Dell 28xx User Manual

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Dell™ PowerConnect™

28xx Systems

User Guide

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Notes, Notices, and Cautions

NOTE: A NOTE indicates important information that helps you make better use of your computer.

NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.

CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.

____________________

Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden. Trademarks used in this text: Dell, Dell OpenManage, the DELL logo, Inspiron, Dell Precision, Dimension, OptiPlex, PowerConnect,

PowerApp, PowerVault, Axim, DellNet, and Latitude are trademarks of Dell Inc. Microsoft and Windows are either trademarks or registered trademarks of Microsoft Corporation in the United States and/or other countries.

Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Inc. disclaims any proprietary interest in trademarks and trade names other than its own.

December 2008 Rev. A00

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

System Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

PowerConnect 2808 PowerConnect 2816

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

PowerConnect 2824. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

PowerConnect 2848 Summary of PowerConnect Models

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

. . . . . . . . . . . . . . . . . . . . 11

Features

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

General Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

MAC Address Supported Features . . . . . . . . . . . . . . . . . . . . . 13

Layer 2 Features VLAN Supported Features

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

. . . . . . . . . . . . . . . . . . . . . . . . . 14

Spanning Tree Protocol Features. . . . . . . . . . . . . . . . . . . . . . 15

Class of Service (CoS) Features Ethernet Switch Management Features

. . . . . . . . . . . . . . . . . . . . . . 16

. . . . . . . . . . . . . . . . . . 16

2 Hardware Description . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Switch Port Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

PowerConnect 28xx Front and Back Panel Port Description. . . . . . . . 17

Physical Dimensions

LED Definitions

Power LED Managed Mode LED Fan LED (2824/2848 only)

Port LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Managed Mode Button Switch Ventilation Fan

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

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

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

. . . . . . . . . . . . . . . . . . . . . . . . . . 22

. . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Cables, Port Connections, and Pinout Information

. . . . . . . . . . . . . . . 24

1000BASE-T Cable Requirements . . . . . . . . . . . . . . . . . . . . . 24

RJ-45 Connections for 10/100/1000BASE-T Ports . . . . . . . . . . . . . 24

SFP Ports

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Contents 3

Power Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Internal Power Supply Connector

. . . . . . . . . . . . . . . . . . . . . 26

3 Installing the PowerConnect Device . . . . . . . . . . . . . . . . 27

Installation Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Site Requirements

Unpacking

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Package Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Unpacking the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Mounting the Device

Overview Device Rack Installation Installing on a Flat Surface

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

. . . . . . . . . . . . . . . . . . . . . . . . . . 29

. . . . . . . . . . . . . . . . . . . . . . . . . 30

Installing on a Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Connecting the Device

Connecting the Device to the Network

Connecting the Terminal to the Device

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

. . . . . . . . . . . . . . . . . . . . . 32

. . . . . . . . . . . . . . . . . . . . . 33

Connecting a Device to a Power Supply . . . . . . . . . . . . . . . . . . 34

Port Connections, Cables, and Pinout Information

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

RJ-45 Connections for 10/100/1000BaseT Ports . . . . . . . . . . . . . . 35

Port Default Settings

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Auto-Negotiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

MDI/MDIX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Flow Control Back Pressure

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Switching Port Default Settings . . . . . . . . . . . . . . . . . . . . . . 37

4 Starting and Configuring the Device . . . . . . . . . . . . . . . . 39

4 Contents

Booting the Device - Managed Mode . . . . . . . . . . . . . . . . . . . . . . 40

Initial Configuration - Managed Mode

Advanced Configuration

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Retrieving an IP Address From a DHCP Server

. . . . . . . . . . . . . . . . . . . . . 41

. . . . . . . . . . . . . . . . . 45

Startup Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Startup Menu Procedures Software Download Erase FLASH File

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

. . . . . . . . . . . . . . . . . . . . . . . . . 45

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Erasing the Device Configuration. . . . . . . . . . . . . . . . . . . . . . 47

Password Recovery Software Download Through TFTP Server

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

. . . . . . . . . . . . . . . . . 47

Management Modes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Default Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Transitioning Between Modes . . . . . . . . . . . . . . . . . . . . . . . 50

Returning to Managed Mode

. . . . . . . . . . . . . . . . . . . . . . . . 51

5 Using Dell OpenManage Switch Administrator . . . . . . . . . 53

Understanding the Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Device Representation

Using the Switch Administrator Buttons

Information Buttons Device Management Buttons

Starting the Application

. . . . . . . . . . . . . . . . . . . . . . . . . . . 54

. . . . . . . . . . . . . . . . . . . . 55

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

. . . . . . . . . . . . . . . . . . . . . . . . 56

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Access Levels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

6 Configuring System Information . . . . . . . . . . . . . . . . . . . 59

Defining General Device Information . . . . . . . . . . . . . . . . . . . . . . 59

Viewing Device Information . . . . . . . . . . . . . . . . . . . . . . . . 59

Viewing the Versions Page . . . . . . . . . . . . . . . . . . . . . . . . . 61

Resetting the Device Entering Secure Mode

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

. . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Defining Device IP Addresses

. . . . . . . . . . . . . . . . . . . . . . . . . . 64

Defining IP Interface Parameters . . . . . . . . . . . . . . . . . . . . . 64

Running Cable Diagnostics

. . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Viewing Copper Cable Diagnostics . . . . . . . . . . . . . . . . . . . . . 65

Viewing Optical Transceiver Diagnostics . . . . . . . . . . . . . . . . . 67

Managing Device Security

. . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Defining the Local User Databases. . . . . . . . . . . . . . . . . . . . . 69

Contents 5

Configuring RADIUS Global Parameters . . . . . . . . . . . . . . . . . . 71

Defining SNMP Parameters

Defining SNMP Global Parameters Defining Communities

. . . . . . . . . . . . . . . . . . . . . . . . . . . 74

. . . . . . . . . . . . . . . . . . . . . 75

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Defining SNMP Notification Recipients . . . . . . . . . . . . . . . . . . 78

Managing Files

Downloading Files Uploading Files Restoring Default Settings

Defining DHCP Server Settings

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

. . . . . . . . . . . . . . . . . . . . . . . . . 83

Configuring DHCP Properties . . . . . . . . . . . . . . . . . . . . . . . . 84

Defining Network Pool . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Excluding Addresses Manually Allocating IP Addresses (Static Hosts)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

. . . . . . . . . . . . . 89

Configuring Address Binding . . . . . . . . . . . . . . . . . . . . . . . . 92

Defining Advanced Settings

Configuring General Device Parameters

. . . . . . . . . . . . . . . . . . . . . . . . . . . 93

. . . . . . . . . . . . . . . . . . 93

7 Configuring Device Switching. . . . . . . . . . . . . . . . . . . . . 95

Configuring Network Security. . . . . . . . . . . . . . . . . . . . . . . . . . 95

Configuring Port Based Authentication Configuring Advanced Port Based Authentication Authenticating Users

. . . . . . . . . . . . . . . . . . . . . . . . . . . 102

. . . . . . . . . . . . . . . . . . 96

. . . . . . . . . . . . 100

6 Contents

Configuring Ports

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Defining Port Parameters . . . . . . . . . . . . . . . . . . . . . . . . 103

Aggregating Ports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Configuring Green Ethernet Enabling Storm Control

. . . . . . . . . . . . . . . . . . . . . . . . 108

. . . . . . . . . . . . . . . . . . . . . . . . . . 110

Defining Port Mirroring Sessions. . . . . . . . . . . . . . . . . . . . . 112

Configuring Address Tables

Viewing Dynamic Addresses

Configuring the Spanning Tree Protocol

Defining STP Global Settings Defining STP Port Settings Defining STP LAG Settings

. . . . . . . . . . . . . . . . . . . . . . . . . . 114

. . . . . . . . . . . . . . . . . . . . . . . 114

. . . . . . . . . . . . . . . . . . . 116

. . . . . . . . . . . . . . . . . . . . . . . 116

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

. . . . . . . . . . . . . . . . . . . . . . . . 122

Configuring Rapid Spanning Tree. . . . . . . . . . . . . . . . . . . . . 124

Configuring VLANs

Defining VLAN Members VLAN Port Membership Table

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

. . . . . . . . . . . . . . . . . . . . . . . . . 126

. . . . . . . . . . . . . . . . . . . . . . 128

Defining VLAN Ports Settings. . . . . . . . . . . . . . . . . . . . . . . 130

Defining VLAN LAG Settings

Aggregating Ports

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Defining LAG Membership

Multicast Forwarding Support

Defining Multicast Global Parameters Adding Bridge Multicast Address Members

. . . . . . . . . . . . . . . . . . . . . . . 131

. . . . . . . . . . . . . . . . . . . . . . . . 134

. . . . . . . . . . . . . . . . . . . . . . . . . 134

. . . . . . . . . . . . . . . . . . 135

. . . . . . . . . . . . . . . 136

Assigning Multicast Forward All Parameters . . . . . . . . . . . . . . 138

IGMP Snooping

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

8 Viewing Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Viewing RMON Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Viewing RMON Statistics Group

Viewing Charts

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Viewing the CPU Utilization

. . . . . . . . . . . . . . . . . . . . . 144

. . . . . . . . . . . . . . . . . . . . . . . . 146

9 Configuring Quality of Service. . . . . . . . . . . . . . . . . . . . 147

Defining CoS Global Parameters . . . . . . . . . . . . . . . . . . . . . . . 149

Defining QoS Interface Settings

Defining Queue Settings

Mapping CoS Values to Queues

Mapping DSCP Values to Queues

. . . . . . . . . . . . . . . . . . . . . . . . 150

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

. . . . . . . . . . . . . . . . . . . . . . . . 153

. . . . . . . . . . . . . . . . . . . . . . . 154

A Managing the Device Using the CLI. . . . . . . . . . . . . . . . 157

Accessing the Device Through the CLI . . . . . . . . . . . . . . . . . . . . 157

Console Connection Telnet Connection

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Contents 7

Using the CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

Command Mode Overview User EXEC Mode

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

Privileged EXEC Mode

. . . . . . . . . . . . . . . . . . . . . . . . 158

. . . . . . . . . . . . . . . . . . . . . . . . . . 159

Global Configuration Mode . . . . . . . . . . . . . . . . . . . . . . . . 159

Interface Configuration Mode

. . . . . . . . . . . . . . . . . . . . . . 160

CLI Commands

Command: asset-tag Command: copy

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

. . . . . . . . . . . . . . . . . . . . . . . . . . . 161

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Command: debug-mode . . . . . . . . . . . . . . . . . . . . . . . . . 162

Command: do Command: end

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Command: exit (configuration) . . . . . . . . . . . . . . . . . . . . . . 163

Command: exit (EXEC) Command: help

. . . . . . . . . . . . . . . . . . . . . . . . . . 164

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Command: interface ethernet. . . . . . . . . . . . . . . . . . . . . . . 165

Command: interface port-channel Command: interface vlan

. . . . . . . . . . . . . . . . . . . . 165

. . . . . . . . . . . . . . . . . . . . . . . . . 166

Command: ip address . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

Command: ip default-gateway Command: login

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

. . . . . . . . . . . . . . . . . . . . . . 167

Command: ping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Commad: reload Command: show tech-support command

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

. . . . . . . . . . . . . . . . 169

Command: snmp-server community . . . . . . . . . . . . . . . . . . . 171

Command: username

. . . . . . . . . . . . . . . . . . . . . . . . . . . 172

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

8 Contents

Introduction

This User’s Guide contains the information needed for installing, configuring and maintaining the PowerConnect 2808, PowerConnect 2816, PowerConnect 2824, and PowerConnect 2848 Webmanaged Gigabit Ethernet switches.

The PowerConnect 28xx switches can be used to connect workstations and other network devices, such as:

•Servers

•Hubs

•Routers

The PowerConnect devices are primarily designated for the Small Office/Home Office (SOHO) that require high performance edge connectivity. These PowerConnect devices are ideal for the small to medium business that requires high performance network connectivity along with advanced web management features. The PowerConnect management features are designed to minimize administrative management effort, while enhancing and improving network traffic control.

System Description

This section describes the hardware configurations of the PowerConnect 28xx. The switches are managed by Dell’s OpenManage Switch Administrator.

PowerConnect 2808

The following figure illustrates the PowerConnect 2808 front panel.

Figure 1-1. PowerConnect 2808 Front Panel

The PowerConnect 2808 supports the following ports:

• 8 Gigabit Ethernet copper ports

PowerConnect 2816

The following figure illustrates the PowerConnect 2816 front panel.

Dell PowerConnect 28xx Systems User Guide 9

Figure 1-2. PowerConnect 2816 Front Panel

The PowerConnect 2816 supports the following ports:

• 16 Gigabit Ethernet copper ports

PowerConnect 2824

The following figure illustrates the PowerConnect 2824 front panel.

Figure 1-3. PowerConnect 2824 Front Panel

The PowerConnect 2824 supports the following ports:

• 24 Gigabit Ethernet copper ports

• 2 SFP combo ports (1000BASE-SX or 1000BASE-LX)

PowerConnect 2848

The following figure illustrates the PowerConnect 2848 front panel.

Figure 1-4. PowerConnect 2848 Front Panel

The PowerConnect 2848 supports the following ports:

• 48 Gigabit Ethernet copper ports

• 4 SFP combo ports (1000BASE-SX or 1000BASE-LX)

10 Dell PowerConnect 28xx Systems User Guide

Summary of PowerConnect Models

The following table summarizes the PowerConnect models.

Table 1-1. PowerConnect Models

Model Copper Ports/

RJ-45 Connectors

PowerConnect 2808 8 built-in 10/100/1000 Base-T ports none Internal console port none

PowerConnect 2816 16 built-in 10/100/1000 Base-T ports none External console port none

PowerConnect 2824 24 built-in 10/100/1000 Base-T ports 2 SFP (combo) External console port 1

PowerConnect 2848 48 built-in 10/100/1000 Base-T ports 4 SFP (combo) External console port 2

Optical Ports/ GbE

RS232 serial port baud rate is 9600 bps

Fans

Features

General Features

Management Modes

The device supports the following modes:

•

Managed Mode

•

Unmanaged Mode

configuration cannot be changed.

•

Secure Mode

configuration changes by removing the IP address of the device so that it becomes inaccessible for configuration.

For more information about the management modes, see "Management Modes" on page 49.

— Provides switch management through the web interface.

— In this mode, the device operates as a hub with default configuration, and

— This mode keeps the existing configuration active, but it prevents users from making

Head of Line Blocking Prevention

Head of Line (HOL) blocking results in traffic delays and frame loss caused by traffic competing for the same egress port resources. HOL blocking queues packets, and the packets at the head of the queue are forwarded before packets at the end of the queue. By default, the device is configured so that the HOL blocking prevention mechanism is active at all times, except when QoS (Quality of Service), Flow Control or Back Pressure is active on a port where the HOL blocking prevention mechanism is disabled on the whole system.

Back Pressure Support

On half-duplex links, the receiving port prevents buffer overflows by occupying the link so that it is unavailable for additional incoming traffic. The user may enable or disable this feature on a per-port basis. The default status on all ports is set to OFF.

Dell PowerConnect 28xx Systems User Guide 11

Auto Negotiation

Auto negotiation allows an Ethernet switch to advertise modes of operation. The auto negotiation function provides the means to exchange information between two Ethernet switches that share a pointto-point link segment, and to automatically configure both Ethernet switches to take maximum advantage of their transmission capabilities. Port advertisement allows the system administrator to configure the port speeds advertised.

Jumbo Frames Support

Jumbo frames are frames with an MTU (Maximum Transmission Unit) size of up to 10K bytes. The Jumbo Frames Support feature, utilizes the network optimally by transporting the same data using less frames.

The main benefits of this facility are reduced transmission overhead and reduced host processing overhead. Jumbo frames are used for server-to-server transfers.

AutoMDI/MDIX Support

The switch automatically detects whether the cable connected to an RJ-45 port is crossed or straight through.

Standard wiring for end stations is Media-Dependent Interface (MDI) and the

tandard wiring for hubs

and switches is known as Media-Dependent Interface with Crossover (MDIX).

Auto MDI/MDIX works on 10/100/1000BASE-T Ethernet ports. This feature is automatically enabled for the entire system and cannot be turned off by the user.

Flow Control Support (IEEE802.3X)

On Full Duplex links (FDX), the flow control mechanism allows the receiving side to signal to the sending side that transmission must be halted temporarily, in order to prevent buffer overflows. Flow control is enabled by default.

Virtual Cable Testing (VCT)

VCT technology provides the mechanism to detect and report potential cabling issues, such as cable opens and cable shorts on copper links.

Cable analysis is available on Copper Cables (10BASE-T/100BASE-T/1000BASE-T), and is only done when the link is down. When the system initiates a cable-testing operation, upon explicit user action, the following parameters are detected:

• Cable Type and Status

•Cable Length

• Fault-Distance

12 Dell PowerConnect 28xx Systems User Guide

MAC Address Supported Features

MAC Address Capacity Support

The PowerConnect 2808, 2816, 2824 switches support a total of 8K MAC addresses, and the

PowerConnect 2848 supports a total of 16K MAC addresses.

Auto-Learning MAC Addresses

The switch enables MAC address auto-learning from incoming packets. The MAC addresses are stored in the Bridging Table.

Automatic Aging for MAC Addresses

MAC addresses from which no traffic is received for a given period of time are aged out. This prevents the Bridging Table from overflowing.

VLAN-aware MAC-based Switching in Managed and Secure Modes

In Managed or Secure mode, the switch system always performs VLAN-aware bridging. Classic bridging

(IEEE802.1D) is not performed (where frames are forwarded based only on their destination MAC address). However, a similar functionality may be configured for untagged frames. Addresses are associated with ports by learning them from the incoming frames source address.

802.1D Bridging in Unmanaged Mode

In Unmanaged Mode, the switch performs classic bridging. Frames are forwarded based on their destination MAC address only, regardless of the VLAN tag.

MAC Multicast Support

Multicast service is a limited broadcast service, which allows one-to-many and many-to-many connections for information distribution. Layer 2 Multicast service is where a single frame is addressed to a specific Multicast address, from where copies of the frame are transmitted to the relevant ports. IGMP Snooping is supported, including IGMP Querier which simulates the behavior of a multicast router, allowing snooping of the layer 2 multicast domain even though there is no multicast router. When Multicast groups are statically enabled, you can set the destination port of registered groups, as well as define the behavior of unregistered multicast frames.

Layer 2 Features

Green Ethernet

Green Ethernet, also known as Energy Efficient Ethernet, is an effort to make networking equipment environmentally friendly, specifically by reducing power usage of Ethernet connections. The following methods are supported by the device:

•

Energy-Detect

— Auto-detection of inactivity on a port, and subsequent reducing of transmit power.

Dell PowerConnect 28xx Systems User Guide 13

•

Short-Reach

IGMP Snooping

— Reduction of power over Ethernet cables shorter than 40m.

Internet Group Membership Protocol (IGMP) Snooping examines IGMP frame contents, when they are forwarded by the device from work stations to an upstream Multicast router. From the frame, the device identifies work stations configured for Multicast sessions, and which Multicast routers are sending Multicast frames.

Port Mirroring

The port mirroring mechanism monitors and mirrors network traffic by forwarding copies of incoming and outgoing packets from a monitored port to a monitoring port. Users can specify which target port receives copies of all traffic passing through one or more source ports.

Storm Control

Storm Control enables limiting the amount of Multicast, Broadcast and Unknown Unicast frames accepted and forwarded by the switch. When Layer 2 frames are forwarded, Broadcast and Multicast frames are flooded to all ports on the relevant VLAN. All nodes connected to these ports accept and attempt to process these frames, thus placing load on both the network links and the host operating system.

Dynamic VLAN Assignment (DVA)

Dynamic VLAN Assignment allows automatic assignment of users to VLANs during the RADIUS server authentication. When a user is authenticated by the RADIUS server, the user is automatically joined to the VLAN configured on the RADIUS server.

VLAN Supported Features

VLAN Support

VLANs are collections of switching ports that comprise a single broadcast domain. Packets are classified as belonging to a VLAN based on either the VLAN tag or based on a combination of the ingress port and package contents. Packets sharing common attributes can be grouped in the same VLAN.

Port Based Virtual LANs (VLANs)

Port-based VLANs classify incoming packets to VLANs based on their ingress port.

Link Aggregation

The PowerConnect 28xx switches support up to six aggregated links. Each of the six aggregated links may be defined with up to four member ports to form a single Link Aggregated Group (LAG).

The benefits of this facility are:

• Fault tolerance protection from physical link disruption

14 Dell PowerConnect 28xx Systems User Guide

• Higher bandwidth connections

• Improved bandwidth granularity

• High bandwidth server connectivity

A LAG is composed of ports with the same speed set to full-duplex operation.

DHCP Server

Dynamic Host Configuration Protocol is a method of managing network parameter assignment from a single DHCP server. The Dynamic Host Configuration Protocol (DHCP) automates the assignment of IP addresses, subnet masks, default gateway, and other IP parameters.

BootP and DHCP Clients

DHCP (Dynamic Host Configuration Protocol) enables additional setup parameters to be received from a network server upon system startup. DHCP service is an on-going process. DHCP is an extension to BootP.

The BootP client is operational if there is a corrupted or invalid software image. The BootP client then continuously attempts to find a BootP server, by sending BootP requests to all ports on the default VLAN, until a BootP server replies. The information replied is then used to provide the switch system with a TFTP server IP address and a download file name. The switch can then configure these values to the TFTP client and try to download a valid runtime image.

Spanning Tree Protocol Features

Spanning Tree Protocol (STP)

802.1d Spanning tree is a standard Layer 2 switch requirement that allows bridges to automatically prevent and resolve L2 forwarding loops. Switches exchange configuration messages using specifically formatted frames and selectively enable and disable forwarding on ports.

Fast Link

STP can take up to 30-60 seconds to converge. During this time, STP detects possible loops, allowing time for status changes to propagate and for relevant devices to respond. 30-60 seconds is considered too long of a response time for many applications. The Fast Link option bypasses this delay, and can be used in network topologies where forwarding loops do not occur.

IEEE 802.1w Rapid Spanning Tree

Spanning Tree can take 30-60 seconds for each host to decide whether its ports are actively forwarding traffic. Rapid Spanning Tree (RSTP) detects uses of network topologies to enable faster convergence, without creating forwarding loops.

STP Root Guard

Root guard restricts the interface from functioning as the root port for the switch

Dell PowerConnect 28xx Systems User Guide 15

Class of Service (CoS) Features

The PowerConnect 28xx system enables users to define various services for traffic classes of service. The underlying mechanism for supporting bandwidth management and control is based on the use of multiple priority queues for classifying traffic. The switches support four queues per port.

A CoS is defined by the user, whereby packets are related to the same Class of Service. After a packet has been classified, it is assigned to one of the queues. The PowerConnect 28xx system can classify according to IPv4 information (DSCP).

Class of Service 802.1p Support

The IEEE 802.1p signaling technique is an OSI Layer 2 standard for marking and prioritizing network traffic at the data link/MAC sub-layer. 802.1p traffic is classified and sent to the destination. No bandwidth reservations or limits are established or enforced. 802.1p is a spin-off of the 802.1Q (VLANs) standard.

Ethernet Switch Management Features

Web-Based Management

With a Web-based management interface, the Ethernet Switches’ system can be managed from any Web browser. The system contains an Embedded Web Server (EWS), which serves HTML pages, through which the system can be monitored and configured.

TFTP Trivial File Transfer Protocol

The PowerConnect 28xx switches support software boot image and software download through TFTP.

Remote Monitoring

Remote Monitoring (RMON) is an extension to the Simple Network Management Protocol (SNMP), which provides network traffic statistics. RMON defines current and historical MAC-layer statistics and control objects, allowing real-time information to be captured across the entire network. The switches support one RMON group for Ethernet statistics. The system provides a means to collect the statistics defined in RMON and to view the results, using the Web management interface in the system.

16 Dell PowerConnect 28xx Systems User Guide

Hardware Description

Switch Port Configurations

PowerConnect 28xx Front and Back Panel Port Description

The Dell™ PowerConnect™ 28xx switches use 10/100/1000BASE-T ports on the front panel for connecting to a network.

The Gigabit Ethernet ports can operate at 10, 100 or 1000 Mbps. These ports support autonegotiation, duplex mode (Half or Full duplex), and flow control. The combo 1000 Mbps optical ports can only operate at 1000 Mbps, full-duplex mode.

The following figures illustrate the front panels and back panels of the PowerConnect 28xx switches.

Figure 2-1. PowerConnect 2808 Front Panel

On the front panel there are eight ports which are numbered 1 to 8, top down and left to right. On each port there are LEDs (Light Emitting Diode) to indicate the port status.

On the left side of the front panel is the Managed Mode LED which indicates the Ethernet switch operational status and the management mode. The Power LED on the front panel indicates whether the device is powered on or not. A Mode push-button, located on the right side on the front panel is used to transition between management modes and to reset the device. For more information about management modes and transitioning between them, see "Management Modes" on page 49.

Dell PowerConnect 28xx Systems User Guide 17

Figure 2-2. PowerConnect 2808 Back Panel

Figure 2-3. PowerConnect 2816 Front Panel

On the front panel there are 16 ports which are numbered 1 to 16, top down and left to right. On each port there are LEDs to indicate the port status.

On the left side of the front panel is the Managed Mode LED which indicates the Ethernet switch operational status and the management mode. The Power LED on the front panel indicates whether the device is powered on or not. A Mode push-button, located on the right side on the front panel, is used to transition between management modes and to reset the device. For more information about management modes and transitioning between them, see "Management Modes" on page 49.

Figure 2-4. PowerConnect 2816 Back Panel

18 Dell PowerConnect 28xx Systems User Guide

Figure 2-5. PowerConnect 2824 Front Panel

On the front panel there are 24 ports which are numbered 1 to 24, top down and left to right. On each port there are LEDs to indicate the port status. There are two SFP (Small Form-Factor Plugable) ports, designated as ports 23 and 24, for fiber connection. The two combo ports are logical ports with two physical connections:

• An RJ-45 connection for Twisted Pair (TP) copper cabling

• An SFP port for swappable optical transceiver, which offers high-speed 1000BASE-SX or 1000BASELX connection.

NOTE: Only one of the two physical connections of a combo port can be used at any one time. Port features and

port controls are determined by the physical connection used. The system automatically detects the media used on a combo port, and utilizes the information in all the control interfaces.

NOTE: The system can switch from the RJ-45 to the SFP (or vice versa) without resetting the device. If both RJ-45

and SFP ports are present, the SFP port will be the active port, whereas the RJ-45 port will be disabled.

On the front panel is the Managed Mode LED which indicates the Ethernet switch operational status and the management mode. The Fan LED indicates the device fan operations status, and the Power LED on the front panel indicates whether the device is powered on or not. A Mode push-button, located on the right side on the front panel is used to transition between management modes and to reset the device. For more information about management modes and transitioning between them, see "Management Modes" on page 49.

Dell PowerConnect 28xx Systems User Guide 19

Figure 2-6. PowerConnect 2824 Back Panel

Figure 2-7. PowerConnect 2848 Front Panel

On the front panel there are 48 ports, which are numbered 1 to 48, top down and left to right. On each port, there are LEDs to indicate the port status. There are four SFP (Small Form-Factor Plugable) ports, designated as ports 45, 46, 47 and 48, for fiber connection. The four combo ports are logical ports with two physical connections:

• An RJ-45 connection for Twisted Pair (TP) copper cabling.

• An SFP port for swappable optical transceiver, which offers high-speed 1000BASE-SX or 1000BASE-LX connection.

NOTE: Only one of the two physical connections of a combo port can be used at any one time. Port features and

port controls are determined by the physical connection used. The system automatically detects the media used on a combo port, and utilizes the information in all the control interfaces.

NOTE: The system can switch from the RJ-45 to the SFP (or vice versa) without resetting the device. If both RJ-45

and SFP ports are present, the SFP port will be the active port, whereas the RJ-45 port will be disabled.

On the top right side of the front panel is the Managed Mode LED which indicates the Ethernet switch operational status and the management mode. The Fan LED indicates the device fan operations status, and the Power LED on the front panel indicates whether the device is powered on or not. A Mode push-

20 Dell PowerConnect 28xx Systems User Guide

button, located on the right side on the front panel is used to transition between management modes and to reset the device. For more information about management modes and transitioning between them, see "Management Modes" on page 49.

Fans are provided on the side panel. The back panel contains an AC Power Supply Interface.

The following figure illustrates the back panel of the PowerConnect 2848 device.

Figure 2-8. PowerConnect 2848 Back Panel

Physical Dimensions

The PowerConnect 2808 switch has the following physical dimensions:

• Height — 43.2 mm (1.7008 in.)

• Width — 256 mm (10.079 in.)

• Depth — 161.7 mm (6.366 in.)

The PowerConnect 2816 and PowerConnect 2824 switches have the following physical dimensions:

• Height — 43.2 mm (1.7008 in.)

• Width — 330 mm (12.992 in.)

• Depth — 230.50 mm (9.075 in.)

The PowerConnect 2848 switch has the following physical dimensions:

• Height — 43.2 mm (1.70 in.)

• Width — 440 mm (17.32 in)

• Depth — 255 mm (10.04 in.)

LED Definitions

The front panel contains LEDs that indicate the status of links, power supply, fan status, and Managed Mode status.

Dell PowerConnect 28xx Systems User Guide 21

Power LED

On the PowerConnect 28xx front panel there is a Power LED. The following table describes the Power Supply status LED indications.

Table 2-1. Power LED Indications

LED Color Description

Green Solid The switch is turned on.

Off The switch is not turned on.

Managed Mode LED

On the PowerConnect 28xx front panel there is a Managed Mode LED monitoring the switch node as well as indicating diagnostic test results. The following table describes the Managed Mode LED indications. For more information about management modes and transitioning between them, see "Management Modes" on page 49.

Table 2-2. Managed Mode LED Indications

LED Color Description

Green Flashing Indicates diagnostics in progress, firmware loading, or Management Mode transition.

Green Solid Indicates the switch is in Managed Mode.

Amber Solid Diagnostics has failed.

Amber Flashing No valid image.

Off Indicates Unmanaged mode or Secure mode.

Fan LED (2824/2848 only)

On the PowerConnect 2824 and PowerConnect 2848 front panel there is a fan LED. The following table describes the fan status LED indications.

Table 2-3. Fan LED Indications

LED Color Description

Green Solid All fans are operating correctly.

Red Solid One or more fans have failed.

Port LEDs

10/100/1000BASE-T Port LEDs

Each 10/100/1000BASE-T port has two LEDs. Speed/Link/Activity is indicated on the left LED and the duplex mode is indicated on the right LED.

The following figure illustrates the RJ-45 10/100/1000BASE-T LEDs.

22 Dell PowerConnect 28xx Systems User Guide

Figure 2-9. RJ-45 Copper-based 10/100/1000BASE-T LEDs

The RJ-45 LED indications are described in the following table:

Table 2-4. RJ-45 Copper based 10/100/ 1000BASE-T LED Indications

LED Color Description

Left LED Green Solid The port is linked at 1000 Mbps.

Green Flashing The port is transmitting or receiving data at 1000 Mbps.

Amber Solid The port is linked at either 10 or 100 Mbps.

Amber Flashing The port is transmitting or receiving data at 10 or 100 Mbps.

Off No link is established.

Right LED Green Solid The port is currently transmitting in Full Duplex mode.

Off The port is operating in Half Duplex mode.

SFP Port LED

The following table describes the SFP LED indications.

Table 2-5. SFP LED Indications

LED Color Description

Green Solid Link is established.

Green Flashing Activity is occurring.

Off No link is established.

Managed Mode Button

The PowerConnect 28xx has a Mode push button on the front panel. The Mode button is for changing between Managed Mode and Unmanaged (or Secure) Mode and for resetting the device. To transition between modes, press the button normally. To reset the device, press and hold the button for at least 7 seconds. For more information about management modes and transitioning between them, see "Management Modes" on page 49.

Switch Ventilation Fan

The PowerConnect 2848 switch has three fans and the PowerConnect 2824 switch has one fan for system ventilation. The PowerConnect 2808 and PowerConnect 2816 devices have no internal fans.

Dell PowerConnect 28xx Systems User Guide 23

Cables, Port Connections, and Pinout Information

This section explains the switch physical interfaces, and provides information about cables and port connections. Copper cable diagnostics are supported. High-speed workstations, hubs, routers, or other switches are connected through standard RJ-45 connectors to the switch physical interface ports, located on the front panel. For each device, the supported mode is set to Half Duplex, Full Duplex, and Auto.

1000BASE-T Cable Requirements

All Category 5 UTP cables that are used for 100BASE-TX connections also operate with 1000BASE-T, provided if all four wire pairs are connected. However, it is recommended that enhanced Category 5 (Category 5e)cable is used for all critical connections or any new cable installations. The Category 5e specification includes test parameters that are only recommendations for Category 5, and comply with the IEEE 802.3ab standards.

RJ-45 Connections for 10/100/1000BASE-T Ports

The 10/100/1000BASE-T ports are copper Twisted-Pair ports.

Table 2-6. Port Default Settings

Connector Port/Interface Cable

RJ-45 10/100/1000BASE-T Port Cat.5

The following figure illustrates the RJ-45 pin connector pin numbers.

Figure 2-10. RJ-45 Pin Numbers

The RJ-45 pin number allocation for the 10/100/1000BASE-T ports is listed in the following table.

Table 2-7. RJ-45 Pin Number Allocation for 10/100/ 1000BASE-T Ethernet Port

Pin No Function

1 TxRx 1+

2 TxRx 1-

3 TxRx 2+

4 TxRx 2-

5 TxRx 3+

24 Dell PowerConnect 28xx Systems User Guide

Table 2-7. RJ-45 Pin Number Allocation for 10/100/ 1000BASE-T Ethernet Port

Pin No Function

6 TxRx 3-

7 TxRx 4+

8 TxRx 4-

SFP Ports

The PowerConnect 2824 switch supports two SFP transceivers combo ports, and the PowerConnect 2848 switch supports four SFP transceivers combo ports for various fiber-based modules (1000BASE-SX or 1000BASE-LX). Only one of the two physical connections of a combo port can be used at any time. The system can switch from the RJ-45 to the SFP (or vice versa) without a system reset. The system automatically detects the media used on a combo port, and utilizes this information in the control interfaces.

PowerConnect 2824 switch supports SFP diagnostics. The optical transceiver provides access to a set of parameters that can be monitored and displayed to the system administrator.

NOTE: If both RJ-45 and SFP ports are present, the SFP port will be the active port, whereas the RJ-45 port will be

disabled and ignored.

The pin number allocation for the SFP ports is listed in the following table.

Table 2-8. SFP Pin Connections

Pin No Use

1 Transmitter ground (common with receiver ground)

2 Transmitter fault

3 Transmitter disable; laser output disabled on high or open.

4 Module definition 2; data line for serial ID.

5 Module definition 1; clock line for serial ID.

6 Module definition 0; grounded within the module.

7 Rate select; no connection required.

8 Loss of signal indication; logic 0 indicates normal operation.

9 Receiver ground (common with transmitter ground)

10 Receiver ground (common with transmitter ground)

11 Receiver ground (common with transmitter ground)

12 Receiver inverted data out; AC coupled.

13 Receiver non-inverted data out; AC coupled.

14 Receiver ground (common with transmitter ground)

Dell PowerConnect 28xx Systems User Guide 25

Table 2-8. SFP Pin Connections

Pin No Use

15 Receiver power supply

16 Transmitter power supply

17 Transmitter ground (common with receiver ground)

18 Transmitter non-inverted data in

19 Transmitter inverted data in

20 Transmitter ground (common with receiver ground)

Power Connectors

The PowerConnect 28xx is powered by using the AC internal power supply.

Internal Power Supply Connector

The PowerConnect 28xx supports a single internal power supply to provide power for switching operations. The internal power supply supports input voltages between 100 and 240 VAC. The AC power connector is located on the back panel of the switch.

26 Dell PowerConnect 28xx Systems User Guide

Installing the PowerConnect Device

This section contains information about device unpacking, location, installation, and cable connections.

Installation Precautions

CAUTION Before performing any of the following procedures, read and follow the safety instructions located

in the

System Information Guide

CAUTION Observe the following points before performing the procedures in this section:

• Ensure that the rack or cabinet housing the device is adequately secured to prevent it from becoming unstable and/or falling over.

• Ensure that the power source circuits are properly grounded.

• Observe and follow the service markings. Do not service any device except as explained in the system documentation. Opening or removing covers marked with a triangular symbol with a lighting bolt may cause electrical shock. These components are to be serviced by trained service technicians only.

• Ensure that the power cable, extension cable, and/or plug is not damaged.

• Ensure that the device is not exposed to water.

• Ensure that the device is not exposed to radiators and/or heat sources.

• Ensure that the cooling vents are not blocked.

• Do not push foreign objects into the device, as it may cause a fire or electric shock.

• Use the device only with approved equipment.

• Allow the device to cool before removing covers or touching internal equipment.

• Ensure that the device does not overload the power circuits, wiring, and over-current protection. To determine the possibility of overloading the supply circuits, add together the ampere ratings of all switches installed on the same circuit as the device. Compare this total with the rating limit for the circuit.

• Do not install the device in an environment where the operating ambient temperature might exceed 45ºC (113ºF).

• Ensure that the airflow around the front, sides, and back of the device is not restricted.

included in the Dell Documentation.

Dell PowerConnect 28xx Systems User Guide 27

Site Requirements

The PowerConnect 28xx can be mounted in a standard equipment rack, placed on a tabletop, or mounted on the wall.

Before installing the device, verify that the site selected for the device meets the following site requirements:

•

Power

— The device is installed within 1.5 m (5 feet) of a grounded, easily accessible outlet 220/110 VAC, 50/60 Hz. If the device has two power supplies, the site should have two power outlets with different power feeders.

•

General

•

Clearance

power connections, and ventilation.

•

Cabling

amplifiers, power lines, and fluorescent lighting fixtures.

•

Ambient Requirements

113 °F) at a relative humidity of up to 95%, non-condensing. Verify that water or moisture cannot enter the device case.

— Ensure that the power supply is correctly installed.

— There is adequate frontal clearance for operator access. Allow clearance for cabling,

— Cabling is routed to avoid sources of electrical noise such as radio transmitters, broadcast

— The ambient device operating temperature range is 0 to 45 °C (32 to

Unpacking

Package Contents

While unpacking the device, ensure that the following items are included:

•The device

• AC power cable

• Self-adhesive rubber pads (for on-shelf installation)

• Rack-mount kit for installation

• Documentation CD

• Product Information Guide

Unpacking the Device

To unpack the PowerConnect device:

NOTE: Before unpacking the device, inspect the packaging and report any evidence of damage.

Place the box on a clean flat surface.

Open the box or remove the box top.

Carefully remove the device from the package and place it on a secure, stable and clean surface.

Remove all packing material.

28 Dell PowerConnect 28xx Systems User Guide

Inspect the product for damage. Report any damage immediately.

Mounting the Device

Overview

There are three device mounting options:

• Installing in a Rack

• Installing on a Flat Surface

• Installing on a Wall

Device Rack Installation

CAUTION Read the safety information in the Product Information Guide as well as the safety information for other

devices that connect to or support the switch.

CAUTION Disconnect all cables from the device before mounting the device in a rack or cabinet.

CAUTION When mounting multiple devices into a rack, mount the devices from the bottom up.

Install the device in a rack as follows:

Place the supplied rack-mounting bracket on one side of the device ensuring the mounting holes on the device line up to the mounting holes on the rack mounting bracket. The following figure illustrates where to mount the brackets.

Dell PowerConnect 28xx Systems User Guide 29

Figure 3-1. Bracket Installation for Rack Mounting

Insert the supplied screws into the rack mounting holes and tighten with a screwdriver.

Repeat the process for the rack-mounting bracket on the other side of the device.

Insert the device into the rack, ensuring the rack-mounting holes on the device line up to the mounting hole on the rack.

Secure the device to the rack with the rack screws (not provided). Fasten the lower pair of screws before the upper pair of screws. Ensure that the ventilation holes are not obstructed.

Installing on a Flat Surface

The device must be installed on a flat surface if it is not installed on a rack. The surface must be able to support the weight of the device and the device cables.

Attach the self-adhesive rubber pads (provided with the device) on each marked location on the bottom of the chassis.

Set the device on a flat surface, while leaving 2 inches (5.08 cm) on each side and 5 inches (12.7 cm) at the back.

Ensure that the device has proper ventilation.

30 Dell PowerConnect 28xx Systems User Guide

Installing on a Wall

To mount the device on a wall:

Ensure that the mounting location meets the following requirements:

• The surface of the wall must be capable of supporting the device.

• Allow at least 2 inches (5.1 cm) space on the sides for proper ventilation and 5 inches (12.7 cm) at

the back for power cable clearance.

• The location must not be exposed to direct sunlight.

• The location must be at least 2 feet (61 cm) away from any heating vents, and no area-heating

vent should point towards the device.

• The location must be ventilated to prevent heat buildup.

• Do not locate the device near any data or electrical cabling.

• The power cable must be able to reach an outlet.

Place the supplied wall-mounting bracket on one side of the device, ensuring that the mounting holes on the device line up to the mounting holes on the rack-mounting bracket. The following figure illustrates where to mount the brackets.

Figure 3-2. Bracket Installation for Wall Mounting

Insert the supplied screws into the rack-mounting holes and tighten with a screwdriver.

Repeat the process for the wall-mounting bracket on the other side of the device.

Place the device on the wall in the location where the device is being installed.

Dell PowerConnect 28xx Systems User Guide 31

On the wall mark the locations where the screws to hold the device must be prepared.

On the marked locations, drill the holes and place all plugs (not provided) in the holes.

Secure the device to the wall with screws (not provided). Ensure that the ventilation holes are not obstructed.

Figure 3-3. Mounting Device on a Wall

Connecting the Device

To configure the device, the device must be connected to a terminal.

Connecting the Device to the Network

To connect to an uplink port, use Category 5 Unshielded Twisted-Pair (UTP) cables with RJ-45 connectors at both ends. The RJ-45 ports on the Ethernet device support automatic Media-Dependent Interface/Media-Dependent Interface with internal crossover wiring (MDI/MDIX) operation under Auto-Negotiation mode. Standard straight-through twisted-pair cables can be used to connect to any other Ethernet network (systems, servers, switches or routers) that supports auto-negotiation.

32 Dell PowerConnect 28xx Systems User Guide

NOTE: Do not plug a phone jack connector into an RJ-45 port. This will damage the Ethernet device. Use only

twisted-pair cables with RJ-45 connectors that conform to FCC standards.

NOTE: If auto negotiation is turned off on the ports, a straight through cable must be used.

To connect the device to the network:

Attach one end of a Twisted-Pair cable to the device’s RJ-45 connector and the other end to a switch or server.

Make sure each twisted pair cable does not exceed 328 feet (100 meters) in length.

As each connection is made, the link LED corresponding to each port on the device is illuminated (green or amber) indicating that the connection is valid.

Connecting the Terminal to the Device

The device provides an external console port in models 28016/24/48. The console port enables a connection to a terminal desktop system running terminal emulation software for monitoring and configuring the device.

The Console port connector is a male DB-9 connector, implemented as a data terminal equipment (DTE) connector..

To use the Console port, the following is required:

• VT100 compatible terminal or a desktop or portable system with a serial port and running VT100 terminal emulation software.

• An RS-232 crossover cable with a female DB-9 connector for the Console port and the appropriate connector for the terminal.

To connect a terminal to the device Console port, perform the following:

Connect the supplied RS-232 crossover cable to the terminal running VT100 terminal emulation software.

Ensure that the terminal emulation software is set as follows:

Select the appropriate serial port (serial port 1 or serial port 2) to connect to the console.

Set the data rate to 9600 baud.

Set the data format to 8 data bits, 1 stop bit, and no parity.

Set flow control to none.

Under Properties, select VT100 for Emulation mode.

Select Terminal keys for Function, Arrow, and Ctrl keys. Ensure that the setting is for Terminal keys (not Windows keys).

NOTE: When using HyperTerminal with Microsoft® Windows 2000, Windows XP, or Windows Vista, ensure that

you have the latest service packs installed. With Windows 2000 Service Pack 2, the arrow keys function properly in HyperTerminal’s VT100 emulation. Go to Windows Vista service packs.

www.microsoft.com

for information on Windows 2000, Windows XP, and

Dell PowerConnect 28xx Systems User Guide 33

Connect the female connector of the RS-232 crossover cable directly to the device Console port on the device, and tighten the captive retaining screws. The Console port is located on the back panel.

Connecting to Console Port

Connecting a Device to a Power Supply

Connect the supplied standard AC power cable to the AC connector on the back panel.

Do not connect the power cable to a grounded AC outlet at this time. Connect the device to a power source in the steps detailed in Starting and Configuring the Device.

Figure 3-4. Connecting to Power Supply

After connecting the device to a power source, confirm that the device is connected and operating correctly by examining the LEDs on the front panel.

34 Dell PowerConnect 28xx Systems User Guide

Port Connections, Cables, and Pinout Information

This section explains the device’s physical interfaces, and provides information about port connections. Connector types, ports and cables are summarized in Ports, Connectors, and Cables. Copper Cable and Optical Transceiver Diagnostics are supported.

RJ-45 Connections for 10/100/1000BaseT Ports

The 10/100/1000BaseT ports are copper twisted-pair ports.

To establish a link for the twisted-pair ports, Tx pair on one cable end must be connected to the Rx pair on the other cable end, and vice versa. If the cabling is done such that Tx on one end is wired to Tx on the other end, and Rx is wired to Rx, a link is not established.

When selecting cables to connect the device ports to their networking peers, straight through cables must be used to connect the device to a station, and crossover cables must be used to connect one transmission device (switch or hub) to another. Both the straight through and crossover cables are category 5.

After a port is connected, its LINK indication LED is lit.

Table 3-1. Ports, Connectors and Cables

Connector Port/Interface Cable

RJ-45 10/100/1000BaseT Port Cat.5

The RJ-45pin number allocation for the 10/100/1000BaseT ports is listed in the table following.

Table 3-2. RJ-45 Pin Number Allocation for 10/100/1000BaseT Ethernet Port

Pin No Functi on

1 TxRx 1+

2 TxRx 1-

3 TxRx 2+

4 TxRx 2-

5 TxRx 3+

6 TxRx 3-

7 TxRx 4+

8 TxRx 4-

Dell PowerConnect 28xx Systems User Guide 35

Port Default Settings

The general information for configuring the device ports includes the short description of the autonegotiation mechanism and the default settings for switching ports.

Auto-Negotiation

Auto-negotiation enables automatic detection of speed, duplex mode and flow control on switching 10/100/1000BaseT ports. Auto-negotiation is enabled per port by default.

Auto-negotiation is a mechanism established between two link partners to enable a port to advertise its transmission rate, duplex mode and flow control (the flow control by default is enabled) abilities to its partner. The ports then both operate at the highest common denominator between them.

If connecting a NIC that does not support auto-negotiation or is not set to auto-negotiation, both the device switching port and the NIC must be manually set to the same speed and duplex mode.

If the station on the other side of the link attempts to auto-negotiate with a device 10/100/1000BaseT port that is configured to full duplex, the auto-negotiation results in the station attempting to operate in half duplex.

MDI/MDIX

The device supports auto-detection of straight through and crossed cables on all switching 10/100/1000BaseT ports. The feature is part of the Auto-negotiation and is enabled when Auto-negotiation is enabled.

When the MDI/MDIX (Media Dependent Interface with Crossover) is enabled, the automatic correction of errors in cable selection is possible, making the distinction between a straight through cable and a crossover cable irrelevant. (The standard wiring for end stations is known as MDI (Media Dependent Interface), and the standard wiring for hubs and switches is known as MDIX.)

Flow Control

The device supports 802.3x Flow Control for ports configured with the Full Duplex mode. By default, this feature is enabled. It can be enabled per port. The flow control mechanism allows the receiving side to signal to the transmitting side that transmission must temporarily be halted to prevent buffer overflow.

Back Pressure

The device supports back pressure for ports configured to half duplex mode. By default, this feature is disabled. It can be enabled per port. The back pressure mechanism prevents the transmitting side from transmitting additional traffic temporarily. The receiving side may occupy a link so it becomes unavailable for additional traffic.

36 Dell PowerConnect 28xx Systems User Guide

Switching Port Default Settings

The following table gives the port default settings.

Table 3-3. Port Default Settings

Function Default Setting

Port speed and mode 10/100/1000BaseT copper: auto-negotiation full duplex

Port forwarding state Enabled

Port tagging No tagging

Flow Control On

Back Pressure Off (disabled on ingress)

MDIX (not user-configurable) On (relevant to coppers ports only)

Dell PowerConnect 28xx Systems User Guide 37

38 Dell PowerConnect 28xx Systems User Guide

Starting and Configuring the Device

After completing all external connections, procede as follows:

• If the device is to be used as an unmanaged switch, there is no need for a terminal connection.

• A terminal connection is required if the device is to be used in a managed mode.

NOTE: The PowerConnect 2808 has an internal serial port.

NOTE: Before proceeding, read the release notes for this product. The release notes can be downloaded

from http://support.dell.com.

NOTE: It is recommended that you obtain the most recent revision of the user documentation from the Dell

support website at http://support.dell.com.

After completing all external connections, connect a terminal to the device to configure the device and for other procedures. For initial configuration, the standard device configuration is performed.

Dell PowerConnect 28xx Systems User Guide 39

Figure 4-1. Installation and Configuration Flow

Connect Device and

Console

Power On

Suspend

Bootup

Yes

Press Esc

Startup Menu (Special

Functions)

Reboot

Loading Program from

flash to RAM

Enter Wizard

Yes

Initial Configuration:

IP Address, Subnet

mask, Users Basic

Security Configuration

Wizard Configuration

Process

Advanced Configuration:

IP Address from DHCP

Standard Device Installation

Advanced Device Installation

Hardware Setup

Booting the Device - Managed Mode

The procedure described in this section refers to the device when set to operate as a managed switch. The PowerConnect 2808/16/24/48 models include a built-in dual purpose Mode Button. To change between

managed and unmanaged modes, press the Mode Button for less than seven seconds.

Once the device is set to operate as a managed switch the boot procedure can be monitored on the connected terminal as follows:

Ensure that the device console port is connected to a VT100 terminal device or VT100 terminal emulator via the RS-232 crossover cable.

Locate an AC power receptacle.

40 Dell PowerConnect 28xx Systems User Guide

Deactivate the AC power receptacle.

Connect the device to the AC receptacle.

Activate the AC power receptacle.

When the power is turned on with the local terminal already connected, the device goes through Power On Self Test (POST). POST runs every time the device is initialized and checks hardware components to determine if the device is fully operational before completely booting. If a critical problem is detected, the program flow stops. If POST passes successfully, a valid executable image is loaded into RAM. POST messages are displayed on the terminal and indicate test success or failure.

The boot process runs less than 45 seconds when in unmanaged mode (and approximately 90 seconds when in other modes.

Initial Configuration - Managed Mode

The information and procedures described in this section apply to the dewvice when set as a Managed Mode switch.

NOTE: The switch is factory-set in Unmanaged Mode.

NOTE: The initial simple configuration uses the following assumptions:

• The PowerConnect device was never configured before, and is in the same state as when you received it.

• The PowerConnect device booted successfully.

• The console connection is established and the console prompt is displayed on the screen of a VT100 terminal

device. (Press the <Enter> key several times to verify that the prompt displays correctly.)

The initial device configuration is through the Serial port. After the initial configuration, the device can then be managed either from the already connected Serial port or remotely through an interface defined during the initial configuration.

The system prompts you to use the Set-up wizard when the device boots up for the first time or if the configuration file is empty because the device is not configured. The Setup Wizard provides guidance through the initial device configuration, and gets the device up and running as quickly as possible.

NOTE: Obtain the following information from your network administrator before configuring the device:

• SNMP Community String and SNMP Management System IP address (optional).

• Username and Password.

• The IP address to be assigned to the VLAN 1 interface through which the device is to be managed (by default,

every external and internal port is a member of the VLAN 1)

• The IP subnet mask for the network

• The default gateway (next hop router) IP address for configuring the default route.

The Setup Wizard guides you through the initial device configuration, and gets the system up and running as quickly as possible. You can skip using the setup wizard and configure the device manually through the device CLI mode (see "Managing the Device Using the CLI" on page 157.

The Setup Wizard configures the following fields.

Dell PowerConnect 28xx Systems User Guide 41

• SNMP Community String and SNMP Management System IP address (optional)

• Username and Password

• Device IP address

• IP subnet mask

• Default Gateway IP address

The Setup Wizard displays the following information:

Welcome to Dell Easy Setup Wizard. The Setup Wizard guides you through the initial switch configuration,

and gets you up and running as quickly as possible. You can skip the setup wizard, and enter CLI mode to manually configure the switch. The system will prompt you with a default answer; by pressing enter, you accept the default. You must respond to the next question to run the setup wizard within 60 seconds, otherwise the system will continue with normal operation using the default system configuration.

Would you like to enter the setup wizard (you must answer this question within 60 seconds)? (Y/N)[Y] Y

If you select not to use the Setup Wizard, you can access the Web inteface by using the default IP

NOTE:

address/mask (192.168.2.1/255.255.255.0).

NOTE: You can exit the Setup Wizard at any time by entering [Ctrl+Z].

Wizard Step 1

The following information displays:

The system is not setup for SNMP management by default. To manage the switch using SNMP (required for Dell Network Manager)

you can: *Setup the initial SNMP Version 2 account now *Return later and setup additional SNMP v1/v2 accounts For more information on setting up SNMP accounts, please see the user

documentation. Would you like to setup the SNMP management interface now? (Y/N)[Y] Y

Enter [N] to skip to Step 2.

Enter [Y] to continue the Set-up wizard. The following information displays:

42 Dell PowerConnect 28xx Systems User Guide

To setup the SNMP management account you must specify the management system IP address and the "community string" or password that the particular management system uses to access the switch. The wizard automatically assigns the highest access level [Privilege Level 15] to this account.

You can use Dell Network Manager or CLI to change this setting, and to add additional management systems. For more information on adding management systems, see the user documentation.

To add a management station: Please enter the SNMP community string to be used:

[Dell_Network_Manager]

Please enter the IP address of the Management System (A.B.C.D) or wildcard(0.0.0.0) to manage from any Management Station:[0.0.0.0]

Wizard Step 2

The following information displays:

Now we need to setup your initial privilege (Level 15) user account. This account is used to login to the CLI, Telnet and Web interface. You may setup other accounts and change privilege levels later. For more information on setting up user accounts and changing

privilege levels,see the user documentation. To setup a user account: Enter the user name<1-20>:[admin] Please enter the user password:***** Please reenter the user password:*****

Wizard Step 3

The following information displays:

Next, an IP address is setup. The IP address is defined on the default VLAN ,(VLAN #2) . This is

the IP address you use to access the Telnet, Web interface, or SNMP interface for the switch. To setup an IP address:

Please enter the IP address of the device (A.B.C.D):10.6.22.100 Please enter the IP subnet mask (A.B.C.D or nn):[255.255.255.224]

Dell PowerConnect 28xx Systems User Guide 43

Wizard Step 4

The following information displays:

Finally, setup the default gateway. Please enter the IP address of the gateway from which this network is

reachable(e.g. 192.168.1.1).Default gateway (A.B.C.D):[10.6.22.97]

Enter the default gateway.

Press Enter. The following is displayed (as per the example parameters described):

This is the configuration information that has been collected: ============================================================== SNMP Interface = Dell_Network_Manager@0.0.0.0 User Account setup = admin Password = ********** Management IP address = 10.6.22.100 255.255.255.224 Default Gateway is 10.6.22.97 ==============================================================

Wizard Step 5

The following information displays:

If the information is correct, please select (Y) to save the configuration, and copy to the start-up configuration file. If the information is incorrect,select (N) to discard configuration and restart the wizard: (Y/N)[Y] Y

Configuring SNMP management interface.

Configuring user account.......

Configuring IP and subnet......

Thank you for using Dell Easy Setup Wizard.

Advanced Configuration

This section provides information about dynamic allocation of IP addresses.

When configuring/receiving IP addresses through DHCP, the configuration received from the server includes the IP address, and may include subnet mask and default gateway.

44 Dell PowerConnect 28xx Systems User Guide

Retrieving an IP Address From a DHCP Server

When using the DHCP protocol to retrieve an IP address, the device acts as a DHCP client. When the device is reset, the DHCP command is saved in the configuration file, but not the IP address. To configure the device so it will retrieve an IP address from a DHCP server, use the web interface (see "Defining DHCP Server Settings" on page 83).

NOTE: It is not necessary to delete the device configuration to retrieve an IP address from the DHCP server.

Startup Procedures

Startup Menu Procedures

The procedures called from the Startup menu cover software download, flash handling and password

only

recovery. The diagnostics procedures are for use by technical support personnel in the document.

The Startup menu can be entered when booting the device – a user input must be entered immediately after the POST test.

To enter the Startup menu:

Turn the power on and watch for the auto-boot message.

************************************************** ***************** SYSTEM RESET ***************** **************************************************

and are not disclosed

------ Performing the Power-On Self Test (POST) ------

UART Channel Loopback Test........................PASS

Testing the System SDRAM..........................PASS

Boot1 Checksum Test...............................PASS

Boot2 Checksum Test...............................PASS

Flash Image Validation Test.......................PASS

BOOT Software Version 1.0.0.20 Built 22-Jan-xxxx 15:09:28

Dell PowerConnect 28xx Systems User Guide 45

Processor: FireFox 88E6218 ARM946E-S , 64 MByte SDRAM. I-Cache 8 KB. D-Cache 8 KB. Cache Enabled.

Autoboot in 2 seconds - press RETURN or Esc. to abort and enter prom. Preparing to decompress...

When the auto-boot message appears, press <Enter> to get the Startup menu. The Startup menu procedures can be done using the ASCII terminal or Windows HyperTerminal.

[1] Download Software [2] Erase Flash File [3] Password Recovery Procedure [4] Enter Diagnostic Mode [5] Set Terminal Baud-Rate [6] Back Enter your choice or press 'ESC' to exit

The following sections describe the available Startup menu options.

NOTE: When selecting an option form the Startup menu, time out must be taken into account: if no selection is

made within 35 seconds (default), the device times out. This default value can be changed through CLI.

Software Download

The software download procedure is performed when a new version must be downloaded to replace the corrupted files, update or upgrade the system software. To download software from the Startup menu:

From the Startup menu,

press [1]

. The following prompt appears:

Downloading code using XMODEM

When using the HyperTerminal, click

In the

Filename

Ensure that the

Press

Send

NOTE: After software download, the device reboots automatically.

NOTE: The length of time taken by the download varies according to the tool used.

field, enter the file path for the file to be downloaded.

Xmodem

protocol is selected in the

. The software is downloaded.

Tr an sf e r

on the HyperTerminal Menu Bar.

Protocol

field.

Erase FLASH File

In some cases, the device configuration must be erased. If the configuration is erased, all parameters configured via CLI, EWS or SNMP must be reconfigured.

46 Dell PowerConnect 28xx Systems User Guide

Erasing the Device Configuration

From the Startup menu, displayed:

Warning! About to erase a Flash file. Are you sure (Y/N)? y

Press Y. The following message is displayed.

Write Flash file name (Up to 8 characters, Enter for none.):config File config (if present) will be erased after system initialization ======== Press Enter To Continue ========

Enter

config

Repeat the device initial configuration.

as the name of the flash file. The configuration is erased and the device reboots.

press [2]

within two seconds to erase flash file. The following message is

Password Recovery

If a password is lost, the Password Recovery procedure can be called from the Startup menu. The procedure enables entry to the device once without password.

To recover a lost password for the local terminal only:

From the Startup menu, type 3

The password is deleted.

NOTE: To ensure device security, reconfigure passwords for applicable management methods.

and press <Enter>.

Software Download Through TFTP Server

This section contains instructions for downloading device software (system and boot images) through a TFTP server. The TFTP server must be configured before beginning to download the software.

System Image Download

The device boots and runs when decompressing the system image from the flash memory area where a copy of the system image is stored. When a new image is downloaded, it is saved in the other area allocated for the other system image copy.

On the next boot, the device will decompress and run the currently active system image unless chosen otherwise.

To download a system image through the TFTP server:

Ensure that an IP address is configured on one of the device ports and pings can be sent to a TFTP server.

Make sure that the file to be downloaded is saved on the TFTP server (the

Dell PowerConnect 28xx Systems User Guide 47

ros

file).

Enter

copy tftp://{tftp address}/{file name} i mage

to copy a new system image to the device. When the new image is downloaded, it is saved in the area allocated for the other copy of system image. The following is an example of the information that appears:

console# copy tftp://176.215.31.3/file1.ros image Accessing file ‘file1’ on 176.215.31.3Ö Loading file1 from 176.215.31.3: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Copy took 00:01:11 [hh:mm:ss]

Exclamation symbols indicate that a copying process is in progress. Each symbol (!) corresponds to 512 bytes transferred successfully. A period indicates that the copying process is timed out. Many periods in a row indicate that the copying process failed.

Enter the

console# reload This command will reset the whole system and disconnect your current session. Do you want to continue (y/n) [n]?

Enter y. The device reboots.

Boot Image Download

reload

command. The following message is displayed:

Loading a new boot image from the TFTP server and programming it into the flash updates the boot

image. The boot image is loaded when the device is powered on. A user has

control over the boot

image copies. To download a boot image through the TFTP server:

Ensure that an IP address is configured on one of the device ports and pings can be sent to a TFTP server.

Ensure that the file to be downloaded is saved on the TFTP server (the

Enter

copy tftp://{tftp address}/{file name} boot

rfb

file).

to copy the boot image to the

device. The following is an example of the information that appears:

console# copy tftp://176.215.31.3/332448-10018.rfb boot Erasing file..done. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Copy: 2739187 bytes copied in 00:01:13 [hh:mm:ss]

Enter the

reload

command. The following message is displayed:

console# reload This command will reset the whole system and disconnect your current

48 Dell PowerConnect 28xx Systems User Guide

session. Do you want to continue (y/n) [n]?

Enter y.

The device reboots.

Management Modes

The device supports the following modes:

•

Managed Mode

you can move to Unmanaged mode by pressing the Mode button on the device, or you can move to Secure mode using the web interface (see "Entering Secure Mode" on page 63). Before leaving Managed mode it is highly recommended to save the configuration (see "Uploading Files" on page 82).

Unmanaged Mode

• web management interface, the CLI works in debug mode only; and there is no configuration in the CDB—default configuration is used. From this mode, you can return to Managed mode by pressing the Mode button on the device.

Secure Mode

• configuration changes by removing the IP address of the device so that it becomes inaccessible for configuration. In this mode, no web management interface is available, and CLI works in debug mode only. From this mode, you can return to Managed mode by pressing the Mode button on the device.

All modes are maintained through power cycles. The Managed Mode LED provides an indication of the current mode (see "On the PowerConnect 28xx front panel there is a Managed Mode LED monitoring the switch node as well as indicating diagnostic test results. The following table describes the Managed Mode LED indications. For more information about management modes and transitioning between them, see "Management Modes" on page 50." on page 22).

— Provides switch management through the web interface. From Managed mode,

— In this mode, the device does not have an IP address; STP is disabled; there is no

— This mode keeps the existing configuration active, but it prevents users from making

Default Values

The factory default values, used when the device is in Unmanaged mode, include:

• IP Address — 192.168.2.1

• Netmask — 255.255.255.0

•Username — admin

• Permission — R/W privilege

•DHCP Client — Off

• Flow Control — On

•STP — Off

Dell PowerConnect 28xx Systems User Guide 49

Transitioning Between Modes

The following diagram summarizes movement between modes:

Figure 4-2. Transitioning Between Management Modes

50 Dell PowerConnect 28xx Systems User Guide

Returning to Managed Mode

When returning to Managed mode from either Unmanaged or Secure mode, the Restore Saved Configuration page appears. This page can be used to retrieve a saved configuration. You can also change the device IP address using this page.

Figure 4-3. Restore Saved Configuration

•

Local Configuration

•

Server IP Address/File Name

•

Use Saved IP/User Name/Password —

— No saved configuration is loaded.

— Loads a previously saved configuration.

When restoring local configuration, this option uses the IP address, user name and password that were automatically saved when you exited Managed mode. When restoring a saved configuration, this option uses the IP address, user name and password inside the saved configuration.

Use Current IP/User Name/Password —

•

When restoring local configuration, this option uses the

system default IP address, user name and password.

•

Apply Changes

— The selected configuration is restored and the device reboots.

Dell PowerConnect 28xx Systems User Guide 51

52 Dell PowerConnect 28xx Systems User Guide

Using Dell OpenManage Switch Administrator

This section provides an introduction to the user interface.

Understanding the Interface

The home page contains the following views:

•

Tree View

of the features and their components.

•

Device View

device, an information or table area, and configuration instructions.

Figure 5-1. Switch Administrator Components

— Located on the left side of the home page, the tree view provides an expandable view

— Located on the right side of the home page, the device view provides a view of the

Table 5-1 lists the interface components with their corresponding numbers.

Dell PowerConnect 28xx Systems User Guide 53

Table 5-1. Interface Components

Component Name

1 The tree view contains a list of the different

device features. The branches in the tree view can be expanded to view all the components under a specific feature, or retracted to hide the feature's components. By dragging the vertical bar to the right, the tree area can be expanded to display the full name of a component.

2 The device view provides information about

device ports, current configuration and status, table information, and feature components.

Depending on the option selected, the area at the bottom of the device view displays other device information and/or dialogs for configuring parameters.

3 The components list contains a list of the feature

components. Components can also be viewed by expanding a feature in the tree view.

4 The information buttons provide access to

information about the device and access to Dell Support. For more information, see "Information Buttons."

Device Representation

The PowerConnect home page contains a graphical device representation of the front panel.

Figure 5-2. Port LED Indicators

54 Dell PowerConnect 28xx Systems User Guide

The port coloring indicates if a specific port is currently active. Ports can be the following colors:

Table 5-2. Led Indicators

Component Name

Port Indicators

Green The port is currently enabled.

Red An error has occurred on the port.

Blue The port is currently disabled.

NOTE: The Port LEDs are not reflected in PowerConnect front panel in the PowerConnect OpenManage Switch

Administrator. LED status can only be determined by viewing the actual device. For more information about LEDs, see "LED Definitions" on page 21.

Using the Switch Administrator Buttons

This section describes the buttons found on the OpenManage Switch Administrator interface.

Information Buttons

Information buttons provide access to on-line support and online help, as well as information about the OpenManage Switch Administrator interfaces.

Table 5-3. Information Buttons

Button Description

Support Opens the Dell Support page at

support.dell.com.

Help Online help containing information to assist in

configuring and managing the online help pages are linked directly to the page currently open. For example, if the IP Addressing page is open, the help topic for that page opens when Help is clicked.

About Contains the version and build number and Dell

Log Out Logs out of the application and closes the

browser window.

device

. The

Dell PowerConnect 28xx Systems User Guide 55

Device Management Buttons

Device Management buttons provide an easy method of configuring device information, and includes the following:

Table 5-4. Device Management Buttons

Button Description

Apply Changes Applies changes to the device.

Add Adds information to tables or dialogs.

Te ln e t Starts a Telnet session.

Query Queries tables.

Show All Displays the

Left arrow/Right arrow Moves information between lists.

Refresh Refreshes device information.

Reset All Counters Clears statistic counters.

Print Prints the Network Management System page and/or

table information.

Draw Creates statistics charts on-the-fly.

device tables.

Starting the Application

Open a web browser.

Enter the device’s IP address (as defined in the CLI) in the address bar and press <Enter>.

For information about assigning an IP address to a device, see "Static IP Address and Subnet Mask."

When the

management modes, see "Management Modes" on page 49.

Click OK.

The

Enter Network Password

NOTE: The device is not configured with a default password, and can be configured without entering a

password. For information about recovering a lost password, see “Password Recovery.

NOTE: Passwords are both case sensitive and alpha-numeric.

NOTE: The device can be managed via web interface only in Managed mode. For more information about

Dell PowerConnect OpenManage™ Switch Administrator

window opens, enter a user name and password.

home page opens.

Access Levels

When you login to the device, you are automatically assigned one of the following modes, based upon the access level assigned to you:

56 Dell PowerConnect 28xx Systems User Guide

•

Management

•

Monitor

— This is a read-write mode where you can see and edit all pages of the interface.

— This is a read-only mode where you can see a subset of the interface pages, but you cannot

edit them.

For more information about setting the access level, see ("Defining the Local User Databases" on page 69).

Dell PowerConnect 28xx Systems User Guide 57

58 Dell PowerConnect 28xx Systems User Guide

Configuring System Information

This section provides information for defining system parameters including security features, downloading device software, and resetting the device. To open the System page, click System in the tree view.

Figure 6-1. System

Defining General Device Information

The General page contains links to pages for configuring device parameters.

Viewing Device Information

The Asset page contains parameters for configuring general device information, including the system name, location, and contact, the system MAC Address, System Object ID, date, time, and System Up Time. To open the Asset page, click System

→ General → Asset in the tree view.

Update with your book title 59

Figure 6-2. Asset

•

System Name (0-159 Characters)

•

System Contact (0-159 Characters)

•

System Location (0-159 Characters)

•

MAC Address

•

Sys Object ID

— Specifies the device MAC address.

— Specifies the vendor's authoritative identification of the network management

— Defines the user-defined device name.

— Specifies the name of the contact person.

— Specifies the location where the system is currently running.

subsystem contained in the entity.

•

Service Tag

•

Asset Tag (0-16 Characters)

•

Serial No.

•

Date (DD/MMM/YY

— Specifies the service reference number used when servicing the device.

— Specifies the user-defined device reference.

— Specifies the device serial number.

) — Specifies the current date. The format is day, month, year, for example,

10/NOV/02 is November 10, 2002.

•

Time (HH:MM:SS)

— Specifies the time. The format is hour, minute, second, for example, 20:12:03

is eight twelve and three seconds in the evening.

•

System Up Time

— Specifies the amount of time since the last device reset. The system time is displayed in the following format: Days, Hours, Minutes and Seconds. For example, 41 days, 2 hours, 22 minutes and 15 seconds.

60 Update with your book title

Defining System Information:

Open the

Define the relevant fields.

Click

Asset

page.

Apply Changes

The system parameters are defined, and the device is updated.

Initiating a Telnet Session:

Open the

Click

Asset

Te ln et

page.

A Telnet session is initiated.

Viewing the Versions Page

The Ver si on s page contains information about the hardware and software versions currently running. To open the Ve rs io ns

Figure 6-3. Versions

page, click System→ General→ Vers ion s in the tree view.

•

Software Version

•

Boot Version

•

Hardware Version

— The current software version running on the device.

— The current Boot version running on the device.

— The current hardware version.

Update with your book title 61

Resetting the Device

The Reset page enables the device to be reset from a remote location. For more information about saved Configuration files, see "Managing Files" on page 80

. To op en th e Reset

Reset in the tree view.

Figure 6-4. Reset

Resetting the Device

Open the

Click

Reset page

reset

A confirmation message displays.

Click OK.

The device is reset. After the device is reset, a prompt for a user name and password displays.

page, click System → General →

Enter a user name and password to reconnect to the Web Interface.

62 Update with your book title

Entering Secure Mode

The Secure Mode page allows you to put the device in the prevents users from making any further configuration changes to the switch. This is done by removing the IP address of the switch so that it becomes inaccessible. In Secure Mode the switch retains configuration through power cycles just like in Managed Mode.

To use Secure Mode, configure the device in Managed Mode, and then switch to Secure Mode via the web interface. To exit Secure Mode, press the Managed Mode button on the device to enter the Managed Mode default configuration with the default IP address of 192.168.2.1. For information about management modes, see "Management Modes" on page 49. For information about saving Configuration files, see "Managing Files" on page 80

To open the Secure Mode page, click System → General → Secure Mode in the tree view.

Figure 6-5. Secure Mode

Secure

management mode. Once enabled, it

Entering Secure Mode

Open the

Click

Secure Mode page.

Secure

A confirmation message displays.

Click OK.

The device enters Secure mode.

Update with your book title 63

Defining Device IP Addresses

The IP Addressing page contains links for assigning interface and default gateway IP addresses, and enabling or disabling DHCP.

To open the IP Addressing page, click System

Defining IP Interface Parameters

The IP Interface Parameters page is used to select whether the device IP address, mask and/or gateway is assigned statically, or dynamically using DHCP. The page is also used to make static assignments, and to approve dynamic assignments received from the DHCP server before they go into affect (until approval, the old address is used).

To op en th e the tree view.

Figure 6-6. IP Interface Parameters

IP Interface Parameters page, click System→ IP Addressing → IP Interface Parameters in

→ IP Addressing in the tree view.

•

DHCP

— The DHCP client can be enabled to acquire the network configuration dynamically. The

DHCP default value is Disable. This field enables the DHCP client.

•

IP Address

•

Subnet Mask

•

Default Gateway

•

DHCP IP Address

•

DHCP Subnet Mask

64 Update with your book title

— Specifies the static IP Address currently assigned to the device.

— Specifies the subnet mask of the static IP Address, currently assigned to the device.

— Specifies the static Default Gateway Address, currently assigned to the device.

— Specifies the IP Address received from the DHCP server.

— Specifies the Subnet Mask received from the DHCP server.

•

DHCP Default Gateway

•

Apply DHCP Address

Address, received from the DHCP server.

Enabling DHCP:

Open the

Set

Click the

Click

DHCP is enabled and the device is updated.

Setting static IP Interface parameters:

Open the

Set

Set the

Click

The static interface parameters are set and the device is updated.

IP Interface Parameters

DHCP

Enable

Apply DHCP Address

Apply Changes

IP Interface Parameters

DHCP

Disable

IP Address, Subnet Mask

Apply Changes

— Defines the Default Gateway Address received from the DHCP server.

— Activates the IP Address, Subnet Mask Address, and Default Gateway

page

checkbox.

page

and

Default Gateway

Running Cable Diagnostics

The Diagnostics page contains links to pages for performing virtual cable tests on copper and fiber optics cables.To open the Diagnostics page, click System → Diagnostics in the tree view.

Viewing Copper Cable Diagnostics

The Integrated Cable Test for Copper Cables page contains fields for performing tests on copper cables. Cable testing provides information about where errors occurred in the cable, the last time a cable test was performed, and the type of cable error which occurred. The tests use Time Domain Reflectometry (TDR) technology to test the quality and characteristics of a copper cable attached to a port. Cables up to 120 meters long can be tested. Cables are tested when the ports are in the down state, with the exception of the Approximated Cable Length test. The cable length returned is an approximation in the ranges of up to 50 meters, 50m-80m, 80m-110m, 110m-120m, or more than 120m. The deviation may be up to 20 meters.

To open the Integrated Cable Test for Copper Cables page, click System→ Diagnostics→ Integrated Cable Test in the tree view.

Update with your book title 65

Figure 6-7. Integrated Cable Test for Copper Cables

•

Port

— The port to which the cable is connected.

•

Test Result

–

No Cable

–

Open Cable

–

Short Cable

–

Fiber Cable

•

Cable Fault Distance

•

Last Update

•

Approximate Cable Length

— The cable test results. Possible values are:

— There is no cable connected to the port.

— The cable is connected on only one side.

— The cable is 2 meters long.

— The cable passed the test.

— A fiber cable is connected to the port.

— The distance from the port where the cable error occurred.

— The last time the port was tested.

— The approximate cable length. This test can only be performed when

the port is up and operating at 1 Gbps.

Performing a Cable Test

Ensure that both ends of the copper cable are connected to a device.

Open the

Click

Integrated Cable Test for Copper Cables

Test No w

The copper cable test is performed, and the results are displayed on the

Copper Cables

page.

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page.

Integrated Cable Test for

Displaying Virtual Cable Test Results Table

Open the

Click

The

Viewing Optical Transceiver Diagnostics

Integrated Cable Test for Copper Cables

Show All

Virtual Cable Test Results Table

opens.

page.

The Optical Transceiver Diagnostics page contains fields for performing tests on Fiber Optic cables. Optical transceiver diagnostics can be performed only when the link is present. To open the Optical Transceiver Diagnostics page, click System→ Diagnostics→ Optical Transceiver Diagnostics in the tree view.

Figure 6-8. Optical Transceiver Diagnostics

•

Port

— The port to which the fiber cable is connected.

•

Te mp e ra t ur e

•

Vo lt ag e

•

Current

•

Output Power

•

Input Power

•

Transmitter Fault

— The voltage at which the cable is operating.

— The current at which the cable is operating.

— The temperature (in Celsius) at which the cable is operating.

— The rate at which the output power is transmitted.

— The rate at which the input power is transmitted.

— Indicates if a fault occurred during transmission.

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•

Loss of Signal

•

Data Ready

Displaying Optical Transceiver Diagnostics Test Results Table

Open the

Click

Show All

— Indicates if a signal loss occurred in the cable.

— The transceiver has achieved power up and data is ready.

Optical Transceiver Diagnostics

page.

The test is run and the Virtual Cable Test Results Table opens with the following columns:

•

Te mp

— Internally measured transceiver temperature.

•

Vo lt ag e

•

Current

•

Output Power

•

Input Power

•

TX Fault

— Internally measured supply voltage.

— Measured TX bias current.

— Measured TX output power in milliwatts.

— Measured RX received power in milliwatts.

— Transmitter fault.

Finisair transceivers do not support the transmitter fault diagnostic testing.

•

LOS

— Loss of signal.

•

Data Ready

•

N/A

— Not Available, N/S - Not Supported, W - Warning, E - Error.

— The transceiver has archived power up and data is ready.

Fiber Optic analysis feature works only on SFPs that support the digital diagnostic standard SFF-4872.

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Managing Device Security

The Management Security page provides access to security pages that contain fields for setting security parameters for user database, password and RADIUS security. To open the Management Security page click System→Management Security in the tree view.

Defining the Local User Databases

The Local User Database page contains fields for defining users, passwords and access levels. To open the Local User Database

Figure 6-9. Local User Database

page, click System→ Management Security→ Local User Database in the tree view.

•

User Name

•

Access Level

level. Users with access level 15 are Privileged Users, and only they can access and edit all pages of the OpenManage Switch Administrator.

•

Password (0-64 Characters)

•

Confirm Password

•

Remove

Assigning Access Rights to a User:

Open the

Select a user in the

Define the fields.

— List of users.

— User access level. The lowest user access level is 1 and 15 is the highest user access

— User-defined password.

— Confirms the user-defined password.

— Removes users from the

Local User Database page.

User Name

field.

User Name

list, when selected.

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Click

Apply Changes

The user access rights and passwords are defined, and the device is updated.

Defining a New User:

Open the

Click

The

Figure 6-10. Add a User

Define the fields.

Click

Local User Database page.

Add

Add User page opens:

Apply Changes

The new user is defined, and the device is updated.

Displaying the Local User Table:

Open the

Click

The

Figure 6-11. Local User Table

Deleting Users:

Open the

Local User Database page.

Show All.

Local User Table

opens:

Local User Database page.

70 Update with your book title

Click

Show All.

The

Select a

Select the

Click

Local User Table

User Name.

Remove

Apply Changes

opens.

check box.

The selected user is deleted and the device is updated.

Configuring RADIUS Global Parameters

Remote Authorization Dial-In User Service

RADIUS servers provide a centralized authentication method for:

•Telnet Access

•Web Access

• Console to Device Access

To open the RADIUS Settings page, click System → Management Security → RADIUS in the tree view.

Figure 6-12. RADIUS Settings

(RADIUS) servers provide additional security for networks.

•

IP Address

— The list of Authentication Server IP addresses.

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•

Priority (0-65535)

— Specifies the server priority. The possible values are 0-65535, where 0 is the

highest value. This is used to configure the order in which servers are queried.

•

Authentication Port

— Identifies the authentication port. The authentication port is used to verify

the RADIUS server authentication.

•

Number of Retries (1-10)

— Specifies the number of transmitted requests sent to RADIUS server

before a failure occurs. The possible field values are 1 - 10. Three is the default value.

•

Timeout for Reply (1-30

) — Specifies the amount of the time in seconds the device waits for an answer from the RADIUS server before retrying the query, or switching to the next server. The possible field values are 1 - 30. The default is 3.

•

Dead Time (0-2000)

— Specifies the amount of time (in seconds) that a RADIUS server is bypassed

for service requests. The range is 0-2000.

•

Key String (0-128 Characters)

— Specifies the Key string used for authenticating and encrypting all

RADIUS communications between the device and the RADIUS server. This key is encrypted.

•

Source IP Address

— Specifies the source IP address that is used for communication with RADIUS

servers.

If host-specific Timeouts, Retries, or Dead time values are not specified, the Global values (Defaults) are applied to each host. The following fields set the RADIUS default values:

•

Default Retries (1-10)

— Specifies the default number of transmitted requests sent to RADIUS server

before a failure occurs.

•

Default Timeout for Reply (1-30)

— Specifies the default amount of the time (in seconds) the device

waits for an answer from the RADIUS server before timing out.

•

Default Dead time (0-2000)

— Specifies the default amount of time (in seconds) that a RADIUS

server is bypassed for service requests. The range is 0-2000.

•

Default Key String (0-128 Characters)

— Specifies the Default Key string used for authenticating and encrypting all RADIUS communications between the device and the RADIUS server. This key is encrypted.

•

Source Address

— Specifies the source IP address that is used for communication with RADIUS

servers.

Defining RADIUS Parameters:

Open the

Define the fields.

Click

RADIUS Settings

Apply Changes

The RADIUS setting are updated to the device.

Adding a RADIUS Server:

Open the

RADIUS Settings

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page.

Click

Add

The

Add RADIUS Server

Figure 6-13. Add RADIUS Server Page

Define the fields.

Click

Apply Changes

page opens:

The new RADIUS server is added, and the device is updated.

Displaying the RADIUS Server List:

Open the

Click

The

RADIUS Settings

Show All

page.

Show all RADIUS Servers page opens:

Figure 6-14. Show all RADIUS Servers

Modifying the RADIUS Server Settings:

Open the

RADIUS Settings

page.

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Click

Show All

The

RADIUS Servers List

Modify the relevant fields.

Click

Apply Changes

The RADIUS Server settings are modified, and the device is updated.

Deleting a RADIUS Server for the RADIUS Servers List:

Open the

Click

Show All

The

RADIUS Servers List

Select a RADIUS Server in the

Select the

Click

Apply Changes

The RADIUS server is removed from the

page opens.

RADIUS Settings

page opens.

Remove check box.

page.

RADIUS Servers List

Defining SNMP Parameters

Simple Network Management Protocol (SNMP) provides a method for managing network devices. Devices supporting SNMP run a local software (agent).

The SNMP agents maintain a list of variables, which are used to manage the device. The variables are defined in the Management Information Base (MIB). The MIB contains the variables controlled by the agent. The SNMP protocol defines the MIB specification format, as well as the format used to access the information over the network.

Access rights to the SNMP agents are controlled by access strings. To communicate with the device, the Embedded Web Server submits a valid community string for authentication. To open the SNMP page, click System → SNMP in the tree view.

This section contains information for managing the SNMP configuration.

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Defining SNMP Global Parameters

The SNMP Global Parameters page permits enabling both SNMP and Authentication notifications.To open the SNMP Global Parameters page, click System → SNMP → Global Parameters in the tree view.

Figure 6-15. Global Parameters

•

SNMP Notifications

•

Authentication Notifications

authentication fails.

Enabling SNMP Notifications

Open the

Select

Click

SNMP Global Parameters

Enable

Apply Changes

SNMP notifications are enabled, and the device is updated.

— Enables or disables the device sending SNMP notifications.

— Enables or disables the device sending SNMP traps when

page.

in the

SNMP Notifications

field.

Enabling Authentication Notifications

Open the

Select Enable in the

Click

SNMP Global Parameters

Authentication Notifications

Apply Changes

page.

field.

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Defining Communities

Access rights are managed by defining communities in the Community Table. When the community names are changed, access rights are also changed.To open the SNMP Community page, click System → SNMP → Community in the tree view.

Figure 6-16. SNMP Community

•

SNMP Management Station

•

Community String

— Functions as a password and used to authenticate the selected management

station to the device.

•

Access Mode

–

Read Only

— Defines the access rights of the community. The possible field values are:

— The management access is restricted to read-only, for all MIBs except the

community table, for which there is no access.

–

Read Write

— The management access is read-write, for all MIBs except the community table, for

which there is no access.

–

SNMP Admin

— The management access is read-write for all MIBs, including the community

table.

•

Remove

Defining a New Community

Open the

Click

The

— Removes a community, when selected.

SNMP Community

Add

Add SNMP Community

76 Update with your book title

— A list of management station IP addresses.

page.

page opens:

Figure 6-17. Add SNMP Community

Select one of the following:

–

SNMP Management Station

–

All

— Defines an SNMP community for all management stations.

Define the remaining fields.

Click

Apply Changes

— Defines an SNMP community for a specific management station.

The new community is saved, and the device is updated.

Displaying all Communities

Open the

Click

The

Figure 6-18. Community Table

SNMP Community

Show All.

Community Table

page.

opens:

Deleting Communities

Open the

Click

The

Select a community from the

Community Table

Show All.

Community Table

page.

opens.

Community Table.

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Select the

Click

The selected community entry is deleted, and the device is updated.

Remove

Apply Changes

check box.

Defining SNMP Notification Recipients

The Notification Recipients page contains information for defining filters that determine whether traps are sent to specific users, and the trap type sent. SNMP notification filters provide the following services:

• Identifying Management Trap Targets

•Trap Filtering

• Selecting Trap Generation Parameters

• Providing Access Control Checks

To open the Notification Recipients page, click System → SNMP → Notification Recipient in the tree view.

Figure 6-19. Notification Recipients

•

Recipient IP

•

Community String

station to the device.

•

Notification Version

–

SNMPv1

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— Indicates the IP address to whom the traps are sent.

— Functions as a password and used to authenticate the selected management

— Determines the trap type. The possible field values are:

— SNMP Version 1 traps are sent.

–

SNMPv2

•

Remove Notification Recipient

Adding a new Trap Recipients

Open

Click

Add

— SNMP Version 2 traps are sent.

Notification Recipients

page.

— When checked, removes selected notification recipients.

The Add Notification Recipients page opens:

Define the relevant fields.

Click

Apply Changes

The notification recipient is added, and the device is updated.

Displaying Notification Recipients Tables

Open

Notification Recipients

Click

Show All

page.

The Notification Recipients Tables page opens:

Figure 6-20. Notification Recipients Tables

Deleting Notification Recipients

Open

Notification Recipients

page.

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Click

Show All

The Notification Recipients Tables page opens.

Select a notification recipient.

Check the

Click

Apply Changes

Remove

checkbox.

. The recipient is deleted, and the device is updated.

Managing Files

The File Management page contains fields for managing device software, the Image Files, and the Configuration Files. Files can be downloaded from a TFTP server.

The configuration file structure consists of the following configuration files:

•

Startup Configuration File

settings as when the device is powered down or rebooted.

•

Running Configuration File

during the current session. After the device is powered down or rebooted, all commands stored in the Running Configuration file are lost. During the startup process, all commands in the Startup file are copied to the Running Configuration File and applied to the device. During the session, all new commands entered are added to the commands existing in the Running Configuration file. Commands are not overwritten.

Image File

• from the image.

To op en th e File Management page, click System → File Management in the tree view.

— System file images are saved in a Flash File called an image. The device boots and runs

— Contains the commands required to reconfigure the device to the same

— Contains all Startup file commands, as well as all commands entered

Downloading Files

The File Download From Server page contains fields for downloading system image and Configuration files from the TFTP server or HTTP client to the device. To open the File Download From Server page, click System → File Management → File Download in the tree view.

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Figure 6-21. File Download From Server

•

Firmware Download — Configuration Download

•

Configuration Download —

selected, the

•

Download via TFTP

•

Download via HTTP

Firmware Download

The Firmware file is downloaded. If

fields are grayed out.

The Configuration file is downloaded. If

— Enables initiating an image download via the TFTP server.

— Enables initiating an image download via the HTTP server.

fields are grayed out.

Firmware Download

Configuration Download

is selected, the

Firmware Download

•

Server IP Address —

•

Source File Name —

•

Destination File Name

possible field values are:

–

Software Image

–

Boot Code

Configuration Download

•

Server IP Address

The Server IP Address from which the firmware files are downloaded.

Indicates the file to be downloaded.

— The destination file to which the configuration file is downloaded. The

— Downloads the software image file.

— Downloads the boot file.

— The Server IP Address from which the configuration files are downloaded.

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•

Source File Name (1-64 Characters)

— Indicates the configuration files to be downloaded.

During the image file download, a dialog box opens which displays the download progress.

Downloading Files

Open the

Define the fields.

Click

File Download From Server

Apply Changes

page.

The software is downloaded to the device.

Uploading Files

The File Upload to Server page contains fields for uploading the Configuration file from the device to the TFTP server. To open the File Upload to Server page, click System → File Management → File Upload in the tree view.

Figure 6-22. File Upload to Server

The File Upload to Server page contains the following fields:

•

Upload via TFTP

•

Upload via HTTP

•

TFTP Server IP Address

•

Destination File Name (1-64 Characters) —

— Enables initiating a configuration file upload via the TFTP server.

— Enables initiating a configuration file upload via the FTP server.

— The Server IP Address to which the file is uploaded.

Indicates the file path to which the file is uploaded.

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Uploading Files

Open the

Define the fields.

Click

The software is uploaded to the device.

File Upload to Server

Apply Changes

page.

Restoring Default Settings

The Restore Defaults page allows you to restore the device settings to their factory default values. To open the Restore Defaults page, click System → File Management → Restore Defaults in the tree view.

Figure 6-23. Restore Defaults

The Restore Defaults page contains the following field:

•

Restore Configuration Factory Defaults

Restoring Default Settings

Open the

Check the

Click

The settings are restored.

Restore Defaults

Restore Configuration Factory Defaults

Apply Changes

page.

— Sets the device settings to their factory default values.

checkbox.

Defining DHCP Server Settings

The DHCP server is used mainly for centralized control over assignment of IP addresses to attached hosts.

A switch can operate as either a DHCP client (obtaining its own IP from a DHCP server) and as a DHCP server.

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The DHCP server uses a defined pool of IP addresses (user-defined) from which it allocates IP addresses to DHCP clients.

The DHCP server can allocate IP addresses in three configuration modes:

•

Static allocation

— The network administrator maps the hardware address of a host to an IP address

on the DHCP server.

•

Permanent allocation

— An IP address received through a standard request-reply mechanism is owned by a client permanently (unless changes in the network environment/connections take place, for any reason).

•

Dynamic allocation

— A network device obtains a leased IP address for a specified period of time. The

IP address is revoked at the end of this period and the switch must request another IP address.

This section contains information for configuring a DHCP server on a DHCP-server-enabled switch.

To open the DHCP Server page, click System

→ DHCP Server in the tree view.

Configuring DHCP Properties

The DHCP Server Properties page contains fields for enabling the DHCP server and configuring pinging capability. The DHCP Server pings a pool address before assigning this address to a requesting client. If the ping is unanswered, the DHCP Server assumes (with a high probaility) that the address is not in use and assigns the address to the requesting client. To open the DHCP Server Properties page, click System

→ DHCP Server → DHCP Server Properties in the tree view.

Figure 6-24. DHCP Server Properties

•

DHCP Server Status

–

Enable

— Enables the DHCP server.

–

Disable

— Disables the DHCP server. This is the default value.

— Indicates if the DHCP server is enabled. The possible field values are:

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•

DHCP Ping

— Indicates if the DHCP server is set to ping the offered IP address before responding to

a client request, to ensure that the address is not in use. The possible field values are:

–

Enable

— Enables ping on the DHCP server.

–

Disable

•

DHCP Ping Retries

— Disables ping on the DHCP server. This is the default value.

— Optionally specifies the number of pings that are sent before an IP address can

be assigned to a requesting client. The range is 1 to 10 and the default value is two.

–

Use Default

•

DHCP Ping Timeout

— Reverts to the default Ping Retries setting (2 retries).

— Optionally specifies the amount of time (in milliseconds) the DHCP server waits for a ping reply before it stops attempting to reach a pool address, prior to assigning this address to a requesting client. Default timeout is 500 milliseconds.

–

Use Default

Enabling the DHCP Server

Open the

Select

Enable

Optionally, select

Define the number of ping retries in the

— Reverts to the default Ping Timeout (500 milliseconds).

DHCP Server Properties

in the

DHCP Server Status

Enable

in the

page.

field.

DHCP Ping

field to enable ping globally.

DHCP Ping Retries

field, or click

Use Default

to select the

default number of two retries.

Define the amount of time (in milliseconds) the DHCP server waits for a ping reply in the

Ping Timeout

Click

field, or click

Apply Changes

Use Default

to select the default timeout of 500 milliseconds.

The server is enabled.

DHCP

Defining Network Pool

The Network Pool page displays the DHCP Server's created pool name. The pool name, which is typically assigned to a network segment, consists of an IP address range from which the DHCP Server allocates IP addresses to DHCP clients. You can define the lease duration of the network pool.

To open the Network Pool page, click System

→ DHCP Server → Network Pool in the tree view.

Update with your book title 85

Figure 6-25. Network Pool

•

Subnet IP Address

•

Network Mask

•

Prefix Length

•

Address Pool Start —

•

Address Pool End —

•

Lease Duration

— Specifies the IP address of the subnet in which the network pool resides.

— Specifies the pool’s network mask.

— Specifies the number of bits that comprise the address prefix.

Specifies the first IP address in the range of the network pool.

Specifies the last IP address in the range of the network pool.

— Specifies the amount of time a DHCP client can use an IP address from this pool. The total lease duration is 4294967295 seconds, i.e. 49710.2696 days. Thus a lease of 49710 days, 0 hours, 0 minutes and 0 seconds is a legal value, while a lease of 49710 days, 23 hours, 59 minutes and 59 seconds results in an Out of Range alert.

Days

–

— Specifies the duration of the lease in number of days. The range is 0 to 49710 days.

Hours

— Specifies the number of hours in the lease. A days value must be supplied before an

hours value can be added. The range is 0 to 23 hours.

–

Minutes

— Specifies the number of minutes in the lease. A days value and an hours value must be

added before a minutes value can be added. The range is 0 to 59 minutes.

–

Infinite

•

Used Pool’s Addresses —

•

Default Router —

•

Domain Name Server —

— Specifies that the duration of the lease is unlimited.

Specifies the number of the pool’s addresses that are currently used.

Specifies the default router for the DHCP client.

Specifies the DNS server available to the DHCP client.

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•

Domain Name —

Specifies the domain name for a DHCP client. The domain name may contain up

to 32 characters.

•

NetBIOS WINS Server —

•

NetBIOS Node Type —

Specifies the NetBIOS WINS name server available to a DHCP client.

A parameter that informs the workstation how to resolve the NetBIOS name.

Valid node types are:

–

Blank —

–

Broadcast —

The workstation is not informed as to what type of NetBIOS node the client is.

IP broadcast messages are used to register and resolve NetBIOS names to IP

addresses.

–

Peer-to-Peer —

Point-to-point communications with a NetBIOS name server are used to register

and resolve computer names to IP addresses.

–

Mixed —

A combination (mix) of b-node and p-node communications is used to register and resolve NetBIOS names. M-node first uses b-node; then, if necessary, p-node. M-node is typically not the best choice for larger networks because its preference for b-node broadcasts increases network traffic.

Hybrid —

–

A hybrid combination of b-node and p-node is used. When configured to use h-node, a

computer always tries p-node first and uses b-node only if p-node fails. This is the default.

•

SNTP Server —

•

Next Server —

Specifies the time server for the DHCP client.

Specifies the IP address of the next server in the boot process of a DHCP client. If the next server in the boot process is not configured, the DHCP Server uses inbound interface helper addresses as boot servers.

•

Next Server Name —

Specifies the name of the next server in the boot process. The server name may

contain up to 64 characters.

•

Image File Name —

Specifies the name of the file that is used as a boot image. The file name may

contain up to 128 characters.

Excluding Addresses

By default, the DHCP Server assumes that all pool addresses may be assigned to DHCP clients. The user can specify IP addresses that must not be used. These addresses are referred to as excluded addresses. A single IP address or a range of IP addresses can be excluded.

The Excluded Addresses page lists the excluded addresses. To open the Excluded Addresses page, click

System

→ DHCP Server → Excluded Addresses in the tree view.

Update with your book title 87

Figure 6-26. Excluded Addresses

•

Start IP Address —

•

End IP Address —

Adding an Excluded Address

Open the

Click

Excluded Addresses

Add

Displays the first IP address in the range of excluded IP addresses.

Displays the last IP address in the range of excluded IP addresses.

The Add Excluded page opens:

Figure 6-27. Add Excluded

page.

Define the relevant fields.

Click

Apply Changes

The address is excluded, and the device is updated.

Deleting Excluded Addresses

Open the

Check the

Click

Excluded Addresses

Remove

checkbox next to an address.

Apply Changes

page.

. The address is deleted, and the device is updated.

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Manually Allocating IP Addresses (Static Hosts)

The Static Hosts page is used to manually allocate IP addresses to network hosts. To open the Static Hosts page, click System

Figure 6-28. Static Hosts

→ DHCP Server → Static Hosts in the tree view.

•

Host Name —

Indicates the host pool name, which can be a string of symbols and an integer (for

example, piy4). The range is up to 32 characters.

•

IP Address —

•

Network Mask —

•

Prefix Length —

•

Client Identifier —

Specifies the IP address that was statically assigned to the host.

Specifies the pool’s network mask.

Specifies the number of bits that comprise the address prefix.

A unique identification of the client specified in dotted hexadecimal notation,

e.g., 01b6.0819.6811.72.

•

MAC Address —

•

Client Name —

Specifies the MAC Address of DHCP static host.

Specifies the name of the client, using a standard set of ASCII characters. The client

name must not include the domain name. The range is up to 32 characters.

•

Default Router —

•

Domain Name Server —

•

Domain Name —

Specifies the default router for the DHCP static host.

Specifies the DNS server available to the DHCP client.

Specifies the domain name for a DHCP static host. The domain name may contain

up to 32 characters.

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•

NetBIOS WINS Server —

Specifies the NetBIOS WINS name server available to a Microsoft DHCP

static host.

•

NetBIOS Node Type —

Informs the workstation how to resolve the NetBIOS name. Valid node types

are:

–

Blank —

–

Broadcast —

The workstation is not informed as to which type of NetBIOS node the client is.

IP broadcast messages are used to register and resolve NetBIOS names to IP

addresses.

–

Peer-to-Peer —

Point-to-point communications with a NetBIOS name server are used to register

and resolve computer names to IP addresses.

–

Mixed —

Hybrid —

–

A hybrid combination of b-node and p-node is used. When configured to use h-node, a

computer always tries p-node first and uses b-node only if p-node fails. This is the default.

•

SNTP Server —

•

Next Server —

Specifies the time server for the DHCP static host.

•

Next Server Name —

Specifies the name of the next server in the boot process. The server name may

contain up to 64 characters.

•

Image File Name —

Specifies the name of the file that is used as a boot image. The file name may

contain up to 128 characters.

Adding a new Static Host

Open the

Click

Static Hosts

Add

The Add Static Host page opens:

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page.

Figure 6-29. Add Static Host

Define the relevant fields.

Click

Apply Changes

The static host is added, and the device is updated.

Displaying Static Hosts Tables

Open the

Click

Static Hosts

Show All

page.

The Static Hosts Table page opens:

Figure 6-30. Static Hosts Table

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Deleting Static Hosts

Open the

Click

Static Hosts

Show All

page.

The Static Hosts Table page opens.

Check the

Click

Remove

checkbox next to a static host.

Apply Changes

. The host is deleted, and the device is updated.

Configuring Address Binding

The Address Binding page displays a list of the DHCP server’s allocated IP addresses and each IP address’s client identifier, lease expiration time, and allocation type. Open the Address Binding page, click System

Figure 6-31. Address Binding

→ DHCP Server → Address Binding in the tree view.

•

IP Address

•

Client Identifier

— Displays the IP addresses of the clients whose bindings are displayed.

— A unique identification of the client specified in dotted hexadecimal notation,

e.g., 01b6.0819.6811.72.

•

Lease Expiration

•

Ty p e

— Displays the manner in which the IP address was assigned to the host:

–

Static allocation

— Displays the lease expiration date and time of the host’s IP address.

— The network administrator maps the hardware address of a host to an IP

address on the DHCP server.

–

Permanent allocation

owned by a client permanently (unless changes in the network environment/connections take place, for any reason).

–

Dynamic allocation

The IP address is revoked at the end of this period and the switch must request another IP address.

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— An IP address received through a standard request-reply mechanism is

— A network device obtains a leased IP address for a specified period of time.

Defining Advanced Settings

The Advanced Settings page contains information for configuring general settings. Use Advanced Settings to set miscellaneous global attributes for the device. The changes to these attributes are applied only after the device is reset. To open the Advanced Settings page, click System the tree view.

Configuring General Device Parameters

The General Settings page provides information for defining general device parameters.To open the General Settings page, click System

Figure 6-32. General Settings

→ Advanced Settings → General in the tree view.

→ Advanced Settings in

•

Attribute

•

Current

•

After Reset

•

Jumbo Frames

transportation of identical data in fewer frames. This ensures less overhead, lower processing time, and fewer interrupts.

— The general setting attribute.

— The currently configured value.

— The future (after reset) value.

— Enables or disables the Jumbo Frames feature. Jumbo Frames enable the

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Configuring Device Switching

This section provides all system operation and general information for configuring network security, ports, Address tables, GARP, VLANs, Spanning Tree, Port Aggregation, and Multicast Support.

Configuring Network Security

The device enables network security through both Access Control Lists and Locked Ports.

Port Based Authentication (802.1x)

Port based authentication enables authenticating system users on a per-port basis via a external server. Only authenticated and approved system users can transmit and receive data. Ports are authenticated via the RADIUS server using the Extensible Authentication Protocol (EAP). Port Authentication includes:

•

Authenticators

•

Supplicants

services.

•

Authentication Server

performs the authentication on behalf of the authenticator, and indicates whether the user is authorized to access system services.

Port based authentication creates two access states:

•

Controlled Access

authorized.

•

Uncontrolled Access

The device currently supports Port Based Authentication via RADIUS servers.

— Specifies the port that is authenticated before permitting system access.

— Specifies host connected to the authenticated port requesting to access the system

— Specifies the external server, for example, the RADIUS server that

— Permits communication between the user and the system, if the user is

— Permits uncontrolled communication regardless of the port state.

Advanced Port Based Authentication

Advanced Port Based Authentication enables multiple hosts to be attached to a single port. Advanced Port Based Authentication requires only one host to be authorized for all hosts to have system access. If the port is unauthorized all attached hosts are denied access to the network.

Advanced Port Based Authentication also enables user based authentication. Specific VLANs in the device are always available, even if specific ports attached to the VLAN are unauthorized. For example, Voice over IP does not require authentication, while data traffic requires authentication. VLANs for which authorization is not required can be defined. Unauthenticated VLANs are available to users, even if the ports attached to the VLAN are defined as authorized.

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Advanced Port Based Authentication is implemented in the following modes:

•

Single Host Mode

•

Multiple Host Mode

access. Only one host must be authorized for all hosts to access the network. If the host authentication fails or an EAPOL-logoff message is received, all attached clients are denied network access.

•

Multiple Session Mode

•

Guest VLANs

access via port-based authorization, but the Guest VLAN is enabled, the port receives limited network access. For example, a network administrator can use Guest VLANs to deny network access via portbased authentication, but grant Internet access to unauthorized users.

To open the Network Security page select Switch → Network Security.

— Enables only the authorized host for single-session access to the port.

— Enables multiple hosts to be attached to a single port, for single-session

— Enables only the authorized host for multiple-session access to the port.

— Provides limited network access to unauthorized ports. If a port is denied network

Configuring Port Based Authentication

The Port Based Authentication page contains fields for configuring port based authentication and for enabling Guest VLANs. To open the Port Based Authentication page, click Switch → Network Security → Port Based Authentication.

Figure 7-1. Port Based Authentication

•

Port Based Authentication State

field values are:

–

Enable

— Enables port based authentication on the device.

–

Disable

•

Authentication Method

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— Disables port based authentication on the device.

— Permits port based authentication on the device. The possible

— The Authentication method used. The possible field values are:

–

None

— No authentication method is used to authenticate the port.

–

RADIUS

–

RADIUS, None

— Port authentication is performed using the RADIUS server.

— Port authentication is performed first using the RADIUS server. If the port is

not authenticated, then no authentication method is used, and the session is permitted.

•

Guest VLAN

— Specifies whether the Guest VLAN is enabled on the device. The possible field values

are:

–

Enable

— Enables using a Guest VLAN for unauthorized ports. If a Guest VLAN is enabled, the

unauthorized port automatically joins the VLAN selected in the VLAN List field.

–

Disable

•

VLAN List

•

Interface

•

User Name

•

Admin Interface Control

–

Auto

— Disables using a Guest VLAN for unauthorized ports. This is the default.

— When Guest VLAN is enabled, this field specifies which VLAN the guest will belong to.

— Contains an interface list.

— The user name as configured in the RADIUS server.

— Defines the port authorization state. The possible field values are:

— Enables port-based authentication on the device. The interface moves between an authorized or unauthorized state based on the authentication exchange between the device and the client.

–

ForceAuthorized

— Indicates the interface is in an authorized state without being authenticated.

The interface re-sends and receives normal traffic without client port-based authentication.

–

ForceUnauthorized

— Denies the selected interface system access by moving the interface into unauthorized state. The device cannot provide authentication services to the client through the interface.

•

Current Interface Control

• Authentication Type

–

802.1x Only

–

MAC Only

–

802.1x & MAC

— Sets the authentication type to 802.1x based authentication only.

— Sets the authentication type to MAC based authentication only.

— The currently configured port authorization state.

— Specifies the type of authentication on the port. The possible field values are:

— Sets the authentication type to 802.1x based authentication and MAC based

authentication.

•

Dynamic VLAN Assignment

— Indicates whether dynamic VLAN assignment is enabled for this port. This feature allows network administrators to automatically assign users to VLANs during the RADIUS server authentication. When a user is authenticated by the RADIUS server, the user is automatically joined to the VLAN configured on the RADIUS server.

– Port Lock and Port Monitor should be disabled when DVA is enabled.

– Dynamic VLAN Assignment (DVA) can occur only if a RADIUS server is configured, and port

authentication is enabled and set to 802.1x multi-session mode.

– If the Radius Accept Message doesn’t contain the supplicant’s VLAN, the supplicant is rejected.

– Authenticated ports are added to the supplicant VLAN as untagged.

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– Authenticated ports remain unauthenticated VLAN and Guest VLAN members. Static VLAN

configuration is not applied to the port.

– The following list of VLANs cannot participate in DVA: an Unauthenticated VLAN, a Dynamic

VLAN that was created by GVRP, a Voice VLAN, a Default VLAN and a Guest VLAN.

– Network administrators can delete the supplicant VLAN while the supplicant is logged in. The

supplicant is authorized during the next re-authentication if this supplicant VLAN is re-created or a new VLAN is configured on the RADIUS server.

•

Guest VLAN

•

Periodic Reauthentication

reauthentication period is defined in the

•

Reauthentication Period (300-4294967295)

— Specifies whether the Guest VLAN is enabled on the interface.

— Reauthenticates the selected port periodically, when enabled. The

Reauthentication Period (300-4294967295) field.

— Indicate the time span in which the selected port is

reauthenticated. The field value is in seconds. The field default is 3600 seconds.

•

Reauthenticate Now

•

Authentication Server Timeout (1-65535)

— Permits immediate port reauthentication, when selected.

— Defines the amount of time that lapses before the device resends a request to the authentication server. The field value is in seconds. The field default is 30 seconds.

•

Resending EAP Identity Request (30-65535)

— Defines the amount of time that lapses before EAP

request are resent. The field default is 30 seconds.

•

Quiet Period (0-65535)

— The number of seconds that the device remains in the quiet state following

a failed authentication exchange. The possible field range is 0-65535. The field default is 60 seconds.

•

Supplicant Timeout (1-65535)

— The amount of time that lapses before EAP requests are resent to

the user. The field value is in seconds. The field default is 30 seconds.

•

Max EAP Requests (1-10)

— The total amount of EAP requests sent. If a response is not received after

the defined period, the authentication process is restarted. The field default is 2 retries.

Displaying the Port Based Authentication Table

Display the

Click

The

Port Based Authentication

Show All

Port Based Authentication Table

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page.

opens:

Figure 7-2. Port Based Authentication Table

Termination Cause — The reason for which the port authentication was terminated.

Copy To Checkbox — Copies port parameters from one port to the selected ports.

Select All — Selects all ports in the Port Based Authentication Table.

Copying Parameters in the Port Based Authentication Table

Open the

Click

The

Select the interface in the

Select an interface in the

Select the

Port Based Authentication page.

Show All

Port Based Authentication Table

opens.

Copy Parameters from

Port Based Authentication Table

field.

Copy to check box to define the interfaces to which the Port based authentication

parameters are copied.

Click

Apply Changes

The parameters are copied to the selected port in the

Port Based Authentication Table

is updated.

, and the device

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Configuring Advanced Port Based Authentication

The Multiple Hosts page provides information for defining advanced port based authentication settings for specific ports. To open the Multiple Hosts, click Switch →Network Security → Multiple Hosts.

Figure 7-3. Multiple Hosts

•

Port

— The port number for which Advanced Port Based Authentication is enabled.

• Host Authentication

–Single

–

•

Action on Single Host Violation

mode, from a host whose MAC address is not the client (supplicant) MAC address. The

Single Host Violation

possible field values are:

–

•

Tr ap s

— Enables a single authorized host for single-session access to the system.

Multiple Host

system.

Multiple Session

Forward

learned.

Discard

Shutdown

locked until they are activated, or the device is reset.

— Enables or disables sending traps to the host if a violation occurs.

— Forwards the packets from an unknown source, however, the MAC address is not

— Discards the packets from any unlearned source. This is the default value.

— Defines the host authentication type. The possible fields are:

— Enables a single host to authorize multiple hosts for single-session access to the

— Enables a single authorized host for multiple-session access to the system.

— Defines the action to be applied to packets arriving in single-host

Action on

field can be defined only if the

— Discards the packet from any unlearned source and locks the port. Ports remain

Multiple Hosts

field is defined as

Disable

. The

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Dell 28xx User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Introduction

System Description

PowerConnect 2808

PowerConnect 2816

PowerConnect 2824

PowerConnect 2848

Summary of PowerConnect Models

Features

General Features

MAC Address Supported Features

Layer 2 Features

VLAN Supported Features

Spanning Tree Protocol Features

Class of Service (CoS) Features

Ethernet Switch Management Features

Hardware Description

Switch Port Configurations

PowerConnect 28xx Front and Back Panel Port Description

Physical Dimensions

LED Definitions

Power LED

Managed Mode LED

Fan LED (2824/2848 only)

Port LEDs

Managed Mode Button

Switch Ventilation Fan

Cables, Port Connections, and Pinout Information

1000BASE-T Cable Requirements

RJ-45 Connections for 10/100/1000BASE-T Ports

SFP Ports

Power Connectors

Internal Power Supply Connector

Installing the PowerConnect Device

Installation Precautions

Site Requirements

Unpacking

Package Contents

Unpacking the Device

Mounting the Device

Overview

Device Rack Installation

Installing on a Flat Surface

Installing on a Wall

Connecting the Device

Connecting the Device to the Network

Connecting the Terminal to the Device

Connecting a Device to a Power Supply

Port Connections, Cables, and Pinout Information

RJ-45 Connections for 10/100/1000BaseT Ports

Port Default Settings

Auto-Negotiation

MDI/MDIX

Flow Control

Back Pressure

Switching Port Default Settings

Starting and Configuring the Device

Booting the Device - Managed Mode

Initial Configuration - Managed Mode

Advanced Configuration

Retrieving an IP Address From a DHCP Server

Startup Procedures

Startup Menu Procedures

Software Download

Erase FLASH File

Erasing the Device Configuration

Password Recovery

Software Download Through TFTP Server

Management Modes

Default Values

Transitioning Between Modes

Returning to Managed Mode

Using Dell OpenManage Switch Administrator

Understanding the Interface

Device Representation

Using the Switch Administrator Buttons