HP 10Base-T Hub-16M Installation And Reference Manual

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Installation and Reference Guide

HP J3188A

HP 10Base-T Hub-16M

HP 10Base-T Hub-16M (J3188A)

Installation and Reference Guide

This document contains information which is protected by copyright. Reproduction, adaptation, or translation without prior permission is prohibited, except as allowed under the copyright laws.

Publication Number

J3188-90001 Edition 1 July 1997

Applicable Product

HP 10Base-T Hub-16M (J3188A)

Trademark Credits

MS-DOS® and Microsoft® are U.S. registered trademarks of Microsoft Corporation. Ethernet is a registered trademark of Xerox Corporation. CiscoView is a trademark of Cisco Systems, Inc.

Disclaimer

The information contained in this document is subject to change without notice.

HEWLETT-PACKARD COMPANY MAKES NO WARRANTY OF ANY KIND WITH REGARD TO TH IS MAT ERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connect ion w ith the fu rn is hing, performance, or use of this material.

Hewlett-Packard assumes no responsibility for the use or reliability of its software on equipment that is not furnished by Hewlett-Packard.

Warranty

See the warranty booklet and the registration form included with the product.

A copy of the specific warranty terms applicable to this product and replacement parts can be obatined from your Cisco Sales and Service Office or authorized dealer.

HP 10Base-T Hub-16M (J3188A)

Back of the Hub

HP 10Base-T Hub-16M (J3188A)

The HP 10Base-T Hub-16M (J3188A) is a multiport repeater with 16 twistedpair ports, and one AUI port. With thi s hub, you can connect computers, printers, and server s togethe r for file sharing. Thi s hub is com pliant with the IEEE 802.3 Type 10Base -T sta ndard and supports both 802.3 and Ethernet networks. The HP Hub-16M follows these two st andards by providing these features:

■ lighting the hub’s port LED when it detects the connected device is

powered on and cable is good.

■ retransmitting data that did not suc cessfully arrive at the destination

device (collision detect ion).

■ temporarily disabling a port if a device connected to the port persistently

causes problems for the ne twork (auto-partioning).

ront of the Hu

System

Hub status LEDs (Fault, Security, Collision, Activity)

RPS Status

Twisted Pair port status LEDs

MDI/MDI-X switch for port 16.

Twisted-pair ports

RPS connector Serial Port Password

AUI Connector for External Transceiver

Reset Button

iii

HP 10Base-T Hub-16M (J3188A)

Features

Network Connections • Sixteen RJ-45 ( twisted-pair ) ports to connect to end nodes or other devices.

• A Media Depend en t Interface (MDI) switch for Port 16 which allows you to connect either an end node (MDI-X position) or to cascade a hub (MDI position) to the port , using a “straight-through” twisted-pair cable in both cases. Ports 1 through 15 always are MDI-X. P ort 16 ha s a fact ory defa ult of MDI- X, but ca n be togg led to an MDI state with the adjacent push-button.

• An AUI port in the fr ont of the hub for several t ypes of extern al transceiv ers, includ ing ThinLAN, twisted-pair, and fiber-optic. The twisted-pair transceiver adds another RJ45 port for a total of 17 twisted-pair por ts on the hub. The fiber- optic transceiver allows you to connect your hub to a fiber - optic backbone.

Easy-to-Use Design • Hub Status LEDs showing power, activity, collisions, RPS status, fault, securit y an d

Standards-Based Compatibility

Other Features • Extended hub manag eme nt capabilities, providing a full set of management

port status prov ide quick, easy-to-read hub status in formation and tro ubleshooting help.

• Metal brackets (included with the hub) that can be easily attached to the hub for mounting the hub in a standard 19-inch telco rack.

• IEEE 802.3 Type 10Base-T standard compatibility to support both 802.3 and Ethernet networks.

• Advanced embedded SNMP agent code enabling the hub to be managed remotely from a network manag ement station that supports Simple Network Management Protocol (SNMP) over IP (using the configured IP address) or Novell NetWare (IPX). The agent code also provides HP EASE (Embedded Advanced Sampling Environment), which samples network data for enhanced diagnostics from a network management station.

commands tha t can be executed from an ASCII cons ole session. Thes e are describe d later in this document in chapter 3, “Managing the Hub.”

• An RS-232 serial port that provi des out-of-band m an agement access including: – An ASCII consol e to configure, monit or, and troubleshoot the hub. – Variable baud rates on the hub’s out-of-band management RS-232 port, and

automatic sensing of the selected baud rate when connecting to a terminal device.

– Full V.22bis modem line control for remote out-of-band management access to the

hub.

– Updatable firmware that enables enhancements to be downloaded either from a

computer attach ed to the out-of-band management port or over the network.

• A Redundant Power Supply (RPS) connector that enables an RPS to be connected to the hub, providing an alternative redundant power source.

• Advanced inte grated design including an Intel i960 RISC processor, 1 megabyte RAM, and 512 kilobyte s of fl ash EEPRO M for conf igur atio n and futur e up gr ade c apab iliti es.

Contents

1 Installing the Hub

Installing and Configuring Your Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1. Verify included parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2. Connect the external transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

3. Verify the hub operates correctly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

4. Mount the hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

5. Connect the hub to your network . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Connecting Devices to the Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Connecting Hubs Together . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Interpreting LED Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Interpreting Hub Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Interpreting Port Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

2 Troubleshooting

Troubleshooting Approaches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Using a Checklist to Diagnose the Hub . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

LED Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Hub Maintenance Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Testing the Hub Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Clearing a Password for the ASCII Console . . . . . . . . . . . . . . . . . . . . . 2-5

Running Connectivity Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Obtaining Firmware Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

3 Managing the Hub

Setting up the ASCII Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Starting the Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Console Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

A Cables and Connectors

Recommended Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Twisted-Pair Cable/Connector Pin-Outs . . . . . . . . . . . . . . . . . . . . . . . A-3

Twisted-Pair Cable for Hub-to-Compu ter Network Connection . . . . A-3

RS-232 Connector and Cable Pin-Outs . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Minimum Cable Pinout for ASCII Console Connection . . . . . . . . . . . A-5

RS-232 Modem Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Twisted-Pair Cable Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

B Specifications

Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Electromagnetic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

C Modem Configuration

D Network Addressing

Communication Between the Hub and Network Management Station

D-1

IPX Addressing for Novell NetWare . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2

IPX Addressing Notes: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2

IP Addresses for IP and Non-IP Networks . . . . . . . . . . . . . . . . . . . . . D-2

Globally Assigned IP Network Addresses . . . . . . . . . . . . . . . . . . . . . . D-2

Device IP Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-3

Using BOOTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4

The BOOTP Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4

BOOTP Table File Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-5

E Backup Links

How Backup Links Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

Additional Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

Examples of Backup Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3

How the Backup Function Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3

Configuring a Backup Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5

Configuration/Installation Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . E-5

Identifying the Backup Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-6

Indications of Backup Link Activation . . . . . . . . . . . . . . . . . . . . . . . . . E-6

Reactivating the Primary Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7

F Security Information

Understanding Network Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

How Intruder Prevention Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2

How Eavesdrop Prevention Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2

Authorized MAC address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2

Setting Inbound Security with Intruder Prevention . . . . . . . . . . . . . F-4

Auto Port Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-5

Send Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-5

Setting Outbound Security with Eavesdrop Prevention . . . . . . . . . . F-6

G Safety and Regula tory Statements

Mounting Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1

Power Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-2

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-3

Informations concernant la sécurité . . . . . . . . . . . . . . . . . . . . . . . . . . . G-4

Hinweise zur Sicherheit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-5

Considerazioni sulla sicurezza . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-6

Consideraciones sobre seguridad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-7

Safety Information (Japanese) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-8

Regulatory Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-9

vii

Installing the Hub

This chapter describes how to install the hub. Topics in this chapter include

■ installing and configuring the hub

■ connecting devices to the hub

■ connecting hubs together

■ interpreting hub LEDs

Installing the Hub

Installing and Configuring Your Hub

To install and configure your hub, you must complete five basic tasks. They are:

Installing the Hub

■ locating and verifying the necessary parts

■ connecting an external transceiver (if necessary)

■ connecting the hub to a power source

■ mounting the hub

■ connecting the hub to your network

1. Verify included parts

Each Hub-16M has the following components shipped with it:

■ HP 10Base-T Hub-16M (J3188A) Installation and Reference Guide—

this manual (J3188-90001)

■ A U.S./Canada/Mexico (8120-1378) power cord.

■ Accessory kit (5064-2 05 3) :

• bumper feet (4)

• hub-to-rack screws 10-32 (4)

• bracket-to-hub screws 10-32 (4)

• nylon fini shing washer (4)

• bracket-to-hub screws (2)

• AUI retainer assembly

1-2

2. Connect the external transceiver

Because of the way the external transceiver protrudes out from hub once it is connected, you may wan t to i ns tal l th e ex te rn al tr ansceiver before insta l li n g the hub. Inspect your installation site and identify whether enough room will be available for the external transceiver to be connected. Then see your external trans ceiver guide for i n stallation instruct ions.

3. Verify the hub operates correctly

Before mounting the hub, connect it to a power source and verify the hub will operate correctly.

Installing and Configuring Your Hu b

Installing the Hub

1. Plug the power cord into the hub’s powe r cord recepta cle and into an AC (alternating current) power source. If you are using an RPS as your primary power source, refer to the Cisco RPS User Guide for specific instructions.

Note If your RPS is the p rimary power source for the hub, disc onnect the AC powe r

cord connected directly to the hub for proper opera tion.

(Optional) Connect Redundant Power Supply connector If not connecting a Redundant Power Supply, connect included power cord here and to an alternating current power source.

cord clip here.

Installing the Hub

Note The hub does not have a power switch; it is powered on when the power cord

is plugged in. HP recommends that you only use one power source at a given time.

1-3

Installing the Hub

Installing and Configuring Your Hub

2. Check the LEDs on the hub’s front panel. When the hub is powered on, it performs a power-on self te st. See the table below for the L ED pattern that occurs during the self test.

Installing the Hub

On for 20 seconds, then enters normal operating state.

On for five seconds, then enters normal operating state.

On for 20 seconds, then enters normal operating state.

LED Pattern

Port LEDs, Fault, Security, AUI

Activity, Collision, RPS

System Stays ON.

ON for approxim ately 20 seconds, then enters normal oper ating state.

ON for approximately five seconds, then enters normal operating state.

Note that once you have connected cables to the hub, a Port LED stays on if link beat has been detected at the port. A Port LED turns off if link beat is not detected. The AUI port stays on if it is enabled.

When the self test com pletes s uccessful ly, th e LEDs go into their normal operational states. If a hub hardware fault exists, the hub will not complete self test. This will be indic ated by an abnormal LED pattern.

1-4

If the self test time elapses and the Fault LED continues to stay on instead of turning off, the h ub may have an error condi ti on . If re pe ati n g th e sel f test does not correct the problem and the Fault LED still stays continuously on, contact your reseller for replacement information. After the hub has passed its self test, you are ready to mount the hub.

4. Mount the hub

Installing and Configuring Your Hu b

Installing the Hub

The HP Hub-16M can be mounted in two ways:

1. in a rack or cabine t

2. on a table

The hardware for mounting the hub is included in the accessory kit (5064-2053) packed with the hub. Before mounting the hub, unplug it.

See Appendix G, “Safety and Regulatory Standards,” for general mounting precautions.

Rack or Cabinet Mounting

Warning The rack or cabinet should be adequately secured to prevent it from

becoming unstable and/or falling over. Please see Appendix G, “Safety and Regulatory Standards,” for precautions and warnings associated with rack mounting.

1. Using a Phillips T-1 0 screwdriver, attach the mounting brackets to the hub with #10-32 x 7/16" silver scre ws (included in th e accessory kit).

2. Position the hub in the rack or cabinet and slide it up or down unt il the rack holes line up with the bracket holes.

3. Then attach the hub to the rack with the #10-32 x 5/8" black screws and black nylon washers included in th e accessory kit with a Phillips crosshead screwdriver. (Some cabinets require number 12-24 screws instead. Make sure you have screws that fit your cabinet or rack before mounting the hub.)

Installing the Hub

1-5

Installing the Hub

Installing and Configuring Your Hub

Installing the Hub

1-6

Table Mounting

To place the hub on a table or other horizontal surface, no special tools are necessary. Apply the fo ur feet included in the accessory kit onto the bottom of the hub. Be certain to pick a sturdy table in an uncluttered area. You may

want to secure the hub’s cabl es to t he leg of the ta ble to prev ent p eople from tripping over them.

Installing and Configuring Your Hu b

5. Connect the hub to your network

Installing the Hub

Reconnect the hub to either an AC power source or the RPS, depending on which source you are using . With the hub mounted, you are now ready to connect the hub to your network. Typical hub connections are:

■ hub-to-device connections. Connecting to network devices such as

computers, and printers.

■ hub-to-hub connections. Connecting to another HP 10Base-T hub, or

other Ethernet hub.

■ hub-to-network backbones. Connecting to a network backbone.

This section describes the different ways you can connect your hub to your network.

Installing the Hub

1-7

Installing the Hub

Installing and Configuring Your Hub

Connecting Devices to the Hub

To connect a device to the hub, push the RJ-45 plug into the RJ-45 jack until the tab on the plug clicks into place.

Installing the Hub

RJ-45

Connector unshielded twisted-pair cable Category 3, 4, or 5 Cat 3, 4 maximum distance: 100 meters

Connecting Hubs Together

Twisted-Pair Cascade Connections

To expand your network, the hub can be connected to other hubs with straight-through cable by using the Media Dependent Interface (MDI) switch.

MDI/MDI-X switch

The MDI/MDI-X switch controls h ow the si gnals are s ent through the twiste dpair cable connected to Port 16. The hub is shipped with the switch in the MDIX position. The switch has two positio ns:

■ In the MDI posit ion, use Port 16 to connect your hub to another hub. In

this position, the hub reverses the Tx and Rx port pairs for you. This allows

you to use “strai ght-through” ca ble rather than “cross-over” cable t o connect two hubs together. The cable can be up to 100 meters in length.

■ In the MDI-X position, use Port 16 to connect your hub to a PC or similar

device using “straight-through” cable.

1-8

Installing and Configuring Your Hu b

Installing the Hub

In the following illustration, the first hub is connected to two end nodes and to a second hub. Note the second hub shows Port 16 connecting to a PC, using a straight through cable with the port in the MDI-X position.

StraightThrough Cable from Hub to PCs

Hub attached to Port 16: switch in MDI position and straight-through cable is used.

Up to 100 meters

Installing the Hub

PC attached to Port 16: switch in MDI-X position and straightthrough cable is used.

ThinLAN Connections

With an HP ThinLAN External Transceiver for 10Base2 netw orks, you can connect your hub or a stack of hubs to a thin LAN network. The following illustration shows a hub with an HP ThinLAN E xternal Transceiver.

1-9

Installing the Hub

Installing and Configuring Your Hub

Installing the Hub

You can connect u p to 30 hubs t ogether on a c ommon ThinLA N segment. The ThinLAN segment can include a com puter attach ed to a hub at one end of the segment that can communicate with a computer attached to another hub at the other end of the segment. By using the BNC port on the module, the maximum repeater hop-count increment through the entire segment is only two. The following illustration shows you how to connect three hubs together from one ThinLAN port to another.

50-ohm terminator

ThinLAN coax connecting the hubs together

50-ohm terminator

Hub-16M

Hub-16U

HP AdvanceStack 10Base-T Hub-24

Note Each ThinLAN cab le se gment m ust b e ter minat ed u sing a 50- oh m termin at or

at each end. In the illustration above, a 50-ohm terminator is placed at each end of the cable segment.

1-10

Interpreting LED Status

Connecting the Hub-16M to a Fiber-Optic Backbone

Installing the Hub

With an HP Fiber-Optic external transceiver for 10Base-F L networks, you can connect your hub to a fiber-optic backbone. The following illustration shows a hub with an HP Fiber -Opti c ex ter n al tr an sce iv er co n ne cte d to a f i be r- o pt ic backbone:

Fiber-optic cable to a fiber-optic backbone

HP J2606A Fiber-Optic

For more information about cabling configuration, see the documentation accompanying the opt ional transceiver modules.

Interpreting LED Status

Installing the Hub

Two types of LEDs exist on the hub. They are:

■ Hub Status LEDs. These LEDs reflect certain conditions that exist on the

hub at large and are not explicitly referring to a give n port.

■ Port Status LEDs. These LEDs reflect basic conditi ons (for example, Link

Beat being enabled) that exist on a specific port.

Status information for both are described in the following tables.

1-11

Installing the Hub

Interpreting LED Status

Interpreting Hub Status LEDs

The hub status LEDs indicate whether the hub is functioning properly. For further details on error conditions indicated by the Status LEDs, see chapter

2, “Troubleshooting”.

LED State Meaning of LED

Installing the Hub

SYSTEM

(Power) (green)

ACT

(Activity) (green)

FLT

(Fault) (Orange)

SEC

(Security) (Orange)

RPS

(RPS) (green)

COL

(Collision) (orange)

On The hub is receiving power. Off The hub is not receiving power.

Flickering ON while a pack et is being transm itted. Normall y, the LED appear s

to flicker. In heavy traffic, it may app e ar on all the time.

On Off Flash

On Off

Flickering This LED is on while a collision is detected. If it appears on

An error has been detected on the hub. No error has been detected on the hub. Flashes simultaneously with port LEDs, indicating the port is

partitioned. A security violation has occurred.

Hub security has no t be en violated. Flashes simultaneously with port LEDs, indicating the port had a

security violation. The RPS is providing power.

The RPS is not providing power.

continuously (with no flicker), it is a possible indicator of a network fault or an imp roperly termin ated cable.

1-12

Interpreting Port Status LEDs

Installing the Hub

Interpreting LED Status

The following table provides LED port information.

LED State Meaning of LED

Twisted-pair Port (green)

AUI Port (green)

* The slow flash is approximately once every 1.5 seconds.

On Link beat is detected from the attached node. Off The port is not receiving the link beat signal from the attached

Slow Flash*

On The AUI port is enabled. Off The AUI port is di sa b led . Slow

Flash

node. The port has been auto-partition ed. This port has been auto-

partitioned (disabled) due to excessive collisions. This port will reenable when the connected device no longer causes collisions.

The port has been auto-partition ed.

Installing the Hub

1-13

Troubleshooting

This chapter describes ways to troubleshoot the hub. Topics covered are:

■ troubleshooting approaches

■ using a checklist to diagnose the hub

■ interpreting the LED pattern during self test

■ hub maintenance tasks

Troubleshooting Approaches

There are three primary ways to diagnose hub problems:

■ By checking the LEDs on the front of the hub as described in the section,

“Using a Checklist to Diagnose the Hub” later in this chapter.

■ By using the ASCII console’s diagnostic functions as described in chapter

3, “Managing the Hub.”

■ By using the CiscoView network management application as described in

the CiscoView online help.

Troubleshooting Using a Checklist to Diagnose the Hub

Using a Checklist to Diagnose the Hub

Use the following table to diagnose t he problem with your HP Hub-16M.

Problem Solution

How do I reset the hub? Remove the plug on th e power cord from the

None of the LEDs are on. Verif y that the power cord is plugged into an

Troubleshooting

I lost the password. Press the password reset button for 10 seconds.

IP configuration errors have been reported.

I want to see if each cable is connected correctly.

A user can’t send data to another user. Use the Connectivity tests in the ASCII console

power source and reconnect it.

active power source and to the hub. Make sure these connecti on s ar e sn ug . Tr y p owe r cy cl ing the hub by unplugging and plugging the hu b back in.

If the Power LED is still not on, verify the AC source works by plug ging another device int o the outlet. Or try plugging the hub into a different outlet or try a different power cord.

If this condition persists, call your HP-authorized LAN dealer or HP representative for assistance.

See page 2-4 for more details.

Use the ASCII console’s IP Conf iguration function as described in the ch apter 3, “Managing the Hub.”

Run TEstlink. See the command description in chapter 3, “Managing the Hub.”

or in CiscoView to test the cabling. The tests are described in this chapter.

2-2

The Fault LED is on . Remove the plug on the power cord from the

The Security LED is flashing. How do I get it to stop?

power source and rec onnect it. If problem persists, the device has an internal failure. Contact your HP aut ho r iz e d dealer or reselle r .

Use the ASCII console or C iscoView to view t he intruder log an d clear the security violations.

Most problems with the hub can be diagnosed using t he LEDs on its front panel. The following section describes the normal LED pattern during selftest, and LED patterns that indicate error conditions on the hub.

Troubleshooting

LED Operation

The tables on the following pages list the hub’s LEDs, their possible states, and diagnostic tips to resolve any error conditions.

LED patterns indicating problems Diagnostic Tips

Power Coll Por t L ED Sec Fault RPS

OFF** ***Verify that the power cord is plugged

into an active power source and to the hub. Make sure these connections are snug. Try power cycling the hub by unplugging and plugging the hub back in.

If the Power LED is sti ll not on, verify the AC source works by plugg ing another device into the outlet. Or try plugging the hub into a different outlet or try a different power co rd.

If this condition persists, call your HP-authorized LA N dealer or HP representative for assistance.

ON*OFF***Check cabl ing on the in dica ted po rt a ll

the way out to the device attached to that port. Faulty wiring or a bad connection could exist somewhere in that connecti on.

The end node or hub attached to the port is off.

The port may be disabled. Use the ASCII console or management application to enable the port.

Troubleshooting

If Port 16, check the position of the MDI/MDI-X switch. See the figure in chapter 1 that details the MDI/MDI-X switch.

ON ON * * * * Very frequent collis ions a re occu rring,

which could in dicate a network fa ult or improperly ter m inated cable.

*This LED is not important for the diagnosis.

2-3

Troubleshooting LED Operation

LED patterns indicating problems Diagnostic Tips

Power Coll Por t L ED Sec Fault RPS

ON * Fast

Flash

ON * Slow

Flash

ON * * Fast

ON * * * ON * The hub has failed its self-test. Power-

Troubleshooting

ON** **OFFThe internal power supply is operating

ON** **ONThe internal po wer supply has failed or

Fast

**A security violation has occurred on

Flash

*Slow

Flash

**Network management security

Flash

the port that is flashing. See SEcure command for definition and details in Chapter 3.

* The port has been aut o- partitioned

because of an excessive collision condition. Ch eck cable connections and status of attached network devices for causes of the excess collisions. The hub will automatically recover after certain IEEE 802.3 criteria are successfully met.

violation occurred. See SEcure command for details.

cycle the hub. If this condition persists, call your HP-authorized LAN deal er o r HP representative for assistance.

properly and the RPS is not being used.

has been unplugged and the RPS has been activated as the current operating po w er supply.

2-4

*This LED is not important for the diagnosis.

Troubleshooting

Hub Maintenance Tasks

There are several hub maintenance tasks you can perform. They include:

■ testing the hub only

■ clearing a password from the ASCII console

■ running connec tivity tests

Each of these tasks is described in the following sections.

Testing the Hub Only

If you believe that th e hub is not operat ing co rrectly, remove and re insert the power cord for that hub. Th is procedure will cause the hub to complete its power-on self-test. If any erro r conditions exist in the hub, the LEDs should display the condition.

Clearing a Password for the ASCII Console

You can use the Password Reset button to clear a forgotten console password that was previously configured on the hub. The password is configured from the ASCII console.

Password Reset

To clear the password, follow these steps:

1. Verify the hub has powered-up, passed power-on test, and that the System LED is lit.

Troubleshooting

2. Press the Password Reset button on the bac k of the hub for 10 seconds.

2-5

Troubleshooting Hub Maintenance Tasks

Running Connectivity Tests

Both the hub and cabling can be tested by running an end-to-end communications test -- a test that sends known data from one network device to another through the hub -- such that you can verify that the data was correctly transmitted between the devices.

PC sending test packets.

PC responding to the test packets.

Troubleshooting

2-6

See your LAN adapter’ s manual for information on running an end-to-end communication test.

Obtaining Firmware Enhancements

In the future, Hewlett-Packard may provide improv ements to this product through fi rmware up grades. T he upg rade code can be downloade d from a P C attached to the hub’s RS-232 port or over the network. The update procedures are described in documents that come with the firmware enhancements.

You can determine the current firmware version on the hub from the ASCII console. Look for the SNMP Agent EEPROM version number to determine the revision. When you access the console, the version number appears.

Managing the Hub

This chapter desc ribes the fe atures avai lable fr om an ASC II console . Topics include:

■ setting up the ASCII Console

■ console command re fe rence

The HP Hub-16M has SNMP that allows you to manage the hub using one of the following utilities:

■ an ASCII console

■ CiscoWorks

■ any SNMP-compliant net work management product except HP

AdvanceStack Assistant.

Setting up the ASCII Console

You can begin a console session in the hub in the following ways:

■ directly, using a serial cable and a terminal (or a PC using a terminal

emulator)

■ remotely, using Telnet

■ remotely, using a modem and a terminal

The HP Hub-16M supports a single console session only. If a console session is already running, a second console session can override the current console session.

Managing the Hub

Setting up the ASCII Console

Directly, Using A Serial Cable and a Terminal

To directly connect a terminal to a hub, follow these steps:

1. Connect an ASCII terminal, or a PC emulating an ASCII terminal, to the

RS-232 port using an RS-232-C “null modem” cable. (For pin-outs and recommended cable s see Appendix A, “Cables and Connectors”.)

2. Switch on the terminal’s power (or switch on the PC’s power and start the terminal emulation program). Configure the terminal for 8 bits per character, 1 stop bit, no parity, Xon/Xoff handshaking, and a baud rate of 38400, 19200, 9600, 4800, 2400, or 1200.

3. Press [Enter] several times for the => or Password prompt. The baud rate for communication between the hub and the terminal is set automatica lly when you press [Enter].

Remotely, Using Telnet

The HP Hub-16M supports a Telnet console session. Your Telnet syntax depends on your TCP/IP software or your terminal server. By default, Telnet is enabled. You can disable Telnet by using the IPconfig c onsole command described on page 3-7.

To establish a Telnet session, follow these steps:

1. Verify that the hub has been configured with an IP address, and that it is accessible via IP from your PC or workstation.

2. Enter the command telnet followed by the IP address or system name of the hub, for example:

telnet 192.1.1.10

Managing the Hub

To end the Telnet session, type DI (the DIsconnect command) to t erminate the console session. Or use your Telnet application’s command to close or quit the Telnet session.

telnet your_hub

(Your Telnet syntax depends on your TCP/IP software or your terminal server. You can use a system name if you have name resolution such as DNS.)

3-2

Setting up the ASCII Console

Managing the Hub

Remotely, Using a Modem and a Terminal

1. Use a full-duplex, asynchronous (character-mode) modem only.

2. Connect the modem to the hub’s RS-232 port using an RS-232-C modem

cable. (For pin-outs and recommended cables see Appendix A, “Cables and Connectors”.)

3. Configure the modem a s desc ribed in the Appendix C, “Modem Configuration.”

4. At the remote site, connect the terminal (or PC emulating a terminal) to the remote mode m. Ma ke su re the ter minal a nd mod ems are f unct ion in g properly, then establish the link between the terminal’s modem and the hub’s modem according to the modem instructions.

5. Press [Enter] several times for the => or Password prompt. The baud rate for communication between the hub and the modem is set automatically when you press [Enter].

Starting the Console

The console session starts with a display similar to the following (the actual version numbers may be different):

HP J3188A Hub-16M ROM A.01.00 EEPROM A.01.00 HW A.01.00

Use console commands for hub configur ation.

Enter password:

If a password has not been assigned with the PAssword command, then you are not prompted for your password here.

If a console session is currently active, then you are prompted to break the current active console session .

A console session is currently active.

Do you want to break in? (Y/[N]) Y

Connecting…

Enter a console command, or HE or? for help. =>

Managing the Hub

3-3

Managing the Hub

Console Command Reference

Enter at least the firs t two l ett er s of a co mm and to e xe cute i t, such as HE for the Help command. The Help command displays a screen like the following, listing all commands.

Syntax Conventions on Help Screen:

<> – Indicates a required parameter. [ ] – Indicates an option al parameter.

Managing the Hub

| – Used as a separator between acceptable variable values. For example, SE <port|SHow|CLear> indicates that either a port ID, or the characters SH

or CL, must be entered after the SE command.

The commands are described in the rest of the chapter.

HElp [cmd] or? [cmd]

To see the help screen shown abo ve or, if you include a specific command, the syntax and description of that specific console command. For the [cmd] parameter, use the first tw o letters of th e command

you wish to see. Example:

3-4

HE ST (This displays help for the Status c ommand.)

BAckup

Console Command Reference

Managing the Hub

To configure one of the hub’s ports for dedicated use in a backup (redundant) link to another hub.

An HP Hub-16M allows you to use any two of its network ports for a redundant link to another hub in your network. The backup link normally carries no traffic, but it is automatically activated if the primary link fails. Note that any

of the ports can be the backup port to any other port.

When you enter the Backup command, you are prompte d for these values:

Default Description

Backup Port Disabled The port used for the backup link. Enter the port ID.

Primary Port None The port used for the primary lin k . Enter the port ID. Remote MAC

address Seconds Between

Test Packets Consecutive

Failures

000000-000000 The 12-digit hexadecimal MAC address of the hub at

1 second How often you want the hub to send an IEEE 802.2

2 failures The number of consecutive Test packet response

Or, enter DI (for disable) if you wish to remove an existing bac kup link configuration.

the remote end of the critical link.

Test packet to the remote hub over the primary lin k.

failures that will trigger activation of the backup link. For example, enter 5 t o activate the backup lin k on the fifth failure.

The hub monitors the prim ary link by sending IEEE 802.2 Test pack ets at the

specified frequency to the specif ied remote h ub. If “n” consecutiv e Respons e packets are no t returned from th e remote hub, the p r imary port is disabled and the backup port is ena bled.

When the primary link is repaired, you must re-enable the primary port by using the Port command. It is not automatically re-enabled. When the primary port is re-enabled, the backup port is disabled automatically and returned to backup mode. See the appendix on Backup Links. This appendix also covers more information on ba ckup links, including requirements, limitations, and sample topologies.

Managing the Hub

3-5

Managing the Hub

Console Command Reference

CDpstatus

COunters

To enable or disable the Cisco Discovery Protocol (CDP). The command takes either an ON or an OFF argument. Th e initial setting is ON. O N enables the protocol. OFF disables it. If no option is chosen, the current status is shown.

To display network activity counters for each network port, the hub’s SNMP agent, and the global count for all ports.

The port counters are from the IEEE 802.3 Repeater Management Specification. They are described below:

Counter Na me Definition Valid Range

Good Packets Number of error-free packets received. Less than 4000

packets per second.*

Collisions Number of times the p or t was involved

in a collision. A single collision will be counted by all ports involved, so the total collision counters may be less than the sum of the port counts.

Late Collisions Number of collisions which went

undetected by the sending end node.

Less than 2 times the number of goo d packets.

Less than.1% of good packets.

Managing the Hub

CRC/Alignment Errors

Giant Packets Number of packets larger than 1518

Broadcast Packets Number of packets addressed to

*The port counters in the ASCII console show totals, not number of packets per second. For the Good Packets and Broadcast packets, display counters twice over a period of one section to see if the value falls in the valid range.

Number of packets transmitted incorrectly and number of incorrectly aligned packets.

bytes.

everyone in the network. These packets consume CPU resources from each node on the networ k.

Less than.1% of good packets.

Less than 200 packets per second.*

Corrective Action if over Valid Range

Decrease the traffic level by using a switch to segment the network.

Decrease the traffic level by using a switch to segment the network

Replace bad cabl es and/or transceivers if problems persist. Rarely, you may have a defective LAN adapter.

Too many repeaters between end nodes, or cables which are too long, or bad cable.

This counter indicates faulty cabling.

Update the LAN ada pter dri vers on all nodes connected to the port.

Decrease the number of nodes in an IP subnet or IPX network by using more routers. Consult Novell Netware documentation on how to reduce broadcasts in an IPX network.

3-6

DIsconnect

IPconfig

Console Command Reference

Managing the Hub

To terminate the console session and reset the console port baud rate to be automatic ally sensed. The command also disconnects the phone link

if you accessed the console using modems.

To set IP (Internet Protocol) configuration parameters on the hub. By default, the hub is configured to use BOOTP (Internet Boot Protocol) t o automatically retrieve the IP parameters from a BOOTP server, and to enable

Telnet access to the hub’s console interface. Use this command if you want to manually configure the IP address or disable Telnet.

The IP configuration must be carefully controlled. If each device’s IP address is not unique on the network, severe network performance problems will occur. A network administrator should maintain responsibility for the IP

settings. See Appendix D, “Netwo rk Addressing,” for information on setting the IP configuration.

Note At the end of the process of changing the IP config uration, the hub will be

reset. This terminates the console session (and disconnects the phone line if using a modem) and resets the con s ole port baud rate to be automatically sensed. To restart a console session, when the reset process completes, press [Enter] several times for the prompt.

When to Use IPconfig

If any of the following is true, the hub’s IP parameters must be configured, either on a BOOTP server or on the hub through the console interface:

■ The hub will be managed remotely with a network management product,

such as CiscoWorks over an IP network (a network that uses IP communications, for example TCP/IP).

■ The network cable segme nts atta ched to the hub will be test ed usin g the

IP “Ping” test.

■ Telnet access to the hub is desired.

Managing the Hub

3-7

Managing the Hub

Console Command Reference

Configuring for Network Management

If the hub is to be managed from a network management station, it must use the same networking protocol as the network management station. You have these choices:

■ Novell NetWare IPX

■ IP

Using Novell NetWare IPX

The HP Hub-16M is designed to automatically use Novell NetWare’s IPX protocol. If you are using the hub on a Novell NetWare network, no configuration of the hub is required for it to communicate with a network management station that is also using the IPX protocol.

The hub determines its IPX addr ess automatical ly from inform ation received from a router or file server that is running IPX on the network, and from its own MAC address, physical address, or Ethernet address). See your Novell documentation for more information on IPX communications and addressing.

Using IP

You can use IP by using one of the following methods:

■ using BOOTP by adding an entry for the hub in the BOOTP table on your

BOOTP server, and enabling BOOTP thr ough the hub’s con sole interfac e (this is the default setting)

■ using the console interface to configure the IP parameters

BOOTP is covered in Appendix D, “Network Addressing.”

Managing the Hub

To use the console interf ace to configure th e IP pa rameter s, ente r IP and th e following text appears:

=>IP Active IP parameters: BOOTP protocol enabled: YES Telnet access enabled: YES IP address: 0. 0.0.0 Subnet mask: 0.0.0.0 Default router: 0.0.0.0 Time to live: 64 Change IP configuration? (Y/[N]):

The following table explains the IP parameters.

3-8

Console Command Reference

Parameter Default Value Definition

BOOTP protocol enabled

Telnet access enabled

IP address 0.0. 0 .0 The IP address of the hub (written in the format X.X .X.X).

Subnet mask Must be supplied and

Default router 0.0.0.0 The IP address of the nearest IP router in your network. If no IP routers

Time to live 64 The number of IP routers a packet is allowed to cross before the packet

YES Keep or set this value to YES if you are using a BOOTP server to provide

YES Determine whether users are allowed to use Telnet to access the hub’s

depends on the class of IP address that has been entered.

the IP configuration to the hub. By default, the hub is configured to automatically seek an IP address from a BOOTP server on the network. This is done when the hub is powered on. If an IP address is not found, the HP Hub-16M will seek an IP address every ten minutes until it finds an IP address. Set this value to NO to disab le this BOOTP process.

If you are not using BOOTP to provide the hub’s IP configuration, you should set this parameter to NO.

console interface.

Each X is a decimal number between 0 and 255 separated by a decimal point. This add ress will be used unles s the BOOTP protocol is enabled. The default value (0.0.0.0) disables IP communications on the hub when BOOTP is also disabled.

The bit mask defining which portion of the IP address is the subnet address, written in the format X.X.X.X. All the device s on your network should use the same subnet mask. See your network administrator for the correct value.

are in your network, enter the device’s own IP address.

is discarded. Increase this value if the hub will be sending IP packets to a destination that is more than 64 routers aw ay. The maximum is 255.

Managing the Hub

MAnagers [SHow]

To configure the list of network man agement stations th at are authorized to access and manage this hub, and to specify which of those stations should receive alarms. Use t he SHow option to display the current

list of authorized management stations without being prompted to edit the list. The list consists of th e IP or IPX addr ess of the ne twork man agement station

and an indication of whether each management station should receive alarms (indications of specific network events that are con figured for the hub from

3-9

Managing the Hub

Console Command Reference

network mana gement— also called SN MP event alarms). The sta rt of the table is shown below. Up to ten network management stations can be entered into the table. Entry 0 (zero) is used for the “all managers allowed” entry.

ID Manager Address (IP or IPX) Receive Alarms?

0 All managers allowed NA 1 2

The hub is initially shipped with all network mana gement st ations a llowed t o manage the hub, but the “all managers” entry does not identify where alarms are to be sent. Specific addresses must be entered into the table to identify where the alarms should be sent.

Note If you want to restrict wh ich manage ment stat ions are allowed to manage the

hub, delete entry 0. Then add the all owed management stations with the A command.

At the interface prompt, enter MA; the current authorized managers list is displayed and you ar e prompted to add or delete an entry in the list, or to enter E to end your editing.

To add an entry, enter A at the prompt. Enter the IP or IPX address of the network management station, or enter A to allow all managers to manage the hub, then indicate at the next prompt whether this management station should receive alarms generated by the hub. A new entry is added to the list.

Managing the Hub

3-10

Console Command Reference

Managing the Hub

Example: To add the network management station with IP addr ess

190.40.101.10 to the list an d t o send alarms to th at sta tio n, th e pr ocess would

appear as follows:

Add entry (A), Delete entry (D), or End changes (E): A Enter Manager Address, or (A) to allow all managers access: 190.40.101.10 Should this manager receive alarms: (Y/[N]):Y

Add entry (A), Delete entry (D), or End changes (E): E Current authorized manager list:

ID Manager Address (IP or IPX) Receive Alarms?

0 All managers allowed NA 1 190.40.101.10 YES 2

To delete an entry, specify the ID number in the list corresponding to the network management station to be deleted.

Example: To delete th e entry made in th e example above , the steps would b e:

Add entry (A), Delete entry(D), or End changes (E): D Enter ID of entry to delete: 1

MEssageinterval

NEighbor

Add entry (A), Delete entry (D), or End changes (E): E

The table entry with I D 1 would now be a blank line.

To enter a new value that will indicate how much time, in seconds, should lapse between transmissi ons of CDP messa ges. Displays the cu rrent inte rval if no time is specif ied. Accep tabl e val ues ar e dec ima l nu mbers from 5 to 9 00 (seconds). The default value is 60 seconds.

Displays the other devices that are using CDP protocol.

3-11

Managing the Hub

Console Command Reference

PAssword

To set or change the password on the hub. The Password is used to prevent unauthorized access to the hub from network management stations, and through the console interface. The hub is initially shipped without a password. Follow the prompts t o enter a new password or to ch ange the existing password. If you assign a passw ord, it is also used as the SNMP community name.

If you decide to delete the password, enter the Password command, then press [Enter] without entering any characters a t the password prompt.

Press and hold the Password Reset button for approximately 10 seconds to clear a password.

Note After the password has been cleared, access to the hub from the ASCII console

and from SNMP management stations will no longer be password protected. A new password can be assigned from the ASCII console or CiscoWorks.

PIng

To test the path between the hub and another device that responds to IP packets. The hub sends Internet Control Message Protocol (ICMP) Echo

Request (Ping) packets to another node with the specif ied IP address and waits for Echo Response packets in return.

When you run the Ping command, you will be prompted for:

Managing the Hub

■ the IP address of the dest ination device (in the format X. X.X.X)

■ the number of packets to send

■ the timeout value (the number of seconds to wait for a r esponse)

If any errors are re ported during this test, there may be a fa ult in the path used during the test or in the destination device. For more information about testing

network links, see chapter 2, “Troubleshooting”.

3-12

POrt <port> <ON/OFF>

To enable (set to ON) or disable (set to OFF) a hub port. The initial setting for all ports is enabled (ON). You can use the Status command to check the current status of all the ports. The < port> parameter can be:

■ twisted-pair port number

■ XCVR or XC for the AUI port

■ ALL or AL for all ports

Example 1: P0 7 OFF (Disables port 7) Example 2: P0 AL ON (Enables all ports)

REset

To reset the hub and run a hub self-test. This command also resets all the network statistic counters, and the time since the last reset. The current configuration is unchanged. The hub is not accessible from network management software while it is being tested, but it continues to repeat data. If the hub is faulty, at the end of the reset process, the Fault LED will stay on.

Console Command Reference

Managing the Hub

RObustness

This command also terminates t he console session (and disconnects the phone line if you are using a modem to access the console) and resets the console port baud rate to be automatically sensed . To r est art the console session, first re-establish the phone link (if used), then press [Enter] several times for the prompt.

Allows you to invoke options to improve the hub’s ability to tolerate network problems resulting from excessive collisions. The configurable options are:

■ Intelligent Partition Recovery

■ Late Collision Monitoring

By default, the robustness fe atures are off. Th e Intelligent Partition Rec overy option makes it difficult for a pro blem port to automatically re-enable itself to send traffic on the network.

3-13

Managing the Hub

Console Command Reference

The Late Collision Monitoring option monitors ports for excessive late collisions. If monitored ports experience excessive late collisions, these ports are disabled.

See the section on Auto-Partitioning in the chapter that provides the Product Description.

SEcure <port|SHow|CLear>

To control or display the hub’s security configuration, and to clear security violation indicators. The <port> parameter can be:

■ a twisted-pair port number only.

■ XCVR or XC for the AUI port.

■ ALL or AL for all ports

Security Configuration Parameter Definitions

The following security parameters are configurable on each of the hub’s network ports. These parameter s are defined on the next two pages:

■ Address selection method, or authorized MAC address

■ Send alarm when intrude r detected

■ Eavesdrop preven tio n

An additional parameter, “Disable port when intruder detected”, is se t automatically by your selection of the address selection method. See “Auto Port Disable” in Appen dix F, “Security Information,” on this parameter.

Managing the Hub

Address selection method, o r authorized MAC address. This is the method by which the hub automatically learns the address of the device that is authorized to use the por t, or you can enter a specific address. The fol lowing methods are configurable:

■ Learn Continuously—provides minimum port security (default secu-

rity state). The hub le ar ns th e ad dr ess o f the first devi ce at tached to the

port and makes it the authorized MAC address. If a different device is later attached to the port, the new address is learned and becomes the authorized address. Eac h new device a ttached beco mes the autho rized devic e. You can be informed of any such changes by setting the Send Alarm parameter to YES. In that case, when a new address is detected, the

3-14

Console Command Reference

Managing the Hub

Security and port LEDs flash, the intruder’s MAC address is displayed on the console Status command screen, and an alarm is sent to the authorized network management station(s) .

■ Use the First Address Heard—provides medium port security. The

hub learns the addre ss of the first de vice attached to the por t and mak es it the authorized MAC addr ess. If you have any security configure d for the port (Send Alarm and/or Eavesdrop Prevention parameters are set t o YES), when a different device is la ter attached to the port, the new address is registered as an “intruder address”; a security violation has occurred. In that case, the port is automatically disabled, and the Security and affected port L EDs flash. A n ala rm is al so sent to the au thorized networ k management station(s) if the Send Alarm parameter is set to YES.

■ Assign an Address—provides the highest security. You enter the

address of the device that is a uthor ized to be at tac he d to th e p ort. If y ou have any security configured for the port (Send Alarm and/or Eavesdrop Prevention parameters are set to YES), when a different device is later attached to the port, the new address is registered as an “intruder address”; a security violation has occurred. In that case, the port is automatically disabled, and the Security and affected port LEDs flash. An alarm is also sent to the authorized network management station(s) if the Send Alarm parameter is set to YES.

■ Port Security Off—disables port security. This is a convenient way to

remove the port security. It automatically sets the Send Alarm and Eavesdrop Prevention parameters to OFF (and therefore, the Disable Port parameter will also be OFF).

Managing the Hub

Send Alarm when intruder detected. Configures the hub to send an alarm (SNMP tr ap) to a network mana gement station whenever an unauthorized address (an int ruder) is detected on the port. Note that for the

alarm to actually be sent, you must have first used the Managers command to configure one or more network managers to receive alarms. See the

Managers command desc ription earlier in this chapter.

Eavesdrop prevention. Configures the hub to prevent the port from hearing data that is intended for another port. Only the data packets that have a destination address that matches the port’s authorized address are sent to the port. If Eavesdrop Prevention is not enabled on all ports, the hub functions like a repeater and every packet seen by the hub is forwarded to the nonEavesdrop Prevention ports. Se e Appendix F, “Security Information,” for a detailed description of this feature.

3-15

Managing the Hub

Console Command Reference

Configuring Security on a Single Port

To set or change the securit y configuration for a single p ort on the hub (twisted-pair or AUI), enter

current security con fig uration is displayed, followed by a prompt to change the configuration or n ot.

If you choose to change the configuration, you are then prompted for the following parameters (de fined on the previous page ):

■ Address selection method, or a ut horized MAC address

■ You are first prompted if you want to change the address selection method

or the authorized address. Press [Enter] or enter N to retain the current value. Enter Y to change the value and you are pro mpted t o select one of the following methods: – learn a ddress Continuously (enter C) – use First address heard (enter F) – Assign an address (enter A) – port security Off (enter O)

■ Send alarm when intruder detected

■ Eavesdrop preven tio n

SE and the port’s ID; for examp le, SE 4. The port’s

Note To enable security on a port, a t least one of the parameters, Send Alarm or

Eavesdrop Prevention, must be set to ON.

Configuring Security on All Twisted-Pair Ports

To set or change the security configuration for all the twisted-pair ports together, enter

Managing the Hub

same security configuration for all the twisted-pair ports, either at initial setup or when you want to change the configuration for all the ports. You are prompted whether to continue this process or not. If you choose to continue, you are then prompted for:

■ Address selection method:

If you select First heard for al l ports (F), learn continuo usly for all ports (C) , or security Off for all ports (O), the setting you select will be applied to all the

twisted-pair ports. If you enter F, the authorized address for each of the twisted-pair ports will be the source address in the first packet received from the attached devi ce. If you enter C, each of the twisted-pair ports will continuously update the authorized address when th e attached devices change. If y ou enter O, the security will be turned off for all the twisted-

3-16

SE ALL. This method is most useful when you are using the

Console Command Reference

Managing the Hub

pair ports; that is, the security parameters will all be set to NO (configured address selection methods, and learned or assigned addresses are not changed).

If you select

Port 1

2 3

For each port, enter an address selection method (

assign Each port (E), a table like the followin g is displayed:

ADDRESS SELECTION METHOD

CONTINUOUS CONTINUOUS CONTINUOUS

AUTHORIZED ADDRESS

NONE NONE NONE

F, C, or a MAC address

F, or C), or a specific

MAC address, or press [Enter] to retain the current value. Continue this process until all of the ports are displayed. If you do not want to configure all twisted-pair ports, note that you can terminate the address selection method by pressing [Enter] once. In either case, you are then prompted for the settings for the Send Alarm and Eavesdrop Prevention parameters, as described on the next page.

Managing the Hub

3-17

Managing the Hub

Console Command Reference

■ Send Alarm when intruder detected? and Eavesdrop prevention?:

These parameters are defined earlier in the chapter under “Security Configuration Parameter Definitions”.

The values you select for these parameters will be applied to all the twisted-pair ports fo r which you have selected (or retained) the address selection method.

Showing the Security Configuration

Enter the command SE SH to display the security configuration for all of the hubs ports. A table like the following is presented:

ADDRESS

Port

SELECTION METHOD

AUTHORIZED ADDRESS

EAVESDROP PREVENTION

SEND ALARM

DISABLE PORT *

1 2 3

CONTINUOUS CONTINUOUS FIRST HEARD

123456-890123 NONE 123456-789012

YES NO YES

NO NO YES

The vertical bar b etween Send Alarm and Disa ble Port indicates that the va lue for the Disable Port parameter is not directly configurable. This parameter is automatically set by th e Address Selection Method. If the method is either First Heard or Assigned, and if at least one of the other security parameters is set to YES, the Disable Port parameter will be YES. If the method is Continuous, the Disable Port parameter is always automatically set to NO .

Clearing Security Violation Indicators

Enter the command SE CL to clear any security violation indicators and to

Managing the Hub

“rearm” the indicators to be ready for the next intrusion. The indications are slightly different between port security violations and network management security violations, as describe d next.

For Port Security. The security violations are indicated by the Security LED and the LED for the affected port blinking simultaneously, and the intruder’s MAC address being added to the Status command screen for the affected port. Security violations occur when a non-authorized address is detected on a port and at least one of the intruder prevention parameters (Send Alarm or Disable Port) is set to YES.

3-18

Console Command Reference

For Network Management Security. The security viol ations are indicated

by the Security LED flashing and the violating network management station’s address being displayed on t he Status command screen.

A network management security violation occurs when a network management station that is not on the authorized management station list attempts to issue SNMP “set” commands to the hub, or when a network management station uses an invalid password (SNMP community name) to access the hub.

See the Managers command description, earlier in th is chapter, for information on the authorized management station list. By default, all network management stations are allowed to manage the hub. Under this configuration, network management security violations will not occur.

Notes If the port was disabled because of a security violation

(Disable Port = YES), to re-enable the port you must enter the port ON command for that port .

The Security Clear command does not remove the cause of the security violation, for example the wrong device being attached to a port. Until the cause is removed, the violation can reoccur immediately after issuing the SE CL command. It may appear as if the violation indication was nev er cleared.

Managing the Hub

SPeed <new speed>

Change the console port baud rate. Normally, the baud rate is automatica lly sensed. Use this command if you want to set the baud rate explicitly to 1200, 2400, 4800, 9600, 19200, or 38400. You will be prompted to set the terminal’s baud rate to the same speed and to press Enter for the prompt. Example SP 9600. (Sets the baud rate to 9600.)

STatus

To display status information for the hub. The status information includes:

■ the time elapsed since the last reset ( see the Reset command),

■ the hub’s MAC address,

■ if a network manageme nt security violation has occu rred, the MAC

Managing the Hub

address of the violating network management station,

3-19

Managing the Hub

Console Command Reference

■ Redundant Power Supply status:

• NOT CONNECTED means the RPS is not attached to the device.

• CONNECTED/FAULT means the RPS is attached but is reporting an

error.

• CONNECTED/GOOD means the RPS is attached with no errors, but

has not been enabled.

• CONNECTED/GOOD/ACTIVE means the RPS is attached with no

errors, and is active (the primary power supply is not operating and the RPS has been initiate d as a backup system).

■ a table with the port inf ormation described as follows:

Status Information

What It Means

Port The port ID. (Additionally, bkup indicates that the port is configured as the

Port Status The status of each port:

Link Beat Informs the hub of the presence of a device connected to it over twisted-

MAC address The unique 12-digit link-layer address for the hub. (Also called Ethernet

Managing the Hub

INTRUDER ADDRESS

backup link, pri indicates that the port is the primary link—see the Backup

command).

ON means the port is enabled and is not auto-s egmented. OFF means that the por t has been disabled by the Port command or

because of a security violation. PARTITIONED means the port has been auto- partitioned.

(See “Auto-Partitioning” in the

Product Description.

ON/REVERSED means that reversed wiring polarity on the receive pair has been detected on a twisted-pair cable and the hub has compensated.

pair cable.

address or physica l address.) The address of a dev ice not authorized t o access the hub.

)

chapter that provides information on the

3-20

Console Command Reference

Managing the Hub

TEstlink

To run a test of the link between the hub and another IEEE 802.3 device.

Note The destination device must be able to send an IEEE 802.2 Test Response

packet upon receipt of an IEEE 802.2 Test command packet. The HP Hub16M will respond with the correct packet.

You will be prompted for the 12-digit hexadecimal MAC address of the destination device. You will then be prompted for the number of test packets to send.

If any err ors are reporte d during thi s test, ther e may be a fau lt on the li nk being tested or on the destination dev ice. For more information about testing

network links, see the chapt er 2, “Troubleshooting”.

3-21

Managing the Hub

Cables and Connectors

This appendix lists cables that have been tested and verified for use with the HP Hub-16M. The following topics are covered:

■ recommended Ca bles

■ twisted Pair Cable/Connector Pinouts

■ RS-232 Connector and Cable Pinouts

It also includes minimum pin-out information so, if you wish to use an unlisted cable, you can verify that the cabl es used in your installation are correctly wired. Note that each pin-out does not necessarily match the pin-out for the corresponding HP cable, but cables manufactured to follow the minimum pinout will function correctly.

Recommended Cables

The following table shows PC connections to the RS-232 port.

Console PC connection to the RS-232 port: Purpose Cable Description Part No.

Connecting the PC directly to

the module’s RS-232 port

Connecting a modem to the hub’s RS-232 port

9-pin male RS-232 9-pin female to 9-pin

female null modem or “crossover” cable

25-pin male

25-pin female

25-pin fe male RS-232C 9-pi n female to 25-pin

RS-232C 9-pin female to 25-pin male null modem or “crossover” cable RS-232C 9-pin female to 25pin-female null modem or “crossover” cable

male standard modem or “straight-through” cable

F1047-80002 or F1047-60901 or 5182-4794

24542G (3 meters)

25442H (3 meter)

HP 24542M

Cables and Conn ectors

Recommended Cables

The following table shows net work connections to the hub.

Cable Function Cable Type HP Product Number

Network connections to the hub: Hub to end node

connection or hub to hub connection using the MDI/MDIX switch

Cables and Connectors

* The maximum total length of any twisted-pair segment is 100 meters.

Twisted-pair

“straight-throu gh” cable

92268A (4 pair, 4 meters) 92268B (4 pair, 8 meters) 92268C (4 pair, 16 meters) 92268D (4 pair, 32 meters) 92268N (4 pair, 300 meters)*

You can contact your HP authorized dealer or call HP at 1-800-538-8787 to order these parts.

A-2

Twisted-Pair Cable/Connector Pin-Outs

Cables and Connectors

Twisted-Pair Cable/Connector Pin-Outs

Twisted-Pair Cable for Hub-to-Computer Network Connection

To connect PCs or other network devices to the hub, use a “straight-through” 10Base-T cable. The twisted-pa ir wires must be twisted through the entire length of the cable. The wiring sequence must conform to AT&T 258A (not USOC). See “Twisted- Pair Cable Pi n Assign ment s” at the en d of this ch apte r for a listing of the signals used on each pin.

Cables and Connectors

Note Pins 1 and 2 must be a twisted pair.

Pins 3 and 6 must be a twisted pair. Pins 4, 5, 7, and 8 are no t used in this application , although the y may be wire d

in the cable.

A-3

Cables and Conn ectors

RS-232 Connecto r and Cable Pin-Outs

RS-232 Connector and Cable Pin-Outs

The Management Module’s RS-232 port connector is wired as depicted in the following table.

Cables and Connectors

PIN US CCITT DIN

1 DCD 109 M5 2 Rx 104 D2 3 Tx 103 D1 4 DTR 108 S1 5 GND 102 6 DSR 107 M1 7 RTS 105 S2 8 CTS 106 M2 9 RI 125 M3

Use the RS-232 port to connect a PC to be used as the console. To make this connection, you must use a null modem cable or you can use the minimum cable pin-out described below.

This appendix lists cables that have been tested and verified for use with the HP Hub-16M. It also includes minimum pin-out information so, if you wish to use an unlisted cable, you can verify that the cables used in your installation are correctly wired. Note that each pin-out does not necessarily match the pin-out for the corresponding HP cable, but cables manufactured to follow the minimum pin-out will fun ction correctly.

Note Incorrectly wired c abling is the most common cause of problems for LAN

communications. HP recommends that you work with a qualified LAN cable installer for assistance with your cabling requirements.

A-4

RS-232 Connector and Cable Pin-Outs

Cables and Connectors

Minimum Cable Pinout for ASCII Console Connection

Cables and Connectors

PC end

9-pin male

22Rx 33Tx 55GND

Hub end

9-pin male

RS-232 Modem Cable

Modem end 25-pin male

23Tx 32Rx 47RTS 58CTS 66DSR 75GND 8 1 CD OR DCD

20 4 DTR

Hub end

9-pin male Signal

22 9 RI 23 DRS–typically on V.24 (European) modems

(not connected)

A-5

Cables and Conn ectors

RS-232 Connecto r and Cable Pin-Outs

Twisted-Pair Cable Pin Assignments

Twisted-Pair Straight-Through Cable

Hub End (MDI-X) Computer or Transceiver End

Signal Pins Pins Signal

(MDI)

Cables and Connectors

(receive +)

(receive –) (transmit +) (transmit –)

1 2 3 6

(transmit +) (transmit –) (receive +) (receive –)

A-6

Specifications

Physical

Width: 42.5 cm (16.8 in) Depth: 23.8 cm(9.4 in) Height: 4.36 cm (1.7 in) Weight : 8 lbs and 7 oz. (8.7 lbs)

Electrical

The hub automatically adjusts to any voltage between 100-127 and 200-240 volts and either 50 or 60 Hz.

ac voltage: 100–127 volts 200–240 volts

Maximum current: 0.3A max 0. 2A max Frequency range: 50/60 Hz 50/60 Hz

The maximum current ratings represent the current that could be drawn with an external transceiver attached to the hub.

Environmental

Operating Non-Operating

Temperature: -5°C to 45°C (23°F to 113°F) -40°C to 70°C (-40°F to 158°F) Relative humidity:

(non-condensing) Maximum altitude: 3,000 m (9,843 ft) 3,000 m (9,843 ft)

10% to 95% at 40°C (104 °F) 10% to 90% at 65°C (149° F)

Specifications

Connectors

The RJ-45 twisted-pair ports are compatible with the IEEE 802.3 Type 10Base-T standard.

Electromagnetic

Specifications

Emissions: FCC part 15 Class A

EN 55022 Class A / CISPR-22 Class A VCCI Level I Complies with Canadian EMC Class A requirements.

Complies with Au stralia/New Ze al and EMC Class A r e qu ir e m en ts .

Immunity: See the Declaration of Conformity for details at the end of Appendix

G, “Safety and Regulatory Statements” in this guide .

Safety: IEC950/EN60950

CSA950 NOM-019-SCFI-1993

UL1950

B-2

Modem Configuration

Before installing the modems (one attached to the hub and one attached to the terminal/PC), configure them by either issuing the appropriate AT command or by setting the modem’s switches, as described in the tab les in the rest of this appendix.

Hayes Smartmodem Optima 28.8 (V.34) Hayes ACCURA 288 V.34 + FAX Hayes V-Series ULTRA Smartmodem 14400

At the hub end: Issue the following AT command:

At the user end: Issue the following AT command:

A0101: AT&FQ2&C2&D3S0=1&W0 (if &C2 gives error, use &C0)

Next Rev: AT&FQ2&C1&D3S0=1&W0

AT&FW1&C1&W

US Robotics Courier V.FC/V.34

At the hub end: Issue the following AT command:

A0101: AT&F&C0S0=1&W0

Next Rev: AT&F&C1S0=1&W0

At the user end: Issue the following AT command:

AT&F&W

Megahertz XJ2288 PCMCIA card modem

At the user end: Issue the following AT command:

AT&F\N0&W

Modem Configuration

Practical Peripherals PM288MT II V.34

At the hub end: Issue the following AT command:

At the user end: Issue the following AT command:

A0101: AT&F0&C2S0=1Q2&D3&W0 Next Rev: AT&F0&C1S0=1Q2&D3&W0

AT&F0&W0

Intel 14.4EX

At the hub end: Set the A/B switch to A

Issue the following AT comman d:

AT&F0&R1&W0

At the user end: Set the A/B switch to A

Issue the following AT comman d:

AT&F0&W0

Supra FAX 288

At the hub end: Issue the following AT command:

A0101: AT&F0&C0S0=1Q2&D3&K3&W0 Next Rev: AT&F0&C1S0=1Q2&D3&K3&W0

At the user end: Issue the following AT command:

AT&F0&W0

Modem Configuration

C-2

Network Addressing

This appendix describes how net work address information is obtained and used. Topics covered are:

■ Communications Between Hub and Network Management

Station

■ IPX Addressing for Nove ll NetWare

■ IP Addresses for IP and non-IP Net works

■ Using BOOTP

Communication Between the Hub and Network Management Station

The HP Hub-16M can be managed over the network by CiscoWorks network management software. These hubs can also be managed by any other network management product s that comply with the Simple Net work Management Protocol (SNMP) standard and have standard SNMP MIB-browser functionality.

The communication between the SNMP network management station and the hub takes place using the network layer prot ocols, IPX for Novell networks, or IP for TCP/IP networks.

Which protocol you use depends on th e protocol being used by the network management station. Additionally, if the network management station is on the other side of a router from your hub, the protocol you run on both the hub and the network ma nagement station depen ds on which protocol the ro uter can handle.

The network lay er communic ations requir e that the hub have a netwo rk layer address. This appendix provides some background information on IPX and IP addressing.

Network Addressing

IPX Addressing f or N ovell NetWare

IPX Addressing for Novell NetWare

The Novell NetWare network operating system uses a proprietary protocol called Internetwork Packet Exch ange (IPX). The IP X protocol firmware is always available on an HP Hub-1 6M ; i t beco m es ac ti ve wh e n the h u b gets a n IPX address. The IPX addre ss consists of a network number and a device identification. The address is automatic ally assigned to the hub as follows (no IPX configuration of the hub is necessary):

■ The network number is automat ically assigned by a router or file server

on the network that is running the IPX protocol.

■ The device identification is the hub’s MAC address (also known as the

Ethernet address or physic al a ddress). This address is a unique 12-digit hexadecimal number assigned to the hub at the factory.

IPX Addressing Notes:

Because the IPX address is assigned automatically, no IPX configuration is necessary; therefore no IPX configuration is provided on the hub console interface. By default, the hub is ready to be managed by an SNMP network management station th at is configured for IPX communications.

Network Addressing

IP Addresses for IP and Non-IP Networks

If you have chosen to manage your hub with an SNMP/IP network manager, your hub must be configured wit h an IP address. If your network will be connected with other networks that use IP addresses, you must use assigned IP addresses. Otherwise, you can build your own IP addressing scheme.

Globally Assigned IP Network Addresses

If you intend to connect your network to other networks that use globally administered IP addresses, Hewlett-Packard strongly recommends that you use IP addresses that have a network address assigned to you. There is a formal process for assigning unique IP addresses to networks worldwide. Contact one of the following co mp an i es:

D-2

IP Addresses for IP and Non-IP Networks

Country Phone Number/E-Mail/URL Company Name/Address

Network Addressing

United States/Countries not in Europe or Asia/Pacific

Europe +31 20 592 5065

Asia/Pacific domreg@apnic.net

1-703-742-4777 questions@int er nic.net http://rs.internic.net

ncc@ripe.net http://www.ripe.net

http://www.apnic.net

Network Solutions, Inc. Attn: InterNIC Registration Service 505 Huntmar Park Drive Herndon, VA 22070

RIPE NCC Kruislaan 409NL-1098 SJ Amsterdam, Th e Netherlands

Attention: IN-ADDR.ARPA Registration Asia Pacific Netw ork Info r m ati on Cen t er c/o Internet Ini tiative Japan, Inc. Sanbancho Annex Bldg. 1-4 Sanban- cho Chiyoda-ku Tokyo 102, Japan

For more information, refer to Internetworking with TCP/IP: Principles, Protocols and Architecture by Douglas E. Comer (Prentice-Hall, Inc.,

publisher).

Device IP Configuration

List all the manageable de vices on your network and the i r IP configuration. Make sure that ever y device has a unique IP address. Make sure that all devices on the network have the same subnet mask.

The IP configuration parameters are as follows: IP Address: The IP address of the hub is writ ten in the format X.X .X.X, where

each X is a dec imal number be tween 1 and 254. Eve ry IP address on a ne twork must be unique.

The default value, 0.0.0.0, disables IP communications. Subnet Mask: The bit mask defines which portion of the IP address is the

subnet address and is written in the format X.X.X.X. The default value is automatically generated and depends on the class of IP address that you entered. See your network administrator for the subnet mask address. All devices on your IP network must use the same subnet mask address.

Default Router: The routing IP address of the nearest router in your network. The default is 0.0.0.0. If no routers ar e in yo u r network, enter the IP add r ess of this device.

D-3

Network Addressing

Using BOOTP

Time To Live: The number of IP routers a packet is allowed to cross before the packet is d iscarded. The defaul t value i s 32. Incre ase this va lue if the hub is managed from a network management station that is more than 32 routers away. The maximum allowable value is 255.

Use the IP Configuration command in the ASCII consol e or CiscoView to specify IP addresses.

Using BOOTP

BOOTP (Bootstrap Protocol) is used to download network configuration data from a server (the BOOT P server) to the h ub. The conf igurat ion data th e hub retrieves from the BOOTP server is:

■ the IP address for the hub

■ the subnet mask for the subnet on w hich the hub is installed

■ the default router

If you have configured the hub’s I P parameters on a BOOTP server, you do not need to use the IPConfig command in the ASCII console. As shipped from the factory, the hub is configured to use BOOTP to retrieve the IP configuration information.

Network Addressing

The BOOTP Process

When the hub is po we red on, it broadc asts BOOTP requests that co ntain the hub’s MAC address. The BOOTP ser ver re ceiv es the requ est and sear ches its BOOTP table file for an entry that matches the hub’s MAC address. If a match is found, the confi g ur at io n data in the associated fi l e en tr y is r etu rn ed to th e hub as a BOOTP reply. For most UNIX systems, the BOOTP tab le is contained in the /etc/bootptab file. The example below applies to t he BOOTP table for UNIX systems.

D-4

Network Addressing

Using BOOTP

BOOTP Table File Entries

An entry in the BOOTP table file /etc/bootptab for an HP Hub-16M would be similar to the following:

hphub16M:\

ht=ether:\ ha=080009123456:\ ip=190.40.101.22:\ sm=255.255.255.0:\ gw=190.40.101.1:\ vm=rfc1048

Definitions of the table entry fields:

hphub16M is a user-defined symbolic name to help you find the correct section of the

bootptab file. If you have multiple hub s that will be using BOOTP to get their IP configuration, you should use a unique symbolic name for each hub.

ht is the “hardware type” tag. For the HP 10Base-T hubs, set this to ether (for

Ethernet). ha is the “hardware address” tag. Use the hub’s 12-digi t MAC address. ip is the IP address to be assigned to the hub . Enter the address in the dotted-

decimal format as shown in the example on the previous page. sm is the subnet ma sk of the subnet in which the hub is installed. gw is the IP address of the default router (or gateway) that allows the hub to

communicate with systems tha t are not on the local ne twork segment. If there

is no default router, do no include this tag. vm is a required entry tha t specifies the BOOTP re port format.

T hubs, you must set thi s parameter to

This tag must precede the

tag.

rfc1048.

For the HP 10Base-

Notes for the bootptab file:

■ Blank lines and lines beginning with the pound sign (#) are ignored.

■ Make sure you include a colon (:) and a backsla s h (\) as a continuation

indication at the end of each line except the last one. Each record is a single line. The colon (:) separates fields in the record. The backslash (\) indicates the current record continues on the next line as if there were no carriage return and linefeed characters.

■ Spaces are not allowed between the characters on a line.

■ Names, such as hphub16M must begin with a letter and can only cont ain

letters, numbers, periods, or hyphens.

Network Addressing

D-5

Backup Links

This chapter describes how to use Backup Links on the hub. Topics described include:

■ how backup links work

■ examples of backup links

■ configuring a backup link

■ identifying a backup link

■ indications of backup link activation

■ reactivating the primary link

How Backup Links Work

In some network configur ations a critical link exists, fo r example between two workgroups that regularly share or exchange data over the network. To maintain the integrity of such a critical link, the HP Hub-16M offer a backup link feature. A backup link is a separate cable run between two hubs that is automatically enabled if the connection designated as the primary link fails.

The hub on which the redundant link is configured (hub A in the illustration— the “Monitoring Hub”), is responsible for monitoring the link. It sends IEEE

802.2 Test packets to the hub at the other end of the link (hub B in the illustration—the “Remote Hub”) and looks for response packets from that hub. If the re sponse pac kets f ail to come back , the p rimary link is consid ered as having fa iled and the backu p lin k, whic h ha d not b een car rying a ny tr affic, is enabled automatically. If the pr imary link does fail, it is automatically disabled until it can be repaired an d re-enabled.

When the primary link is repaired, you must re-enable the primary port. It is not re-enabled automati cally. When the primary port is enabled, the backup port is automatically disabled and returned to backup mode. See “Reactivating the Primary Link” later in this appendix.

Backup Links

How Backup Links Work

Limitations

■ Each hub can monitor a single backup link (only one backup link can be

configured on each hub) . But, the hub may be at the remote end of one backup link and at the monitoring end of a backup link to a different hub.

■ A given hub should be connected to the remote end of no more than two

backup links. If it is functioning as the remote hub in more than two

Backup Links

backup links, it may not be able to respond to the test packets fast enough when there is a high leve l of data traffic on the network.

This ability to respond may be improved by increasing the time between test packet transmissions on the monitoring hubs. For all the backup links in which the remote hub is involved, the time configured on the monitoring hubs for those links should be increased by one second for each additional backup link beyond two links. Add one to this count if the remote hub is also functioning as a primary (monitoring) hub in a different link.

Additional Notes

■ Any port on the hub can be u sed for ei ther the pri mary link o r the back up

link.

■ Any combination of media types can be used as a backup link by using

the AUI port. This accepts fiber, thin coax, and twisted pair external transceivers.

■ The primary link and the backup link cabling should be run over different

paths (through different conduits, for example) to reduce the possibility that damage will occur to both cables simultaneously.

E-2

Examples of Backup Links

Backup Links

Examples of Backup Links

The Backup Link function allows you to specify a backup link between two devices in case the prim ary link fails. An example of a backup link is shown below.

Backup Links

Hub to a Server

Hub

Hub to a Switch

Primary Link (fiber)

Backup Link (twisted pair)

Server

Backup Link Primary Link

Switch

A backup link i s a separate path c onnected between th e hub and a device. Th e port through which the cable is connected between the two devices is automatically enabled if the connection designated as the primary link fails.

How the Backup Function Works

The hub on which the redu ndant link is configured is responsible for monitoring the link. It sends packets to the station at the other end of the link and looks for response packets from that station. If the response packets fail to come back, the primary link is considered as having failed and the backup link, which had not been car ry i ng an y traffic, is enab l ed au to matically. If th e primary link does fail, it is automatically disabled until it can be repaired and re-enabled.

E-3

Backup Links

Examples of Backup Lin k s

When the primary link is repaired, you must re-enable the primary port. It is not re-enabled automati cally. When the primary port is enabled, the backup

port is automatically disabled and returned to backup mode. See “Reactivating the Primary Link” later in this appendix.

Note ■ Any combination of media types ca n be used as a back up link by attach ing

Backup Links

an external transce iver to the AUI por t. This port accep ts fiber, thin co ax, twisted-pair external transceivers. For example, a thin coax link from the ThinLAN port can act as a backup link to a twisted-pair link.

■ The hub can monitor only one link.

■ The remote device should have no more than 2 backup links connected

to it from a monitoring hub. If the remote device has more than 2 backup links functioning, it may not be able to respond to the test packets fast enough when there is a high level of data traffic on the network segments.

■ This ability to respond may be improved by increasing the time between

test packet transmissions on the monitoring hubs. For all the backup links in which the remote device is involved, the time configured on the monitoring hubs for those links should be increased by one second for each additional backup link beyond two links. Add one to this count if the remote device is also functioning as a primary (monitoring) hub for a different link.

Suggestion The primary link and the backup link cabling should be run over different

paths (through different conduits, for example) to reduce the possibility that damage will occur to both cables simultaneously.

E-4

Configuring a Backup Link

Backup Links

Configuring a Backup Link

Configure the Monitoring Hub Only. All configuration of the backup links feature is performed from CiscoView or the ASCII console. On the

“remote” device, you only need to make sure the ports used for the primary and backup links are both enabled.

Use the Backup Function. To configure this link, you use the Backup function in the ASCII co nsole. You provide the following information:

■ the device and port to be used for the backup link

■ the device and port to be used for the primary link

■ the MAC address of the device at the remote end of the link

■ how frequently (in seconds) test packets (used to check the status of the

primary link) should be sent to the remote device

■ how many consecutive response failures will trigger activation o f the

backup link

Backup Links

Configuration/Installation Sequence

If a hub is installed in a network that includes two connections to another hub, and the backup link has not yet been configured, a loop in the network now exists that will cause some network performance degradation. For this reason, it is better to configure the backup link on the hub before the hub is installed in the network. It is best to follow these steps:

1. Attach a PC running an ASCII terminal emulator to th e hub an d sta rt th e ASCII terminal emulator.

2. Use the Backup function to configure the backup link.

3. Complete the network cable connections between the monitoring hub and the remote devi ce. For cab ling instruct ions, see Appen dix A, “Cab les and Connectors,” in this manual.

4. On the remote device, make sure that the ports connected to both the primary and backup links are enabled. On the monitoring hub, the status of the primary and backup ports is controlled by the hub’s firmware; you do not need to explicitly enable the monitoring hub’ s ports.

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Backup Links

Identifying the Backup Link

5. Enable the primary port in software. This step is necessary because until you have completed st ep 3 (connecting the cable s), the test packets cannot be successfully se nt through the primary port. The primary port will therefore be disabled and the backup port will be activated. Once you enable the primary port, it assumes the active role.

Backup Links

Identifying the Backup Link

The ports designated as the pr imary and backup ports are identified in:

■ the CiscoView Backup function window.

■ ASCII console interface by usin g th e Back up co mm an d

The primary port is identif i ed by (pri), the backup port by (bkup).

Indications of Backup Link Activation

E-6

When the primary link fails (“n” consecutive test packet responses were not received on the primary port from the other device), the backup link is automatically enabled. The effect of this change is displayed on the monitoring hub's LEDs and management interface. Activation of the backup link does not change the status of any of the ports on the remote device.

On the monitoring hub's LEDs, the primary port LED goes off, and the backup port LED goes on.

In the ASCII console or CiscoView, the status of the primary port changes from “active” to “n ot active”, and th e backup port chan ges from not activ e to active. See the ASCII console help or CiscoView online help for more information.

Reactivating the Primar y Link

Backup Links

Reactivating the Primary Link

When the prim ar y l i n k i s repaired, yo u c an u s e a n y o f t he following me th od s to re-enable the primary port:

■ From the ASCII console, select “Port/Segment Conf iguration”, then

“Disable and enable ports option”, then enable ports.

■ From CiscoView, re-enabl e the primary port. See the network manage-

ment product documentation f or details on how to enable a port.

■ Power-cycle the hub.

When the primary port is re-enabled, the backup port is automatically disabled and returned to backup mode.

Backup Links

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Security Information

This section describes how to set security for your product. It covers the following topics:

■ how intruder prevention works

■ how eavesdrop prevention works

■ setting inbound security with intruder prevent i on

■ setting outbound security w ith eavesdrop prevention

Understanding Network Security

In addition to password pro tection and network access protection, the HP Hub-16M provides two major types of per-port security:

■ Intruder Prevention for inbound data (from the en d user to the hub).

■ Eavesdrop Prevention for outbound data (from the hub to the end user).

Both of these types of security can be configured on each port individually (all twisted-pair ports and the AUI port through the SEcure command on the ASCII console interface. These per-port security features are enabled by comparing the source and destination address of each p ac ket received or

transmitted by the hub to each por t’ s Authorized MAC address—the MAC address of the device that is authorized to communicate through that hub port. These features can be seen through the CiscoView network management application.

Security Information

How Intruder Pr evention Works

How Intruder Prevention Works

Intruder Prevention stops an unauthorized computer (or other device) from actively gaining access to the network. When a port is configured for Intruder Prevention, the hub examines the source address of each packet coming in through that port and compares it with the authorized MAC address. If the addresses are not the same, the hub concludes that an intruder is attempting to gain access to the network and takes the appropriate action (as configured): either disabling the port, sendin g an alarm to the net work management

station, or both. See “Setting Inbound Security with Intruder Prevention” later in this appendix.

How Eavesdrop Prevention Works

Security Information

Eavesdrop Prevention stops a computer (or other device) from seeing network traffic that is not intended for that port. When Eavesdrop Prevention is configured on a port, the hub compares the port’s authorized MAC address with the destination address of any outbound packet. If the addresses match, the hub concludes that the packet is destined for the computer attached to the port, and it sends the packet out through the port unaltered. However, if the addresses do not match, the hub prevents the computer from seeing the packet’s contents by substituting a meaningless string of 1’s and 0’s. Note that

broadcast and multicast packets are repeated to all the ports, even when Eavesdrop Prevention is activated. See “Setting Outbound Security with

Eavesdrop Prevention” later in this appendix.

F-2

Authorized MAC address

To provide data security on a hub port, a single, unique MAC address must be configured as the authorized MAC address for each port. You can configure the authorized MAC addr ess either by assigning it or by designating the port to learn it automatically. This configuration is performed with the Secure command from the hub’s console. See the Secure command description in the chapter on Managing t he Hub.

How Eavesdrop Pre v ention Works

Security Information

Assigning the Authorized MAC address

You can assign an authoriz ed MAC address by enteri ng it manually at the hub console interface or at the net work managem ent station. Assigning a spe cific

address provides the maximum control of the port’s authorized MAC address. The Intruder Prevention and Eavesdrop Prevention security that you have configured for that port is implemented as soon as the address is assigned.Learning the Authorized MAC address

You can set the hub to learn a port’s authorized MAC address automatically by using either a “first heard” or a “learn continuous” method. The method used to learn the authorized MAC address should be chosen based on the level of data security required on a port. In each case, the security configuration for that port is implemented when the port receives a packet from the attached device. It learns the device’s address from the source address field in the packet.

First-Heard Method. The “first heard” method automatically assigns the first address detected on the port as the authorized MAC address. This method is useful to quickl y identify a nd author ize end users whose po rts may re quire both Eavesdrop Prevention and Intruder Prevention. Under this method, the port will be disabled automatically if an intruder is detec ted on the port.

Security Information

Learn-Continuous Method. The “learn continuous” method allows the hub to continuously update the authorized MAC address configured for a port. Each new device conn ected to the port becomes th e ne w au th or iz ed dev ice. This security method is useful for dynamic workgroups that experience frequent changes to end-user configuration and bu t require minimal data security protection. In the “le arn continuous” mode, the port may be configured to provide the Eavesdrop Prevention data security and the send-alarm security violation notification. Under this method, the port will not be disabled if an intruder is detected.

F-3

Security Information

Setting Inbound Security with Intruder Prevention

The picture below illustrates the use of inbound security using Intruder Prevention. This type of data security allows only one authorized user per port to access the networ k. The authorized user is id entified by the authorized MA C address of the end node attached to the port.

Intruder prevention includes an “auto port disable” data security feature and a “send alarm” security violatio n notification feature. These features are described on the next page.

Security Information

F-4

In the above illustration, the authorized end user is represented by PC 101, and the intruder is represented by PC 202 (Intruder). (For illustration purposes, the number s 101, and 202 are used to repr esent 12-digit hexadecimal MAC addresses.) Th e HP h ub co mp a res the authori zed M AC ad dr ess, 101, to the source address of the packet received from the Intruder, 202. The hub detects the unauthorized MAC address and automatically disables the port, and sends an alarm (a security violation trap notification) to the authorized network management station.

Setting In bound Security with Intruder Prev ention

Security Information

Auto Port Disable

Any port may be configured to be disabled automatically when an intruder’s MAC address is detected. This feature is automatically controlled by your selection of the Authorized Address Selection Method for the port: If the address used is the “first heard” or an “assigned” address, the port will be disabled automati cally when an int ruder is detected . If the address is “l earned continuously”, the port will not be automatically disabled.

Note Auto port disable may not be used on cascaded ports, ports connected to a

network with multiple end users, or ports configured to learn the authorized MAC address continuou sl y.

The auto port disable feature compares the authorized MAC address of the port to the source address of the packet inbound to the hub at that port. If the authorized address and the source address do not match, the HP hub will automatically disable the port.

Once a port is disabled because of a sec urit y violation, to resume operation, the port must be re-enabled either by using the hub co nsole interface’s Port command, or from the net work management station.

Security Information

A bit error in the source address field of the packet will not cause the port to be disabled. In this case, the hub detects a CRC error for the packet and does not consider it as a security violation.

Send Alarm

Any port may be configured to send an alarm (trap notification) to the network management station when an unauthorized MAC address or a new MAC address is detected on a secure port.

To use the “send alarm” feature, you must authorize at least one network management station to receiv e the trap notification s by entering the IP or IPX address of the network ma na gem en t stat io n in t he autho riz e d ma na ger s li st. Use the Managers command from the hub’s console to configure these addresses. See chapter 3, “Managing the Hub” for more information on this command.

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Security Information

Setting Outbound Security with Eavesdrop Prevention

Eavesdrop Prevention allows a port to receive a packet transmitted on the

network as valid data only if the port ’s MAC address matches the packet’s destination address. If the port’s MAC address does not match the packe t destination address, the port will re ceive a packet containing a meaningless data field of alternating 1’s and 0’s. Multicast and broadcast packets are transmitted to all ports unm odified.

Note that sending a packet containing alternating 1’s and 0’s will continue to allow the port to detect the traffic on the network, so that the CSMA/CD network requirements are met. However, the port will correctly record the invalid data packet received as a CRC error. An end-user attached to an HP hub implementing Eavesdrop Prevention data security will normally record a high number of CRC errors on the computer card statistics.

Security Information

The illustration on the next page sho ws the use of outbound data security using Eavesdro p Pre venti on. This typ e of da ta secu rit y shoul d b e ena ble d on any port that is to receiv e data on a “n eed to kn ow” basis . The port must have an authorized MAC address configured and must be connected to only one end-user.

F-6

Eavesdrop Prevention may not be used on cascaded ports, o r ports connected to a network with multiple end users.

In the illustration below, Server 104 is transmitti ng a packet destined for PC

101. (For illustration purposes, the numbers 101, 102, 103, and 104 are used to

represent 12-digit hexadecim al MAC addresse s.) The port s for PC 101 and PC 102 have Eavesdrop Pr evention en abled or con figured ON. Because PC 101’ s MAC address matches the packet destination address, it receives the packet unaltered. However, PC 102’s MAC address does not match the packet destination address and therefore it receives a useless packet (the packet data field contains a meani ngless patter n of alte rnating 1’s and 0’s.) The port f or PC 103 does not have Eavesdrop Prevention enabled and therefore PC 103 receives the packet unaltered from Server 104.

Setting Outbo und Security with Eavesdrop Prevention

Security Information

F-7

Safety and Regulatory Stat em ents

This chapter covers the following topics:

■ mounting precautions

■ power precautions

■ safety and regulatory statements

■ Declaration of Conformity

Mounting Precautions

When you put a hub into a rack, follow t hese mounting precautions:

■ The rack or cabinet should be adequately secured to prevent it from

becoming unstable and/or falling over. The hub should be mounted in a position toward the bottom of the rack for stability and to make it easier to stack the other hubs on top.

■ Before mounting a hub, plan its location and orientation relative to other

devices and equip ment. Also co nsider the ca bling that will be attac hed to the hub and the ports that will be used. Verify that there is room for the grouped cables to trail out from the side of the hub. Allow at least 2.54 cm (1 inch) in the front of the hub. In the back of the hub, allow at least 3.8 cm (1 1/2 inches ) of space for the power cord. If yo u are using a Redundant Power Supply, allow the appropriate amount of space for the RPS connector.

■ Ensure that the HP Hub- 16M does not overload the p ower circuits, wiring,

and over-current protection. To determine the possibility of overloading the supply circuits, add together the amperage ratings from the nameplates of all your hubs (and oth er equipment) installed on the same circuits and compare the total with the r ating limits for the supply circuits.

■ Make sure that the power source circuits are properly grounded, then use

the supplied power cord to connect the HP Hub-16M to the circuit. See the Safety Statements in this chapter.

■ Do not block airflow ar ound the side and the back of the unit.

Safety and Regu latory Statements

Power Precautions

Note If your install ation req uires a di fferent power co rd than th e one suppl ied with

the hub, be sure to use a power co rd displayin g the mark of the safet y agency that defines the regulations for power cords in your country. The mark is your assurance that the power cor d can be used safely with the hub.

■ Do not install the hub in an environment where the operating ambient

temperature mi gh t ex cee d 45° C (1 13 ° F) .

■ Make sure the air flow around the sides of the hub is not restricted.

Power Precautions

Follow these precautions when unplugging and plugging in power to the hub as well as adding or removing modules.

Note The hub does not have a power switch; it is powered on when the power cord

is plugged in. The hub’s po wer suppl y automati cally ad justs to an y AC powe r source between 100-127 volts and 200-240 volts. There are no voltage range settings to configure.

Safety and Regulatory

When installing the hub, note that the AC outlet must be installed near the equipment and should be easily accessible.

Statements

G-2

Safety Information

Documentation reference symbol. If the product is marked with this symbol, refer to the product documentation to get more information about the product .

Safety and Regulator y Statements

Safety Information

WARNING A WARNING in the manual denotes a hazard that can cause injury

or death.

CAUTION A CAUTION in the manual denotes a hazard that ca n damage

equipment. Do not proceed beyon d a WARNING or CAUTION notice until you

have understoo d the hazardous conditions and have taken appropriate steps.

Grounding

These are safety class I p roducts and have protective earth ing terminals. There must be an uninterruptible safety earth ground from the main power source to the product’s input w iring terminals, power cord, or supplied power cord set. Whenever it is likely that the protection has been impaired, disconnect the power cord until th e ground has been restored.

For LAN cable grounding :

■ If your LAN covers an area served by more than one power distribu-

tion system, be sure their safety grounds are securely interconnected.

■ LAN cables may occasionally be subject to hazardous transient volt-

ages (such as lightning or disturbances in the electrical utilities power grid). Handle exposed metal components of the network with caution.

Servicing

There are no user-serviceable parts inside these products. Any servicing, adjustment, maintenance, or repair must be performed only by service-trained personnel.

Safety and Regulatory

Statements

These products do not have a power switch; they are p o wered on when the power cord is plugged in.

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Safety and Regu latory Statements

Informations concernant la sécur ité

Informations concernant la sécurité

Symbole de réfé rence à la docum entatio n. Si l e produi t est mar qué de ce symbole, reportez-vous à la documentation du produit afin d'obtenir des informati ons plus détaillées.

Safety and Regulatory

WARNING Dans la documentation, un WARNING indique un danger susceptible

CAUTION Un texte de mise en garde intitulé CAUTION indique un danger suscep-

Cet appareil est un pr oduit de classe I et possèd e une borne de mise à la ter re. La source d'alimentation princ ipale do it être munie d'une prise de terre de sé curité ins tallée aux bornes du câblag e d'entrée, sur le cordon d' alimentation ou le cordon d e raccordement fourni avec le produit. Lorsque cette protection semble avoir été endommagée, débrancher le cordon d'alimentation jusqu'à ce que la mise à la terre ait été réparée.

Mise à la terre du câble de réseau local:

■ si votre réseau local s'éte nd sur un e zone de sservie par plus d'un systè me de

distribution de puissance, assurez-vous que les prises de terre de sécurité soient convenablement interconnectées.

■ Les câbles de r éseaux locaux peuvent occasionnellement être soum is à des

surtensions transitoires dangereuses (telles que la foudre ou des perturba-

Statements

tions dans le réseau d'alimentation public). Manipulez les composants métalliques du réseau avec précautions.

Aucune pièce conte nue à l'intérieur de ce produit ne peut être réparé e par l'utilisat eur. Tout dépannage, régl age, entretien ou réparation dev ra être confié exclusivem ent à un personnel qualifié.

d'entraîner des do mmages corporels ou la mort.

tible de causer des dommages à l'équipement. Ne continuez pas au- delà d'une rubriq ue WARNING ou CAUTI ON

avant d'avoir bien compris les conditions présentant un danger et pris les mesure s ap propriées.

Cet appareil ne comporte pas de commutateur principal ; la mise sous tension est effectuée par branchement du cordon d'alimentation.

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Hinweise zur Sicherheit

Symbol für Dokumentationsverweis. Wenn das Produkt mit diesem Symbol markiert ist, schlagen Sie bitte in der Produktdokumentation nach, um mehr Informat ionen über das Produkt zu er halten.

Safety and Regulator y Statements

Hinweise zur Sicherheit

WARNING Symbol für Dokumentationsverweis. Wenn das Produkt mit diesem

Symbol markiert ist, schlagen Sie bitte in der Produktdokumentation nach, um mehr Informat ionen über das Produkt zu er halten.

CAUTION Symbol für Dokumentationsverweis. Wenn das Produkt mit diesem

Symbol markiert ist, schlagen Sie bitte in der Produktdokumentation nach, um mehr Informat ionen über das Produkt zu er halten.

Fahren Sie nach dem Hinweis WARNING oder CAUTION erst fort, nachdem Sie den Gefahrenzustand verstanden und die entsprechenden Maßnahmen er griffen haben.

Dies ist ein Gerät der Siche rheit sklass e I und v erfügt üb er ei nen schü tzend en Erd ungsterminal. Der Betrieb des Geräts erfordert eine ununterbrochene Sicherheitserdung von der Hauptstromquelle zu den Geräteingabeterminals, den Netzkabeln oder dem mit Strom beliefer ten Ne tzk abelsa tz vor aus . Soba ld Gr und zu r Ann ahme be st eht, da ß der Schutz beeinträchtigt worden ist, das Netzkabel aus der Wandsteckdose herausziehen, bis die Erdung wiederhe rge stellt is t.

Für LAN-Kabelerdung:

■ Wenn Ihr LAN ein Gebiet um faßt, das v on meh r als ein em Strom v er te ilun gs-

system beliefert wird, müssen Sie sich vergewissern, daß die Sicherheitserdungen fest untereinander verbunden sind.

■ LAN-Kabel können gelegentlich gefährlichen Übergangsspannungen aus-

gesetzt werden (beispielsweise durch Blitz oder Störungen in dem Starkstromnetz des Elektrizitätswerks). Bei der Handhabung exponierter Metallbestandteile des Netzwerkes Vorsicht walten lassen.

Safety and Regulatory

Statements

Dieses Gerät enthält innen keine durch den Benutzer zu wartenden Teile. Wartungs-, Anpassungs-, Instandhaltungs- oder Reparaturarbeiten dürfen nur von geschultem Bedienungspersonal durc hg efü hrt werd en .

Dieses Gerät hat keinen Netzschalter; es wird beim Anschließen des Netzkabels eingeschaltet.

G-5

Safety and Regu latory Statements

Considerazioni sulla sicurezza

Simbolo di riferimento alla documentazione. Se il prodotto è contrassegnato da qu esto simbolo, f are riferimento a lla documentazio ne sul prodotto per ulter iori informazioni su di esso.

Safety and Regulatory

WARNING La dicitura WARNINGdenota un pericolo che può causare lesioni o

CAUTION La dicitur aCAUTION denota un pericolo che può danneggiare le

Questo prodotto è omologato nella classe di sicurezza I ed ha un terminale protettivo di collegament o a terra. Dev'ess ere installato un col legamento a terr a di sicurezza, non interrompibile che vada dalla fonte d'alimentazione principale ai terminali d'entrata, al cavo d'alimentazione oppure al set cavo d'alimentazione fornito con il prodotto. Ogniqualvolta vi sia probabilità di d anneggiamento della protezione, disinserite il ca vo d'alimentazion e fi no a qua nd o il colle gaento a terra non sia stat o ri pris t ina t o.

Per la messa a terra dei cavi LAN:

■ se la vostra LAN copre un'area servita da più di un sistema di distribuzione

elettrica, accertatevi che i collegamenti a terra di sicurezza siano ben collegati fra loro;

■ i cavi LAN possono occasionalmente andare soggetti a pericolose tensioni

Statements

transitorie (ad esempio, provocate da lampi o disturbi nella griglia d'alimentazione della società elettrica); siate cauti nel toccare parti esposte in metallo della rete.

Nessun componente di questo prodotto può essere riparato dall'utente. Qualsiasi lavoro di riparazione, messa a punto, manutenzione o assistenza va effettuato esclusivamente da personale specializzato.

morte.

attrezzature. Non procedere oltre un avviso di WARNING o di CAUTIONprima di

aver compreso le condizioni di rischio e aver provveduto alle misure del caso.

Questo apparato non possiede un commutatore principale; si mette scotto tensione all'inserirsi il cavo d'alimentazione.

G-6

Safety and Regulator y Statements

Consideraciones sobre seg ur idad

Consideraciones sobre seguridad

Símbolo de referencia a la documentación. Si el producto va marcado con este símbolo, consultar la documentación del producto a fin de obtener mayor información sob r e el producto.

WARNING Una WARNING en la documentación señala un riesgo que podría

resultar en lesiones o la muerte.

CAUTION Una CAUTION en la documentación señala un riesgo que podría

resultar en averías al equipo. No proseguir después de un símbolo de WARNING o CAUTION hasta

no haber entendido las condiciones peligrosas y haber tomado las medidas apropiadas.

Este aparat o se enmar ca dentro de la clase I de segu ridad y se encuentra protegido p or una borna de pu esta a tie rra. Es prec iso que e xi sta una pues ta a tie rra conti nua desde

la toma de alimentación eléctrica hasta las bornas de los cables de entrada del aparato, el cable de alime ntación o el juego de cable de alimenta ción sumini strado . Si existe la probabilidad de que la protección a tierra haya sufrido desperfectos, desenchufar el cable de alimentación hasta haberse subsanado el problema.

Puesta a tierra del cable de la red local (LAN):

■ Si la LAN abarca un área cuyo suministro eléctrico p roviene de más de una

red de distribución de electricidad, cerciorarse de que las pu estas a tierra estén conecta da s en t r e sí de mo do seguro.

■ Es posible que los cables de la LAN se vean somet idos de vez en cuando a

voltajes momentáneos que entrañen peligro (rayos o alteraci ones en la red de energía eléctrica). Manejar con precaución los componentes de metal de la LAN que estén al descubierto.

Este aparato no contiene pieza alguna susceptible de reparación por parte del usuario. Todas las reparaciones, ajustes o servicio de mantenimiento debe realizarlos solamente el técnico.

Safety and Regulatory

Statements

Este producto no tiene interruptor de potencia; se activa cuando se enchufa el cable de alimentación.

G-7

Safety and Regu latory Statements

Safety Information (Japanese)

Safety and Regulatory

Statements

G-8

Safety and Regulator y Statements

Regulatory St atements

Regulatory Statements

FCC Class A Statement (for U.S.A. Only)

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 prov ide reasonabl e protection against harmfu l interference wh en 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 instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area may cause harmful interference in wh ich case the user wi ll be required to correct the interference at his own expense.

VCCI Class 1 (For Japan Only)

European Community

This equipment complies with ISO/IEC Guide 22 and EN55022 Class A with unshielded cables and EN55022 Note

With unshielded cables this is a Class A product. In a domestic environment, this product may cause radio interference, in whic h case the user may be required to take adequate measures.

Canada

This product complies wit h Class A Canadian EMC requir ement.

G-9

Safety and Regulatory

Statements

Safety and Regu latory Statements

Declaratio n of Conformity

Declaration of Conformity

The followi ng Declaration of C onformity for th e HP J3188A Hub-16M co mplies with ISO/IEC Gu ide 22 an d EN 45 014. The decl aration identi fies the product ,

the manufacturer’s name and address, and the specifications that are recognized in the European community

Safety and Regulatory

Statements

G-10

Index

Numerics

50-ohm terminator

for a ThinLAN cable segment … 1-10

Activity LED … 1-4, 1-12, 2-5 address selection method … 3-14 ASCII console … 3-1 AUI/Xcvr LED … 1-13 Authorized MAC address

assigning an address… 3-15 methods for selecting … 3-14

authorized MAC address … F-2

assigning … F-3

learning … F-3 Auto port disable, security feature … 3-14, 3-18 auto port disable, security feature… F-5

BAckup command … 3-5 Backup command … 3-5 backup link

configuration process … E-5

description … E-3

identification… E-6

indications of activation … E-6

limitations … E-2, E-4

operational notes… E-2, E-4

reactivating the primary link … E-7 Backup port… 3-5 BOOTP … 3-8, D-4

example BOOTP table entry … D-5 broadcast packets definition … 3-6

cabinet mounting

instructions for… 1-5 cables

network connections … A-2

RS-232 console port … A-1

twisted-pair connector pin-outs… A-3

CDpstatus command … 3-6 clearing a password … 2-5 Collision LED… 1-4, 1-12, 2-3 collision monitori ng… 3-13 collision s definition … 3-6 command … 3-9 commands

BAckup … 3-5 COunters … 3-6 DIsconnect… 3-7 HElp … 3-4, 3-6, 3-11 IPconfig … 3-7 PIng … 3-12 POrt … 3-13 REset … 3-13 RObustness … 3-13 SEcure … 3-14 SPeed… 3-19 STatus … 3-19

TEstlink… 3-21 configuring a backup link… E-5 Connecting a console

using a terminal connected directly … 3-2 connections

hub to hub networking … 1-8

network … 1-7 connector specifications… B-2 Console

commands … 3-4

connecting a terminal directly … 3-2

starting a session … 3-1

syntax conventions for commands … 3-4 console

cables for connecting to RS-232 port … A-1 console commands … 3-4 console, using … 3-3 counter definitions… 3-6 COunters command … 3-6 countries

power cords for … 1-2 CRC Errors definition … 3-6

Index – 1

diagnosing with the LEDs … 2-2 diagnostic tests

testing the hub only … 2-5

DIsconnect command … 3-7

Eavesdrop prevention

configuration … 3-15 eavesdrop prevention … 3-14, F-2 electrical specifications … B-1 electromagne tic specifications … B-2 environmental specifications … B-1 Ethernet address

MAC address … 3-8 Ethernet networks … iii examples

backup links… E-3

BOOTP table entry … D-5 external power supply … 1-2

Fault LED… 1-4, 1-12, 2-3 features

hub … iv fiber-optic backbone… 1-11 firmware enhancements … 2-6 first heard method… F-3 front of the hub

status LEDs… 1-12

giant packets def inition … 3-6

HElp command … 3-4, 3-6, 3-11 Help command… 3-4 HP AdvanceStack SNMP Module

LED pattern during self-test … 2-3 HP Management Module

cables for … A-1

hub

at a glance … iii connecting to fiber-optic backbone … 1-11 description … iii features… iv mounting … 1-5 reference … 1-12 ThinLAN connections … 1-9 troubleshooting… 2-1

hub operation

verifying … 1-2

hub to hub network connections

with the MDI switch … 1-8

IEEE 802.3 Type 10Base-T standard… iii included parts… 1-2 installing the hub

mounting pro cedures … 1-5 network connections … 1-7

verifying hub operation … 1-2 intruder … F-4–F-5 intruder prevention… F-2 iontelligent partition recovery … 3-13 IP address… D-2 IP parameters … 3-8 IPconfig command … 3-7 IPX address … D-2

late collision monitoring… 3-13 LED pattern … 1-4 LEDs

Activity … 1-12

AUI/Xcvr … 1-13

Collision … 1-12

diagnosing the hub status … 2-2

during self test … 1-4

patterns showing error conditions … 2-3

Power … 1-12

twisted-pair ports … 1-13

verifying hub operation … 1-4 list

included parts… 1-2

2 – Index

MAC address

use in IPX address … 3-8, D-2 MAnagers command … 3-9 MDI switch

using … 1-8 MDI-X switch

using … 1-8 MEssageinterv al co mm and … 3-11 modem … 3-3

configuration … C-1 modem cable pin-out … A-5 monitoring

late collision… 3-13 mounting the hub … 1-5

in a rack or cabinet … 1-5

NEighbor command … 3-11 network addr essing

IP address … D-2

IPX address … D-2 network connections … 1-7

hub to hub connections … 1-8

port connections … 1-8 Network management

security violations… 3-19 network management

communication with the hub… D-1 network management, configuration … 3-8 Novell NetWare … D-2

outbound … F-6 out-of-band managem ent

RS-232 port pin-out… A-4

partition recovery … 3-13 parts list … 1-2 Password, clearing … 2-5 Physical address

MAC address … 3-8 physical specifications of hubs … B-1 PIng command … 3-12

pin-outs

minimum cable… A-5 POrt command… 3-13 Port LED … 1-13 Port LEDs … 1-4, 2-3 port LEDs

twisted-pair … 1-13 ports

connection procedures … 1-8 power cord

plugging into the hub … 1-2

plugging into the wall … 1-3 Power LED … 1-4, 1-12, 2- 3 power-on … 1-4 procedures

configuring a backup link… E-5

network connections to the hub… 1-7

network port connections… 1-8

rack mounting… 1-5

instructions for… 1-5 recommended cables

description … A-1 recovery

intelligent partition… 3-13 Redundant Power Supply… 1-3 remote connect ions … 3-2 REset command … 3-13 resetting the hub

troubleshooting procedure … 2-5 RJ-45 jack … 1-8 RObustness command … 3-13 RPS LED… 1-12, 2-3

SEcure command … 3- 14 Security

auto port disable… 3-14

clearing the violation indicators… 3-18

configuring a sing le port… 3-16

configuring all twisted-pair ports… 3-16

eavesdrop prevention … 3-15

network management se cur ity viola tio ns… 3-19

send alarm… 3-15

showing the current configuration … 3-18

Index – 3

security

authorized … F-2 auto … F-5 detailed description… F-1 eavesdrop … F-2 intruder … F-2

send alarm … F-5 Security LED… 1-4, 1-12, 2-3 security parameters … 3-14 Security violati on indicators

clearing … 3-18

network management se c ur ity v iol ations … 3-19

port security violations … 3-18 Security, configuring on single port… 3-16 security, configuring on twisted-pair ports… 3-16 Self Test … 2-3 Self test

LED pattern during … 1-4 send alarm … F-5 Send alarm, security parameter

configuration … 3-15 commands

MAnagers … 3-9 MAnagers … 3-9 specifications … B-1

connectors … B-2

electrical … B-1

electromagnetic … B-2

environmental … B-1

physical … B-1 SPeed command… 3-19 Starting a console session … 3-1 STatus command … 3-19 status LEDs

description … 1-12 Syntax conventions for console commands… 3-4

ThinLAN port

and 50-ohm terminator… 1-10

troubleshooting

approaches … 2-1 diagnosing wi th the LEDs… 2-2 LED patterns showing errors … 2-3 testing the hub … 2-5

twisted-pair cable

hub-to-computer connection … A-3 pin assignments … A-6 pin-outs … A-3

twisted-pair ports

LED description … 1-13

verifying hub operation … 1-2

table mounting … 1-6 Telnet session

establishing… 3-2 terminator

for a thin LAN segment… 1-10 TEstlink comm and … 3-21 ThinLAN Co nnection … 1-9 ThinLAN connections … 1-9

4 – Index

Technical information in this document is subj ect to change without notice.

Manual Part Number J3188-90001

*J3188-90001*

HP 10Base-T Hub-16M Installation And Reference Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

HP 10Base-T Hub-16M

HP 10Base-T Hub-16M (J3188A)

Back of the Hub

Features

Installing and Configuring Your Hub

1. Verify included parts

Rack or Cabinet Mounting

Table Mounting

Connecting Devices to the Hub

Connecting Hubs Together

Twisted-Pair Cascade Connections

ThinLAN Connections

Interpreting LED Status

Connecting the Hub-16M to a Fiber-Optic Backbone

Interpreting Hub Status LEDs

Interpreting Port Status LEDs

Troubleshooting Approaches

Using a Checklist to Diagnose the Hub

LED Operation

Hub Maintenance Tasks

Testing the Hub Only

Clearing a Password for the ASCII Console

Running Connectivity Tests

Obtaining Firmware Enhancements

Setting up the ASCII Console

Directly, Using A Serial Cable and a Terminal

Remotely, Using Telnet

Remotely, Using a Modem and a Terminal

Starting the Console

Console Command Reference

Syntax Conventions on Help Screen:

When to Use IPconfig

Configuring for Network Management

Using Novell NetWare IPX

Using IP

Security Configuration Parameter Definitions

Configuring Security on a Single Port

Configuring Security on All Twisted-Pair Ports

Showing the Security Configuration

Clearing Security Violation Indicators

Recommended Cables

Twisted-Pair Cable/Connector Pin-Outs

Minimum Cable Pinout for ASCII Console Connection

RS-232 Modem Cable

Twisted-Pair Cable Pin Assignments

Twisted-Pair Straight-Through Cable

Physical

Electrical

Environmental

Connectors

Electromagnetic

US Robotics Courier V.FC/V.34

Megahertz XJ2288 PCMCIA card modem

Practical Peripherals PM288MT II V.34

Intel 14.4EX

Supra FAX 288

IPX Addressing f or N ovell NetWare

IPX Addressing Notes:

IP Addresses for IP and Non-IP Networks

Globally Assigned IP Network Addresses

Device IP Configuration

Using BOOTP

The BOOTP Process

BOOTP Table File Entries

Definitions of the table entry fields:

Notes for the bootptab file:

How Backup Links Work

Limitations

Additional Notes

Examples of Backup Links

How the Backup Function Works

Configuring a Backup Link

Configuration/Installation Sequence

Identifying the Backup Link

Indications of Backup Link Activation

Reactivating the Primar y Link