Dell PowerConnect 2816 User Manual

Name: Dell PowerConnect 2816
Brand: Dell
SKU: 1946509
Rating: 4 (1 reviews)

4 (1)

Dell™ PowerConnect™

28xx Systems

User Guide

w w w . d e l l . c o m | s u p p o r t . d e l l . c o m

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.

March 4, 2012

Rev. A04

1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
PowerConnect 2808 . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
PowerConnect 2816 . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
PowerConnect 2824 . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
PowerConnect 2848 . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
Summary of PowerConnect Models . . . . . . . . . . . . . . . . . . .	11
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
General Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
MAC Address Supported Features . . . . . . . . . . . . . . . . . . . .	13
Layer 2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
VLAN Supported Features. . . . . . . . . . . . . . . . . . . . . . . .	14
Spanning Tree Protocol Features . . . . . . . . . . . . . . . . . . . . .	15
Class of Service (CoS) Features . . . . . . . . . . . . . . . . . . . . .	16
Ethernet Switch Management Features. . . . . . . . . . . . . . . . . .	16

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

Switch Port Configurations . . . . . . . . . . . . . . . . . . . . . . . . . .	17
PowerConnect 28xx Front and Back Panel Port Description . . . . . . .	17
Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	21
LED Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	21
Power LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	22
Managed Mode LED. . . . . . . . . . . . . . . . . . . . . . . . . . .	22
Fan LED (2824/2848 only) . . . . . . . . . . . . . . . . . . . . . . .	22
Port LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	22
Managed Mode Button. . . . . . . . . . . . . . . . . . . . . . . . . .	23
Switch Ventilation Fan . . . . . . . . . . . . . . . . . . . . . . . . . .	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

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

Internal Power Supply Connector . . . . . . . . . . . . . . . . . . . . 26

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

Installation Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27
Site Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
Package Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
Unpacking the Device . . . . . . . . . . . . . . . . . . . . . . . . . .	28
Mounting the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29
Device Rack Installation . . . . . . . . . . . . . . . . . . . . . . . . .	29
Installing on a Flat Surface. . . . . . . . . . . . . . . . . . . . . . . .	30
Installing on a Wall . . . . . . . . . . . . . . . . . . . . . . . . . . .	31
Connecting the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . .	33
Connecting the Device to the Network . . . . . . . . . . . . . . . . . . . .	33
Connecting the Terminal to the Device . . . . . . . . . . . . . . . . . . . .	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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	37
Auto-Negotiation . . . . . . . . . . . . . . . . . . . . . . . . . . . .	37
MDI/MDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	37
Flow Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	37
Back Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	37
Switching Port Default Settings . . . . . . . . . . . . . . . . . . . . .	38

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

Management Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Transitioning Between Modes. . . . . . . . . . . . . . . . . . . . . . . . . 42

Booting the Device - Managed Mode . . . . . . . . . . . . . . . . . . . . . 44

Initial Configuration Through the Set-up Wizard . . . . . . . . . . . . . . . 44

Initial Configuration Through the Web . . . . . . . . . . . . . . . . . . . .	48
Basic Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . .	48
Retrieving an IP Address From a DHCP Server . . . . . . . . . . . . .	49
Startup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	50
Software Download . . . . . . . . . . . . . . . . . . . . . . . . . . .	51
Erase FLASH File . . . . . . . . . . . . . . . . . . . . . . . . . . . .	51
Erasing the Device Configuration . . . . . . . . . . . . . . . . . . . .	51
Password Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . .	52
Software Download Through TFTP Server . . . . . . . . . . . . . . .	52
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	53

5 Using Dell OpenManage Switch Administrator. . . . . . . 54

Understanding the Interface . . . . . . . . . . . . . . . . . . . . . . . . . .	54
Using the Switch Administrator Buttons . . . . . . . . . . . . . . . . . . .	55
Information Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . .	55
Device Management Buttons . . . . . . . . . . . . . . . . . . . . . .	56
Starting the Application . . . . . . . . . . . . . . . . . . . . . . . . . . . .	56
Access Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	56

6 Configuring System Information. . . . . . . . . . . . . . . . . 58

Defining General Device Information . . . . . . . . . . . . . . . . . . . . .	58
Viewing Device Information . . . . . . . . . . . . . . . . . . . . . . .	58
Viewing the Versions Page . . . . . . . . . . . . . . . . . . . . . . . .	60
Resetting the Device . . . . . . . . . . . . . . . . . . . . . . . . . . .	61
Entering Secure Mode . . . . . . . . . . . . . . . . . . . . . . . . . .	62
Defining Device IP Addresses . . . . . . . . . . . . . . . . . . . . . . . .	63
Defining IP Interface Parameters. . . . . . . . . . . . . . . . . . . . .	63
Running Cable Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . .	64
Viewing Copper Cable Diagnostics . . . . . . . . . . . . . . . . . . .	64
Viewing Optical Transceiver Diagnostics . . . . . . . . . . . . . . . .	65
Managing Device Security . . . . . . . . . . . . . . . . . . . . . . . . . .	68
Defining the Local User Databases. . . . . . . . . . . . . . . . . . . .	68
Configuring RADIUS Global Parameters . . . . . . . . . . . . . . . .	70

Defining SNMP Parameters. . . . . . . . . . . . . . . . . . . . . . . . . .	73
Defining SNMP Global Parameters . . . . . . . . . . . . . . . . . . .	74
Defining Communities . . . . . . . . . . . . . . . . . . . . . . . . . .	75
Defining SNMP Notification Recipients . . . . . . . . . . . . . . . . .	77
Managing Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	79
Downloading Files . . . . . . . . . . . . . . . . . . . . . . . . . . . .	79
Uploading Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	81
Restoring Default Settings . . . . . . . . . . . . . . . . . . . . . . . .	82
Defining DHCP Server Settings. . . . . . . . . . . . . . . . . . . . . . . .	83
Configuring DHCP Properties . . . . . . . . . . . . . . . . . . . . . .	83
Defining Network Pool . . . . . . . . . . . . . . . . . . . . . . . . .	85
Excluding Addresses. . . . . . . . . . . . . . . . . . . . . . . . . . .	86
Manually Allocating IP Addresses (Static Hosts) . . . . . . . . . . . .	88
Address Binding . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	91
Defining Advanced Settings . . . . . . . . . . . . . . . . . . . . . . . . .	92
Configuring General Device Parameters . . . . . . . . . . . . . . . . .	92

7 Configuring Device Switching . . . . . . . . . . . . . . . . . .	93
Configuring Network Security . . . . . . . . . . . . . . . . . . . . . . . .	93
Configuring Port Based Authentication . . . . . . . . . . . . . . . . .	94
Configuring Advanced Port Based Authentication . . . . . . . . . . . .	97
Authenticating Users. . . . . . . . . . . . . . . . . . . . . . . . . . .	99
Configuring Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	101
Defining Port Parameters . . . . . . . . . . . . . . . . . . . . . . .	101
Aggregating Ports . . . . . . . . . . . . . . . . . . . . . . . . . . .	103
Configuring Green Ethernet . . . . . . . . . . . . . . . . . . . . . .	106
Enabling Storm Control . . . . . . . . . . . . . . . . . . . . . . . .	108
Defining Port Mirroring Sessions . . . . . . . . . . . . . . . . . . .	110
Configuring Address Tables. . . . . . . . . . . . . . . . . . . . . . . . .	112
Viewing Dynamic Addresses. . . . . . . . . . . . . . . . . . . . . .	112
Configuring the Spanning Tree Protocol . . . . . . . . . . . . . . . . . .	114
Defining STP Global Settings . . . . . . . . . . . . . . . . . . . . .	114
Defining STP Port Settings . . . . . . . . . . . . . . . . . . . . . .	117
Defining STP LAG Settings . . . . . . . . . . . . . . . . . . . . . .	120
Configuring Rapid Spanning Tree . . . . . . . . . . . . . . . . . . .	122

	Configuring VLANs . . . . . . . . . . . . . . . . . . . . . . . . . . . .	124
	Defining VLAN Members . . . . . . . . . . . . . . . . . . . . . . .	124
	VLAN Port Membership Table . . . . . . . . . . . . . . . . . . . .	126
	Defining VLAN Ports Settings. . . . . . . . . . . . . . . . . . . . .	128
	Defining VLAN LAG Settings. . . . . . . . . . . . . . . . . . . . .	129
	Aggregating Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	131
	Defining LAG Membership . . . . . . . . . . . . . . . . . . . . . .	132
	Multicast Forwarding Support . . . . . . . . . . . . . . . . . . . . . . .	132
	Defining Multicast Global Parameters . . . . . . . . . . . . . . . . .	133
	Adding Bridge Multicast Address Members . . . . . . . . . . . . . .	134
	Assigning Multicast Forward All Parameters . . . . . . . . . . . . .	136
	IGMP Snooping . . . . . . . . . . . . . . . . . . . . . . . . . . . .	139
8	Viewing Statistics. . . . . . . . . . . . . . . . . . . . . . . . . .	141
	Viewing RMON Statistics. . . . . . . . . . . . . . . . . . . . . . . . . .	141
	Viewing RMON Statistics Group . . . . . . . . . . . . . . . . . . .	141
	Viewing Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	142
	Viewing the CPU Utilization. . . . . . . . . . . . . . . . . . . . . .	142
9	Configuring Quality of Service. . . . . . . . . . . . . . . . .	144
	Defining CoS Global Parameters . . . . . . . . . . . . . . . . . . . . . .	146
	Defining CoS Settings . . . . . . . . . . . . . . . . . . . . . . . . . . .	146
	Defining QoS Interface Settings. . . . . . . . . . . . . . . . . . . . . . .	147
	Defining Queue Settings . . . . . . . . . . . . . . . . . . . . . . . . . .	148
	Mapping CoS Values to Queues. . . . . . . . . . . . . . . . . . . . . . .	150
	Mapping DSCP Values to Queues. . . . . . . . . . . . . . . . . . . . . .	151
A	Managing the Device Using the CLI . . . . . . . . . . . . .	153
	Accessing the Device Through the CLI . . . . . . . . . . . . . . . . . . .	153
	Console Connection . . . . . . . . . . . . . . . . . . . . . . . . . .	153
	Telnet Connection . . . . . . . . . . . . . . . . . . . . . . . . . . .	153

Using the CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	154
Command Mode Overview . . . . . . . . . . . . . . . . . . . . . .	154
User EXEC Mode . . . . . . . . . . . . . . . . . . . . . . . . . . .	154
Privileged EXEC Mode . . . . . . . . . . . . . . . . . . . . . . . .	155
Global Configuration Mode . . . . . . . . . . . . . . . . . . . . . .	155
Interface Configuration Mode . . . . . . . . . . . . . . . . . . . . .	156
CLI Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	157
Command: copy . . . . . . . . . . . . . . . . . . . . . . . . . . . .	157
Command: debug-mode . . . . . . . . . . . . . . . . . . . . . . . .	158
Command: do . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	158
Command: end. . . . . . . . . . . . . . . . . . . . . . . . . . . . .	159
Command: exit (configuration) . . . . . . . . . . . . . . . . . . . .	159
Command: exit (EXEC) . . . . . . . . . . . . . . . . . . . . . . . .	160
Command: help . . . . . . . . . . . . . . . . . . . . . . . . . . . .	160
Command: interface ethernet . . . . . . . . . . . . . . . . . . . . .	160
Command: interface port-channel . . . . . . . . . . . . . . . . . . .	161
Command: interface vlan . . . . . . . . . . . . . . . . . . . . . . .	161
Command: ip address . . . . . . . . . . . . . . . . . . . . . . . . .	162
Command: ping . . . . . . . . . . . . . . . . . . . . . . . . . . . .	163
Command: show tech-support command. . . . . . . . . . . . . . . .	165
Command: snmp-server community . . . . . . . . . . . . . . . . . .	166
Command: username. . . . . . . . . . . . . . . . . . . . . . . . . .	167
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	169
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	179

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/	Optical Ports/	RS232 serial port -	Fans
	RJ-45 Connectors	GbE	baud rate is 9600 bps

PowerConnect 2808	8 built-in 10/100/1000 Base-T ports	none
PowerConnect 2816	16 built-in 10/100/1000 Base-T ports	none
PowerConnect 2824	24 built-in 10/100/1000 Base-T ports	2 SFP (combo)
PowerConnect 2848	48 built-in 10/100/1000 Base-T ports	4 SFP (combo)

Internal console port	none
External console port	none
External console port	1
External console port	32

Features

General Features

Management Modes

The device supports the following modes:

•Managed Mode — Provides switch management through the web interface.

•Unmanaged Mode — In this mode, the device operates as a hub with default configuration, and configuration cannot be changed.

•Secure Mode — This mode keeps the existing configuration active, but it prevents users from making 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.

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 point- to-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 standard 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 — Reduction of power over Ethernet cables shorter than 40m.

IGMP Snooping

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 eight aggregated links. Each of the eight aggregated links may be defined with up to eight 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.

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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

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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.

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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.

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.

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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.

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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

1TxRx 1+

2TxRx 1-

3TxRx 2+

4TxRx 2-

5TxRx 3+

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

Pin No Function

6TxRx 3-

7TxRx 4+

8TxRx 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

1Transmitter ground (common with receiver ground)

2Transmitter fault

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

4Module definition 2; data line for serial ID.

5Module definition 1; clock line for serial ID.

6Module definition 0; grounded within the module.

7Rate select; no connection required.

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

9Receiver ground (common with transmitter ground)

10Receiver ground (common with transmitter ground)

11Receiver ground (common with transmitter ground)

12Receiver inverted data out; AC coupled.

13Receiver non-inverted data out; AC coupled.

14Receiver ground (common with transmitter ground)

Dell PowerConnect 28xx Systems User Guide		25

Table 2-8. SFP Pin Connections

Pin No Use

15Receiver power supply

16Transmitter power supply

17Transmitter ground (common with receiver ground)

18Transmitter non-inverted data in

19Transmitter inverted data in

20Transmitter 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.

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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 included in the Dell Documentation.

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.

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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 — Ensure that the power supply is correctly installed.

•Clearance — There is adequate frontal clearance for operator access. Allow clearance for cabling, power connections, and ventilation.

•Cabling — Cabling is routed to avoid sources of electrical noise such as radio transmitters, broadcast amplifiers, power lines, and fluorescent lighting fixtures.

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

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

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.

1Place the box on a clean flat surface.

2Open the box or remove the box top.

3Carefully remove the device from the package and place it on a secure, stable and clean surface.

4Remove all packing material.

28 Dell PowerConnect 28xx Systems User Guide

5 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:

1Place 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

2Insert the supplied screws into the rack mounting holes and tighten with a screwdriver.

3Repeat the process for the rack-mounting bracket on the other side of the device.

4Insert the device into the rack, ensuring the rack-mounting holes on the device line up to the mounting hole on the rack.

5Secure 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.

1Attach the self-adhesive rubber pads (provided with the device) on each marked location on the bottom of the chassis.

2Set 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.

3Ensure that the device has proper ventilation.

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