3Com Switch 2226 PLUS User Manual

Baseline Switch  
2226 Plus  
User Guide  
Installationsanleitung  
3C16475CS  
Part No. 10015240 Rev. AA  
Published August 2006  
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CONTENTS  
Checking for Correct Operation 18  
Using SFP Tranceivers 19  
Approved SFP Transceivers 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  
Gigabit Combo Ports (RJ-45/SFP)  
Physical Features 10  
Front Panel 10  
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  
Port Status 29  
Accessing the Interface Without Using Discovery 30  
DHCP Assigned IP Address 30  
Manually Assigned (Static) IP Address 30  
9
9
9
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  
Supplying Power to the Switch 18  
Modifying the IP Address Settings 33  
Automatic IP Configuration 33  
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IP Setup 34  
5
TROUBLESHOOTING  
Resetting to Factory Defaults 73  
Forgotten Password 74  
Forgotten Static IP Address 74  
Solving LED Issues 74  
If the Problem Persists 76  
Backup Configuration 35  
Restore Configuration 35  
Firmware Upgrade 36  
Initialize 37  
Reboot 37  
System Access 38  
System Time 40  
SNMP 40  
Configuring VLANs 42  
VLAN 43  
A
OBTAINING SUPPORT FOR YOUR PRODUCT  
Register Your Product 77  
Purchase Value-Added Services 77  
Access Software Downloads 77  
Telephone Technical Support and Repair 78  
Contact Us 78  
Sample VLAN Configurations 47  
Spanning Tree 49  
IGMP Snooping 51  
IGMP Query 51  
Broadcast Storm 51  
Configuring Port Settings 53  
Administration 53  
B
C
TECHNICAL INFORMATION  
Related Standards 81  
Environmental 81  
Physical 81  
Speed/Duplex for 1000 Mbps Connections 55  
Link Aggregation 56  
Spanning Tree per Port 58  
Port Mirroring 61  
Electrical 81  
Statistics 62  
SAFETY INFORMATION  
Important Safety Information 83  
QoS VoIP Traffic Settings 62  
Security 65  
RADIUS Client 65  
802.1X Settings 67  
Monitoring 70  
Address Table 70  
Cable Diagnostics 70  
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GLOSSARY  
REGULATORY NOTICES  
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 2226 Plus User Guide  
Press Ctrl+Alt+Del  
Part number: 10015240  
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 2226 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 2226 Plus is a versatile,  
easy-to-use unmanaged 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.  
Gigabit Combo Ports (RJ-45/SFP)  
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.  
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10  
INTRODUCING THE BASELINE SWITCH  
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.  
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.  
Physical Features  
Figure 1 shows the front and rear panels of the Switch.  
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  
téléphonique central privé ou public. Raccorder  
seulement connecteurs de données RJ-45, systèmes de  
réseaux de téléphonie ou téléphones de réseaux à ces  
prises.  
The numbers in this diagram refer to numbered sections  
in “Front Panel” on page 10 and “Rear Panel” on  
page 13.  
Figure 1 Front and Rear Panels  
Il est possible de raccorder des câbles protégés ou non  
protégés avec des jacks protégés ou non protégés à ces  
prises de données.  
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.  
Front Panel  
The front panel of the Switch contains a series of  
indicator lights (LEDs) that help describe the state of  
various networking and connection operations.  
(1) RJ-45 10/100 Ports  
The Switch has 24 10/100 Mbps auto-negotiating ports.  
Each port supports automatic MDI/MDI-X detection and  
WARNING: RJ-45 Ports. These are shielded RJ-45 data  
sockets. They cannot be used as standard traditional  
telephone sockets, or to connect the unit to a  
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Physical Features  
11  
can be connected to either a 10BASE-T, or 100BASE-TX  
device.  
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.  
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 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.  
CAUTION: The Switch supports full duplex  
auto-negotiation. If auto-negotiation is disabled for  
1000BASE-T, then the Switch uses the forced-mode  
default of 100 full duplex mode. If the connected device  
does not support auto-negotiation, the Switch will  
operate in half duplex mode (even if the attached device  
is operating in full duplex mode). In such a  
configuration, you may notice some degradation of  
network performance. 3Com recommends that you use  
devices that are capable of auto-negotiation (and that  
you ensure that auto-negotiation is enabled, if it is a  
configurable option).  
(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:  
10/100/1000BASE-T Ports  
Status Meaning  
Green  
Yellow  
The link is operating at 1000 Mbps.  
(2) Gigabit Combo Ports (RJ-45/SFP)  
The link is operating at 10 or 100 Mbps.  
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.  
Flashing Packets are being received or transmitted on the  
Green port at 1000 Mbps.  
Flashing Packets are being received or transmitted on the  
Yellow port at 10 or 100 Mbps.  
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  
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12  
INTRODUCING THE BASELINE SWITCH  
Off  
The link has not been established, either nothing  
is connected to the port, or there is a problem:  
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.  
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.  
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.  
10/100BASE-TX Ports  
Status Meaning  
(4) Duplex Status LEDs  
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:  
Green  
Yellow  
The link is operating at 100 Mbps.  
The link is operating at 10 Mbps.  
Flashing Packets are being received or transmitted on the  
Green port at 100 Mbps.  
10/100/1000BASE-T Ports  
Status Meaning  
Flashing Packets are being received or transmitted on the  
Yellow port at 10 Mbps.  
Yellow  
Off  
The port is operating in full duplex mode.  
The port is operating in half duplex mode.  
1000BASE-T only operates in full duplex mode.  
10/100BASE-TX can be in half or full duplex mode.  
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Physical Features  
13  
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 Supply  
The Switch automatically adjusts to the supply voltage.  
Only use the power cord that is supplied with the unit.  
(5) Power LED  
The Power LED shows the power status of the Switch.  
(8) Recovery Button  
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.  
Status Meaning  
Green  
Yellow  
The unit is powered on and ready for use.  
Internal power, POST, or loopback test has  
failed. Switch is in fail-safe mode.  
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.  
Off  
The unit is not receiving power.  
Check that the power cord is connected cor-  
rectly.  
If the unit still does not operate, contact your  
supplier.  
(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.  
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.  
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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  
Switch hinzufuegen oder Instandhaltungsarbeiten  
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 Supply” 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 “(5)  
Power LED” 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
Hold the transceiver so that the fiber connector is  
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 operating by listening to the unit. The 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  
on 3Com Baseline Switch 2226 Plus  
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 2226 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  
Discovered Devices screen displays detected  
network 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  
Baseline Switch 2226 Plus, and then click Next.  
The Completing the 3Com Discovery  
Application 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 Switchs configuration.  
Manages the device.  
Device  
VLAN  
Configures the device.  
Allows you to setup, modify, or view  
the IP configuration parameters.  
Contains tabs that allow you to:  
Create a VLAN.  
Backup  
Configuration  
Allows you to backup the Switchs  
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  
Allows you to enable or disable IGMP  
snooping.  
Port Mirroring  
Monitor traffic going in and out of  
ports.  
IGMP Query  
Allows you to enable or disable IGMP  
query mode.  
Statistics  
QoS  
Display statistics for a selected port.  
Configures QoS settings.  
Broadcast Storm  
Allows you to enable or disable rate  
limiting.  
VoIP Traffic Setting Contains tabs that allow you to:  
Display Voice VLAN summary.  
Port  
Configures the ports.  
Configure Voice VLAN global  
settings.  
Administration  
Contains tabs that allow you to:  
Display selected port information for  
the entire Switch.  
Configure Voice VLAN port settings.  
Display port information for Voice  
VLAN and Trunk details.  
Display individual port information.  
Modify the port settings.  
Display OUI summary.  
Add or remove OUI.  
Link Aggregation  
Contains tabs that allow you to:  
Display link aggregation summary.  
Create an aggregation group.  
Modify the port memberships.  
Remove an aggregation group.  
Security  
Radius Client  
Configures security settings.  
Contains tabs that allow you to:  
Display Radius Client information.  
Configure Radius Client settings and  
set authentication parameters.  
Spanning Tree per Contains tabs that allow you to:  
Port  
Display selected spanning tree  
information for every port.  
Display individual port spanning tree  
information.  
Modify the spanning tree settings  
for a port.  
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Navigating the Web Interface  
29  
Buttons  
Depending on the screen that is currently  
Menu Item  
Description  
802.1X Settings  
Contains tabs that allow you to:  
displayed, the following buttons may appear:  
Display system authentication  
summary.  
Apply – Click to save and apply any changes  
Display detailed information per  
port.  
that you have made  
Cancel – Click to discard any unsaved  
Configure system authentication  
settings.  
changes  
Monitoring  
Display Switch monitoring information.  
Help – Click to display the context-sensitive  
help information for the screen that is  
currently displayed. The help pages provide  
information on the tasks that you can  
perform on each screen.  
Address Table  
Displays MAC address table  
information for ports and VLANs.  
Cable Diagnostics  
Contains tabs that allow you to:  
Display selected cable diagnostics  
information for all ports.  
Port Status  
Display all cable diagnostics  
information for a single port.  
There is an image of the Switchs front panel in  
the Device View page, which indicates ports  
that are currently in use.  
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.  
To configure a port, click the port on the image  
for the these following configuration options:  
View detailed port information  
Configure the port settings  
View port statistics  
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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 Switchs 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  
browser, and then type http://192.168.0.123.  
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 Switchs 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 Switchs 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 Switchs  
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  
If you request for technical assistance from  
3Com Support, you may be asked to print out  
the information on this screen.  
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.  
Polling Interval  
Enter the interval in seconds you would like the  
Switch to refresh. (Range: 10 to 180 seconds; 0  
to disable polling).  
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.  
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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 Switchs  
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 users 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  
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.  
For examples on setting up VLANs, refer to  
“Sample VLAN Configurations”.  
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  
1 Enter a set of VLANs or select all VLANs to add  
to the remove list, then click Select.  
VLAN Detail  
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.  
Ports 1, 3, and 26 now belong to VLAN2, and  
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  
2 On Switch 1, set the ports that you want to be  
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 networks 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  
Switchs 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.  
The settings include:  
Status – Enables and disables broadcast  
storm control.  
Packet Rate Threshold – Sets the broadcast  
storm threshold (64 to 1000000 kilobits per  
second).  
Figure 36 Broadcast Storm Setup Screen  
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Configuring Port Settings  
53  
Summary  
Configuring Port Settings  
Use the Summary tab to display Port State,  
Flow Control, Speed, Default VLAN ID, Link  
Type, or Duplex for all the ports.  
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.  
Figure 37 Port Administration Summary Screen  
The Port menu includes five items:  
Administration  
Link Aggregation  
Spanning Tree per Port  
Port Mirroring  
Statistics  
Administration  
Three tabs are available on the Port  
Administration page:  
Summary  
Detail  
Setup  
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CHAPTER 4: CONFIGURING THE SWITCH  
Detail  
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.  
Use the Detail tab to display detailed port  
setting information for a port.  
Figure 38 Port Administration Detail 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.  
Setup  
Use the Setup tab to configure the port  
settings. The following options are available:  
Duplex – Sets the duplex mode of the port.  
Available options include auto, half, and full.  
Port State – Enables and disables the port.  
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.  
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Configuring Port Settings  
55  
If you modify any of these settings, click Apply  
to save your changes.  
1000 Mbps connections are always full-duplex.  
Half-duplex connections are only available for  
10 Mbps and 100 Mbps settings.  
Figure 39 Port Administration Setup Screen  
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.  
You cannot modify the speed/duplex settings of  
ports that are members of a trunk or  
aggregated link.  
Speed/Duplex for 1000 Mbps Connections  
You cannot preset the speed to 1000 Mbps. To  
run a port at 1000 Mbps, you must enable  
autonegotiation for the port. When  
autonegotiation is enabled, the Switch will  
automatically connect at 1000 Mbps, providing  
the connected device also supports this speed.  
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.  
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CHAPTER 4: CONFIGURING THE SWITCH  
All ports in a trunk must be configured in an  
identical manner, including communication  
mode (that is, speed, duplex mode and flow  
control).  
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.  
Four tabs are available on the Port Link  
Aggregation page:  
Summary  
Create  
Modify  
Remove  
For link aggregation to work, the trunks must  
be configured on both ends (switches).  
Guidelines for Creating Trunks  
Summary  
Any port on the Switch can be used for  
Use the Summary tab to display Group ID, Port  
members, and Link Type for a list of link  
aggregate groups.  
creating a trunk.  
This switch supports a maximum of four  
trunks.  
Each trunk may contain up to four  
members.  
A port may only be a member of one trunk  
at any one time.  
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Configuring Port Settings  
57  
Figure 40 Link Aggregation Summary Screen  
To create a new link aggregation group:  
1 Enter a link aggregation group ID in the box  
field.  
2 Select the ports to add to the goup.  
3 Click Apply.  
Modify  
Create  
Use the Modify tab reassign port members to a  
link aggregation group.  
Use the Create tab to add ports to a group  
membership.  
Figure 42 Link Aggregation Modify Screen  
Figure 41 Link Aggregation Create Screen  
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CHAPTER 4: CONFIGURING THE SWITCH  
To modify a link aggregation group:  
Spanning Tree per Port  
This administrative tool supports the  
1 Select the aggregation group to modify, then  
click Select.  
configuration of the Switch to forward, or  
block and discard 802.1D spanning tree BPDU  
packets.  
2 Select the ports to add to the goup.  
3 Click Apply.  
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  
Remove  
Use the Remove tab delete a link aggregation  
group.  
tree-compliant networked devices by:  
Figure 43 Link Aggregation Remove Screen  
Disabling redundant paths when the main  
paths are operational.  
Enabling redundant paths if the main paths  
fail.  
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  
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  
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.  
Summary  
Use the Summary tab to display Status, Edged  
Port, Link Type, Path Cost, State, or Port Priority  
for all the ports.  
Figure 44 Spanning Tree Summary Screen  
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.  
Three tabs are available on the Spanning Tree  
per Port page:  
Summary  
Detail  
Setup  
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CHAPTER 4: CONFIGURING THE SWITCH  
Detail  
Link Type – Choose between Point-to-Point,  
Shared, or Auto for the link type.  
Use the Detail tab to display detailed spanning  
tree information for a port.  
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.  
Figure 45 Spanning Tree Detail Screen  
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.  
If you modify any of these settings, click Apply  
to save your changes.  
Setup  
Use the Setup tab to configure the spanning  
tree settings for each port. The following  
options are available:  
Figure 46 Spanning Tree Setup Screen  
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  
Figure 47 Port Mirroring Setup Screen  
Port Mirroring  
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.  
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.  
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.  
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.  
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.  
5 Under Mirror Type, select to monitor incoming  
traffic, outgoing traffic, or both.  
6 Click Apply.  
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CHAPTER 4: CONFIGURING THE SWITCH  
3 Click Apply.  
Statistics  
The Switch allows you to statistics of a  
particular port.  
QoS VoIP Traffic Settings  
Figure 48 Port Statistics Screen  
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  
To display statistics for a port:  
1 Access the Web interface. Click Port, then  
Statistics on the menu. The Port Statistics  
Screen appears.  
2 Select the a port, and enter a refresh interval.  
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QoS VoIP Traffic Settings  
63  
Summary  
You must first create a VLAN from the VLAN  
Setup page before you can assign and  
configure a Voice VLAN.  
Use the Summary tab to display the global  
settings for Voice VLAN.  
Figure 50 QoS VoIP Setup Screen  
Figure 49 QoS VoIP Summary Screen  
Port Setup  
Use the Port Setup tab to configure the port or  
trunk setting for Voice VLAN. The following  
options are available:  
Setup  
Use the Setup tab to configure the global  
settings 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  
Voice VLAN Status – Enable or disable Voice  
the security.  
VLAN for the switch.  
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  
Figure 52 QoS Port Detail Screen  
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  
settings to.  
3 Click Apply.  
Figure 51 QoS Port Setup Screen  
OUI Summary  
Use the OUI Summary tab to display the list of  
Organizational Unique Identifier for a company  
and their description.  
Figure 53 QoS OUI Summary Screen  
Port Detail  
Use the Port Detail tab to display the Voice  
VLAN information for selected ports.  
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Security  
65  
Figure 54 QoS OUI Modify Screen  
OUI Modify  
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.  
Description – Input a description for the new  
company identifier.  
To add to the OUI list:  
1 Enter a Telephony OUI and description.  
2 Click Add.  
Security  
To remove an OUI from the list:  
Using the Web interface, you can configure the  
RADIUS Client and 802.1X settings.  
1 Select a Telephony OUI from the list.  
2 Click Remove.  
The Security menu includes two items:  
RADIUS Client  
802.1X Settings  
RADIUS Client  
Remote Authentication Dial-in User Service  
(RADIUS) is a logon authentication protocol  
that uses software running on a central server  
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66  
CHAPTER 4: CONFIGURING THE SWITCH  
Figure 55 RADIUS Client Detail Screen  
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.  
The RADIUS Client menu includes two tabs:  
Detail  
Configure  
Detail  
Use the Detail tab to display the RADIUS Client  
settings.  
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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Security  
67  
UDP port – The RADIUS server UDP port  
802.1X Settings  
used for authentication messages.  
The IEEE 802.1X (dot1x) standard defines a  
port-based access control procedure that  
Key – Sets the RADIUS encryption key.  
prevents unauthorized access to a network by  
requiring users to first submit credentials for  
authentication.  
After you have filled in the parameters, click  
Apply to save your changes.  
The 802.1X settings menu includes three tabs:  
Figure 56 RADIUS Client Configure Screen  
Summary  
Detail  
Setup  
Summary  
Use the Summary tab to display the 802.1X  
authentication settings.  
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CHAPTER 4: CONFIGURING THE SWITCH  
Figure 57 802.1X Summary Screen  
Figure 58 802.1X Detail Screen  
Setup  
Use the Setup tab to configure the 802.1X  
authenticaion settings. The following fields are  
available:  
Detail  
System Authentication – Sets the global  
Use the Detail tab to display detailed 802.1X  
authentication information for a port..  
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)  
Mode – Sets the authentication mode to  
one of the following options:  
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Security  
69  
Auto – Requires a dot1x-aware client to  
be authorized by the authentication  
server. Clients that are not dot1x-aware  
will be denied access.  
Reauthentication Period – Sets the time  
period after which a connected client must  
be re-authenticated. (Range: 1-65535  
seconds; Default: 3600 seconds)  
Force-Authorized – Forces the port to  
grant access to all clients, either  
dot1x-aware or otherwise.  
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)  
Force-Unauthorized – Forces the port to  
deny access to all clients, either  
dot1x-aware or otherwise.  
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)  
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)  
After you have filled in the parameters, click  
Apply to save your changes.  
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)  
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)  
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CHAPTER 4: CONFIGURING THE SWITCH  
Figure 59 802.1X Setup Screen  
Figure 60 Address Table Screen  
Monitoring  
Using the Web interface, you can display  
address table information and cable  
diagnostics.  
Cable Diagnostics  
The Switch provides cable diagnostic, which  
helps you detect and resolve issues with the  
attached cables.  
The Monitoring menu includes two items:  
Address Table  
The Cable Diagnostics menu includes two tabs:  
Cable Diagnostics  
Summary  
Address Table  
Diagnostics  
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 Cable Diagnostic 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 61 Cable Diagnostic Summary Screen  
Diagnostics  
Use the Diagnostics tab to display individual  
port information on Test Result, Cable Fault  
Distance, and Last Update.  
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72  
CHAPTER 4: CONFIGURING THE SWITCH  
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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  
after you set it, you will need to reset the  
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.  
Professional Services is available at www.3com.com.  
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  
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  
3Com Web site at http://eSupport.3com.com/.  
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  
at http://eSupport.3com.com/, or under the  
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 senders  
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  
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  
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 2226 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  
47-63 Hz (+/- 3 Hz)  
100–240 VAC (auto range)  
2 Amp (maximum)  
60 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  
286.7 BTU/hr  
Maximum Power  
Dissipation  
Environmental  
0-45 °C (32–113 °F)  
Operating Tempera-  
ture  
-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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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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86  
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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87  
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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88  
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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89  
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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90  
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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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.  
91  
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92  
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INDEX  
text, About This Guide  
CSA statement 91  
8
Glossary 85  
Numbers  
1000BASE-LX 85  
1000BASE-SX 85  
1000BASE-T 85  
100BASE-TX 85  
10BASE-T 85  
H
D
half duplex 87  
DHCP 86  
diagram  
front panel 10  
Discovery 23  
I
IEEE 87  
A
IP address  
auto configuration 33  
modifying 33  
IP defined 87  
ISP defined 87  
auto IP configuration 33  
default IP address 34  
default mask 34  
E
Ethernet 86  
B
bandwidth 85  
F
Baseline Switch 2848-SFP 81  
L
Fast Ethernet 86  
FCC statement 91  
LAN defined 87  
LED issues 74  
link aggregation 56  
local area network 87  
Feedback about this User Guide  
forgotten IP address 74  
forgotten password 74  
front panel diagram 10  
full duplex 87  
8
C
category 3 cables 86  
category 5 cables 86  
category 5e cables 86  
category 6 cables 86  
client 86  
M
MAC address 88  
media access control 88  
monitoring traffic 61, 62  
configuration  
G
overview 31  
Gigabit Ethernet 86  
conventions  
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94  
INDEX  
connecting 23  
logging on 25  
menu 26  
navigating 26  
N
T
network analyzer 61, 62  
network defined 88  
TCP/IP 87  
defined 89  
technical specifications 81  
traffic 89  
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  
trunking See link aggregation  
configuring 53, 62, 65  
positioning the Switch 15  
POST 18  
U
protocol defined 88  
default 38  
R
resetting to factory defaults 73  
RJ-45 defined 88  
V
viewing  
status information 31  
VLANs 42  
creating 49  
maximum supported 42  
sample configurations 47  
S
server defined 89  
SFP transceivers  
approved (supported) 19  
inserting 19  
removing 20  
spot checks 21  
subnet mask 89  
Switch  
positioning 15  
switch defined 89  
W
Web interface  
accessing directly 30  
accessing using Discovery 23  
buttons 29  
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