Black Box LH8112A User manual

MDI-II 10/100 Managed Hub MDI-II
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Installation & User Guide
10/100 MANAGED HUB
JUNE 1999
LH8112A
LH8124A
LH8112A-S
LH8124A-S
Order toll-free in the U.S. 24 hours, 7A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
CUSTOMER
SUPPORT
INFORMATION

© 1999 Black Box Corporation All rights reserved. Printed in USA.
Black Box and the Black Box logo are registered trademarks of Black Box Corporation.
All other trademarks appearing in this manual are the property of their owners.
This publication is protected by the copyright laws of the United States and other countries, with
all rights reserved. No part of this publication may be reproduced, stored in a retrieval system,
translated, transcribed, or transmitted, in any form, or by any means manual, electric, electronic,
electromagnetic, mechanical, chemical, optical or otherwise, without prior explicit written
permission of Black Box Corporation.
The information contained in this document is assumed to be correct and current. The
manufacturer is not responsible for errors or omissions and reserves the right to change
specifications at any time without notice.

Table of Contents
10/100 Managed Hub
Installation & User Guide
Introduction ...............................................................................................7
Unpacking the 10/100 Managed Hub.........................................7
Overview ....................................................................................7
Key Features............................................................................... 9
Front Panel Overview...............................................................12
Clients................................................................................... 12
LED Indication ...............................................................13
Master Units .........................................................................15
Rear Panel Overview................................................................ 16
Installation ...............................................................................................17
Choosing a Location.................................................................17
Stacking ...................................................................................17
Rack Mounting .........................................................................17
Using Cascade Cables .............................................................. 17
Constructing a Management Stack........................................... 18
Position Within the Stack .....................................................18
Master Hub Role .................................................................. 18
Client Hub Role.................................................................... 19
Hub ID..................................................................................19
Segmenting Hubs ................................................................. 19
Connecting Devices.............................................................. 19
Cables ...................................................................................19
Workstations ......................................................................... 20
Connecting to Ethernet Hubs or Devices ................................. 20
Connecting to Fast Ethernet Switching Hubs and Devices ......21
Connecting to Other Dual Speed Hubs ....................................21
1

4 10/100 Managed Hub
Using Expansion Modules ......................................................................23
Expansion Module Overview...................................................23
Internal Bridge Function ...................................................... 23
External Bridge Function .....................................................23
Backpressure (flow control) .................................................24
Installing a Bridge Module................................................... 24
TX Module LED Indicators .................................................26
FX Module LED Indicators.................................................. 27
Module LH8100C-2TX............................................................28
Module LH8100C-3TX............................................................30
Module LH8100C-2FX ............................................................32
Module LH8100C-3FX ............................................................34
Managing Through the Mini Console....................................................37
Mini Console Overview ........................................................... 37
Features ...................................................................................37
VFD Display ............................................................................38
Observing Basic Port Information............................................38
Port Indicator Definition .......................................................... 39
Console Keys............................................................................ 39
Menu Tree ................................................................................40
Observing Network Traffic ..................................................42
Selecting a Group .................................................................43
Monitoring Port Statistics..................................................... 44
Selecting a Port to Monitor ............................................. 45
Monitoring Port Detail Information ................................ 47
Monitoring All Ports Status .............................................47
Monitoring Individual Port Status...................................49
Configuring Ports .................................................................50
Configuring All Ports ...................................................... 50
Configuring a Single Port................................................ 51
Unit Configuration ............................................................... 52
Configuring the Unit ....................................................... 53
2
3

5
4
Locking the Mini Console...............................................53
Unlocking the Mini Console ........................................... 54
Network Configuration ........................................................ 55
IPAddress Configuration ................................................ 55
Subnet Mask ....................................................................57
Default Gateway..............................................................57
Out-of-Band Configuration ............................................. 57
Securing the Hub ......................................................................57
Setting the Password .......................................................57
Cancelling the Password ................................................58
In case You Forget the Password....................................58
Restarting the Hub....................................................................59
Restoring the System Default Setup.........................................59
System Information Menu........................................................60
Master Hub Configuration & Console Management ............................61
Connecting the Console Interface ............................................61
Menu Convention .....................................................................62
Using the Console Program......................................................64
Logging In ............................................................................ 64
Main Menu ...........................................................................65
Monitoring System Information...........................................66
Setting Up for Management ..................................................... 68
Network Configuration ........................................................ 69
Local Console/Remote Telnet-Ethernet ............................... 69
Local Console/Remote Telnet-SLIP.....................................70
Serial Port Configuration .....................................................72
SNMP Community Setup .....................................................74
Trap Receiver Setup .............................................................76
Web-Based Management Configuration ..............................78
Trap Filter .............................................................................80
Controlling Devices..................................................................81
Repeater Group Control/Status ............................................ 82
Repeater Port Control/Status ................................................ 85

6 10/100 Managed Hub
2/3 Port Bridge Module Control/Status................................ 87
Redundant Link Control.......................................................90
Security Intrusion .................................................................94
Monitoring the Network...........................................................96
Repeater Statistics Information ............................................97
Repeater Group Statistics Information ................................. 99
Repeater Port Statistics Information ..................................101
Address Tracking Information............................................ 105
Address Search Information ............................................... 107
Broadcast Storm Protection................................................ 109
Broadcast Storm Detected .................................................. 111
User Authentication................................................................ 112
System Utility......................................................................... 114
System Download .............................................................. 115
System Restart .................................................................... 116
Factory Reset ...................................................................... 118
Login Timeout Interval....................................................... 119
Configuration Upload Setting ............................................ 120
Configuration Upload Request/Status ................................ 121
SNMP Management ............................................................... 122
Technical Information...........................................................................123
Product Specifications............................................................123
Agency Compliance ............................................................... 126
RFI Statements ....................................................................... 126
Appendix ................................................................................................129
Mini Console Menu Tree........................................................ 129
Troubleshooting the Network.................................................130
5

Introduction 7
Introduction
Unpacking the 10/100 Managed Hub
Check that the following components have been included:
• 10/100 Managed Hub
• Rack Mount Bracket and Hardware
• Rubber Feet
• Cascade Cable
• Power Cord
• Installation & User Guide (this manual)
Your order has been provided with the safetest possible packaging. Inspect
it carefully. If you discover any shipping damage, notify the carrier and
follow their instructions for damage and claims. Be sure to save the
original shipping carton if return or storage of the unit is necessary.
Overview of the 10/100 Managed Hub
The 10/100 Managed Hubs are auto sensing, dual speed, manageable and
stackable hubs. The 10/100 Managed Hub series consists of masters and
managed clients with 12 or 24 ports. The features and functions of the 10/
100 Managed Hub series makes it a powerful, cost-effective solution for
large campus networks and rapid growth companies.
All models in the 10/100 Managed Hub series accept slide-in expansion
modules, adding more power and versatility, such as: bridging 10Mbps and
100Mbps segments and extending distances up to 2 kilometers.
10/100 Managed Hub LH8112A/LH8112A-S
The twelve port models are the LH8112A(master) and the LH8112A-S
(client).
The LH8112A master model shown below includes a Network
Management Unit (NMU), Mini Console, 12 dual-speed auto sensing
ports, 2 MDI-II ports and a switch module expansion slot.
MDI-II 10/100 Managed Hub MDI-II
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10/100 Managed Hub (LH8112A) 12-port Master

8 10/100 Managed Hub
The LH8112A-S managed client model shown below, includes an LED
panel, 12 dual-speed auto sensing ports, 2 MDI-II ports, and a switch
module expansion slot. The LH8112A-S can be fully managed by any
master model.
10/100 Managed Hub (LH8112A-S) 12-port Client
10/100 Managed Hub LH8124A/LH8124A-S
The twenty-four port models are LH8124A (master) and LH8124A-S
(client).
The LH8124A master model shown below includes a Network
Management Unit (NMU), Mini Console, 24 dual-speed auto sensing
ports, 2 MDI-II ports and a switch module expansion slot.
10/100 Managed Hub (LH8124A) 24-port Master
The LH8124A-S client model shown below includes an LED panel, 24
dual-speed auto sensing ports, 2 MDI-II ports, and a switch module
expansion slot. The LH8124A-S can be fully managed by any master hub
model.
MDI-II MDI-II
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10/100 Managed Hub (LH8124A-S) 24-port Client

Introduction 9
Key Features
The 10/100 Managed Hub series has many advanced features:
10/100Mbps Auto Sensing Ports
All ports in the 10/100 Managed Hub series are dual speed auto sensing,
including the MDI-II ports. Hubs automatically detect the transmission
speed and set the port accordingly.
Stackability
Every model in the 10/100 Managed Hub series is compatible, and can be
configured in the same stack with up to 6 hubs, using cascade cables.
Expansion Slots
Every model in the 10/100 Managed Hub series has one slot for adding
expansion modules, see below. The lower slot accepts switch expansion
modules. See Chapter 2: Using Expansion Modules for more information.
The upper slot is for the Network Management Unit (NMU) only.
Expansion Slot
Manageability
The 10/100 Managed Hubs provide extensive management capabilities
including: Mini Console Management for device level management,
Console Management using a VT-100 terminal emulator, Web-Based
Management using a Web Browser or SNMP network management.
• Mini Console Management
• Local Console/Remote Telnet
• Out-of-Band Management
• Web-Based Management
• SNMP Management
AC LINE
100-240VAC
50-60Hz, 1.5A MAX
Stackable
Up
NMU
Switch/
Transceiver
Down
Expansion Module Slot
Slot for Network Management Unit (NMU) only

10 10/100 Managed Hub
RMON Probe Capability
The Remote Network Monitoring (RMON) probe is an instrument that
exists for the purpose of managing a network. The goals of the RMON
probe are described in the following sections: Offline Operation, Proac-
tive Monitoring, Problem Detection and Reporting, Value Added Data,
and Multiple Managers. The 10/100 Managed Hub supports RMON
group (1) statistics, group (2) History, group (3) Alarm, and group (9)
Event.
•Offline Operation: This allows a probe to be configured to
perform diagnostics and to collect statistics continuously,
even when communications with the management station
may not be possible or efficient.
•Proactive Monitoring: The monitor can notify the manage-
ment station of failure and can store historical statistical
information about the failure. The management station can
play this historical information back in an attempt to
perform further diagnosis into the cause of the problem.
•Problem Detection and Reporting: The monitor can be
configured to recognize conditions, most notably error
conditions, and to continuously check for them. When one
of these conditions occurs, the event may be logged, and
management stations may be notified in a number of ways.
•Value Added Data: By highlighting those hosts on the
network that generate the most traffic or errors, the probe
can give the management station precisely the information
it needs to solve a class of problems.
•Multiple Managers: Remote monitoring can deal with
multiple management stations using its resources
concurrently.

Introduction 11
Redundant Link Capacity
Redundant links can be configured enabling up to 24 pairs in a hub. For
each pair of redundant links one port must be set as the primary and
active, the other as backup and isolated. If the primary port fails, it is
isolated and the backup port is set to primary and active.
Address Tracking Capability
The 10/100 Managed Hub provides MAC Address based tracking
capability for traffic analysis to diagnose network problems such as
Intrusion. This function records the source MAC address of each data
packet received by the port and provides the filter for data analysis. Up to
15 source MAC addresses can be detected on each port.
SourceAddress Search Capability
The 10/100 Managed Hub provides Source Address Search Capability.
This active address tracking capability is used to watch for a given MAC
address and report on which port it was seen. This capability can be used
to collect the necessary information for mapping the topology of a
network. Up to 8 MAC addresses can be searched simultaneously. You
can configure address search parameters including Source MAC address
and Address Search Status with local console management, Web-Based
Management or SNMP management.
Security Intrusion Control Capability
The 10/100 Managed Hub provides MAC Address based Security
Intrusion Control Capability to prevent any unauthorized nodes access to
the network. You can configure the hub to take various actions when a
violation is detected. Actions include: no action, sending a trap message
or partitioning a port.
Broadcast Storm Detection and Protection Capability
The 10/100 Managed Hub provides Broadcast Storm Detection and
Protection Capability by periodically monitoring the broadcast counters of
each port to detect a broadcast storm. Ports detected causing a broadcast
storm are automatically partitioned, a trap is sent to the network manager,
or no action is taken, depending on the configuration.

12 10/100 Managed Hub
Front Panel Overview: Clients
An LED panel, 12 dual-speed, auto sensing ports, switch module installed
LED, and 2 MDI-II shared ports are on the front panel of the unit.
See below.
An LED panel, 24 dual-speed, auto sensing ports, switch module installed
LED, and 2 MDI-II shared ports are on the front panel of the unit.
See below.
The Switch Module Installed LED is on if a switch module is installed in
the hub.
Front Panel LH8112A-S (12 Ports)
Front Panel LH8124A-S (24 Ports)
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MDI-X Ports
MDI-II Ports
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Introduction 13
LED Indication
The hub’s LEDs indicate status information for the device, its ports for
both segments (10Mbps and 100Mbps), and switch status.
LED Indicators 12 Port
Power
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LED Indicators 24 Port
•Power: The Power LED is on when the power cable is
plugged into the hub and a wall socket.
•Link/Rx: The Link/Rx LED is on for each connected port
and blinks for ports receiving transmissions.
•Collision: Collision LEDs indicate collision for either
segment (10Mbps and 100Mbps). If there is collision in a
segment the LED for that segment is on.
•Forward: Packet forwarding is active via the switch module
connecting both 10Mbps and 100Mbps domains. Forward
LED indicates the packet forward status through the switch
modules. Forward for both segments (10Mbps and
100Mbps) is indicated in the table on the next page.

14 10/100 Managed Hub
Forwarding LED* indicator meaning
Forward Status Int Ext Meaning
LED Switch Switch
100M On On Off A 10Mbps transmission
being received by
100Mbps segment
through the internal switch
100M On Off On A 10Mbps transmission
being received by
100Mbps segment through
the external switch
10M On On Off A 100Mbps transmission
being received by 10Mbps
segment through the
internal switch
10M On Off On A 100Mbps transmission
being received by 10Mbps
segment through the
external switch
100M On On On A 10Mbps transmission
being received by 100Mbps
segment through the internal
switch and through the
external distance extender
(Modules LH8100C-3TX
and LH8100C-3FX only)
10M On On On A 100 Mbps transmission
being received by 10Mbps
segment through the internal
switch and through the
external distance extender
(Modules LH8100C-3TX
and LH8100C-3FX only)
*NOTE: Collision LED is amber. All other LEDs are green.

Introduction 15
•Internal Switch (Bridge): The Internal Switch LED is
always on when the internal switch (bridge) function is
active and forwarding the data.
•External Switch (Bridge): The External Switch LED is on
when data is being forwarded from one segment to another
segment through the external switch port.
•Hub ID: Each linked hub is automatically assigned a hub
ID number and this number is indicated in the ID indicator.
Front Panel Overview: Master Units
The front panel for model LH8112A supports the Mini Console, switch
module installed LED, 12-10/100 ports, and 2-MDI-II ports.
The front panel for model LH8124A supports the Mini Console, switch
module installed LED, 24-10/100 ports, and 2-MDI-II ports.
The Switch Module Installed LED is on if a switch module is installed.
MDI-II MDI-II
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Switch Module Installed LED
MDI-X Ports
MDI-II PortsConsole Keys
Mini Console Hub ID
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Front Panel 10/100 Managed Hub LH8112A (12 Port)
Front Panel 10/100 Managed Hub LH8124A (24 Port)

16 10/100 Managed Hub
Mini Console
The Mini Console is a high definition display with console keys that
enables you to easily monitor and configure the system. The Mini
Console provides watch diagnostic functions, including port settings,
status monitoring, traffic utilization, collision, and error rate.
With the Mini Console, you can configure each device in a hub and all of
its ports. For more information see Chapter 3: Managing Through the
Mini Console.
Mini Console
Rear Panel Overview
The rear panel of each hub in the 10/100 Managed Hub series supports
two expansion slots, two cascade ports and an AC power socket.
The cascade ports are used for cascading hubs (stacking hubs); the Up
port of one hub must be connected to the Down port of the other hub.
The AC power socket can be safely plugged into 100~240 VAC outlets.
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WWW
SNMP
O-O-B
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AC LINE
100-240VAC
50-60Hz, 1.5A MAX
Stackable
Up
NMU
Switch/
Transceiver
Down
Expansion Module Slot
NMU Module Slot
Down Link
Up Link AC Power Socket
Rear Panel Layout

Installation 17
Chapter 1
Installation
Choosing a Location
The 10/100 Managed Hub location should be less than 100 meters from
servers, workstations, or switches. The 10/100 Managed Hub can be desk
mounted or rack mounted.
CAUTION: Category 5 UTP/STP cables are environmentally
sensitive. Make sure that the cable route is not too close to
electrical noise sources such as power lines or fluorescent lights.
Stacking
The 10/100 Managed Hubs are stackable in standard 19”racks. Up to six
hubs can be stacked with cascade cables. One master and up to five slaves
can make up a stack. The master can be positioned anywhere in the stack,
so you can add to a stack without re-positioning the hubs.
Rack Mounting
Rack mounting brackets are included to mount hubs in a standard EIA
19-inch racks.
Align the mounting brackets on the sides of the unit with the slit over the
holes. Secure the screws tightly to fix the brackets to the device. Then,
place the device into the 19”rack and affix it properly. Please ensure that
the ventilation holes on the unit are not blocked.
Using Cascade Cables
You can stack the 10/100 Managed Hubs using cascade cables. The
master hub can be placed anywhere in the stack. By cascading the hub
stack, each hub is automatically identified and assigned an ID number
according to its position in the stack.

18 10/100 Managed Hub
Cascading hubs with cascade cables to make a stack is as simple as
connecting the Up port of one hub to the Down port of another hub as
illustrated below.
Cascade Ports
NOTE: To connect the cascade cable, the Up port on one hub connects to
the Down port of another hub.
Constructing a Management Hub Stack
A stack can be constructed with up to six hubs in total. One master hub
and up to five slave hubs can exist in one stack.
Position within the Stack
The master hub can be positioned anywhere in a stack and automatically
assigns the ID of each hub according to its position in the stack.
Master Hub Role
The master is used to manage and configure other hubs in the stack and
supplies the stack with additional ports (12/24) and an additional expan-
sion module slot. The master hub can also be used as a stand-alone
intelligent hub. Managing the hubs can be accomplished with the master
hub’s versatile management capabilities, such as:
•Mini Console Management
Refer to Chapter 3: Managing Through the Mini Console
Stackable
Up
NMU
Switch/
Transceiver
Down
Stackable
Up
NMU
Switch/
Transceiver
Down
Stackable
Up
NMU
Switch/
Transceiver
Down

Installation 19
•Console Management
Refer to Chapter 4: Console Management
•Web-Based Management
Refer to the Network Management Guide
•SNMP Management
Refer to the Network Management Guide
Client Hub Role
Client hubs supply the stack with additional ports (12/24) and an addi-
tional expansion module slot. Client hubs can be positioned above or
below the master hub. The LH8112A-S and LH8124A-S can also act as
stand alone unmanaged hubs.
Hub ID
The master hub and client hubs can be positioned anywhere in the stack
and each hub’s ID is automatically assigned based on its position (in the
stack).
Segmenting Hubs
The 10/100 Managed Hubs can isolate one or both segments (10 Mbps
and 100 Mbps segments) from the other hubs in a stack. When a segment
is isolated it does not repeat to the other segments in the hub or to other
segments in the stack.
Connecting Devices
The dual speed 10/100 Managed Hub can connect to 10Mbps, 100Mbps,
or 10/100Mbps devices due to its auto sensing capability. The 10/100
Managed Hub will auto sense the connected port speed and set its port to
match the speed of the connected port.
Cables
The 10/100 Managed Hub ports accept Cat 3, 4 and 5 cables with RJ-45
connectors for 10Mbps connections and Cat 5 cables with RJ-45 connec-
tors for 100Mbps connections. The maximum length of cables, between
hub and workstations is 100 meters. The maximum length of cables,
between hub and hub is 5 meters for 100Mbps connections and 100

20 10/100 Managed Hub
meters for 10Mbps connections. All ports are hot pluggable. It is recom-
mended you label each cable to identify the device or port at each end.
Connecting Devices
Connecting Workstations
Install either a 10BASE-T or a 100BASE-TX Fast Ethernet Network
Interface Card into each workstation if not already installed. Using a
UTP/STP cable, connect the Ethernet card (in the workstation) to a hub
port.
Connecting Ethernet Hubs or Devices
Connect 10Mbps devices using UTP/STP Cat 3, 4 or 5 cables with RJ-45
connectors, enabling sending/receiving to or from other 10Mbps devices.
By default, each port is set in auto sensing mode. The 10/100 Managed
Hub can detect a 10BASE-T device and transmit/receive information
to/from it.
MDI-II MDI-II
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10/100 Managed Hub
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Shared Ports Shared Ports
Connecting Ethernet Hubs
10Mbps
10/100 Managed Hub