Compaq Netelligent 2724 User manual

©1997 Compaq Computer Corporation.All rights reserved.
Compaq Registered U.S.Patent andTrademark Office.
Company and product names mentioned herein may be
trademarks and/or registered copyright and trademarks of
their respective companies.
Netelligent 2724/2824
Dual-Speed Hubs
User Guide

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NOTICE
The information in this publication is subject to change without notice.
COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL OR
EDITORIAL ERRORS OR OMISSIONS CONTAINED HEREIN, NOR FOR INCIDENTAL OR
CONSEQUENTIAL DAMAGES RESULTING FROM THE FURNISHING, PERFORMANCE, OR
USE OF THIS MATERIAL.
This publication contains information protected by copyright. No part of this publication may be
photocopied or reproduced in any form without prior written consent from Compaq Computer
Corporation.
The software described in this guide is furnished under a license agreement or non-disclosure agreement.
The software may be used or copied only in accordance with the terms of the agreement.
Product names mentioned herein may be trademarks and/or registered trademarks of their respective
companies.
1997 Compaq Computer Corporation.
All rights reserved. Printed in the U.S.A.
Compaq
Registered United States Patent and Trademark Office.
Netelligent is a trademark of Compaq Computer Corporation.
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
First Edition (June 1997)
Part Number 299440-001

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Federal Communications Commission Notice
Part 15 of the Federal Communications Commission (FCC) Rules and Regulations has established
Radio Frequency (RF) emission limits to provide an interference-free radio frequency spectrum. Many
electronic devices, including computers, generate RF energy incidental to their intended function and
are, therefore, covered by these rules. These rules place computers and related peripheral devices into
two classes, A and B, depending upon their intended installation. Class A devices are those that may
reasonably be expected to be installed in a business or commercial environment. Class B devices are
those that may reasonably be expected to be installed in a residential environment (i.e., personal
computers). The FCC requires devices in both classes to bear a label indicating the interference
potential of the device as well as additional operating instructions for the user.
The rating label on the device shows which class (A or B) the equipment falls into. Class B devices
have an FCC ID on the label. Class A devices do not have an FCC ID on the label. Once the class of
the device is determined, refer to the following corresponding statement.
Connections to the serial COM port on this device must be made with shielded cables with metallic
RFI/EMI connector hoods in order to maintain compliance with FCC Rules and Regulations.
NOTE: If this equipment contains a Token Ring interface, this equipment is a Class A digital device
when the Token Ring interface is utilized.
Class A Equipment
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 the instructions, 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 personal expense.
Modifications
The FCC requires the user to be notified that any changes or modifications made to this device that are
not expressly approved by Compaq Computer Corporation may void the user's authority to operate the
equipment.

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Canadian Notice
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment
Regulations.
Avis Canadien
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel
brouilleur du Canada.
European Union (EU) Notice
Products with the CE Marking comply with both the EMC Directive (89/336/EEC) and the Low Voltage
Directive (73/23/EEC) issued by the Commission of the European Community.
Compliance with these directives implies conformity to the following European Norms (in brackets are
the equivalent international standards):
■EN55022 (CISPR 22) - Electromagnetic Interference
■EN50082-1 (IEC801-2, IEC801-3, IEC801-4) - Electromagnetic Immunity
■UL 1950, Third Edition; CAN/CSA C22.2 No. 950-95, July 1995; TUV Rheinland
EN 60950; and 1988 + A1/1990+A2/1991 - Product Safety

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Japanese Notice
Fiber Port Class 1 Classification
Compaq fiber ports have been tested in accordance with the IEC 825-1 test standard and found to meet
the Class 1, intrinsically eye-safe emitter classification.
Product Label
CLASS 1 LED
KLASSE 1 LED
The fiber ports on this product have been tested in accordance with the
IEC 825-1 Test Standard and found to meet the Class 1, intrinsically
eye-safe emitter classification.

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Lithium Battery
The non-volatile RAM (NVRAM) chip on the motherboard of the Netelligent 2824 hub contains a non-
replaceable lithium battery. Only trained service personnel should dispose of this chip.
La puce mémoire non volatile contient une pile au lithium non remplaçable. L'élimination de cette
puce devrait être confieé à un personnel qualifié.

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Contents
Chapter 1
Overview
Features.........................................................................................................................1-2
Package Contents..........................................................................................................1-4
Hub Components ..........................................................................................................1-5
RJ-45 Ports ............................................................................................................1-5
Smart Uplink Slot..................................................................................................1-5
LED Indicators ......................................................................................................1-6
Serial COM Port....................................................................................................1-8
Host/Target DIP Switch ........................................................................................1-9
Managed/Unmanaged DIP Switch ......................................................................1-10
Internal 10/100 Switch Disable DIP Switch........................................................1-10
10 ONLY - 10/100 Switch ..................................................................................1-10
10 MDI - 10/100 MDI-X Switch.........................................................................1-11
Segmentation ..............................................................................................................1-12
Chapter 2
Planning Installation
Installation Requirements.............................................................................................2-1
Environmental Requirements................................................................................2-1
Electrical Requirements.........................................................................................2-1
Spatial Requirements.............................................................................................2-2
Cable Requirements...............................................................................................2-2
System Planning Charts................................................................................................2-5

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Chapter 3
Installing the Hub
Mounting the Hub.........................................................................................................3-1
Attaching the Rubber Feet.....................................................................................3-1
Rack-Mounting the Hub........................................................................................3-1
Installing a Smart Uplink Module ................................................................................3-3
Inserting the Smart Uplink Module into the Smart Uplink Slot............................3-3
Connecting Cable..........................................................................................................3-5
Interconnecting Hubs....................................................................................................3-6
Connecting Power.......................................................................................................3-10
Disconnecting Power...........................................................................................3-11
Connecting to the Serial Port......................................................................................3-11
Chapter 4
Configuring the Hub for Management
Setting the IP Address Using VT100............................................................................4-1
Setting the IP Address Using a BOOTP Server............................................................4-7
Chapter 5
Managing the Hub
Management Features...................................................................................................5-1
Management Interface ..................................................................................................5-1
SNMP Management......................................................................................................5-3
Supported MIBs.....................................................................................................5-3
Supported Frame Types.........................................................................................5-3
IP Frame Types......................................................................................................5-4
IP Protocols ...........................................................................................................5-6
IPX Frame Type ....................................................................................................5-7
IPX Protocols.........................................................................................................5-9
SLIP Protocols.....................................................................................................5-10

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Traps....................................................................................................................5-11
RMON Support...........................................................................................................5-13
Statistics Group....................................................................................................5-13
History Group......................................................................................................5-14
Alarm Group........................................................................................................5-15
Event Group.........................................................................................................5-16
Firmware Updates.......................................................................................................5-17
Download Problems ............................................................................................5-18
Parameters Stored in NVRAM...................................................................................5-19
Compaq Specific Parameters......................................................................................5-20
Appendix A
Specifications
Physical........................................................................................................................A-1
Electrical......................................................................................................................A-1
Environmental..............................................................................................................A-1
Appendix B
Using the VT100 Interface
Connecting the Hub for VT100................................................................................... B-1
Setting Up the Communications Program.................................................................. B-1
Starting the VT100 Interface....................................................................................... B-2
Basic Update Fields.............................................................................................. B-4
VT100 Management Options....................................................................................... B-5
Displaying a Data Screen............................................................................................. B-6
Navigating the VT100 Screens.................................................................................... B-6
Viewing System Information....................................................................................... B-8
Viewing the Management Agent Configuration........................................................ B-10
Viewing Port Statistics .............................................................................................. B-12
Viewing the Stack Configuration .............................................................................. B-13
Viewing and Editing the Backup Port Configuration................................................ B-15

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Changing the Password.............................................................................................. B-17
Downloading Firmware............................................................................................. B-19
Setting Up the Serial Port.......................................................................................... B-21
Configuring User Access........................................................................................... B-23
Configuring IP User Access............................................................................... B-24
Configuring IPX User Access ............................................................................ B-28
Logging Out of the Management Session................................................................. B-30
Index

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Chapter 1
Overview
The Netelligent 2724 and 2824 Dual-Speed hubs feature a 10Base-T and a
100Base-TX repeater in each unit connected by an internal two-port 10/100
Mb/s switch. Each of the hubs’ 24 RJ-45 ports automatically detects and adjusts
to 10 Mb/s or 100 Mb/s port connection speeds. This makes the hub a perfect
solution for networks migrating from 10 Mb/s to 100 Mb/s, allowing you to
move from 10 Mb/s to 100 Mb/s speeds on a port-by-port basis. The 100 Mb/s
repeater is a 100Base-TX Class I repeater.
The 2824 hub is a managing hub, which means it contains a built-in
management agent.
The 2724 hub is a manageable hub, which means it does not contain a
management agent but can be managed by a hub that does contain a
management agent (2624 or 2824 hub, provided they are running v2.0 or higher
management firmware). To be managed by a managing hub, the 2724 must be
connected to a managing hub’s connectors on its back panel. Up to five hubs
(one managing 2824 or 2624 and four manageable 2524 or 2724) can exist in a
single stack for a total of up to 125 ports (with SUMs installed).

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Overview
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Features The 2724/2824 hub provides the following set of features:
24 RJ-45 ports allows 10 Mb/s or 100 Mb/s connections by autodetecting
the wire speed.
Stackable lets you stack up to five hubs (four manageable 2724 hubs and
one managing 2824 hub) for up to 125 workstation connections. You can also
interconnect the 2724/2824 hubs with Netelligent 2524/2624 hubs.
Host/Target Design allows manageable hubs (Model 2724) to be managed
by a single managing hub (Model 2824)
24 Bi-Colored LED Indicators show port activity, port link, and port
disable/auto partition; other LEDs show collisions, the power supply status, and
the management status of the hub and the mode (10 or 100).
Backup Ports provide redundant port connections for mission-critical
applications (for example, order entry PCs connected to a file server).
Intrusion Detection provides a method of preventing unauthorized stations
from transmitting on the network.
Field-Upgradable Firmware lets you upgrade the 2824 hub firmware using
XMODEM and TFTP downloads via the BOOTP/TFTP sequence, the VT100
interface, or through SNMP. VT100 and SNMP can occur through both in-band
and out-of-band (SLIP) connections.
4-group RMON (Groups 1, 2, 3 & 9) allows remote monitoring and
gathering of network statistics without generating network traffic.
Compaq Netelligent Management Software provides an easy-to-use
graphical interface for managing the hub.
SNMP management over IP and IPX lets you monitor and manage the
hub via any industry-standard SNMP application, such as Compaq Netelligent
Management Software (provided at no extra charge with each unit).
VT100 interface allows out-of-band (serial port) and in-band (Telnet)
management for setting numerous configuration parameters.

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Rack Mount Kit lets you install the hub in a standard EIA 19-inch
equipment rack.
10/100 Switch Enable/Disable lets you enable or disable the internal 10/100
switch if the network uses an external bridge or router.
Multicast/Broadcast Filtering allows the hub to forward or block multicast
and broadcast packets independently on both the 10 and 100 Mb/s segments.
Statistics Separate statistics, similar to those available on the 10 and 100
Mb/s repeater ports, are available for both the 10 and 100 Mb/s ports on the
2-port 10/100 switch.
Smart Uplink Module Support allows the 2724/2824 hub to uplink to
another 2724/2824 hub to overcome the single repeater hop restriction for
Class I 100Base-T repeaters.
IP/IPX Autodiscovery allows the hub to be autodiscovered by network
management platforms such as Novell ManageWise, HP OpenView, SunNet
Manager, IBM NetView 6000.
Fast Ethernet Wiring Standards ensures compatibility with all types of
UTP cabling.
Three-Year Limited Warranty

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Package Contents
Before you start to install the hub, verify that this package contains the
following items:
■Netelligent 2724 or 2824 Dual-Speed Hub
■AC power cord
■Rack-mounting kit (two mounting brackets, eight 3/8-inch bracket
screws, and four 1/2-inch rack-mount screws)
■Four adhesive-backed rubber feet
■Compaq Netelligent Management Software
■Compaq Netelligent 2724/2824 Dual-Speed Hub Quick Install Guide
■Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide CD
■Safety compliance guide
■Registration card
Figure 1-1. Package Contents

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Hub Components
This section provides an overview of the hub's components including the LED
indicators, RJ-45 ports, and fiber ports. Figure 1-2 shows the hub’s front panel.
Figure 1- 2. 2724/2824 Hub Front Panel with Smart Uplink Module Installed
RJ-45 Ports
The hub’s RJ-45 ports allow connections to UTP cabling to workstations and
servers in a 10Base-T or 100Base-TX network. The hub automatically detects
the wire speed and adjusts accordingly. You can force Port 1 to run at 10 Mb/s
by setting the 10 Mb/s ONLY / 10/100 switch on the front panel to 10 ONLY.
You can also use Port 1 as an uplink port by setting the MDI / MDI-X switch to
the MDI position. See “MDI / MDI-X Switch” and “10 Mb/s ONLY / 10/100
Switch” for more information.
Smart Uplink Slot
The Smart Uplink slot houses an optional Smart Uplink Module (SUM), which
serves as a connection point between hubs, hub stacks, and other manufacturers'
100Base-TX, 100Base-TX(SC), 100Base-TX(ST) hubs or stacks. Smart Uplink
modules let you extend your network without the usual repeater hop limitations
inherent with Class I repeaters.

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Overview
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Figure 1- 3. Smart Uplink Modules
The SUM provides two status LEDs: activity and collision. The activity LED is
a solid green when the link is active and flashes green when there is activity on
the port. The collision LED flashes yellow when a collision is detected and
lights solid yellow when the port is disabled. The collision LED does not reflect
conditions at the SUM’s hub port, only at the external interface port.
LED Indicators
The LED panel of the 2724/2824 hub helps you monitor the hub’s operation.
When you power on a hub, it performs a power-on self test (POST) which lasts
about 1 minute. After the POST, all LEDs reflect the current operational modes
which are described in Table 1-1.
Figure 1- 4. Hub Status LEDs

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Table 1-1
2724/2824 LEDs
LED Status and Description
POWER Green The power supply is operating properly.
Off The hub is not powered on.
STATUS 2824 Managing Hub:
Off A basic failure occurred where the firmware agent cannot execute code
or the LED control cannot be accessed
Yellow The firmware agent is in the process of booting up and is not ready
for management processing.
Flashing Yellow The firmware encountered a failure during the POST. The
LED is yellow for one second and off for one second.
Flashing Yellow/Green The hub is operational, but the agent detected a
hardware error such as an NVRAM failure or internal 2-port 10/100 switch
failure. The LED is yellow for one second and green for one second.
Green The firmware agent has finished booting and is now ready for any
management processing.
2724 Manageable Hub (in a managed stack):
Off The hub is not being managed by the stacks managing hub. This
indicates either a Host/Target switch misconfiguration or a hardware problem.
The STATUS indicator is always off if the 2724 hub is in an unmanaged stack.
Flashing Green The hub has its MAN/UNM switch set to UNM
(unmanaged). The LED is green for one second and off for one second.
Flashing Yellow/Green The hub is operational, but the agent detected a
hardware error such as an internal 2-port 10/100 switch failure. The LED is
yellow for one second and green for one second.
Green The hub is properly configured and is being managed by the stacks
managing hub.
10 COL (Collision) Flashing Yellow Collisions on the 10 Mb/s segment
OFF No collisions on the segment
100 COL (Collision) Flashing Yellow Collisions on the 100 Mb/s segment
OFF No collisions on the segment
continued

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Overview
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LED Status and Description
10/100 SW (Switch) Flashing Yellow Internal 10/100 switch problems, such as buffer
overflows, address table full
Green Internal 10/100 switch is enabled
OFF Internal 10/100 switch is disabled; 10 Mb/s segment is isolated
100 BP (Backplane) Green 100 Mb/s connected to a 100 Mb/s backplane
OFF 100 Mb/s isolated from the 100 Mb/s backplane
ALT (Alternating) Green Port LEDs alternate between 10 Mb/s and 100 Mb/s status
OFF Alternating mode off
Mode button Disables the alternating mode and selects 10/100 port LED display
100 MBPS (Management Port) Green Port LEDs show 10 Mb/s status
OFF Port LEDs do not show 10 Mb/s status
10 MBPS (Management Port) Green Port LEDs show 100 Mb/s status
OFF Port LEDs do not show 100 Mb/s status
Smart Uplink Module (SUM-TX)
Activity Flashing Green 100 Mb/s traffic occurring on the module
Green Link active, no traffic on the module
OFF No link
Collision Flashing Yellow Collisions on the module
OFF No collisions
Serial COM Port
The 2824 (managing) hub contains a serial COM port that uses a DB9
connector with a standard AT pinout. This port lets you perform the following
operations:
■XMODEM firmware downloads
■VT100 console interface for basic management and initially setting the
IP address
■SLIP (Serial Line Internet Protocol) transfers, including remote (out-of-
band) management, SNMP, Telnet, and TFTP firmware downloads.

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See Chapter 4 “Configuring the Hub for Management” and Appendix B “Using
the VT100 Interface” for more information about the serial port.
Host/Target DIP Switch
On the back panel of the 2724 hub is a HOST/TARGET DIP switch that
determines whether the hub is a host or target hub in a hub stack. For example,
you can connect up to two 2724 hubs and designate one as the host and the
other hub as a target for an unmanaged stack. Or, if you have a managing hub
(2824) in the stack, you can set up to four 2724 manageable hubs as target hubs
for a managed stack. The 2824 hub does not have a HOST/TARGET DIP
switch.
NOTE: There may be only one host hub in a stack. More than one host hub prevents
the stack from passing Ethernet traffic or management commands between units.
Figure 1- 5. 2724 Hub DIP Switches

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Overview
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Managed/Unmanaged DIP Switch
On the back panel of the 2724 hub is a MAN/UNM DIP switch that sets the
hub’s initial 100 Mb/s port enable/disable and backplane connection status.
When the switch is set to “MAN,” the hub sets the initial 100 Mb/s port
enable/disable and backplane connection status. When the switch is set to
“UNM,” the initial 100 Mb/s port and backplane status is set to the hardware
default (enabled). The 2824 hub does not have a MAN/UNM DIP switch.
NOTE: When a managing hub is present, it can set port statuses regardless of the
switch setting.
Internal 10/100 Switch Disable DIP Switch
The internal 10/100 switch disable DIP switch, located on the back panel of the
2724 hub, lets you disable the internal two-port switch. When you set the switch
to “SW DIS,” the internal switch is disabled, preventing 10 Mb/s packets from
being forwarded to the 100 Mb/s segment and vice-versa. This effectively
isolates the 10 Mb/s segment and disables connectivity to the management
agent. When you set the switch to “SW EN,” the internal switch allows packets
to be forwarded between the 10 Mb/s and 100 Mb/s segments, unless the switch
is disabled by the management agent.
If you set the DIP switch to “SW EN,” you can enable and disable the switch
using the n2feTen100SwEnable MIB variable. However, if you set the DIP
switch to “SW DIS,” the hardware disables the bridge, which the management
agent cannot change.
You can view the status of the internal switch in the Netelligent 2000/FE (Fast
Ethernet) MIB variable n2feTen100SwHardwareDisableSwitchStatus.
10 ONLY - 10/100 Switch
The 10 ONLY - 10/100 switch, located on the front panel of both 2724 and
2824 hubs, lets you set the allowable connection types for Port 1. When you set
the switch to “10 ONLY,” Port 1 allows 10 Mb/s connections only. When you
set the switch to “10/100,” Port 1 allows 10 Mb/s or 100 Mb/s connections.