D-Link DFE-2616i, DFE-2616ix, DFE-2616x, DFE-2624i, DFE-2624ix User Manual

DFE-2600 Series

Ethernet/Fast Ethernet

Dual-Speed

Managed/Unmanaged

Stackable Hubs

User Guide

Rev. 03 (December, 1998)

6DFE2600M.03

Printed In Taiwan

RECYCLABLE

ii

Trademarks

Copyright 1998 D-Link Corporation.
Contents subject to change without prior notice.
D-Link is a registered trademark of D-Link Corporation/D-Link Systems, Inc.

All other trademarks belong to their respective proprietors.

Copyright Statement

No part of this publication may be reproduced in any form or by any means or
used to make any derivative such as translation, transformation, or adaptation
without permission from D-Link Corporation/D-Link Systems Inc., as stipu­lated by the United States Copyright Act of 1976.

iii

Wichtige Sicherheitshinweise

1. Bitte lesen Sie sich diese Hinweise sorgftig durch.

2. Heben Sie diese Anleitung f den spern Gebrauch auf.

3. Vor jedem Reinigen ist da s Ger vom Stromnetz zu trennen. Vervenden Sie keine Fl sig- oder
Aeros o lreiniger. Am besten d ient ein angefeuchtetes Tuch z ur Reinigung.

4. Um eine Beschigung des G eres zu vermeiden sollten Sie nur Zubehteile ve rwende n, die vom
Hersteller zuge lassen sind.

5. Das Ger is vor Fe uchtigkeit zu sch zen.

6. Bei der Aufstellung des Geres ist auf sichern Stand zu achten. Ein Kippen oder Fallen knte
Verletzungen hervorrufen. V erwenden Sie nur sichere St andorte und beachten Sie die Aufstellhinweise des

Herstellers.

7. Die Bel tungsfnungen dienen zur Luftzirkulation die d as Ger vor erhitzung sch zt. Sorgen Sie
daf , daß diese fnungen nicht abgedec kt werd en.

8. Beachten Sie beim Anschluß an das Stromnetz die Anschluerte.

9. Die Netzanschluteckdose muß aus Gr den der elektrischen Sicherheit einen Schutzleiterkontakt haben.

10. Verlegen Sie die Netzanschlueitung so , daß niemand dar er fallen kann. Es sollete auch nichts auf der
Leitung abgestellt werde n.

11. Alle Hinweise und Warnungen die s ich am Geren befinden sind zu beachten.

12. Wird das Ger er einen lgeren Zeitraum nicht benutzt, sollten Sie es vom Stromnetz trennen. Somit
wird im Falle einer erspannung eine Bes chigung vermiede n.

13. Durch die L tungsfnungen d fen niemals Gegenstde oder Fl sigkeiten in das Ger gelangen.
Dies knte einen Brand bzw. Elektrischen Schlag auslen.

14.



fnen Sie niemals das Ger. Das Ger darf aus Gr den der elektrischen Sicherheit nur von

authorisiertem Servicepersonal gefnet werden.

15. Wenn folge nde Situationen auftreten is t das G er vom Stromnet z zu tre nnen und von eine r qualifizierten
Servicestelle zu erpr en:

a– Netzkabel oder Netzstecker sint beschigt.
b– Fl sigkeit ist in das Ger eingedrungen.
c– Das Ger war Feuchtigkeit ausgesetzt.
d– Wenn da s Ger nicht der Bedienungs anleitung ens prechend funktioniert oder S ie mit Hilfe dieser

Anleitung ke ine Verbesse r ung erziele n.

e– Das Ger ist gefa llen und/oder das Gehse ist beschigt.
f– Wenn da s Ger deutliche Anzeichen eines Defektes aufweist.

16. Bei Reparatur en d fen nur Orginalersatzteile bzw. den Orginalteilen entsprechende Teile ver wendet
werden. Der E insatz von ungeeignete n E r satzt eilen kann e ine weite r e Beschigung hervorrufen.

17. Wenden Sie sich mit allen Fragen die Service und Repartur betreffen an Ihren Servicepartner. Somit
stellen Sie die Betriebssicherheit des Geres sicher.

iv

Limited Warranty

Hardware:

D-Link wa r rants its hardware pro ducts to be free from defects in workmanship and mat erials, under normal use
and service, for the following periods measured from date of purchase from D-Link or its Authorized Reseller:

Product Type Warranty Period
Complete products One year
Spare parts and spare kits 90 days

The one-year period of warranty on complete products applies on condition that the product's Registration Card
is filled out and returned to a D- Link office within ninety (90) days of purcha se. A lis t of D-Link o ffices is
provided at the back of this manual, together with a copy of the Registration Card. Failing such timely registra­tion of purchase, the warranty period shall be limited to 90 days.

If the pr oduct proves d efective within the a pplicab le warranty period, D-Link will provide repa ir or replacement
of the product. D-Link shall have the sole discretion whether to repair or replace, and replacement product may
be new or reconditioned. Replacement product shall be of equivalent or better specifications, relative to the
defective product, but need not be identical. Any product or part repaired by D-Link pursuant to this warranty
shall have a warranty period of not less than 90 days, from date of such repair, irrespective of any earlier expi­ration of original warranty period. When D-Link provides replacement, then the defective product becomes the
property of D-Link.

Warranty service may be obtained by contacting a D-Link office within the applicable warranty period, and
requesting a Return Material Authorization (RMA) number. If a Registration Card for the product in question
has not been returned to D-Link, then a proof of purchase (such as a copy of the dated purchase invoice) must
be provided. If Purchaser's circumstances require special handling of warranty correction, then at the time of
requesting RMA number, Purchaser may also propose special procedure as may be suitable to the case.

After an RMA number is issued, the defective product must be packaged securely in the original or other
suitab le shipping packa ge to ensure that it will not b e damaged in transit, and t he RMA number must be p r omi­nently marked on the outside of the package. The package must be mailed or otherwise shipped to D-Link with
all costs of mailing/shipping/insurance prepa id ; D-Link will o rdinarily re imburse Purchaser for mail­ing/shipping/insurance expenses incurred for return of defective product in accordance with this warranty.
D-Link shall never be responsible for any software, firmware, information, or memory data of Purchaser con­tained in, stored on, or integrated with any product returned to D-Link pursuant to this warranty.

Any pack age retur ned to D- Link without an RMA number will be reje cted a nd shippe d back to Purchaser at
Purchaser's expense, and D-Link reserves the right in such a case to levy a reasonable handling charge in addi­tion mailing or shipping costs.

Software:

Warranty service for software products may be obtained by contacting a D-Link office within the applicable
warranty period. A list of D-Link offices is provided at the back of this manual, together with a copy of the
Registration Card. If a Registration Card for the product in question has not been returned to a D-Link office,
then a proof of purchase (such as a copy of the dated purchase invoice) must be provided when requesting
warranty service. The term "purchase" in this software warranty refers to the purchase transaction and resulting
license to use such software.

D-Link warrants that it s software p roducts will perform in subs tantial conformance with the applic able pr oduct
documentation provided by D-Link with such software product, for a period of ninety (90) days from the date of
purcha se from D-Link or its Authorized Reseller. D-Link warrants the magnetic media , on which D-Link
provides its software product, against failure during the same warranty period. This warranty applies to pur-

v

chased software, and to replacement software provided by D-Link pursuant to this warranty, but shall not apply
to any update or replacement which may be provided for download via the Internet, or to any update which may
otherwise be provided free of charge.

D-Link's sole obligation under this software warranty shall be to replace any defective software product with
product which substantially conforms to D-Link's applicable product documentation. Purchaser assumes re­sponsibility for the selection o f appropriate application and syste m/platform s oftware and associated r eference
materia ls. D-Link makes no warrant y that its softwa re prod ucts will work in combination with any hardware, or
any application or system/platform software product provided by any third party, excepting only such products
as are expressly represented, in D-Link's applicable product documentation as being compatible. D-Link's
obligation under this warranty shall be a re asonab le effort to provide compa tibility, but D-Link shall have no
obligat ion to provide co mpatibility w hen there is fault in t he third-party hardware or software. D-Link makes no
warranty that operation of its softwa re prod u cts will b e uninterrup ted or absolut ely error - fr ee, a nd no warr anty
that all defects in the software product, within or without the scope of D-Link's applicable product documenta­tion, will be co rrected.

D-Link Offices for Registration and Warranty Service

The product's Registration Card, included at the back of this manual, must be completed and sent to a D-Link
office. To obtain an RMA number for warranty service on a hardware product, or software product, contact the
D-Link office nearest you. An address / telephone / fax contact list of international D-Link offices is provided at
the back of this manual.

LIMITATION OF WARRANTIES

IF THE D-LINK PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, THE CUSTOMER'S
SOLE REMEDY SHALL BE, AT D-LINK'S OPTION, REPAIR OR REPLACEMENT. THE FOREGOING
WARRANTIES AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER
WARRANTIES, EXPRESSED OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW,
STATUTORY OR OTHERWISE, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. D-LINK NEITHER ASSUMES NOR AUTHORIZES ANY OTHER
PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE,
INSTALLATION MAINTENANCE OR USE OF D-LINK'S PRODUCTS
D-LINK SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION
DISCLOSE THAT THE ALLEGED DEFECT IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED
BY THE CUSTOMER'S OR ANY THIRD PERSON'S MISUSE, NEGLECT, IMPROPER INSTALLATION
OR TESTING, UNAUTHORIZED ATTEMPTS TO REPAIR, OR ANY OTHER CAUSE BEYOND THE
RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE, LIGHTNING OR OTHER HAZARD.

vi

LIMITATION OF LIABILITY

IN NO EVENT WILL D-LINK BE LIABLE FOR ANY DAMAGES, INCLUDING LOSS OF DATA, LOSS
OF PROFITS, COST OF COVER OR OTHER INCIDENTAL, CONSEQUENTIAL OR INDIRECT
DAMAGES ARISING OUT THE INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE
OR INTERRUPTION OF A D- LINK PRODUCT, HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY. THIS LIMITATION WILL APPLY EVEN IF D-LINK HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
IF YOU PURCHASED A D-LINK PRODUCT IN THE UNITED STATES, SOME STATES DO NOT
ALLOW THE LIMITATION OR EXCLUSION OF LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL
DAMAGES, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.

FCC Warning

This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when
the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with this user guide, may cause harmful interfer­ence to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user will be re­quired to correct the interference at his own expense.

CE Mark Warning

This is a Class A product. In a domestic environment, this product may cause
radio interference in which case the user may be required to take adequate
measures.

VCCI A Warning

About This Guide vii

T

ABLE OF

C

ONTENTS

0 A

BOUT THIS GUIDE

.........................................................

XI

Models Covered........................................................................................xi

Conventions..............................................................................................xi

Overview of the User Guide ................................................................xii

1 I

NTRODUCTION

.................................................................1

Product Description..................................................................................1

Product Features.......................................................................................2

Dual-Speed Ethernet Hub Technology Overview......................................4

2 U

NPACKING AND SETUP

....................................................6

Unpacking .................................................................................................6

Identifying External Components..............................................................7

Front Panel..........................................................................................................7

Rear Panel...........................................................................................................9

Installing the Hub....................................................................................10

Installation ........................................................................................................10

Rack Mounting..................................................................................................11

Replacing the Power Supply....................................................................12

3 U

NDERSTANDING INDICATORS

.........................................15

Hub State Indicators................................................................................16

Dual-Speed Stackable Hubs User’s Guide

viii

Module Indicators...................................................................................17

Port State Indicators ...............................................................................18

SNMP Indicator.......................................................................................19

Port Speed Indicators..............................................................................19

Console Port Indicator (CON) ................................................................19

4 M

AKING CONNECTIONS

...................................................21

Hub Cascading/Building a Stack.............................................................21

Connectivity Rules...................................................................................23

The Diagnostic Port ................................................................................24

Diagnostic Port Connection..............................................................................24

Hub to End-Station Connection ..............................................................25

Hub-to-Hub Uplink..................................................................................27

Optional Module Connections.................................................................29

Module Installation...........................................................................................30

Switch Module (DFE-260S).............................................................................31

Fiber Optic Module (DFE-260FX)...................................................................31

Fast Ethernet Module (DFE-260TX)................................................................32

5 M

ASTER HUB SETUP AND MANAGEMENT

..........................35

Navigation and Conventions...................................................................36

In-Band Setup Instructions......................................................................37

Backup Master Function.........................................................................38

Segmenting Hubs.....................................................................................39

Logging in to the Hub Console................................................................41

Logging In.........................................................................................................41

Changing Your Password..................................................................................43

Setting Up the Master Hub......................................................................45

TCP/IP Settings.................................................................................................45

ix

Out-of-Band Management and Console Settings..............................................47

Software Update on Boot..................................................................................48

SNMP Information............................................................................................49

SNMP Traps .....................................................................................................51

SNMP Security (Community Names)...............................................................52

Adding and Deleting Users...............................................................................53

Primary/Backup Master.....................................................................................55

Hub Stack Management...........................................................................56

Controlling Hubs in the Hub Stack...................................................................56

Controlling Individual Ports .............................................................................59

Monitoring the Hub Stack .......................................................................60

Displaying Port and Group Statistics................................................................61

Displaying Segment Statistics...........................................................................64

Node Tracking...................................................................................................66

Per-Port Intrusion Security ...............................................................................67

Bridge Information............................................................................................67

Resetting the Hub ....................................................................................68

System Reset.....................................................................................................69

Factory Reset.....................................................................................................69

6 WEB-B

ASED NETWORK MANAGEMENT

............................71

Introduction.............................................................................................71

Getting Started ........................................................................................72

Management............................................................................................72

Configuration....................................................................................................73

Performance......................................................................................................79

Fault..................................................................................................................82

User...................................................................................................................89

RMON ..............................................................................................................92

7 C

ABLES AND CONNECTORS

...........................................111

100BASE-TX Ethernet Cable and Connectors......................................111

Crossover Cables...................................................................................112

RS-232 (DB9) Pin Specification.....................................................................113

Dual-Speed Stackable Hubs User’s Guide

x

8 S

PECIFICATIONS

...........................................................119

General..................................................................................................119

Hub-to-Hub Cascading .........................................................................120

LED Indicators......................................................................................120

Environmental and Physical..................................................................120

9 G

LOSSARY

...................................................................123

About This Guide xi

0 A

BOUT

T

HIS

G

UIDE

This guide discusses how to install and use the DFE-2600 series dual-speed,
managed/unmanaged, stackable Ethernet/Fast Ethernet Hubs.

Models Covered

Unmanaged Models

: DFE-2616, DFE-2616x, DFE-2624, DFE-2624x.

Managed Models

: DFE-2616i, DFE-2616ix, DFE-2624i, DFE-2624ix.

All ” models include a switch module in Slot 1 of the rear panel. All ”
models are intelligent (that is, anaged”) hubs capable of managing an entire
hub stack. All x” models have both features.

The model numbers also indicate how many ports a partic ular hub has, thus:
2616 hubs have 16 ports and 2624 hubs have 24 ports.

Conventions

References in this manual to the DFE-2616, DFE-2616x, DFE-2624, DFE­2624x; DFE-2616i, DFE-2616ix, DFE-2624i, and DFE-2624ix hubs are fre­quently written simply as ub” or ubs” where the text applies to all

models. Model numbers are normally used only to differentiate between
them where necessary.

At points in this document, master models are differentiated by referring to,

FE-2600 series master hubs.”

Dual-Speed Stackable Hubs User’s Guide

About This Guidexii

Unless differentiated by model number or other specific reference, all infor­mation applies to all models.

Overview of the User Guide

♦

Chapter 1,

Introduction

. Provides information on Fast Ethernet net-

works, and introduces the features of the DFE-2600 series hubs.

♦

Chapter 2,

Unpacking and Setup

. Helps you get started in setting up

the hub.

♦

Chapter 3,

Understanding Indicators

. Describes all LED indicators

on the hub front panel. Understanding these indicato rs is essential
to effectively using the hub.

♦

Chapter 4,

Making Connections

. Provides information on connecting

to the hub twisted-pair and console po rts, stacking hub s, and linking
with other 100BASE-TX hubs.

♦

Chapter 5,

Master Hub Setup and Management

. Provides information
on using the management agent built into master models in the 2600
series.

♦

Chapter 6,

Web-based Network Management.

Provides detailed in-

formation on managing the network thro ugh an internet browser.

♦

Appendix A,

Cables and Connectors

. Provides specifications on the

cables and connectors used with the hubs.

♦

Appendix B,

Boot Configuration File

. Describes the DFE-2600 series

master hub boot configuration file.

♦

Appendix C,

Specifications

. Lists the hubs’ specifications.

♦

Appendix D,

Glossary

. Provides the meaning for some networking

terms used in this manual.

Introduction 1

1

1 I

NTRODUCTION

This chapter introduces the DFE-2600 series dual-speed stackable hubs, as
well as giving some background information about the technology the hubs
use.

Product Description

The D-Link DFE-2600 series dual-speed stackable Ethernet/Fast Ethernet
hubs are designed to allow easy migration and integration between 10Mbps
Ethernet and 100Mbps Fast Ethernet, while providing manageability and
flexibility in cable connections.

The DFE-2600 hubs can operate with either IEEE 802.3 10BASE-T connec­tions (twisted-pair Ethernet operating at 10 megabits per second), or IEEE

802.3u 100BASE-TX connections (twisted-pair Fast Ethernet operating at
100 megabits per second). All of the twisted-pair ports support NWay auto­negotiation, allowing the hub to automatically detect the speed o f a network
connection. This means you can connect all of your Ethernet and Fast Ether­net hosts to a DFE-2600 series hub stack, without any rewiring required when
a host is upgraded from 10Mbps to 100Mbps.

The DFE-2600 series hubs, available in 16-port and 24-port models, can be
stacked with up to five hub s in a stack. A sta ck of five 24 -port hubs give s a
total of 120 Ethernet or Fast Ethernet ports. A DFE-2600 series hub stack
operates as a Class II Fast Ethernet repeater, allowing it to be linked to
another Class II Fast Ethernet stack in the same collision domain.

Dual-Speed Stackable Hubs User’s Guide

Introduction2

In the basic configuration, the 10Mbps and 100Mbps segments are separate
and do not intercommunicate. An optional DFE-260S switch module (in­cluded with the DFE-2616x, DFE-2624x, DFE-2616ix, and DFE-2624ix) can
be installed in any hub in the stack, making it possib le to transp arently br idge
between the 10Mbps and 100Mbps segments. In a managed hub stack, more
than one DFE-260S module can be used to provide redundancy if the two
modules are both in the primary master hub segment..

Other add-in modules are also available, providing 100BASE-TX, or
100BASE-FX connections. DFE-2600 series hubs each have two slots for
accepting slide-in modules.

Product Features

The list below highlights the features and specifications of the DFE-2600
series hubs.

♦

Compatible with the IEEE 802.3 10BASE-T Ethernet and 802.3u
100BASE-TX Fast Ethernet industry standards for interoperability
with other Ethernet/Fast Et hernet network devices.

♦

Ethernet connections support Category 3 or better twisted-pair cables.

♦

Fast Ethernet connections support both shielded twisted pair and
Category 5 unshielded twisted-pair cables.

♦

Fast Ethernet connections support a maximum distance of 100 meters
from end-station to hub, and a total network diameter of 205 meters.

♦

Sixteen (DFE-2616, DFE-2616x, DFE-2616i, DFE-2616ix) or twenty­four (DFE-2624, DFE-2624x, DFE-2624i, DFE-2624ix) NWay RJ-45
ports for connecting stations to the network.

♦

Auto negotiated connection speed (NWay) on each port.

Introduction 3

♦

Full hub stack and ne twork management provid ed via a n SNMP man­agement agent (DFE-2616i, DFE-2616ix, DFE-2624i, DFE-2624ix).

♦

An optional slide-in switch module allows bridging between 10Mbps
and 100Mbps segments. Only one switch module is needed per stack,
but managed hub stacks can make use of additional switch modules
for redundancy

.

♦

LED indicators for power, collisions, link, network activity, parti­tioning status, disable, operating speed (10 or 100Mbps) and network
utilization.

♦

Digital hub ID number front panel display.

♦

Auto-partition protection.

♦

Data collision detection and hand ling.

♦

Preamble re generation, signal retiming.

♦

Two proprietary daisy-chain ports for cascading up to five hubs to
form one logical hub ; manage ment provided via a master hub.

♦

Standby backup master capability when two master model hubs are
present within a single stack.

♦

Uplink port allows easy linking of two Fast Ethernet or fo ur Ethernet
hub stacks to further expand your network.

♦

Standard-size (19”, 1.25U height), rack mountable

♦

Built-in, removable power supply, replaceable without opening the
hub. Power supply is easily removed and replaced. Automatic volt­age selection (100V to 240V, 50 or 60Hz) without fuses to change or
a voltage switch to set.

♦

Optional slide-in modules: Switch, 100BASE-TX, and 100BASE-FX
(see Chapter 4

: Making Connections).

Dual-Speed Stackable Hubs User’s Guide

Introduction4

Dual-Speed Ethernet Hub
Technology Overview

Dual-speed Ethernet hubs have been developed to make it simpler to plan
networks containing both 10-Mbps Ethernet and 100-Mbps Fast Ethernet
technologies, especially when network hosts are being gradually migrated to
new Fast Ethernet connec tions.

Ethernet and Fast Ethernet workgroups, also called collision domains, are
configured in a star topology where all end-nodes (computers, servers,
bridges, etc.) branch out from a central hub. Two hubs can also be plinked’

to each other to form a much larger collision domain consisting of two linked
stars. And collision d omains can be easily interconnecte d through switching
hubs and bridges to form a network large enough to encompass a high-rise
building or campus enviro nment.

A dual-speed hub is actually two repeaters in one housing. Any device that is
plugged into the hub is automatically connected (by NWay) to the fastest
repeater it can use. The 10-Mbps repeater receives Ethernet transmissions
from any port connected to it, and retransmits them to all other ports operat­ing at 10 Mbps. Similarly, the 100-Mbps repeater retransmits Fast Ethernet
transmissions from ports operating at 100 Mbps to all other ports operating at
the same speed as shown below.

10Mbps Repeater

100Mbps Repeater

NWay Detection

RJ-45 Ports

100Mbps

Ethernet

Station

100Mbps

Ethernet

Station

10Mbps

Ethernet

Station

10Mbps
Ethernet

Station

100Mbps

Ethernet

Station

Introduction 5

If there is a switching circuit in the hub (or in any hub in a stack), it will serve
as a bridge between the two repeaters.

10Mbps Repeat er

100Mbps Repeat er

NWay Detectio n

RJ-45 Ports

100Mbps

Ethernet

Station

100Mbps

Ethernet

Station

10Mbps

Ethernet

Station

10Mbps

Ethernet

Station

100Mbps

Ethernet

Station

Switching

Circuit

The switching circuit does not, however join the 10Mbp s Ethernet collision
domain with the 100Mbps Fast Ethernet collision domain; it only allows them
to communicate. The two repeaters are two separate collision domains re­gardless of whether a switching circuit is present.

If a DFE-2600 series hub or hub stack is uplinked through a twisted-pair or
Uplink port to another dual-speed or Fast Ethernet hub or stack, the hub will
function as a Class II Fast Ethernet device and be subject to those connectiv­ity rules. If it is uplinked to a 10BASE-T Ethernet hub or stack (10Mbps
only) then it will function as a normal 10BASE-T Ethernet repeater and is
then subject to those connection rules. And because it is a dual-speed hub
with two separate repeaters, it can connect to both at the same time, counting
as a repeater in each of the collision domains. For more detailed information,
please refer to Chapter 4,

Making Connections

.

Dual-Speed Stackable Hubs User’s Guide

Unpacking and Setup6

2

2 U

NPACKING AND

S

ETUP

This chapter provides information on the unpacking and initial installatio n of
your hub stack.

Unpacking

Open the shipping carton of your hub and carefully unpack the contents. The
carton should contain the following items:

♦

One dual-speed stackable hub

♦

One AC power cord, suitable for your area electrical power con­nections

♦

One daisy-chain cable

♦

Four rubber feet to be used for shock cushioning

♦

Six screws and two mounting brackets

♦

D-View module diskette (master models only)

♦

This

User Guide

Unpacking and Setup 7

Inspect the hub and all accompanying items. If any item is damaged or
missing, report the problem to your D-Link dealer.

Identifying External Components

This section identifies all the major external components of the hub. Both the
front and rear panels are shown, followed by a description of each panel fea­ture. The indicator panel is described in detail in the next chapter.

Front Panel

DFE-2624i / DFE-2624ix Front Panel

DFE-2624 / DFE-2624x Front Panel

DFE-2616i / DFE-2616ix Front Panel

DFE-2616 / DFE-2616x Front Panel

Dual-Speed Stackable Hubs User’s Guide

Unpacking and Setup8

♦ LED Indicator Panel

Refer to the next chapter,

Understanding Indicators

, for detailed infor-

mation about each of the hub LED indicators.

♦ Twisted-Pair Ports

Use any of these ports to connect stations to the hub. The ports are MDI­X Nway ports, which means you can use ordinary straight-through
twisted-pair cable to connect the hub to PCs, workstations, or servers
through these ports, and the speed of the connection will be detected
automatically. If you need to connect to another device with MDI-X
ports such as another hub or an Ethernet switch, you should use a cross­over cable, or connect using the Uplink port (described below). For more
information about crossover connection, see the

Crossover Cables

section

on page 112.

♦ Uplink Port

The Uplink port is an MDI port, which means you can connect the hub (or
hub stack) to ano ther de vice with MDI-X p o rts using a n or di nar y straight­through cable, making a crossover cable unnecessary.

Port 1 and the Uplink port are the same logical port, except their pinouts
are different.

Do not use both Port 1 and the Uplink port at the same

time.

Unpacking and Setup 9

Rear Panel

(Note that the figure shows the rear panel for master models.)

♦ Module Slots

Used to install module options for various kinds of additional connec­tions, as well as the DFE-260S 10Mbps/100Mbps bridge module. (In the
DFE-2616x, DFE-2616ix, DFE-2624x and DFE-2624ix, module slot 1 is
already occupied by the switch module which is standard on these mod­els.)

♦ Daisy-Chain IN Port

When cascading a set of D-Link stackable dual-speed hubs, this port
should be connected to the Daisy-Chain OUT p ort of the previous hub in

the stack (usually placed immediately above it). A cascade of five hubs
can be created in this way. The first and last hubs in the stack use only
one of the daisy-chain ports, while the others use both.

♦ Daisy-Chain OUT Port

Works in conjunction with the Daisy-Chain IN Port (see above). Connect
this port to the Daisy-Chain IN Po rt of the next hub in the stack (usually
placed immediately below it), using the enclosed daisy-chain cable.

♦ Diagnostic (Console) Port -- Master Models Only

Dual-Speed Stackable Hubs User’s Guide

Unpacking and Setup10

This 9-pin serial connector is used for connecting a console to the DFE­2600 series master hubs for out-of-band management of this particular
hub or the entire stack.

♦ Fan

Provides air circulation and heat dissipation. Be sure to leave adequate
space at the rear of the unit for proper ventilation.

♦ AC Power Connector

For the power cord.

Installing the Hub

Installation

The site where you install the hub stack may greatly affect its performance.
When installing, consider the following pointers:

♦

Install the hub stack in a fairly cool and dry place. See Appendix D,

Specifications

, for the acceptable temperature and humidity operating

ranges.

♦

Install the hub stack in a site free from strong electromagnetic field
generators (such as motors), vibration, dust, and direct exposure to
sunlight.

♦

Leave at least 10cm of space at the front and rear of the hub for ven­tilation.

♦

Install the hub on a sturdy, level surface that can support its weight, or
in an EIA standard-size equipment rack. For information on rack in­stallation, see the next section,

Rack Mounting.

Unpacking and Setup 11

When installing the hub stack on a level surface, attach the rubber feet to the
bottom of each device. The rubber feet cushion the hub and protect the hub
case from scratching.

Rack Mounting

The hub can be mounted in an EIA standard-size, 19-inch rack, which can be
placed in a wiring closet with other equipment. Attach the mounting brackets
at the hub front panel (one on each side), and secure them with the provid-

ed screws.

Then, use screws provided with the equipment rack to mount each hub in the
rack.

Dual-Speed Stackable Hubs User’s Guide

Unpacking and Setup12

Replacing the Pow er Supply

The hub comes with a removable power supply for easy replacement. In the
unlikely event that the power supply fails or is damaged, follow the steps
below to replace it:

1.

Disconnect the power cord from the AC outlet.

2.

Disconnect the power cord from its connector on the rear of the hub.

3.

Using a Phillips screwdriver, remove the screws securing the power
supply to release the unit.

4.

Remove the power supply by sliding it out the rear of the chassis. Do
not plug in the power supply when it is outside the chassis! Doing so
could cause personal injury or damage to the power supply.

Unpacking and Setup 13

5.

Slide the replacement power supply into the chassis, engaging the
connector carefully.

6.

Attach the power cord to the connector of the power supply and con­nect the other end of the power cord to the AC supply source.

Understanding Indicators 15

3

3 U

NDERSTANDING

I

NDICATORS

Before connecting network devices to the hub, take a few minutes to look
over this section and familiarize yourself with the front panel LED indicators
of your dual-speed hub, depicted below.

DFE-2624i / DFE-2624ix Indicator Panel

DFE-2616i / DFE-2616ix Indicator Panel

Dual-Speed Stackable Hubs User’s Guide

Understanding Indicators16

DFE-2624 / DFE-2624x Indicator Panel

DFE-2616 / DFE-2616x Indicator Panel

Hub State Indicators

♦ Power Indicator

This indicator lights green when the hub is receiving power; otherwise, it
is off.

♦ Collision Indicators (COL10 and COL100)

These indicators indicate data collisions on the respective 10Mbps Ether­net or 100Mbps Fast Ethernet segments of the hub. (If several hubs are
stacked or linked together, all of them should detect and indicate the same
collision, since collisions span the entire network segment.) Whenever a
collision is detected, the respective COL indicator will briefly blink am­ber.

Understanding Indicators 17

♦ Segment Utilization % (10Mbps and 100Mbps)

The utilization bar graphs provide a quick reference on the current traffic
load relative to the total available 10Mbps or 100Mbps network band­width. The graphs display a measure of the percentage of bandwidth in
use on the respective network segment. All data packets are counted,
whether valid or not.

♦ Hub ID Indicator

The Hub ID readout shows the ID (group) number of the hub within the
hub stack. The first time a hub is powered on within a hub stack, the
master hub in the stack assigns that hub an available ID number which is
then added to each hub factory serial number (encoded on an EEPROM

memory chip). The hub ID is then permanently assigned.

In an unmanaged stack (all slave models), all IDs will read “0” and no
permanent ID assignment is made. In a stack with a master (intelligent)
model, the master hub will detect the other hubs in the stack and auto­matically assign ID numbers which are then permanently saved by each
hub.

Module Indicators

The two module indicators, SLOT1 and SLOT2, indicate a good link to a
module installed in the respective slot. For the DFE-260S switch module the
indicator will come on when the module is installed. For the DFE-260FX
and DFE-260TX modules, the slot link indicator should light whenever the
module is installed and there is a valid link.

Dual-Speed Stackable Hubs User’s Guide

Understanding Indicators18

Port State Indicators

There is one port state indicator for each of the twisted-pair ports on the hub.
Each port LED status indicator reports the port link and activity status,

and shows whether or not the port has been partitioned.
The following describes each indicator and the meaning of each condition:

♦ Link (green)

The indicator of a port lights green when the port is connected to a pow­ered Ethernet or Fast Ethernet station. If the station to which the hub is
connected is powered off, or if there is a problem with the link, the LED
will remain off.

♦ Receive (blinking green)

When information is received on a port, its indicator will blink off briefly.
Upon reception, the data will be transmitted to all other connected ports.

♦ Auto-partition (blinking amber)

The indicator of a port blinks amber when the port is automatically parti­tioned due to an abnormal network condition.

The hub will temporarily partition a port when too many line errors or too
many collisions are detected on the port. While the segment is automati­cally partitioned, the port will be isolated from the rest of the network
segment. When the problem is corrected or a valid data packet is re­ceived through the port, the port is automatically reconnected.

♦ Disabled (steady amber)

The indicator of a port is orange when the port has been manually dis­abled. No packet transmission or reception can occur on the port.

Understanding Indicators 19

If there is a DFE-2616i, DFE-2616ix, DFE-2624i, or DFE-2624ix master
hub in the stack, then ports can be manually disabled and enabled via the
on-board console interface or via an SNMP-based network management
program such as D -Link D -View Networ k Manage ment Pro gram. Y ou

can choose to partition a po rt even when there is nothing wrong with it,
for example, to prevent a certain device from accessing the network.

SNMP Indicator

(Master models only)
This indicator comes on when the SNMP agent of a DFE-2600 series master

hub is active. In a stack with both a Primary and a Backup Master, the
SNMP LED of the Primary master will be lit and will flash to indicate SNMP
activity. The SNMP LED of the Backup Master will remain off at all times.

Port Speed Indicators

There is also a port speed indicator for each of the twisted-pair ports on the
hub. A port speed indicator should light green when a 100BASE-TX de-

vice is connected to the port, and remain dark if the port is unconnected or if
a 10BASE-T device is connected.

Console Port Indicator (CON)

(Master models only.)
This indicator lights continuo usly under the follo wing two conditions:

Dual-Speed Stackable Hubs User’s Guide

Understanding Indicators20

1. A good connection has been established with a console (for example,
a PC or other computer). The diagnostic port of a DFE-2600 series
master hub must be connected to the console's RS-232 serial port us­ing a normal serial cable.

OR

2. The console computer is on-line and connected to the on-board con­sole program either through terminal emulation or a TELNET se ssion.

Refer to Chapter 4,

Making Connections

, for directions on establishing a

connection with the diagnostic port, and Chapter 5,

Master Hub Setup and

Management

, for information about how to use the console interface.

Making Connections 21

4

4 M

AKING

C

ONNECTIONS

This chapter discusses how to cascade hubs to create a stack, make connec­tions to the hub twisted-pair and console por ts, and link this hub with other

hubs (or hub sta cks).

Hub Cascading/Building a Stack

You can stack up to five hubs using the daisy-chain ports located on the rear
of the hub to form one logical hub. In this configuration, the interconnected
hubs constitute a single repeater, providing a maximum of 120 twisted-pair
ports.

Use the provided daisy-chain cable to connect the Daisy-Chain OUT port on
the rear panel of one hub to the Daisy-Chain IN port on the hub below it, as
shown in the figure below. Repeat this procedure for each hub to be included
in the stack.

Each time a new hub is added to the stack, all hub IDs will temporarily revert
to 0, indicating a system reset. After the reset, the hub IDs should return to
their previous values.

Dual-Speed Stackable Hubs User’s Guide

Making Connections22

Hubs should not be added to the stack or removed from the stack while the
power is on to any hub in the stack.

Note: Always turn off power to the entire stack be-

fore adding or removing hubs

.

Making Connections 23

Connectivity Rules

Ethernet (10Mbps) networks have the following connectivity rules:

♦

The maximum length of a twisted-pair cable segment is 100 meters.
Cabling should be Category 3 or better.

♦

Between any two end-stations in a collision domain, there may be up
to five cable segments and four intermediate repeaters (hubs, hub
stacks, or other repeaters).

♦

If there is a path between any two end-stations containing five seg­ments and four repeaters, then at least two of the cable segments must
be point-to-point link segments (e.g., 10BASE-T or 10BASE-FL),
while the remaining segments may be populated (mixing) segments
(e.g., 10BASE-2 or 10BASE-5).

Fast Ethernet (100Mbps) networks have the following connectivity rules:

♦

The maximum length of a twisted-pair segment (that is, the distance
between a port in the hub to a single-address network device such as a
PC, server, or Ethernet switch) is 100 meters. Cabling and other wir­ing should be certified as Category 5 UTP or shielded twisted­pair(STP).

♦

The maximum diameter in a collision domain is about 205 meters us­ing two Class II hubs (or hub stacks).

♦

Between any two end-stations in a collision domain, there may be up
to three cable segments and two Class II hubs or hub stacks.

Dual-Speed Stackable Hubs User’s Guide

Making Connections24

The Diagnostic Port

The diagnostic port o n the rear panel of the master hub is used to establish a
connection with a device to allow in-band or out-of-band management of the
DFE-2600 series hubs stacked with it. The console device connected to the
diagnostic por t can be a terminal (or a computer running terminal-emulating
software) or a PC running TCP/IP TELNE T.

Diagnostic Port Connection

The diagnostic port is an RS-232 DCE interface. To establish a physical line
connection with an RS-232 serial port (DTE) on a PC acting as a console, all
you need is a straight serial cable, as shown in the diagram below. Note that
a DCE-to-DTE connection requires a straight serial cable, not a null-modem
cable.

You can use the diagnostic port on a DFE-2600 series master hub to connect
a VT100-compatible terminal or a computer running an ordinary terminal
emulation program (such as the terminal program included with the Windows
operating system). In all cases, your terminal parameters will need to be set
to:

♦

VT-100/ANSI compatible,

♦

Arrow keys enabled,

♦

9600 baud,

♦

8 data bits,

♦

No parity,

♦

1 stop bit.

You can also access the same functions over a TELNET link. Once you have
set an IP address for your hub (see In-Band Setup Instructions on page 37),

Making Connections 25

you can use a TELNET program (in a VT-100 compatible terminal mode) to
access and control the hub. All of the screens are for the most part identical,
whether accessed from the diagnostic port or from TELNET.

A console device can manage a DFE-2600 series master hub operating in
a stack master or stand-alone master role. Use the on-board console pro­gram for out-of-band management or D-View (included with DFE-2600
series master hubs) for in-band or out-of-band management. Other
SNMP management software will also work fine.

A console device can only manage a DFE-2600 series hub if it is stacked
with a DFE-2600 series master hub. Use either the on-board console pro­gram or an SNMP-based network management program to manage the
stack.

Hub to End-Station Connection

After installing the hub properly, it can support up to sixteen (DFE-2616,
DFE-2616x, DFE-2616i, DFE-2616ix) or twenty-four (DFE-2624, DFE­2624x, DFE-2624i, DFE-2624ix) end-station connections. Fast Ethernet

Dual-Speed Stackable Hubs User’s Guide

Making Connections26

connections require either a Category 5 UTP cable or an STP cable. These
cables can be up to 100 meters long.

Each Ethernet connection requires a Category 3 or better UTP cable and can
also be up to 100 meters long. It is recommended that you use Category 5
cabling for all connections, in order to make it easier to transition all stations
to 100Mbps.

You can connect any combination of PCs, servers, and other single-address
network devices to the twisted-pair po rts using straight-through twisted-pair
cables. These cables should not be crossed over. The following figure illus­trates the pin assignments for a straight-through cab le:

When connecting a PC or a server, the system being connected should have
an Ethernet or Fast Ethernet network interface card with a twisted-pair port.
The following figure shows a typical connection between the hub and end­stations:

Making Connections 27

Hub-to-Hub Uplink

You can link two hubs or hub stacks to each other using any of the normal
twisted-pair (1x - 24x) p orts or the Uplink po rt. Linking hubs using normal
twisted-pair ports requires crossover twisted-pair cables; linking using one
normal twisted-pair port and the Uplink port requires an ordinary straight­through twisted-pair cable.

The Uplink port is shared with Port 1 and

they cannot be used at the same time.

The following table describes different methods of linking hubs:

Dual-Speed Stackable Hubs User’s Guide

Making Connections28

DEVICE PORT

USED

DEVICE BEING

CONNECTED

PORT

TYPE

CABL

E TO USE

Hub or

Normal Crossover (X)

Normal

Switch

Uplink Straight-Through (||)

Hub

Server (or PC) Straight-Through (||)
Hub or

Normal Straight-Through (||)

Uplink

Switch

Uplink Crossover (X)

Server (or PC) Crossover (X)

A crossover cable is a twisted-pair cable in which the wires have been
crossed. The figure below shows the pin assignments for an Ethernet or Fast
Ethernet crossover cable:

NOTE:

The port 1 1X jack shares its circuitry with the

Uplink

jack. If you connect a hub to the

Uplink

jack, you cannot plug anything into the

1X

jack. And the reverse is also true; if any-

thing is plugged into the

1X

jack, the

Uplink

jack cannot be used.

When uplinking two dual-speed or Fast Ethernet hubs or hub stacks in this
fashion, the maximum distance between any two end-stations in a collision
domain is 205 meters. If the length of the longest hub to end-station connec-

Making Connections 29

tion on each hub is 100 meters, then the hub-to-hub connection is limited to 5
meters. However, if the longest hub-to-end-station connection is less than
100 meters, then the hub-to-hub connection can be up to 100 meters long.
Almost any variation of cable lengths are possible as long as each segment is
shorter than 100 meters and the total network diameter does not exceed 205
mete rs.

The DFE-2600 are dual-speed hubs capable of operating at both 10Mbps
(Ethernet) and 100Mbps (Fast-Ethernet). The connection speed is automati-

cally determined using the built-in NWay auto-detection technology, which
will always choose the fastest possible connection speed. Thus, if a DFE­2600 series hub or hub stack is linked through a twisted-pair or Uplink p ort
to another dual-speed or Fast Ethernet hub or hub stack, the connection speed
will be 100Mbps, which will limit the total number of hubs or hub stacks in
the network to two and the total network diameter to 205 meters. If a DFE­2600 series hub or hub stack is linked through a twisted-pair or Uplink p ort
to a 10Mbps (only) Ethernet hub or hub stack, the connection speed will be
10Mbps, the maximum number of hubs/stacks in the network will be four,
and the total network diameter can be 500 meters maximum (assuming the
entire network is composed of twisted-pair wiring).

Since the DFE-2600 series hubs are dual-speed hubs containing two separate
repeaters, they can be part of a Fast Ethernet collision domain and a normal
Ethernet collision domain at the same time, counting as one repeater in each.

Optional Module Connections

There are three optional modules that may be added to any of the DFE-2600
series hubs. Each hub can accommodate two modules. Each of the modules
offers a different additional network interface that allows for greater flexibil­ity in how these hubs may be used in a network.

The sections that follow provide a brief overview of the module and basic
instructions on any settings and indicators.

Dual-Speed Stackable Hubs User’s Guide

Making Connections30

Module Installation

The installation procedure for each module is the same. Additional informa­tion about each module is provided below.

To install any of the modules:

1. Locate one of the module slots in the hub rear panel. (Note that the

DFE-260S module can only be installed in Slot 1 - the center slot.)

2. Using a screwdriver, undo the two screws and remove the dust cover on

the module slot.

3. Holding the module component-side up and connector-side in, gently

slide the module along the guides and seat it in the internal connector.

4. Using a screwdriver, replace the two screws and tighten until snug.

We recommend that you retain the dust cover in case you need to remove the
module for an extended period sometime in the future.

Making Connections 31

Switch Module (DFE-260S)

The DFE-260S switch module is used to allow interconnection between the
10Mbps and 100Mbps segments in the hub or hub stack. Each hub stack
should have one DFE-260S module (such as the one included in the DFE­2616x, DFE-2616ix, DFE-2624x or DFE-2624ix) to allow 10Mbps and
100Mbps stations to intercommunicate.

Note that the DFE-260S module

can only be installed in Slot 1 – the center slot

. Also, the presence of
switch modules and their operational status can be viewed on the etwork
Monitoring – Bridge Information” screen.

NOTE:

In a stack containing a DFE-2616i, DFE-2624i,
DFE-2616ix, or DFE-2624ix intelligent master
hub, more than one DFE-260S switch module
may be used to provide increased reliability
through redundancy. The software manage­ment agent can control the DFE-260S
modules to provide link redundancy and pre­vent network loops but only when multiple
modules are installed in hubs on the primary
master segment.

Fiber Optic Module (DFE-260FX)

The Fiber Optic module provides a standard Fast Ethernet 100BASE-FX
fiber optic connector. A fiber optic connection of this kind is particularly
useful for creating a link between two DFE-2600 series hub stacks, placing
them in separate collision domains. A link of this sort eliminates the need for
an external switch to divide stacks into separate domains. Dividing the stacks
into separate collision domains overcomes the Fast Ethernet two-repeater
limitation, and effectively doubles overall bandwidth.

The Fiber Optic module includes the following LED indicators:

Dual-Speed Stackable Hubs User’s Guide

Making Connections32

• Power/Tx

his LED is lit when the hub is on and blinks when packets

are being transmitted by the module.

• Link/Rx

his LED is lit when the fiber optic ports are properly connect-

ed to a powered-on device and blinks when packets are being received
by the module.

• Collision

his LED blinks when there are packet collisions on the fiber

optic link.

• FDX

his LED is lit when the fiber optic port is set for Full Duplex

transmit and receive. When the LED is off, the fiber optic port is in Half
Duplex mode.

The duplex mode DIP switch allows you to set the fiber optic lines to Full
Duplex mode operation. Only the right-hand switch (number 2) is active.
Use it to set the duplex mode.

Fast Ethernet Module (DFE-260TX)

The Fast Ethernet module provides one additio nal twisted-pair Fast Ethernet
connection. A twisted-pair connection of this kind is particularly useful for
creating a link between two DFE-2600 series hub stacks, placing them in
separate collision domains. A link of this sort eliminates the need for an ex­ternal switch to divide stacks into sepa rate domains. Dividing the stacks into
separate collision domains overcomes the Fast Ethernet two-repeater limita­tion, and effectively doubles overall bandwidth.

Making Connections 33

The Fast Ethernet module uses a MDI-X connector (not a straight MDI) and,
therefore, a crossover cable must be used when connecting the module to
another module (and under most other circumstances). See Appendix A for
pinout information.

The Fast Ethernet module includes the following LED indicators:

• Power/Tx

his LED is lit when the hub is on and blinks when packets

are being transmitted by the module.

• Link/Rx

his LED is lit when the port is properly connected to a pow-

ered-on device and blinks when packets are being received by the
module.

• Collision

his LED blinks when there are packet collisions on the mod-

ule line.

• FDX

his LED is lit when the port is set for Full Duplex transmit and

receive. When the LED is off, the port is in Half Duplex mode.

NOTE: Because the DFE-260TX module port is an

NWay UTP port, once the hub is pow ered on,
it will automatically detect the duplex and
speed modes of any device connected to it.
The DIP switch may then be set to force the
duplex mode into a particular state. After the
DIP switch is set, the DFE- 260TX will only op-

Dual-Speed Stackable Hubs User’s Guide

Making Connections34

erate at 100Mbps in the duplex mode se­lected.

The duplex mode DIP switch allows you to set the por t to Full Duplex mode
operation. Only the right-hand switch (number 2) is active. Use the DIP
switch to set the duplex mode.

Master Hub Setup and Management 35

5

5 M

ASTER

H

UB

S

ETUP

AND

M

ANAGEMENT

The DFE-2616i, DFE-2616ix, DFE-2624i, and DFE-2624ix master hubs
(hereafter and elsewhere referred to as, FE-2600 series master hubs”)

provide an on-board console program that allows you to set up and control all
DFE-2600 hubs stacked with it. This program can be accessed either with an
ordinary terminal (or terminal emulator) or over the network using the
TCP/IP TELNET protocol. You can use this program to perform many basic
network management functions.

The console program also allows you to prepare the hub for management
using D-View or another SNMP-based network management system. This
chapter describes how to use the console program to access the hub, change
its settings, and monitor its operation.

Note that if you want to manage the hub in-band you need to follow the in­structions in the first section of this chapter to prepare the hub for in-band
management. If you need infor mation about connecting a console device to
the diagnostic port for out-of-band management, see the relevant sections of
Chapter 4.

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management36

Navigation and Conventions

This section de scribes how to navigate the master hub management software
and the conventions used in that software.

Navigation

The Tab keys move the cursor from field to field. Note that they are uni­directional (i.e., Shift-Tab is not a functional combination). Up and Down
arrow keys allow cursor movement between some fields.

The Spacebar is a toggle switch for all variables that can be changed but
wherein possible values are preset.

The Delete and Backspace keys remove entered text as in most software
packages.

Pressing Ctrl-r refreshes the current screen.

Screen Conventions

Fields that cannot be changed are preceded by a colon (“:”).
Toggle changed fields are surrounded by angle brackets <>.
Variables with values that must be keyed-in are surrounded by square brack-

ets [ ].
Uppercase letters are reserved for command items such as SAVE or

LOGOFF. Highlighting the item and pressing Enter activates the command.

Note: Both the navigation and screen conventions

information can be obtained under HELP in
the system management software.

Master Hub Setup and Management 37

In-Band Setup Instructions

This section describes ho w to setup the hub fo r in-b and management.

Getting Started

Physically install and cascade the hubs and power on the hub stack according
to the directions in other parts o f this manual. At this point, the hub stack is
ready for use as an ordinary unmanaged repeater.

The master hubs in the series come without IP addresses assigned (IP =

0.0.0. 0). If you want to manage your hubs using a network management sys­tem, you will have to assign an IP address to the primary master hub, and if
applicable, the backup master. IP addresses must be assigned to the master
hubs before any type of management is possible. After an IP address is set the
first time, it can later be change d by using a network management program.
There are two ways to initially assign an IP address to a master hub; using
BootP and by using a Console conne ction to the Diagnostic Port.

Assigning an IP Address Using BOOTP

If your Fast Ethernet network has a BOOTP (BOOTstrap Protocol) server,
you need only add the hub Ethernet (MAC) address (which is printed on a

sticker on the bottom of the hub, or which you can determine using the master
hub console interface), IP address, subnet mask, and boot configuration file­name to your BOOTP server configuration tables. The boot configuration

filename field of the hub BOOTP configuration table should contain the
filename of a DFE-2600 series master hub boot configuration file accessible

on your local TFTP (Trivial File Transfer Protocol) server. This file can be
empty. For more detailed information about the boot configuration file con­tents, see

Appendix C : Boot Configuration File

of this manual.

Assigning an IP Address Using the Diagnostic Port

To assign an IP address to a hub manually,

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management38

1.

Connect a VT-100 compatible terminal or a personal computer run­ning a VT-100 compatible terminal emulation program to the DB-9
console port at the rear of the master hub. The cable should be an or­dinary RS-232C cable. The terminal communications parameters
should be set to 9600bps, 8 bits, no parity, and 1 stop bit.

2.

Turn on hub.

3.

As the hub begins its boot process, hit Control-C to enter the PROM
System Menu.

4.

Choose TCP/IP Parameters Configuration, and enter a valid IP ad­dress, network mask, and (optional) gateway router IP address.
Choose SAVE and press

<Enter>

to let the changes take effect, and

then choose EXIT.

5.

If you will be using TFTP to download a hub configuration file,
choose Software Update and toggle the Software Update Control to
Enable using the Space Bar. Again, choose SAVE and then EXIT.

6.

Choose Execute Bootstrap to restart the hub.

If you are using a backup master hub, reconnect the RS-232C cable to the
backup master and repeat the same procedures listed above (the backup
master must have a different IP Address than the primary master).

You are now ready to use your DFE-2600 series hub stack, and to manage it
from a network management station on your network. See the

Stack Man-

agement User Guide

for more information about how to manage the stack

using the D-View Network Management Program.

Backup Master Function

Within a DFE-2600 series hub stack, in addition to a master hub for man­agement purposes (the primary master), a standby backup master can also be

Master Hub Setup and Management 39

installed. If a hub stack has two master units, the master unit powered-on
first or the unit which is higher in the stack will manage the stack and be
designated the rimary Master.” Master hubs in the series include a built-in

contention algorithm which determines which hub will manage the stack and
which will operate in standby mode. If, during power-on, the two master
hubs in the stack both attempt to initialize as the Primary Master, this colli­sion will result in an automatic stack reset indicated by all hub ID numbers
changing to 0 tempora rily. If the cur re ntly managing hub fa ils or is po wered ­off, the standby master will take over management of the hub stack.

Segmenting Hubs

Switching hub technology has made it more common to segment local area
networks into smaller pieces to reduce congestion. Segmenting makes it
easier to balance network loads, since a smaller number compete for the
bandwidth available.

A hub stack makes network management convenient, but too many stations
on a single network segment may give slow respo nse at peak network loa ds.
Therefore, this hub series provides a way to segment hubs from the stack into
their own collision domains. Segmenting hubs can be accomplished with a
simple management command and does not require any hardware or wiring
changes.

Though the hubs continue to be cascad ed together a nd are managed as a sin­gle unit, each hub can either be a part of the collision domain of the rest of
the stack, or can be sep arated into its own network segment. These sep arate
segments can be bridge d by conne cting them through a co mpatible switching
hub.

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management40

The figure above shows an unsegmented hub stack. All hubs in the stack are
in the same collision domain because they are connected together thr ough the
daisy-chain ports.

The figure below shows a stack divided into three separate collision do mains.
Hubs three and four are isolated from the main segment (collision domain
one) using the hub's segmentation capability, putting them into their own
isolated collision domains two and three respectively. A switch, bridge or
router can be used to connect the three collision domains so that traffic can
pass between them, yet keeping them isolated to reduce congestion on each
segment.

Master Hub Setup and Management 41

For information ab out segmenting hubs using the network management mod­ule for the hub, see the ub Stack Management: Controlling Hubs in the

Hub Stack” section later in this chapter.

NOTE: Hub segmentation is controlled by the master

hub. When the master hub completes its ini­tialization, it will restore any prior segmentat ion
of the hubs. Therefore, if you are using a
switch or bridge to join different segments, be
sure to enable the IEEE 803.1d Spanning Tree
Protocol to prevent temporary network loops

Logging in to the Hub Console

The DFE-2600 series master hubs support user-based security that allows you
to prevent unauthorized users from accessing the hub or changing its settings.
This means that before you can access the functions of the hub, you will need
to first log into the hub, p roviding a password. This section tells how to log
onto the hub, and how to change your password.

Logging In

When you first connect to the hub, it will display the login screen:

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management42

DFE-2600 Dual speed Stackable Hub Telnet Remote Management Ver0

Copyright(C) 1995-96 D-Link Corp.

User Name [ ]
Password [ ]

OK CLOSE CONNECTION

To log in, complete these steps:

1.

Type in your user name and press

<Enter>.

2.

Type in your password and press

<Enter>.

3.

With the cursor on the OK selection, press

<Enter>.

NOTE:

When the hub is shipped, the default user
name is

D-Link

, and the default password is

also

D-Link

. You will need to use this user
name and password when you first set up your
hub or if you use the Factory Reset NVRAM to
Default Value menu selection.

Change this
user name and password to protect the se­curity of your hub.

There are two levels of user privilege:

Super User

and

General User

. The

default user (

D-Link

) has

Super User

privileges. Some functions available to

Super Users

are not available to

General User

s. The main menu below is the

menu for

Super Users:

Master Hub Setup and Management 43

DFE-2600 Stackable Hub - Main Menu

System Configuration
TCP/IP Parameters Configuration
Network Monitoring
Out-of-Band/Console Configuration
User Account Change
SNMP Trap Manager Configuration
SNMP Manager Configuration
System Reset
Software Update
Factory Reset NV-RAM to Default Value

LOGOFF

Changing Your Password

To change your user password, follow these steps:

1.

Choose

User Account Change

from the main menu.

2.

Select

Change Password.

The following screen will be displayed:

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management44

DFE-2600 Stackable Hub - User Acco unt Change : Change Password

User Name [ ]
Old Password [ ]

New password [ ]
Confirm Password [ ]

HELP SAVE EXIT

3.

Type in your user name and press

<Enter>.

4.

Type in your old password and press

<Enter>.

5.

Type in the new password you have chosen, and press

<Enter>.

Type in the same new password again in the next blank space to verify
what you typed.

6.

Choose

SAVE

to put the new password into effect.

7.

Choose

EXIT

to exit this screen.

This method can also be used by a

Super User

to change another user

password.

Master Hub Setup and Management 45

Setting Up the Master Hub

This section describes ho w to set the hub conso le parameters for the vari­ous management options it supports. Note that the hub can be managed in-

band or o ut-of-band, and either through the built-in console p rogram, or us­ing an SNMP-management program such as D-View.

TCP/IP Settings

The hub needs to have an IP add ress assigned to it so that the ne twork man­agement system or TELNET client can communicate with it over the
network. The T CP/IP P arameters Co nfiguration Menu allo ws you to change
the settings for the two different interfaces used by the hub: the internal Fast
Ethernet interface used for in-band communication, and the SLIP interface
used through the di agnostic port for out-of-band communication.

Note: if you need to set an IP address so that you can access the hub console
through a network, see the first section of this chapter.

Saved changes to any of the fields on this menu take effect the next time the
system is restarted. Fields that can be set include:

♦ Interface

. This parameter displays the type of interface the hub will use

for management communications.

♦ IP Address

. This parameter determines the IP address used by the
hub for receiving SNMP and TELNET messages. Should be of the
form xxx.xxx.xxx.xxx, where each xxx is a number (represented in
decimal) between 0 and 255. This address should be a unique address
on the network assigned to you by a network administrato r. T he same
IP address is shared by both the SLIP and Ethernet network interfaces.

♦ Subnet Mask

. This parameter sets the subnet mask that determines
the level of the subnet that the hub is on. Should be of the form
xxx.xxx.xxx.xxx, where each xxx is a number (represented in decimal)
between 0 and 255. If no subnetting is being done, the value should

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management46

be 255.0.0.0 for a Class A network, 255.255.0.0 for a Class B net­work, and 255.255.255.0 for a Class C network.

♦ Default Gateway

. This parameter specifies the IP address for a
gateway or a router where frames with destinations outside the current
subnet should be sent. If your network is not part of an internetwork,
or you do not want the hub to be accessible outside your local net­work, you can leave this field blank.

♦ Send BOOTP Request Upon Power Up

. This parameter determines
whether or not the hub should send out a BOOTP request when it is
powered up. The BOOTP protocol allows IP addresses, network
masks, and default gateways to be assigned from a central BOOTP
server; if this option is set to es,” the hub will first look for a

BOOTP server to provide it with this information before using local
settings.

DFE-2600 Stackable Hub - TCP/IP Parameters Configuration Menu

Interface #<1 Media Type: Ethernet>

Current Setting
IP Address: 210.68.85.51
Subnet Mask: 255.255.255.0
Default Gateway: 210.68.85.126

System Restart Setting
IP Address [210.68.85.51 ]
Subnet Mask [255.255.255.0 ]
Default Gateway [210.68.85.126 ]

Send BootP Request Upon Power Up <No >

HELP SAVE EXIT

The default setting for all TCP/IP variables is 0 . 0.0.0.

Master Hub Setup and Management 47

Out-of-Band Management and Console
Settings

You can use the Out-of-Band/Console Setting menu to choose whether to use
the hub RS-232 serial port for console management or for out-of-band

TCP/IP communication using SLIP, and to set the baud rate used for SLIP
communications.

The following fields can be set:

♦ System Restart Out-of-Band Baud Rate

. This parameter determin­es the serial port baud rate that will be used the next time the hub is
restarted. It applies only when the serial port is being used for out-of­band (SLIP) management; it does not app ly when the port is used as a
console port. Available speeds are 1200, 2400, 9600, and 19200 bits
per second.

♦ Out-of-Band Dial Up Phone Number

. This information is stored as
a reference for the benefit of the system manager and does not cause
the hub to dial out.

♦ System Restart Serial Port Setting

. This parameter determines
whether the serial port should be used for out-of-band (SLIP) man­agement or for console management, starting from the next time the
hub is restarted. It can be set to either onsole” or ut-of-Band.”

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management48

DFE-2600 Stackable Hub - Out-of-Band/Console Setting Menu

Out-of-Band Setting Console Setting:

Protocol: SLIP
Baud Rate: 9600 Baud Rate: 9600
Character Size: 8 Character Size: 8
Stop Bit: 1 Stop Bit: 1

System Restart Out-of-Band Baud Rate
<9600 >
Out-of-Band Dial Up Phone Number
[]

Current Serial Port Set ting: Console
System Restart Serial Port Setting <Console >

HELP SAVE EXIT

Software Update on Boot

The hub is capable of obtaining its boot-time configuration information, as
well as updated versions of its internal firmware, using TFTP (the Trivial File
Transfer Protocol) and BOOTP (the BOOTstrap Protocol). You can use the
Software Update menu to control this feature.

The fields you can set on this menu are:

♦ Software Update

. This parameter determines whether or not the hub
will try to look for the configuration file over the network. If set to
Disable, the parameters below become irrelevant.

♦ Software Update M ode

. This variable can be set to either Network
or Out-of-band. Determines whether the configuration file should be
obtained through the Etherne t network or through the console port.

♦ Boot Protocol

. This parameter can be set to either TFTP ONLY or

BOOTP&TFTP. Applies only if the

S/W Update

control is enabled.

Master Hub Setup and Management 49

♦ Boot Server IP Address

. This variable is the IP addr ess o f the T FT P
server where the configuration file is located. This entry is used only if
the

S/W Update Control

is enabled and your boot protocol is TFTP

only; if you are using BOOTP&TFTP mode, or if

Send BOOTP Re-

quest on Power Up

is enabled, the address will be obtained from the

BOOTP server.

♦ Boot File Name

. The pathname of the configuration file on your
TFTP server. If you are using D-View as your TFTP server, this is
the pathname of the .CFG file on your hard disk. This entry is used
only if your boot protocol is TFTP ONLY; if you are using
BOOTP&TFTP mode, or if

Use BOOTP to get IP after start up

is en­abled, the pathname will be obtained from the BOOTP server. For
more information about the DFE-2600 series master hub configuration
file, see

Appendix C, Boot Configuration File.

DFE-2600 Stackable Hub - Software Update Menu

Software Update <Disable>
Software Update Mode <Network >

Boot Protocol <TFTP ONLY >
Boot Server IP Address [210.68.85.36 ]
Boot File Name [c:\dfe2600i.cfg ]
Last Boot Server IP Address: 210.68.85.35

HELP SAVE EXIT

SNMP Information

The System Configuration Menu scre en shows a var iety of information abo ut
your hub, and allows you to set the System Name, System Location, and
System Contact. These settings c an be retrieved from the hub using SNMP

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management50

requests, allo wing them to be used for ne twork management purposes. Each
of these fields is restricted to 64 characters:

♦ System Name

. This parameter corresponds to the MIB-II object

sysName,

and is used to assign a name to the hub for administrative

purposes . The hub domain name is often used, provided a name has
been assigned.

♦ System Location

. This parameter corresponds to the MIB-II object

sysLocation

, and is used to indicate the physical location of the hub

for administrative purposes.

♦ System Contact

. This parameter corresponds to the MIB-II object

sysContact

, and is used to note the name and contact information of

the person responsible for administering the hub.

♦ Display Timeout.

An additional setting, the console time-out, may be
used to automatically log out the console interface after a predetermined
period of inactivity. This feature increases hub security by preventing ac­cess to the hub after the interface has been inadvertently left logged on. A
setting of 0 disables this feature.

DFE-2600 Stackable Hub - System Configuration Menu

Mgmt Hardware Revision: Rev. 01
Boot PROM Firmware Version: Ver. 2.22
Software Version: Ver. 2.04
MAC Address: 0 080C80D308C

System Description:

D-Link Corp. DFE-2600 Dual Speed Stackable Hub SNMP/
System Name [ ]
System Location [ ]
System Contact [ ]

Console/Telnet Display Timeout in Min utes [60 ]

HELP SAVE EXIT

Master Hub Setup and Management 51

SNMP Traps

The hub sends out SNMP

traps

to network management stations whenever
certain exceptional events occur, such as when the hub is powered on or
when an SNMP request is made using an unknown community name. An
SNMP trap sent to another network management site provides a warning
about, for example, an attempted unauthorized access to the network or hub,
or changes to a network hub configuration that may effect other parts of

the network. Traps ar e sent only to selecte d network management hosts. T he
hub allows up to four different hosts to receive traps from the system.

DFE-2600 Stackable Hub - SNMP Trap Manager Setting Menu

IP Address SNMP Communi ty String Status
[ ] [ ] <Invalid>
[ ] [ ] <Invalid>
[ ] [ ] <Invalid>
[ ] [ ] <Invalid>

HELP SAVE EXIT

The following trap parameters can be set:

♦ IP Address

. This parameter specifies the IP address of the network

management station which will receive traps from the hub.

♦ SNMP Community String

. This parameter specifies the SNMP

community name to be included in the trap request.

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management52

♦ Status

. This determines whether this trap entry is valid or invalid.

You can delete an entry by changing its status to Invalid.

SNMP Security (Community Names)

SNMP (version 1) implements a rudimentary form of security by requiring
that each request include a community name. A community name is an arbi­trary string of characters used as a assword” to control access to the hub.

If the hub receives a request with a community name it does not recognize, it
will trigger an authentication trap, provided this feature has not been dis­abled.

The DFE-2600 series master hubs allow up to four different community
names to be defined, and the access rights for each community can be sepa­rately set to either read only or read/write. The status for each string can be
toggled to either valid or invalid. The community names

public

and

private

are defined by default; you can change these names in addition to adding
others. You will need to coordinate these names with the community name
settings you use in your network management system.

DFE-2600 Stackable Hub - SNMP Manager Setting Menu

SNMP Community String Access Right Status
[public ] <Read On ly > <Valid >
[private ] <Read/Write> <Val id >
[ ] <Read Only > < Invalid>
[ ] <Read Only > < Invalid>

HELP SAVE EXIT

Master Hub Setup and Management 53

Adding and Deleting Users

Access to the console program, whether using the diagnostic port or
TELNET, is controlled by user names and passwords. Up to three user
names can be defined . One user, named

D-Link

, is defined by default; this
user name can be removed if desired. However, the console program will not
let you delete the currently logged-in user to prevent you from accidentally
deleting all users with

Super User

privileges – making it impossible to

change important hub settings.
Only users with

Super User

privileges can add and delete users.

Add a User

To add a new user, perform these steps:

1.

Choose

User Account Change

from the main menu. The following

screen will appear:

DFE-2600 Stackable Hub - User Account Change Menu

Create New User
Change Access/Delete Users
Change Password

EXIT

2.

Choose

Create New User

from the User Ac count Change menu.

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management54

3.

Enter the new user name, and assign an initial password. Determine
whether the new user should have

Super User

or

General User

privi-

leges.

DFE-2600 Stack able Hub - User Accou nt Change : Create New User

User Name [ ]
Password [ ]
Confirm Passwo rd [ ]

Access Level <Super User >

HELP SAVE EXIT

4.

Choose

SAVE

and press

<Enter>

to let the user addition take effect.

5.

Choose

EXIT

to leave the Create New User menu.

Delete a User

To delete a user, follow these steps:

1.

Choose

User Account Change

from the main menu.

2.

Choose

Change Access/Delete Users

from the User Account Change

menu.

Master Hub Setup and Management 55

3.

Toggle the

Status

field of the user you wish to remove to N/A. (To

temporarily restrict a user access to the hub console, you can toggle
that user Status to

Inactive

.)

DFE-2600 Stackable Hub - User Account Change : Delete Users

User Name Access Level Status Delete
admin <Super User > < Active > <N/A>
D-Link <Super User > <Active > <No >

<N/A > <N/A > <N/A>

HELP SAVE EXIT

4.

Choose

SAVE

and press

<Enter>

to let the user deletion take effect.

5.

Choose

EXIT

to leave the Delete Users menu.

Primary/Backup Master

The Primary/Backup Master Hub screen, accessible from the Network
Monitoring menu, is used to display the stack management status of each
master hub in the stack. Fields in this screen are for information only and
cannot be changed. The group ID, primary/backup status, IP address, and
MAC address for master hubs in the stack are displayed.

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management56

DFE-2600 Stackable Hub - Network Monitoring : Pr imary/Backup Master Menu

Group ID Status IP Addr ess MAC Address
1 Primary Master 210.68.85.51 0080C8112202

EXIT

Hub Stack Management

Several important hub par ameters useful in the day-to-da y management of the
hub can be viewed and controlled using the Group Configuration and Port
State menus.

Controlling Hubs in the Hub Stack

The Group Co nfiguratio n Menu sc ree n, found und er the N etwork Mo nitori ng
menu, displays information about each of the hubs in the stack.

Note: In this context, roup” means ub.”

The items displayed on this screen are:

Master Hub Setup and Management 57

♦ Group ID

. This field indicates which hub is being displayed.

♦ Group Serial Number

. Displays the hub factory assigned serial

number.

♦ Group Posit ion Number

. Displays the hub stack position relative

to the other hubs (1 is the highest in the stack, 5 the lowest).

♦ Group Description

. This field gives a desc ription of the given hub,

showing its model number.

♦ Group Role

. Shows what role the hub is currently playing in the hub

stack (primary master, standby master, or slave).

♦ Group Port Capacity

. This field shows the total number of network

ports on the hub.

Note: When modules with additional ports are in-

stalled in DFE-2600 series hubs, the Port
Capacity number will automatically adjust to
reflect the added ports. The management
software does not discriminate, any type of
added or removed port will change the Port
Capacity number.

♦ Group Hardware Revision

. This field shows the design version of

the hub hardware.

♦ Group Master Revision

. Displays the design version for master

hubs.

♦ Group Status

. This field sho ws whether the hub is up-a nd -running o r

down.

♦ Group Last Oper Change

. This field shows the time when the hub

was last added to or removed from the stack. The format is

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management58

hh:mm:ss.xx, with hh representing hours since the master hub was
turned on, mm the minutes, ss the seconds, and xx representing 100ths
of a second.

♦ Group Slot (1)

. Shows the status of module slot 1. If there is a mod­ule installed in slot 1, this field will display: MII, TP, FX, o r Switch as
determined by the type of module installed. If there is no module in­stalled, the field will display one.”

♦ Group Slot (2)

. Shows the status of module slot 2. If there is a mod­ule installed in slot 2, this field will display: MII, TP, FX, o r Switch as
determined by the type of module installed. If there is no module in­stalled, the field will display one.”

♦ Group Isolate

. Provides control of the hub current network con-

nection status and allows the system manager to manually isolate a
particular hub as needed and reconnect it later. Toggling the field to

solate” separates the hub data connection from the other hubs.

Toggling the field to econnect” re-establishes the connection. See

egmenting Hubs” earlier in this chapter for more information.

DFE-2600 Stackable Hub - Network Monitoring : Group Configuration Menu

Group ID (1-5) [1]
Group Serial Number: 623000B
Group Position Number:
Group Description: DFE2624i
Group Role: Primary Master
Group Port Capacity: 24
Group Hardware Revision: Rev. 06
Group Master Revision: Rev. 01
Group Status: Up
Group Last Oper Change: 0:1:35.90
Group Slot (1): Switch
Group Slot (2): none

Group Isolate: <Rec onnect>

PREV GROUP NEXT GROUP HELP SAVE EXIT

Master Hub Setup and Management 59

You can use

PREV GROUP

and

NEXT GROUP

to display information

about another hub, or you can enter the hub Group ID number directly in
the Group ID field.

Controlling Individual Ports

The Port State Menu, accessible from the Network Monitoring menu, allows
you to view the status of individual ports and control their settings. The in­formation displayed includes:

♦ Group ID

. This field determines which hub ports are displayed.

♦ Port ID

. This field determines which port is displayed.

♦ Connector Type

. This field shows the port connector type.

♦ Link Test

. This field displays Up if there is a station connected to the

port; otherwise, it displays Down.

♦ Link Test State

. This field displays Enable if the port link status is

to be auto-detected and displayed, otherwise it displays Disable. This
variable is user configurable.

♦ Receive Polarity

. This field always displays Normal if the hub is op-

erating properly.

♦ Auto Partition

. This field displays Yes if the port has been auto mati­cally partitioned off from the rest of the network due to excessive
errors on the segment. The field displays No for normal operation.

♦ Admin State

. This toggle determines whether the port should be en­abled or disabled (manually partitioned). Setting the Admin State to
Disabled will isolate the port from the rest of the network. T his vari­able is user configurable.

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management60

♦ Port Speed

. This field displays the port current operating speed

(100M or 10M) relative to the speed of the device connected to it.

♦ Speed Capability

. This field displays the port current speed set-

ting, Auto for auto-detect/correct, 100M for 100Mbps connections
only, or 10M for 10Mbps connections only. This variable is user con­figurable.

DFE-2600 Stackable Hub - Network Monitoring : Port State Menu

Group ID(1-8) [1] Port ID(1- 24) [1 ]
Connector Type: UTP

Port Status Port State

Link Test: Up Link Test State: <En ab le >
Receive Polarity: Normal
Auto Partition: O n Admin State: <Enab le >
Port Speed: 100M Speed C apa bility: <Auto >

PREV GROUP NEXT GROUP PREV PORT NEXT PORT HELP SAVE EXIT

You can use

PREV GROUP

and

NEXT GROUP

to switch to another hub,

or

PREV PORT

and

NEXT PORT

to switch to another port. You can also

enter the port Group ID and Port ID numbers to go directly to a different
port.

Monitoring the Hub Stack

The hub supports several monitoring functions, allowing you to keep statis­tics on the operation of each port, each hub, and the entire network segment,
as well as to monitor the addresses of the packets received at each port.

Master Hub Setup and Management 61

Displaying Port and Group Statistics

The hub stack collects network transmission statistics for each port, and each
hub (group) in the stack. Statistics collected for segments are tabulated dif­ferently and are explained in the next section. You can choose which to view
from the Statistics menu, accessible under the Network Monitoring menu.

DFE-2600 Stackable Hub - Network Monitoring : Statistics Menu

Segment Statistics
Group Statistics
Port Statistics

EXIT

The data categories provided for both port and group statistics are the same.
They are:

♦ Frames Too Long

. This statistic counts frames longer than the 1518­byte (octet) limit set by the Ethernet standard. This problem is likely
caused by software errors.

♦ Very Long Events

. This statistic counts events where a signal is re­ceived that is longer than the jabber lo ckup protection timer setting. A
high count in this field may indicate noise on the line or a bad Ether­net interface.

♦ Short Events

. This statistic counts events where less than 10 bytes

are received and the frame start delimiter is invalid, or where the start

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management62

frame delimiter is valid but less than 2 bytes are received. This type
of error may indicate noise on the line.

♦ Late Events

. This statistic counts collisions that occur at or after the
64th byte (octet) in the frame. A high count here may indicate that
delays on your Ethernet are too long, and you have either exceeded
the repeater count or cable length specified in the Fast Ethernet stan­dard.

♦ Runt Frames

. This statistic counts frames shorter than the 64-byte
(octet) minimum defined by the Fast Ethernet standard. Runts are of­ten caused by collisions.

♦ Collisions

. This statistic counts collisions on the Ethernet segment.

♦ FCS Errors

. This statistic counts otherwise valid frames that fail the

CRC check.

♦ Alignment Errors

. This statistic counts otherwise valid frames that

did not end on a byte (octet) boundary.

♦ Readable Frames

. This statistic counts valid frames.

♦ Multicast

. This statistic counts the number of good multicast packets
received. Multicast events are messages sent from one node to multi­ple nodes on the segment.

♦ Broadcast

. This statistic counts the number of good broadcast pack­ets received. Broadcast events are messages sent to all nodes on the
segment.

♦ Auto Partitions

. This statistic counts events where the port was par­titioned off from the rest of the network due to excessive collisions or
cabling problems.

♦ DRM (Data Rate Mismatch)

. This statistic counts events where

there is a frequency mismatch between the received signal and the hub

internal clock. A high count in this field may indicate a hardware

problem in the hub or in an Ethernet interface.

Master Hub Setup and Management 63

♦ SA Changes

. This statistic counts the number of times the source ad -

dress has changed.

♦ Isolates

(only for 100Mbps connections). Counts the number of times

a port auto isolates.

♦ SymbolError

(only for 100Mbps connections). Counts the number of
times a received packet contained symbol errors. Only one symbol er­ror is counted per packet regardless of the number of symbol errors
within the packet.

♦ Total Errors

. This statistic is the sum of the FCS Error, Alignment
Error, Too Long Frame, Short Event, Late Event, Very Long Event,
and Data Rate Mismatch counters.

♦ Readable Octs

. This statistic counts the total number of bytes (oc-

tets) included in valid (readable) frames.

DFE-2600 Stackable Hub - Network Monitoring : Port Statistics

Current Group ID: 1 Current Port ID: 9

Pkts Pkts/Sec Pkts Pkts/Sec
Frames Too Long: 0 0 Readable Frames: 484447 0
Very Long Events: 0 0 Multicast: 7393 0
Short Events: 0 0 Broadcast: 305460 0
Late Events: 0 0 Auto Partition: 0 0
Runt Frames: 2632 0 DRM: 0 0
Collision: 8514 0 SA Changes 319965 0
FCS Errors: 395 0 Isolates: 0 0
Alignment Errors: 9 0 SymbolError: 0 0

Errs Errs/Sec Octs Octs/Sec
Total Errors: 404 0 Readable Octs: 105350920 0

Next Monitoring Group ID [1]
Next Monitoring Port ID [9 ]

PREV GROUP NEXT GROUP PREV PORT NEXT PORT CLEAR COUNTER EXIT

You can use

PREV GROUP, NEXT GROUP, PREV PORT,

and

NEXT

PORT

to switch hubs or ports.

CLEAR COUNTER

resets all counters

back to zero.

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management64

NOTE:

The CLEAR COUNTER action only resets the
counters for the statistics display; the underly­ing counters (i.e., MIB variables) are not
cleared.

Displaying Segment Statistics

The hub stack collects network transmission statistics for each segment in the
stack. You can choose to view them from the Statistics menu, accessible
under the Network Monitoring menu.

♦ StatsPkts.

This statistic displays the number of packets received from

the network, including error packets.

♦ BroadcastPkts

. This statistics counts the number of good broadcast

packets received on the segment.

♦ MulticastPkts.

This statistics counts the number of good multicast

packets received on the segment.

♦ CRCAlignErrors

. This statistic counts the number of valid length
packets (64 to 1518 bytes) that had a bad Frame Check Sequence
(FCS).

♦ UndersizePkts.

This statistic counts the number of well-formed

packets that were smaller than 64 octets.

♦ OversizePkts

. This statistic counts the number of well-formed pack-

ets that were longer than 1518 octets.

♦ Fragments

. This statistic counts the number of ill-formed packets
less than 64 octe ts and all events without a star t-of-fr ame delimite r r e­gardless of their length.

♦ Jabbers

. This statistic counts the number of jabber events on the

segment.

Master Hub Setup and Management 65

DFE-2600 Stackable Hub - Network Monitoring : Seg ment Statistics

Current Segment ID: 1

Pkts Pkts/Sec Pkts Pkts/Sec
StatsPkts: 474996 0 64 Octs: 51790 0
BroadcastPkts: 284057 0 65-127 Octs: 114508 0
MulticastPkts: 6884 0 128-255 Octs: 215763 0
CRCAlignErrors: 47 0 256-511 Octs: 12529 0
UndersizePkts: 0 0 512-1023 Octs: 4197 0
OversizePkts: 0 0 1024-1518 Octs: 75747 0
Fragments: 677 0
Jabbers: 1 0
Collisions: 673 0

Octs Octs/Sec
StatsOctets: 187814091 0
Total Octs: 191996500 0

Next Monitoring Segment ID [1]

PREV SEG NEXT SEG CLEAR COUNTER EXIT

♦ Collisions

. This statistic counts the number of collisions on the seg-

ment .

♦ 64 Octs

. This statistic displays the number of packets (both good and

bad) that were 64 octets long.

♦ 65-127 Octs.

This statistic displays the number of packets (both good

and bad) that were 65 - 127 octets long.

♦ 128-255 Octs.

This statistic displays the number of packets (both

good and bad) that were 128 - 255 octets long.

♦ 256-511 Octs.

This statistic displays the number of packets (both

good and bad) that were 256 - 511 octets long.

♦ 512-1023 Octs.

This statistic displays the number of packets (both

good and bad) that were 512 - 1023 octets long.

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management66

♦ 1024-1518 Octs.

This statistic displays the number of packets (both

good and bad) that were 1024 - 1518 octets long.

♦ StatsOctets.

This statistic displays the number of data octets includ­ing those in bad packets and octets in FCS fields but does not include
preamble or other framing bits.

♦ Total Octs.

This statistic displays the total number of octets contained

in valid frames received on this segment.

Node Tracking

The Node Tracking screen displays the origination MAC addresses of pack­ets received by each node connected to the hub for the last 12 receives.

DFE-2600 Stackable Hub - Network Monitoring : No de Tracking Informati on

Group ID: 1 Port ID: 1

Source MAC Source MAC

PREV GROUP NEXT GROUP PREV PORT NEXT PORT EXIT

Group and port can be selected by entering the appropriate number(s) in the
Group ID and P ort I D field s o r using the na vigation c ommands at the bo ttom
of the screen.

Master Hub Setup and Management 67

Per-Port Intrusion Security

Each port on this hub can have intrusion security enabled. Intrusion security
prevents unauthorized individuals from accessing the network. Through the
network management software, Ethernet addresses that represent authorized
users can be assigned to each hub port. If a packet using a source address
other than those used by authorized users is received by a port, the port is
disabled and the network manager is notified.

Bridge Information

The bridge information screen allows the network administrator to view the
install and operation status of all bridging modules within a segment. To
avoid non-terminating network data loops, only one bridging module at a
time can be active. The hub stack management software always enables the
module installed in the highest hub in the stack. The management program
can only test for the presence or absence of an installed bridge and not
whether it is functional. Under the Bridge Present column, /A” indicates

no bridging module present in that hub.

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management68

DFE-2600 Stackable Hub - Network Monitoring : Br idge Information

Hub ID Bridge Present Bridge Status

1 Bridge Enable
2 N/A Disable
3 N/A Disable
5 N/A Disable

EXIT

Resetting the Hub

You can use the console program to reset the hub stack, either doing a system
reset (which restarts the hubs and is identical to powering them off and back
on again) or a factory reset (which resets the master hub, reverts all of its
parameters back to their factory default values, and restarts the entire hub
stack).

Important Note: If it is necessary for you to power-off

the hub (or hub stack) and then re­start it instead of using the reset
functions, the hub MUST BE
POWERED-OFF for a MINIMUM of
TEN SECONDS.

Master Hub Setup and Management 69

If the hub stack has a backup master, the time required to complete the reset
process will be longer than without one. Generally, a stack reset should be
complete within about two minutes.

System Reset

To perform a system reset, follow these steps:

1.

Choose

System Reset

from the main menu. The following confirma-

tion message will appear:

DFE-2600 Stackable Hub - System Reset

Are you sure you want to reset? No Yes

2.

Move the cursor to

Yes

to confirm the reset and press

<Enter>.

After a few seconds delay, the hub should restart.

Factory Reset

Before performing a factory reset, be absolutely certain that this is what you
want to do. Once the reset is done, all of the master hub stored settings

Dual-Speed Stackable Hubs User’s Guide

Master Hub Setup and Management70

(including TCP/IP parameters, SNMP parameters, the enabled/disabled set­tings of ports, etc.) will be erased and restored to their factory default
settings.

1.

Choose

Factory Reset NVRAM to Default Value

from the main
menu. A confirmation message similar to that for the System Reset
will appear.

2.

Move the cursor to

Yes

to confirm the reset and press

<Enter>.

After a few seconds delay, the hub should restart, and all of its
parameters will revert to their default values.

Note: Doing a factory reset to the Primary Master al-

so resets the Backup Master variables except
for the the Backup Master IP address.

Web-Based Network Management 71

6

6 W

EB

-B

ASED

N

ETWORK

M

ANAGEMENT

Introduction

The content of this chapter pertains to intelligent (master) hub models only.
These hubs have the ’ designatio n in their model numbers and inc lude the

DFE-2616i, DFE-2616ix, DFE-2624i and the DFE-2624ix.
An embedded web-based (hypertext) interface allows users to manage the

hub from anywhere on the network through a stand ard browser such as Ne t­scape Navigator/Communicator or Microsoft Internet Explorer. The
web-browser acts as a universal access tool and can communicate directly
with the Hub using HTTP protocol. Your web-browser screen may vary with
the screen-shots (pictures) in this guide.

NOTE:

This Web-based Management Module does not accept Chinese
language input (or other languages req uiring 2 bytes per chara c­ter).

Dual-Speed Stackable Hub Web-based Management User’s Guide

Web-based Network Management72

Getting Started

The first step in ge tting sta rte d in using web-ba sed management fo r your H ub
is to secure a web-browser. A web-browser is a program which allows a per­son to read hypertext, for example, Netscape Navigator or Microsoft Internet
Explorer. Follow the installation instructions for the browser.

The second and last step is to configure the IP interface of the Hub. This can
be done manually through a conso le (see the

In-Band Setup Instructions

on

page 39) or defined in the Boot Configuration File (see Appendix B).

Management

To begin managing your hub stac k simply run the web browser you have in­stalled on your computer and open the IP address you have defined for the
master hub.

In the page that opens, click on the

Login to DFE-2600 series Web-based

Management

button. This opens the main page in the management module.

The top of the main page has a button labeled

Click Here to Load Panel

.

Clicking on this button causes an interactive view of the hub stack front
panel to be shown in the top portion of the window. The three interactive

features of this interactive hub stack (which can also be found in the

Fault -

Group/Port Control

menu option) are described below:

•

Hub ID

Web-Based Network Management 73

Clicking on the Hub ID indicator shows information about the
hub and allows you to take it offline.

•

Slots 1 & 2

Clicking on one of the Slot indicators, if it is occupied by a fiber
optic or Fast Ethernet expansion module or console, shows a
status and configura tion window for that device.

•

Port

Clicking on one of the P orts opens a configuration window for
that particular port.

Individual items in the above mentioned configuration windows are discussed
in the

Fault - Group/Port Control

section below.

The main page contains a list of buttons along the top of it labeled:

Configu-

ration, Performance, Fault, User, RMON

and

Help

. These are the major
categories for hub management. Clicking on one of the categories causes a
list of options to appear on the left side of the main window.

All categories and options are explained below.

Configuration

This is the first (left-most) category and is opened by default when you Login
to the Web Management program. The Configuration options are listed be­low along with explanations for each one.

Information

The information screen provides the hardware, firmware, and software profile
of the hub. The values displayed with a white background can be
user-defined or list-selected by user.

Dual-Speed Stackable Hub Web-based Management User’s Guide

Web-based Network Management74

Items in the Hub Information window are described as follows:

♦ System Description

A description of the hub type.

♦ System OID

The SNMP Object Identifier for this hub type.

♦ System Uptime

The amount of time that the hub stack has been pow-

ered on.

♦ System Contact

Name of the person to contact should there be any

problems / questions with the system.

♦ System Name

A user-assigned na me for the hub.

♦ System Location

A user-assigned description for the physical location

of the hub.

♦ Runtime Software Version

Version number for the resident and

downloadable software.

♦ PROM Firmware Version

Version number for the firmware chip.

This information is needed for new Runtime Software downloads.

Web-Based Network Management 75

♦ Hardware Revision

Revision number for the hub hardware.

IP Interface

The IP Interface screen displays information about each interface to the de­vice.

The information is described as follows:

♦ IP Address

The Internet address for the device.

♦ Subnet Mask

The subnet mask determines the level of the subnet that

the hub is on.

♦ Default Gateway

The default router for the device.

♦ MAC Address

The ethernet address for the device.

♦ Interface Type

The media protocol.

Dual-Speed Stackable Hub Web-based Management User’s Guide

Web-based Network Management76

Trap Receivers

Defining Trap Receivers allows network management stations to be notified
when exceptional events happen.

♦ IP Address

This is the address of the network station that sho uld re-

ceive traps from the hub stack.

♦ Community

This is the SNMP community name to authenticate the

receiving of traps.

♦ Delete

This will remove a trap receiver from the trap receiving table.

To add a Trap Receiver to the list, simply type the IP Address and Commu­nity Name in the appropriate boxes and click on the Add button.

SNMP Manager Configuration

The SNMP Manager Configuration screen allows you to define community
strings and access privileges.

Web-Based Network Management 77

♦ Community String

A user-defined SNMP community name.

♦ Access Right

The permitted access using the SNMP community name.

♦ Delete

Click this to delete the community name.

Software Download

The Software Download screen allows you to cause an immediate update of
the hub parameters and/ or firmware.

Dual-Speed Stackable Hub Web-based Management User’s Guide

Web-based Network Management78

The fields are described as follows:

♦ Software Update Mo de

Set to either

network

or

out-of-band

. Deter­mines whether the configuration file should be obtained through the
Ethernet network or through the console port.

♦ Software Update Control

Determines whether or not the Hub should

download its configuration file the next time the Hub is booted.

♦ Boot File

The path and configuration file name on the TFTP server. If

you are using bootp-tftp mode, or if

Get IP From BOOTP Server

is en-

abled, the pathname will be obtained from the BOOTP server.

♦ Boot Server Address

The IP address of the TFTP server where the

configuration file is located.

♦ Boot Protocol

Set to either bootp-tftp or tftp

only

. Applies only if the

Software Update Control

is enabled.

♦ Get IP From Bootp Server

If enabled, the IP address will be obtained

from the BOOTP server.

Web-Based Network Management 79

Performance

Hub performance is measured with packet statistics and it utilization in the
network. Clicking on the Performance button and then choosing either the

Statistics or Utilization optio ns on the left causes a representation of your hub
to be shown (see example below). Click on any feature of the representation
to see Statistics or Utilization figures about it.

Statistics

The Hub allows you to collect network statistics on individual ports, 10 Mbps
segments (Seg. 1), 100Mbps segments (Seg. 2) and any Hub in the stack by
clicking on the hub ID number.

Dual-Speed Stackable Hub Web-based Management User’s Guide

Web-based Network Management80

Statistics collected by the Hub are described as follows:

♦ StatsPkts (Pkts)

Counts valid frames.

♦ BroadcastPkts (Pkts)

Counts valid frames that are broadcast to all

stations on the network.

♦ MulticastPkts (Pkts)

Counts valid frames that are sent to multicast

Ethernet addresses.

♦ CRC AlignErrors (Pkts)

Counts otherwise valid frames that did not

end on a byte (octet) boundary.

♦ UndersizePkts (Pkts)

Counts packets received that were less than 64
octets long (excluding framing bits, b ut including FCS octets) and were
otherwise well formed.

Web-Based Network Management 81

♦ OversizePkts (Pkts)

Counts packets received that were longer than
1518 octets (excluding framing bits, but including FCS octets) and were
otherwise well formed.

♦ Fragments (Pkts)

Counts packets received that were less than 64 oc­tets in length (excluding framing bits but including FCS octets) and had
either a bad Frame Check Sequence (FCS) with an integral number of
octets (FCS Error) or a bad FCS with a non-integral number of octets
(Alignment Errors).

♦ Jabbers (Pkts)

Counts frames longer than the maximum 1518 bytes

(octets) with either bad framing or an invalid CRC.

♦ Collisions (Pkts)

Counts transmission collisions on the Ethernet seg-

ment .

♦

The Hub also collects packet distribution statistics categorizing Ethernet
frames by length:

• 64 Octs (Pkts)

• 65-127 Octs (Pkts)

• 128-255 Octs (Pkts)

• 256-511 Octs (Pkts)

• 512-1023 Octs (Pkts)

• 1024-1518 Octs (Pkts)

♦ StatsOctets (Octs)

The number of data octets including those in bad
packets and octets in FCS fields, but does not include preamble or other
framing bits.

♦ TotalOctets (Octs)

The number of octets contained in valid frames.

Dual-Speed Stackable Hub Web-based Management User’s Guide

Web-based Network Management82

Utilization

A network segment can be monitored using the Utilization display. Each hub
is divided into two segments; 100Mbps (segment 1) and the 10Mbps (seg­ment 2). When you choose a segment to observe, a graph appears showing
the usage of that segment as a percentage of the total bandwidth (see example
below).

Utilization is calculated and plotted every 10 seconds. A one hour utilization
history can be shown by the graph.

Fault

The operations describ e d in this section allow you to manage the Hub while it
is operating.

Web-Based Network Management 83

Group/ Port Control

Click on the

Group/Port Control

button on the left side of the screen to show
your hub or stack on the screen. On the stack, simply click on any item you
wish to configure, including an ind ividua l p or t, a hub ( by clicking o n the H ub
ID number), the console and the switch (see the example below).

Port Configuration

Clicking on any twisted-pair port will show the current configuration infor­mation of the port.

Dual-Speed Stackable Hub Web-based Management User’s Guide

Web-based Network Management84

♦ Port Type

This is a is UTP port which supports both UTP and STP

cabling.

♦ Link Status

Indicates whether the port is online and working (

link up

)

or not (

link down

).

♦ Auto Partition Status

Indicates whether the port has been

auto-partitioned and taken offline or not.

♦ Speed

Indicates the port speed:

100Mbps

or

10Mbps

.

♦ Polarity Status

Indicates the polarity status:

normal

or

reversed

.

♦ Link Test Function State

Indicates whether the port link-test is

en-

abled

or

disabled

. If enabled, the port will check for link pulses, and

will only transmit if there is a good link to another station.

♦ Administration State

Indicates the port partition status, either

en-

abled

or

disabled

.

♦ Port Speed State

Indicates how the port speed is set:

Auto-

Negotiation

(NWay enabled),

10Mbps

, or

100Mbps

.

Web-Based Network Management 85

♦ Generate Trap When Link State Change

Indicates whether or not

the port will send a trap if it link status changes.

♦ Generate Trap When Speed State Change

Indicates whether or not

the port will send a trap if it speed changes.

Group (Hub) Configuration

Clicking on a Hub ID number will show the current configuration informa­tion for that Hub.

Information displayed on this screen includes:

♦ Serial Number

This is a unique hardware serial number of the Hub.

♦ Description

Information about the hub.

♦ Slot 1/ Slot 2 Type

These indicate the type of module, if present, in

the back-slot of the Hub.

♦ Repeater Type

Detailed information about the Hub.

Dual-Speed Stackable Hub Web-based Management User’s Guide

Web-based Network Management86

♦ Group Role

The role of the Hub within the stack, either pri-

mary-master, backup-master, or slave.

♦ Hardware Revision

The version of the repeater hardware board used

in this Hub.

♦ Status

Tells whether the Hub is up (online and working) or

down

.

♦ Last Operation Status Change

Time of the last status change for the

Hub. A status change occurs when the Hub goes online or offline.

♦ Isolated/ Reconnected Group

This is an option to isolate or reconnect

the Hub to the hub stack.

Out-of-Band/ Console Configuration

Clicking on the word

Console

which will appear on the representation of the

hub stack if a console is present, allows the Hub diagnostic port to be con­figured. The diagnostic po rt can be set to

Console

(in-band) for VT-100

and terminal emulation which may be necessary for basic configurations and
initial setup, or to

out-of-band

management which enables the hub to be

managed using SNMP via the diagnostic port.

Web-Based Network Management 87

The information is described as follows:

♦ Current Serial Port Setting

Displays the current setting, either

Con-

sole

or

Out-of-band

.

♦ System Restart Serial Port Setting

You can choose to select

Console

or

Out-of-band

management upon reboot.

♦ Baud Rate

Defined in cps (characters per second), it shows the con-

nection speed between the Hub and the console.

♦ Character Size

This is the number of bits in the byte unit of the in-

formation exchange between Hub and console manager.

♦ Stop Bit

This bit marks the end of a unit of transmission (normally a

byte or character).

Dual-Speed Stackable Hub Web-based Management User’s Guide

Web-based Network Management88

♦ Protocol

This is the protocol used by the Hub for out-of-band (dial-up)

management.

♦ System Restart Out-of-Band Baud Rate

This sets the baud rate (cps)

on the Hub.

♦ Out-of-Band Dial Up Phone Number

Administrator can place num-

ber here for reference.

Module Port (Slots 1&2) Configuration

When slots 1 or 2 are occupied by either a DFE-260FX Fiber Optic Module
(shown on the graphic representation of the hub as SwFx) or a DFE-260TX
Fast Ethernet Module (SwTp), clicking on the words SwFx or SwTp causes
the following configuration screen to be shown.

Information displayed includes:

♦ Port Type

This item shows either

Sw-Tx

for a Fast Ethernet module

or

Sw-Fiber

for the Fiber Optic module.

♦ Link Status

Indicates link status: online and running (

link up

) or not

(

link down

).

♦ Speed

Indicates the port speed:

100Mbps

or

10Mbps

.