of speed and duplex that can
be supported by both ends of the link.
Speed/Duplex for 1000 Mbps Connections
■ Duplex – Sets the duplex mode of the port.
Available options include Auto, Half, and
Full.
You cannot preset the speed to 1000 Mbps. To
run a port at 1000 Mbps, you must enable
autonegotiation for the port. When
CAUTION: It is advised not to enable Flow
Control on ports that will be connected to
telephony and other time sensitive traffic as it
may hamper the QoS performance.
autonegotiation is enabled, the Switch will
automatically connect at 1000 Mbps, providing
the connected device also supports this speed.
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CHAPTER 4: CONFIGURING THE SWITCH
1000 Mbps connections are always full-duplex.
Half-duplex connections are only available for
10 Mbps and 100 Mbps settings.
Link Aggregation
Link aggregation, also called “trunking”, refers
to bonding multiple ports into a single group to
effectively combine the bandwidth into a single
connection or a “trunk”. If you are connecting
the Switch to another switch or to an Internet
backbone, you can aggregate links on the
Switch to increase throughput and prevent
packet loopback between switches.
CAUTION: Before manually setting a port to
full-duplex, verify that the device connected to
the port is also manually set to the same speed
and duplex setting. If connecting link partners
are left to autonegotiate for a link manually set
on this switch to full-duplex, they will always
negotiate to half-duplex, resulting in a duplex
mismatch. This can result in a significant
reduction in network performance. If you are
unsure of how to configure the speed/duplex
setting, simply enable autonegotiation for the
port.
For link aggregation to work, the trunks must
be configured on both ends (switches).
Guidelines for Creating Trunks
■ Any port on the Switch can be used for
creating a trunk.
You cannot modify the speed/duplex settings
of ports that are members of a trunk or
aggregated link.
■ This switch supports a maximum of four
trunks.
■ Each trunk may contain up to four
members.
Supported SFP transceivers only operate at
1000 Mbps full-duplex. Inserting an SFP
transceiver into a gigabit port disables the
corresponding RJ-45 port, even if no fiber cable
is inserted.
■ A port may only be a member of one trunk
at any one time.
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Configuring Port Settings
57
Figure 42 Link Aggregation Summary Screen
■ All ports in a trunk must be configured in an
identical manner, including communication
mode (that is, speed, duplex mode and flow
control).
Four tabs are available on the Port Link
Aggregation page:
■ Summary
■ Create
Create
■ Modify
■ Remove
Use the Create tab to add ports to a group
membership.
Figure 43 Link Aggregation Create Screen
Summary
Use the Summary tab to display Group ID, Port
members, and Link Type for a list of link
aggregate groups.
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CHAPTER 4: CONFIGURING THE SWITCH
To create a new link aggregation group:
To modify a link aggregation group:
1 Enter a link aggregation group ID in the box
1 Select the aggregation group to modify, then
click Select.
field.
2 Select the ports to add to the goup.
3 Click Apply.
2 Select the ports to add to the goup.
3 Click Apply.
Modify
Remove
Use the Modify tab reassign port members to a
link aggregation group.
Use the Remove tab delete a link aggregation
group.
Figure 44 Link Aggregation Modify Screen
Figure 45 Link Aggregation Remove Screen
To remove a link aggregation group:
1 From the link aggregation group list, select the
aggregated group to remove.
2 Click Remove.
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Configuring Port Settings
59
used for receiving the BPDUs initiated by the
Root Bridge. If a bridge does not get a Hello
Spanning Tree per Port
This administrative tool supports the
BPDU after a predetermined interval, the bridge
assumes that the link to the Root Bridge is
down. This bridge will then initiate negotiations
with other bridges to reconfigure the network
to re-establish a valid network topology.
configuration of the Switch to forward, or
block and discard 802.1D spanning tree BPDU
packets.
Spanning tree is a bridge-based system for
providing fault tolerance on networks and can
be used to detect and disable network loops.
The spanning tree ensures that the optimal
path is maintained between spanning
After all the bridges on the network have
determined the configuration of their ports,
each bridge only forwards traffic between the
Root Port and the ports that are the Designated
Bridge Ports for each network segment. All
other ports are blocked, which means that they
are prevented from forwarding traffic.
tree-compliant networked devices by:
■ Disabling redundant paths when the main
paths are operational.
Three tabs are available on the Spanning Tree
per Port page:
■ Enabling redundant paths if the main paths
fail.
■ Summary
■ Detail
Spanning tree uses a distributed algorithm to
select a bridging device that serves as the root
of the spanning tree network. The bridging
device known as the Root Bridge generates
BPDUs (Bridge Protocol Data Units) on all ports
at a regular interval known as the Hello Time.
All other spanning tree-compliant devices on
the network have a designated Root Port. This
is the Port nearest the Root Bridge and it is
■ Setup
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CHAPTER 4: CONFIGURING THE SWITCH
Summary
Detail
Use the Summary tab to display Status, Edged
Port, Link Type, Path Cost, State, or Port Priority
for all the ports.
Use the Detail tab to display detailed spanning
tree information for a port.
Figure 47 Spanning Tree Detail Screen
Figure 46 Spanning Tree Summary Screen
Setup
Use the Setup tab to configure the spanning
tree settings for each port. The following
options are available:
■ Status – Enables and disables spanning tree
for the port.
■ Edged Port – Enables and disables edged
port for the port.
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Configuring Port Settings
61
■ Link Type – Choose between Point-to-Point,
Port Mirroring
Shared, or Auto for the link type.
The Switch allows you to monitor traffic going
in and out of a particular port. For traffic
monitoring to work, you need to attach a
network analyzer to one port and use it to
monitor the traffic of other ports in the stack.
■ Path Cost – The path cost is used to
determine the best path between devices.
The path cost method is used to determine
the range of values that can be assigned to
each interface.
To set up traffic monitoring, you need to set an
analysis port (the port that is connected to the
analyzer), and a monitor port (the port that is
to be monitored). Once the pair is defined, and
you enable traffic monitoring, the Switch takes
all the traffic going in and out of the monitor
port and copies it to the analysis port.
■ Port Priority – Used in selecting the root
device, root port, and designated port. The
device with the highest priority becomes the
STA root device. However, if all devices have
the same priority, the device with the lowest
MAC address will then become the root
device.
CAUTION: The analyzer port should have a
higher bandwidth than the mirror port.
Otherwise, the Switch may not be able to copy
all traffic effectively during periods of high
traffic.
If you modify any of these settings, click Apply
to save your changes.
Figure 48 Spanning Tree Setup Screen
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CHAPTER 4: CONFIGURING THE SWITCH
Figure 49 Port Mirroring Setup Screen
Statistics
The Switch allows you to statistics of a
particular port.
Figure 50 Port Statistics Screen
To set up port mirroring:
1 Connect a network analyzer to a port.
2 Access the Web interface. Click Port, then Port
Mirroring on the menu. The Port Monitoring
Setup Screen appears.
3 Select the port number under Monitor Port to
which you want to monitor. Traffic to and from
this port will be forwarded to the analyser port.
4 Select the port number under Analyser Port to
which you connected the network analyzer.
Traffic to and from the selected mirrored ports
will be forwarded to this port.
To display statistics for a port:
1 Access the Web interface. Click Port, then
Statistics on the menu. The Port Statistics
Screen appears.
5 Under Mirror Type, select to monitor incoming
traffic, outgoing traffic, or both.
6 Click Apply.
2 Select the a port, and enter a refresh interval.
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QoS VoIP Traffic Settings
63
Figure 51 QoS VoIP Summary Screen
3 Click Apply.
QoS VoIP Traffic Settings
Using the Web interface, you can configure the
Voice over Internet Protocol (VoIP) settings.
The QoS VoIP Traffic Setting menu includes six
tabs:
■ Summary
■ Setup
■ Port Setup
■ Port Detail
■ OUI Summary
■ OUI Modify
Setup
Use the Setup tab to configure the global
settings for Voice VLAN. The following options
are available:
■ Voice VLAN Status – Enable or disable Voice
Summary
VLAN for the switch.
Use the Summary tab to display the global
settings for Voice VLAN.
■ Voice VLAN ID – Input the Voice VLAN ID for
the switch.
■ Voice VLAN Aging Time – Input the aging
time.
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CHAPTER 4: CONFIGURING THE SWITCH
You must first create a VLAN from the VLAN
Setup page before you can assign and
configure a Voice VLAN.
To configure the Voice VLAN settings for ports:
1 Select Voice VLAN Mode, and Security settings.
2 Select the ports you would like to apply these
Figure 52 QoS VoIP Setup Screen
settings to.
3 Click Apply.
Figure 53 QoS Port Setup Screen
Port Setup
Use the Port Setup tab to configure the port or
trunk setting for Voice VLAN. The following
options are available:
■ Voice VLAN Port Mode– Select between
None, Manual, or Auto.
■ Voice VLAN Port Security – Enable or disable
the security.
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QoS VoIP Traffic Settings
65
Figure 55 QoS OUI Summary Screen
Port Detail
Use the Port Detail tab to display the Voice
VLAN information for selected ports.
Figure 54 QoS Port Detail Screen
OUI Add
Use the OUI Modify tab to add to the list of
Organizational Unique Identifier. The following
options are available:
■ Telephony OUI – Input a new company
identifier to add to the list.
OUI Summary
■ Description – Input a description for the new
company identifier.
Use the OUI Summary tab to display the list of
Organizational Unique Identifier for a company
and their description.
To add to the OUI list:
1 Enter a Telephony OUI and description.
2 Click Add.
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66
CHAPTER 4: CONFIGURING THE SWITCH
To remove an OUI from the list:
RADIUS Client
Remote Authentication Dial-in User Service
1 Select a Telephony OUI from the list.
2 Click Remove.
(RADIUS) is a logon authentication protocol
that uses software running on a central server
to control access to RADIUS-aware devices on
the network. An authentication server contains
a database of multiple user name/password
pairs with associated privilege levels for each
user or group that require management access
to a switch.
Figure 56 QoS OUI Modify Screen
The RADIUS Client menu includes two tabs:
■ Detail
■ Configure
Detail
Use the Detail tab to display the RADIUS Client
settings.
Security
Using the Web interface, you can configure the
RADIUS Client and 802.1X settings.
The Security menu includes two items:
■ RADIUS Client
■ 802.1X Settings
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Security
67
Figure 57 RADIUS Client Detail Screen
■ UDP port – The RADIUS server UDP port
used for authentication messages.
■ Key – Sets the RADIUS encryption key.
After you have filled in the parameters, click
Apply to save your changes.
Figure 58 RADIUS Client Configure Screen
Configure
Use the Configure tab to configure the RADIUS
settings. The following parameters are
available:
■ Max Retries – Sets the number of retries of
sending authentication requests.
■ Timeout – Sets the interval between sending
authentication requests.
■ IP Address – The IP address of the RADIUS
server.
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CHAPTER 4: CONFIGURING THE SWITCH
Figure 59 802.1X Summary Screen
802.1X Settings
The IEEE 802.1X (dot1x) standard defines a
port-based access control procedure that
prevents unauthorized access to a network by
requiring users to first submit credentials for
authentication.
The 802.1X settings menu includes three tabs:
■ Summary
■ Detail
■ Setup
Summary
Use the Summary tab to display the 802.1X
authentication settings.
Detail
Use the Detail tab to display detailed 802.1X
authentication information for a port..
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Security
69
Figure 60 802.1X Detail Screen
■
Auto – Requires a dot1x-aware client to
be authorized by the authentication
server. Clients that are not dot1x-aware
will be denied access.
■
■
Force-Authorized – Forces the port to
grant access to all clients, either
dot1x-aware or otherwise.
Force-Unauthorized – Forces the port to
deny access to all clients, either
dot1x-aware or otherwise.
■ Maximum Request – Sets the maximum
number of times the switch port will
retransmit an EAP request packet to the
client before it times out the authentication
session. (Range: 1-10; Default 2)
Setup
Use the Setup tab to configure the 802.1X
authenticaion settings. The following fields are
available:
■ Mode Reauthentication – Sets the client to
be re-authenticated after the interval
specified by the Re-authentication Period.
Re-authentication can be used to detect if a
new device is plugged into a switch port.
(Default: Disabled)
■ System Authentication – Sets the global
setting for 802.1X. (Default: Disabled)
■ Operation Mode – Allows single or multiple
hosts (clients) to connect to an
802.1X-authorized port. (Options:
Single-Host, Multi-Host; Default:
Single-Host)
■ Max Count – The maximum number of
hosts that can connect to a port when the
Multi-Host operation mode is selected.
(Range: 1-1024; Default: 5)
■ Mode – Sets the authentication mode to
one of the following options:
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CHAPTER 4: CONFIGURING THE SWITCH
Figure 61 802.1X Setup Screen
■ Reauthentication Period – Sets the time
period after which a connected client must
be re-authenticated. (Range: 1-65535
seconds; Default: 3600 seconds)
■ Quiet Period – Sets the time that a switch
port waits after the Max Request Count has
been exceeded before attempting to acquire
a new client. (Range: 1-65535 seconds;
Default: 60 seconds)
■ Transmit Period – Sets the time period
during an authentication session that the
switch waits before re-transmitting an EAP
packet. (Range: 1-65535; Default: 30
seconds)
Monitoring
Using the Web interface, you can display
address table information and cable
diagnostics.
After you have filled in the parameters, click
Apply to save your changes.
The Monitoring menu includes two items:
■ Address Table
■ Cable Diagnostics
Address Table
Use the Address Table Summary screen to
display the Address Table information. You can
query by selecting a port, choosing a VLAN, or
entering in a MAC Address, then click Select.
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Monitoring
71
Figure 62 Address Table Screen
Summary
Use the Summary tab to display information on
Test Result, Cable Fault Distance, or Last
Update for every port on the switch.
Figure 63 Cable Diagnostic Summary Screen
Cable Diagnostics
The Switch provides cable diagnostic, which
helps you detect and resolve issues with the
attached cables.
The Cable Diagnostics menu includes two tabs:
■ Summary
■ Diagnostics
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CHAPTER 4: CONFIGURING THE SWITCH
Diagnostics
Use the Diagnostics tab to display individual
port information on Test Result, Cable Fault
Distance, and Last Update.
Figure 64 Cable Diagnostic Screen
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TROUBLESHOOTING
5
This chapter lists some issues that you may
CAUTION: Resetting the Switch to factory
defaults erases all your settings. You will need
to reconfigure the Switch after you reset it.
encounter while installing, using, and manag-
ing the Switch, with suggested courses of cor-
rective action to take.
To reset the Switch to its factory defaults:
If you encounter an issue that is not listed here
and you cannot solve it, check the 3Com
Knowledgebase at
1 Using the tip of a pen (or a similar object), press
the Recovery button on the rear panel of the
Switch. See Figure 1 for illustration.
contacting your local technical support
representative.
2 Power off the Switch, and then power it back
on, while keeping the Recovery button pressed.
3 Release the Recovery button.
4 Reset the Switch either by:
For more information on how to obtain
support for your Switch, refer to Appendix A.
■ Accessing the Web interface using Discov-
ery, and then pressing the RESET button on
the Initialize tab of the Administration
menu. After you click RESET, a confirmation
message appears. Click OK to confirm.
Resetting to Factory Defaults
If the Switch does not operate normally or if
the firmware becomes corrupted, you can reset
the Switch to factory defaults.
■ Powering off the Switch, and then powering
it back on.
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74
CHAPTER 5: TROUBLESHOOTING
The Switch will perform automatic IP configu-
ration after you reset it. See “Automatic IP
Configuration” on page 33 for more informa-
tion.
For information on using the Discovery
application, refer to “Running the Discovery
Application” on page 23.
Solving LED Issues
Forgotten Password
This section lists some issues that are related to
the LEDs on the front panel of the Switch. For
information on basic LED checks, refer to the
following topics in Chapter 1:
If you forget the password to the Web interface
Switch to regain access. See “Resetting to Fac-
tory Defaults” on page 73 for instructions.
■ (2) Gigabit Combo Ports (RJ-45/SFP)
■ (3) Link/Activity Status LEDs
■ (5) Power LED
After resetting the Switch, log on to the Web
interface using the default admin account set-
tings:
■ User name – admin
A link is connected, but the Link/Activity
LED for the port is off.
■ Password – blank (no password)
There is a problem with this connection. Verify
that:
Forgotten Static IP Address
■ The device being connected to is powered
If you forget the static IP address that you
assigned to the Switch and you need to access
the Web interface, use the Discovery applica-
tion to automatically detect the IP address and
connect to the interface.
on and operating correctly.
■ The cable is connected at both ends.
■ The cable is not damaged.
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Solving LED Issues
75
■ If the connection is to a workstation, that
the workstation's network interface is
installed and configured correctly.
The Link/Activity LED is on, but network
performance is poor
The Switch supports full-duplex autonegotia-
■ The correct category of cable is being used
for the required link speed. Category 3
cables can be used for 10BASE-T operation
only. Category 5 cable is required for
100BASE-TX or 1000BASE-T. 3Com recom-
mends Category 5e or 6 cables for
1000BASE-T operation.
tion. If the connected device does not support
autonegotiation, ensure that it is configured for
half-duplex operation only. If the connected
device has autonegotiation disabled or overrid-
den, and is configured as full-duplex, the
Switch will configure the link as half-duplex,
causing a mismatch that will reduce network
performance when data is transmitting and
receiving simultaneously on the same link.
A fiber cable is connected, but the Module
Active LED is off.
Ensure that the connected device has either:
Verify that:
■ Autonegotiation enabled, or
■ The fiber cable is in good condition.
■ The SFP module is correctly inserted.
■ The ports are configured for half-duplex
operation
■ A 3Com SFP module is being used. Refer to
“Approved SFP Transceivers” on page 19 for
details.
■ The equipment at the far end is installed and
correctly configured.
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76
CHAPTER 5: TROUBLESHOOTING
All ports appear to show continual activity.
There may be broadcast storms on the net-
work. Remove port connections one at a time,
waiting a few seconds between each port. If
the LEDs go off after removing a port connec-
tion, the device that was connected to that
port is introducing an excessive amount of
broadcast frames to the network. Some pieces
of network equipment operate by sending out
broadcast frames regularly.
Refer to the documentation that accompanies
the device for information on disabling the
broadcast operation.
If the Problem Persists
If the problem persists and the unit still does
not operate successfully, contact your 3Com
network supplier with the following informa-
tion before returning the unit:
■ Product number and serial number (printed
on a label supplied with the unit).
■ A brief description of the issue
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OBTAINING SUPPORT FOR YOUR PRODUCT
A
are available to manage your installation with minimal
disruption to your network. Expert assessment and
implementation services are offered to fill resource gaps
and ensure the success of your networking projects.
More information on 3Com maintenance and
Register Your Product
Warranty and other service benefits start from the date
of purchase, so it is important to register your product
quickly to ensure you get full use of the warranty and
other service benefits available to you.
Contact your authorized 3Com reseller or 3Com for a
complete list of the value-added services available in
your area.
Warranty and other service benefits are enabled through
product registration. Register your product at
http://eSupport.3com.com/. 3Com eSupport
services are based on accounts that you create or have
authorization to access. First time users must apply for a
user name and password that provides access to a
number of eSupport features including Product
Registration, Repair Services, and Service Request. If you
have trouble registering your product, please contact
3Com Global Services for assistance.
Troubleshoot Online
You will find support tools posted on the 3Com Web
site at www.3com.com/
3Com Knowledgebase helps you troubleshoot 3Com
products. This query-based interactive tool is located at
contains thousands of technical solutions written by
3Com support engineers.
Purchase Value-Added Services
To enhance response times or extend warranty benefits,
contact 3Com or your authorized 3Com reseller.
SM
Value-added services like 3Com Express and
Access Software Downloads
SM
Guardian can include 24x7 telephone technical
Software Updates are the bug fix/maintenance
releases for the version of software initially purchased
with the product. In order to access these Software
support, software upgrades, onsite assistance or
advance hardware replacement. Experienced engineers
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78
APPENDIX A: OBTAINING SUPPORT FOR YOUR PRODUCT
Updates you must first register your product on the
■
A list of system hardware and software, including
revision level
■
■
Diagnostic error messages
First time users will need to apply for a user name and
password. A link to software downloads can be found
Product Support heading at www.3com.com/
Details about recent configuration changes, if
applicable
To send a product directly to 3Com for repair, you must
first obtain a return authorization number (RMA).
Products sent to 3Com, without authorization numbers
clearly marked on the outside of the package, will be
returned to the sender unopened, at the sender’s
expense. If your product is registered and under
warranty, you can obtain an RMA number online at
http://eSupport.3com.com/. First time users
will need to apply for a user name and password.
Software Upgrades are the feature releases that
follow the software version included with your original
product. In order to access upgrades and related
documentation you must first purchase a service
contract from 3Com or your reseller.
Telephone Technical Support and Repair
To obtain telephone support as part of your warranty
and other service benefits, you must first register your
product at http://eSupport.3com.com/
Contact Us
3Com offers telephone, e-mail and Internet access to
technical support and repair services. To access these
services for your region, use the appropriate telephone
number, URL or e-mail address from the list below.
Warranty and other service benefits start from the date
of purchase, so it is important to register your product
quickly to ensure you get full use of the warranty and
other service benefits available to you.
Telephone numbers are correct at the time of
publication. Find a current directory of support
telephone numbers posted on the 3Com Web site at
When you contact 3Com for assistance, please have the
following information ready:
■
Product model name, part number, and serial
number
■
Proof of purchase, if you have not pre-registered
your product
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Contact Us
79
.
Country
Telephone Number
Country
Telephone Number
Austria
0800 297 468
0800 71429
Asia, Pacific Rim Telephone Technical Support and Repair
Belgium
Denmark
Finland
800 17309
Australia
Hong Kong
India
1 800 678 515
800 933 486
0800 113153
0800 917959
0800 182 1502
06800 12813
1 800 553 117
1800 945 3794
800 879489
France
+61 2 9424 5179 or
000800 6501111
001 803 61 009
00531 616 439 or
03 3507 5984
Germany
Hungary
Ireland
Indonesia
Japan
Israel
Italy
Malaysia
1800 801 777
0800 446 398
Luxembourg
Netherlands
Norway
Poland
800 23625
New Zealand
Pakistan
0800 0227788
800 11376
+61 2 9937 5083
1235 61 266 2602 or
1800 1 888 9469
800 810 3033
Philippines
00800 4411 357
800 831416
Portugal
South Africa
Spain
Sweden
Switzerland
U.K.
P.R. of China
Singapore
S. Korea
0800 995 014
900 938 919
020 795 482
0800 553 072
0800 096 3266
800 6161 463
080 333 3308
Taiwan
00801 611 261
001 800 611 2000
Thailand
You can also obtain support in this region using the following
e-mail: [email protected]
You can also obtain support in this region using the following
Or request a repair authorization number (RMA) by fax using
this number: +65 543 6348
Europe, Middle East, and Africa Telephone Technical
Support and Repair
From anywhere in these
regions, call:
+44 (0)1442 435529
From the following countries, you may use the numbers
shown:
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80
APPENDIX A: OBTAINING SUPPORT FOR YOUR PRODUCT
Country
Telephone Number
Country
Telephone Number
Latin America Telephone Technical Support and Repair
Puerto Rico
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
Saba Anquila
St. Kitts Neives
St. Lucia
Antigua Barbuda
Argentina Local Number
Argentina
Argentina
Aruba
AT&T +800 988 2112
54 11 5556 3200
0 810 444 3COM
St. Vincent
Suriname
810 44 32 66
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
55 11 5643 2700
Trinidad and Tobago
Turks and Caycos
Uruguay - Montevideo
Venezuela
Bahamas
Barbados
Belize
Bermuda
Virgin Islands
Bolivia
Brazil Local Number
Brazil
You can also obtain support in this region using the following:
Spanish speakers, enter the URL:
800 133 266
British Virgin Islands
Cayman Islands
Chile
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
57 1 592 5000
Portuguese speakers, enter the URL:
Columbia Local Number
Colombia
800 011 3266
English speakers in Latin America should send e-mail to:
Costa Rica
Curacao
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
52 55 52 01 00 04
01 800 849CARE
Dominica
Dominique
Equador
US and Canada Telephone Technical Support and Repair
El Salvador
French Guiana
Grenada
1 800 876 3266
Guadalupe
Guatemala
Guyana
Haiti
Honduras
Jamaica
Mexico Local Number
Mexico
Mexico
01 800 849 2273
Monserrat
Nicaragua
Panama
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
AT&T +800 998 2112
Paraguay
Peru
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TECHNICAL INFORMATION
B
Physical
Related Standards
44 cm (17.3 in.)
23.8 cm (9.4 in.)
4.4 cm (1.7 in.) or 1U
3.2 kg (7.05 lb)
Width
The Baseline Switch 2426 PWR Plus has been designed
to the following standards:
Depth
Height
IEEE 802.3 (Ethernet), IEEE 802.3u (Fast
Functional
Weight
Mounting
Ethernet), IEEE 802.3ab and IEEE 802.3z
(Gigabit Ethernet), IEEE 802.3x (Flow Control),
IEEE 802.1D 1993 (Bridging), IEEE D802.1Q
1998 (Virtual LAN)
Free standing, or 19 in. rack mounted using
the mounting kit supplied
4096
MAC
Electrical
Address
IEC 320
Power Inlet
UL/CUL (UL 60950-1, CSA 22.2 No 60950-1),
TUV/GS (EN 60950-1), IEC 60950-1, CB
Safety
50/60 Hz (+/- 3 Hz)
100–240 VAC (auto range)
3 Amp (maximum)
205 W
AC Line Frequency
Input Voltage
Current Rating
EN50081-1, EN 55022 Class A, EN50082-1,
IEC 1000-4-2/3/4/6, EN60555-2 Class A, EN
60555-3, FCC Part 15 Subpart B Class A,
EMC Emis-
sions
Maximum Power
Consumption
EN 55024
Immunity
154 BTU/hr
Maximum Power
Dissipation
Environmental
0-45 °C (32–113 °F)
Operating Tempera-
ture
15.4 W per port
Maximum
Pover-over-Ethernet
Budget
-40-70 °C (-40-158 °F)
Storage Tempera-
ture
0-95% (non-condensing)
Humidity
Standard
EN 60068 (IEC 68)—various parts
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82
APPENDIX B: TECHNICAL INFORMATION
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SAFETY INFORMATION
C
Important Safety Information
You can find the 3Com Switch Family Safety and
Regulatory Information manual on the product CD-ROM
that was included with your switch. You can also
download the safety manual from the 3Com Web site:
Please refer to the safety information found in the
3Com Switch Family Safety and Regulatory Information
manual included with this product.
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84
APPENDIX C: SAFETY INFORMATION
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REGULATORY NOTICES
FCC Statement
CE Statement (Europe)
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 in a commerical environment. This
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause
harmful interference to radio communications, in which case the user will be required to
correct the interference at their own expense.
This product complies with the European Low Voltage Directive 73/23/EEC and EMC
Directive 89/336/EEC as amended by European Directive 93/68/EEC.
CSA Statement
This Class A digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.
Information to the User
If this equipment does cause interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
■
■
■
■
Reorient the receiving antenna.
Relocate the equipment with respect to the receiver.
Move the equipment away from the receiver.
Plug the equipment into a different outlet so that equipment and receiver are
on different branch circuits.
If necessary the user should consult the dealer or an experienced radio/television
technician for additional suggestions. The user may find the following booklet prepared
by the Federal Communications Commission helpful:
How to Identify and Resolve Radio-TV Interference Problems
This booklet is available from the U.S. Government Printing Office, Washington, DC
20402, Stock No. 004-000-00345-4. In order to meet FCC emissions limits, this
equipment must be used only with cables which comply with IEEE 802.3.
85
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86
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GLOSSARY
10BASE-T
Auto-negotiation
The IEEE specification for 10 Mbps Ethernet over
Category 3, 4 or 5 twisted pair cable.
Auto-negotiation is where two devices sharing a link,
automatically configure to use the best common speed.
The order of preference (best first) is: 1000BASE-T full
duplex, 100BASE-TX full duplex, 100BASE-TX half
duplex, 10BASE-T full duplex, and 10BASE-T half duplex.
Auto-negotiation is defined in the IEEE 802.3 standard
for Ethernet and is an operation that takes place in a
few milliseconds. Auto-negotiation must be enabled for
the 1000BASE-T ports to operate at 1000 Mbps, full
duplex.
100BASE-TX
The IEEE specification for 100 Mbps Fast Ethernet over
Category 5 twisted-pair cable.
1000BASE-LX
IEEE 802.3z specification for Gigabit Ethernet over 9/125
micron core single-mode fiber cable.
Bandwidth
1000BASE-SX
The information capacity, measured in bits per second,
that a channel can transmit. The bandwidth of Ethernet
is 10 Mbps, the bandwidth of Fast Ethernet is 100
Mbps and Gigabit Ethernet is 1000 Mbps.
IEEE 802.3z specification for Gigabit Ethernet over two
strands of 50/125 or 62.5/125 micron core multimode
fiber cable.
BPDU
1000BASE-T
Bridge Protocol Data Unit. A type of information packet
that ensures that data is efficiently exchanged between
Switches in a LAN. BPDU messages detect loops in a
network, and remove them by shutting down the bridge
causing the loop.
IEEE 802.3ab specification for Gigabit Ethernet over
100-ohm Category 5, 5e or 6 twisted-pair cable (using all
four wire pairs).
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88
GLOSSARY
Category 3 Cables
Client
One of five grades of Twisted Pair (TP) cabling defined
The term used to describe the desktop PC that is
by the EIA/TIA-568 standard. Category 3 is voice grade
cable and can only be used in Ethernet networks
(10BASE-T) to transmit data at speeds of up to 10
Mbps.
connected to your network.
DHCP
Dynamic Host Configuration Protocol. This protocol
automatically assigns an IP address for every computer
on your network. Windows 95, Windows 98 and
Windows NT 4.0 contain software that assigns IP
addresses to workstations on a network. These
assignments are made by the DHCP server software that
runs on Windows NT Server.
Category 5 Cables
One of five grades of Twisted Pair (TP) cabling defined
by the EIA/TIA-568 standard. Category 5 can be used in
Ethernet (10BASE-T) and Fast Ethernet networks
(100BASE-TX) and can transmit data at speeds of up to
100 Mbps. Category 5 cabling is better to use for
network cabling than Category 3, because it supports
both Ethernet (10 Mbps) and Fast Ethernet (100 Mbps)
speeds.
Ethernet
A LAN specification developed jointly by Xerox, Intel and
Digital Equipment Corporation. Ethernet networks use
CSMA/CD to transmit packets at a rate of 10 Mbps and
100 Mbps over a variety of cables.
Category 5e Cables
One of five grades of Twisted Pair (TP) cabling defined
by the EIA/TIA-568 standard. Category 5e can be used
in Ethernet (10BASE-T), Fast Ethernet (100BASE-TX) and
Gigabit Ethernet (1000BASE-T) networks, and can
transmit data at speeds of up to 1000 Mbps.
Ethernet Address
See MAC address.
Fast Ethernet
An Ethernet system that is designed to operate at 100
Mbps.
Category 6 Cables
One of five grades of Twisted Pair (TP) cabling defined
by the EIA/TIA-568-B standard. Category 6 can be used
in Ethernet (10BASE-T), Fast Ethernet (100BASE-TX) and
Gigabit Ethernet (1000BASE-T) networks, and can
transmit data at speeds of up to 1000 Mbps.
Gigabit Ethernet
An Ethernet system that is designed to operate at 1000
Mbps.
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89
Full Duplex
IETF
A system that allows packets to be transmitted and
Internet Engineering Task Force. An organization
received at the same time and, in effect, doubles the
potential throughput of a link.
responsible for providing engineering solutions for
TCP/IP networks. In the network management area, this
group is responsible for the development of the SNMP
protocol.
Half Duplex
A system that allows packets to be transmitted and
received, but not at the same time. Half duplex is not
supported for 1000 Mbps. Contrast with full duplex.
IP
Internet Protocol. IP is a layer 3 network protocol that
is the standard for sending data through a network. IP
is part of the TCP/IP set of protocols that describe the
routing of packets to addressed devices. An IP address
consists of 32 bits divided into two or three fields: a
network number and a host number or a network
number, a subnet number, and a host number.
IEEE
Institute of Electrical and Electronics Engineers. This
American organization was founded in 1963 and sets
standards for computers and communications.
IEEE 802.1D
IP Address
Specifies a general method for the operation of MAC
bridges, including the Spanning Tree Protocol.
Internet Protocol Address. A unique identifier for a
device attached to a network using TCP/IP. The address
is written as four octets separated with periods
(full-stops), and is made up of a network section, an
optional subnet section and a host section.
IEEE 802.1Q
VLAN Tagging - Defines Ethernet frame tags which carry
VLAN information. It allows switches to assign
endstations to different virtual LANs, and defines a
standard way for VLANs to communicate across
switched networks.
ISP
Internet Service Provider. An ISP is a business that
provides connectivity to the Internet for individuals and
other businesses or organizations.
IEEE 802.3ad
A standard that defines link aggregation. 802.3ad is
now incorporated into the relevant sections of the IEEE
Std. 802.3-2002.
LAN
Local Area Network. A network of end stations (such
as PCs, printers, servers) and network devices (hubs and
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90
GLOSSARY
switches) that cover a relatively small geographic area
(usually not larger than a floor or building). LANs are
characterized by high transmission speeds over short
distances (up to 1000 metres).
purpose of exchanging information or sharing resources.
Networks vary in size, some are within a single room,
others span continents.
Ping
Layer 2
Packet Internet Groper. An Internet utility used to
determine whether a particular IP address is online. It is
used to test and debug a network by sending out a
packet and waiting for a response.
Data Link layer in the ISO 7-Layer Data Communications
Protocol. This is related directly to the hardware
interface for the network devices and passes on traffic
based on MAC addresses.
Protocol
Link Aggregation
A set of rules for communication between devices on a
See Trunking.
network. The rules dictate format, timing, sequencing
and error control.
MAC
RJ-45
Media Access Control. A protocol specified by the IEEE
for determining which devices have access to a network
at any one time.
A standard connector used to connect Ethernet
networks. The "RJ" stands for "registered jack."
MAC Address
Media Access Control Address. Also called the
hardware, physical or Ethernet address. A layer 2
address associated with a particular network device.
Most devices that connect to a LAN have a MAC
address assigned to them as they are used to identify
other devices in a network. MAC addresses are 6 bytes
long.
Network
A Network is a collection of computers and other
computer equipment that are connected for the
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91
Server
Switch
A computer in a network that is shared by multiple end
A device that interconnects several LANs to form a
single logical LAN that comprises of several LAN
segments. Switches are similar to bridges, in that they
connect LANs of a different type; however they connect
more LANs than a bridge and are generally more
sophisticated.
stations. Servers provide end stations with access to
shared network services such as computer files and
printer queues.
SFP
Small Form Factor Pluggable (SFP) Connectors are based
on an open standard that enables hot swapping of
various type of fiber optic and copper-based transceivers
into the host equipment.
TCP/IP
Transmission Control Protocol/Internet Protocol.
This is the name for two of the most well-known
protocols developed for the interconnection of
networks. Originally a UNIX standard, TCP/IP is now
supported on almost all platforms, and is the protocol
of the Internet.
Subnet Address
An extension of the IP addressing scheme that allows a
site to use a single IP network address for multiple
physical networks.
TCP relates to the content of the data travelling through
a network — ensuring that the information sent arrives
in one piece when it reaches its destination. IP relates to
the address of the end station to which data is being
sent, as well as the address of the destination network.
Subnet Mask
A subnet mask, which may be a part of the TCP/IP
information provided by your ISP, is a set of four
numbers configured like an IP address. It is used to
create IP address numbers used only within a particular
network (as opposed to valid IP address numbers
recognized by the Internet, which must assigned by
InterNIC).
Traffic Monitoring
Enables the monitoring of port traffic by attaching a
network analyzer to one switch port, in order to
monitor the traffic of other ports on the Switch.
Subnets
Trunking
A network that is a component of a larger network.
A method which specifies how to create a single
high-speed logical link that combines several
lower-speed physical links.
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92
GLOSSARY
VLAN
A Virtual LAN is a collection of network nodes that
share the same collision domain regardless of their
physical location or connection point in the network. A
VLAN serves as a logical workgroup with no physical
barriers, and allows users to share information and
resources as though located on the same LAN.
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INDEX
text, About This Guide
CSA statement 85
8
Glossary 87
Numbers
1000BASE-LX 87
1000BASE-SX 87
1000BASE-T 87
100BASE-TX 87
10BASE-T 87
H
D
half duplex 89
DHCP 88
diagram
front panel 10
Discovery 23
I
IEEE 89
A
IP address
auto configuration 33
modifying 33
IP defined 89
ISP defined 89
auto IP configuration 33
default IP address 34
default mask 34
E
Ethernet 88
B
bandwidth 87
F
Baseline Switch 2848-SFP 81
L
Fast Ethernet 88
FCC statement 85
LAN defined 89
LED issues 74
link aggregation 56
local area network 89
Feedback about this User Guide
forgotten IP address 74
forgotten password 74
front panel diagram 10
full duplex 89
8
C
category 3 cables 88
category 5 cables 88
category 5e cables 88
category 6 cables 88
client 88
M
MAC address 90
media access control 90
monitoring traffic 61, 62
configuration
G
overview 31
Gigabit Ethernet 88
conventions
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94
INDEX
connecting 23
logging on 25
menu 26
navigating 26
N
T
network analyzer 61, 62
network defined 90
TCP/IP 89
defined 91
traffic 91
requirements for accessing 23
monitoring 61, 62
troubleshooting 73
forgotten IP address 74
forgotten password 74
LED-related issues 74
POST failed 19
P
password
changing 38
default (blank) 38
setting 32
port settings
configuring 53, 63, 66
positioning the Switch 15
POST 18
U
protocol defined 90
default 38
R
resetting to factory defaults 73
RJ-45 defined 90
V
viewing
status information 31
VLANs 42
creating 49
maximum supported 42
sample configurations 47
S
server defined 91
SFP transceivers
approved (supported) 19
inserting 19
removing 20
spot checks 21
subnet mask 91
Switch
positioning 15
switch defined 91
W
Web interface
accessing directly 30
accessing using Discovery 23
buttons 29
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