HP 2920 Series User manual

Power over Ethernet
HP 2920 Switches
Installation and Getting Started Guide

HP 2920 Switches
Installation and Getting Started Guide

Hewlett-Packard Company
8000 Foothills Boulevard, m/s 5551
Roseville, California 95747-5551
http://www.hp.com/networking
© Copyright 2013 Hewlett-Packard Development Company, L.P.
The information contained herein is subject to change without
notice.
This document contains proprietary information, which is
protected by copyright. No part of this document may be
photocopied, reproduced, or translated into another
language without prior written consent of Hewlett-Packard..
Publication Number
5998-3582
February 2013
Applicable Products
Trademark Credits
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trademarks of Microsoft Corporation.
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Warranty
For HP warranty information, visit
http://h17007.www1.hp.com/us/en/support/warranty/
index.aspx
A copy of the specific warranty terms applicable to your
Hewlett-Packard products and replacement parts can be
obtained from your HP Sales and Service Office or
authorized dealer.
Safety
Before installing or operating these products, read the
“Installation Precautions” in chapter 2, the safety and
regulatory information in the appendices, and any safety and
regulatory information included with your product.
HP 2920-24G Switch J9726A
HP 2920-24G-PoE+ Switch J9727A
HP 2920-48G Switch J9728A
HP 2920-48G-PoE+ Switch J9729A
HP 2920 2-Port 10GbE SFP+ Module J9731A
HP 2920 2-Port 10GBASE-T Module J9732A
HP 2920 2-Port Stacking Module J9733A
HP 2920 0.5m Stacking Cable J9734A
HP 2920 1m Stacking Cable J9735A
HP 2920 3m Stacking Cable J9736A
HP X331 165W 100-240VAC to 12VDC PS J9739A
HP X332 575W 100-240VAC to 54VDC PS J9738A
HP X410 E-Series 1U Universal Rack Mounting Kit J9583A

1
Contents
1 Introducing the HP 2920 Switches
Fronts of the Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
PoE/PoE+ Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Non-PoE Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Network Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Management Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Console Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Out-of-Band Management (OOBM) Port . . . . . . . . . . . . . . . . . . . . . 1-6
Auxiliary (Aux) Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Switch and Port LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
LED Mode Select Button and Indicator LEDs . . . . . . . . . . . . . . . . . . . 1-11
Reset and Clear Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Backs of the Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Power Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
10G Expansion Module Slots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Stacking Module Slot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
HP 2920 10G Expansion Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
10G Expansion Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
10G Expansion Module LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
HP 2920 Stacking Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Stacking Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Stacking Module LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Switch Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
2 Installing the Switch
Included Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2
Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Installation Precautions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
1. Prepare the Installation Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2. Verify the Switch Boots Correctly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
LED Behavior: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
3. (Optional) Install 10G Expansion Modules . . . . . . . . . . . . . . . . . . . . 2-8
Verifying the Module is Installed Correctly . . . . . . . . . . . . . . . . . . 2-9
4. (Optional) Install the Stacking Module . . . . . . . . . . . . . . . . . . . . . . 2-10
Verifying the Module is Installed Correctly . . . . . . . . . . . . . . . . . 2-10
5. Mount the Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Rack or Cabinet Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Rack Mounting the HP 2920 switch in a 2-post rack . . . . . . . . . . 2-12
Rack Mounting the HP 2920 switch in a 4-post rack . . . . . . . . . . 2-14
Horizontal Surface Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
6. (Optional) Install Stacking Cables . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
7. (Optional) Install Transceivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Installing a transceiver: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Removing a transceiver: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
8. Connect the Switch to a Power Source . . . . . . . . . . . . . . . . . . . . . . 2-18
PoE/PoE+ Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
9. Connect the Network Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Using the RJ-45 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Connecting Cables to Transceivers . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Connecting a fiber cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
10. (Optional) Connect a Management Console . . . . . . . . . . . . . . . . . 2-20
Configuring the Management Console Connection . . . . . . . . . . . 2-22
Setting Up a Console Connection . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Console Cable Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
Stacking Information and Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25
Chain Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
Ring Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27
Sample Network Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

3
3 Getting Started With Switch Configuration
Recommended Minimal Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Minimal Configuration Through the Console Port Connection . . . 3-2
Where to Go From Here: Networked Connections . . . . . . . . . . . . . . . 3-4
Using the IP Address for Remote Switch Management . . . . . . . . . . . 3-6
Starting a Telnet Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Starting a Web Browser Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
4 Replacing Components
Replacing the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Replacing a 10G Expansion Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Replacing the Stacking Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
5 Troubleshooting
Basic Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Diagnosing with the LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Proactive Networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Hardware Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Testing the Switch by Resetting It . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Checking the Switch LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Checking Console Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Testing Twisted-Pair Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
Testing Switch-to-Device Network Communications . . . . . . . . . . . . 5-13
Testing End-to-End Network Communications . . . . . . . . . . . . . . . . . 5-13
Restoring the Factory Default Configuration . . . . . . . . . . . . . . . . . . 5-14
Downloading New Switch Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
HP Customer Support Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Before Calling Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15

4
A Specifications
Switch Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Connectivity Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
10G Expansion Modules Specifications . . . . . . . . . . . . . . . . . . . . . . . . A-4
Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Stacking Module Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
B Cabling and Technology Information
Cabling Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Technology Distance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Mode Conditioning Patch Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
Installing the Patch Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5
Twisted-Pair Cable/Connector Pin-Outs . . . . . . . . . . . . . . . . . . . . . . . B-6
Straight-Through Twisted-Pair Cable for 10 Mbps or 100 Mbps Network
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
Cable Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
Crossover Twisted-Pair Cable for 10 Mbps or 100 Mbps Network
Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8
Cable Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8
Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8
Straight-Through Twisted-Pair Cable for 1000 Mbps Network
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-9
Cable Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-9
Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-9

1-1
1
Introducing the HP 2920 Switches
The HP 2920 switches are multi-port switches that can be used to build high-
performance switched networks. These switches are store-and-forward
devices offering low latency for high-speed networking. The HP 2920 switches
also support a field-replaceable power supply, Power over Ethernet (PoE/
PoE+) technologies, and full network management capabilities.
In addition, the HP 2920 switches support the HP 2920 Stacking Technology
feature for stacking the switches. When 2920 Stacking Modules (J9733A) are
installed in the switches, any combination of up to four HP 2920 switches can
be stacked together via high-speed backplane cables to form a single extended
virtual switch. See “Stacking Information and Topologies” on page 2-25, and
the Advanced Traffic Management Guide for more stacking information.
These switches are described in this manual:
This chapter describes these switches with the following information:
■Fronts of the switches:
• Network Ports
• Management Ports
•LEDs
• Buttons
■Backs of the switches:
• Power Supplies and Power Connectors
• HP 2920 10G Modules
• HP 2920 Stacking Module
■Switch Features
Non-PoE Switches PoE+ Switches
HP 2920-24G Switch (J9726A) HP 2920-24G-PoE+ Switch (J9727A)
HP 2920-48G Switch (J9728A) HP 2920-48G-PoE+ Switch (J9729A)

1-2
Introducing the HP 2920 Switches
Fronts of the Switches
Fronts of the Switches
PoE/PoE+ Switches
Figure 1-1. Front of the HP 2920-24G-PoE+ Switch
Figure 1-2. Front of the HP 2920-48G-PoE+ Switch
➋➍
➑
➎
➒
➌
➓
➊ ➏
➏➐
➊Power, Fault, and Locator LEDs ➐PoE, Tmp (Temperature), Test, Fan, and Aux
(Auxiliary) port status LED
➋LED Mode button and indicator LEDs ➑Reset and Clear buttons
➌Status LEDs for components on the back of the
switch
➒Aux port and Out-of-Band Management port
➍Stacking status LEDs ➓10/100/1000BASE-T PoE+ RJ-45 ports
➎Switch port LEDs Dual-Personality (10/100/1000BASE-T or SFP)
ports
➏Console ports
➊➏➋➌➍➎
➏➐➑
➒
➓

1-3
Introducing the HP 2920 Switches
Fronts of the Switches
Non-PoE Switches
Figure 1-3. Front of the HP 2920-24G Switch
Figure 1-4. Front of the HP 2920-48G Switch
➋➍
➑
➎
➒
➌
➓
➊➏
➏➐
➊Power, Fault, and Locator LEDs ➐Tmp (Temperature), Test, Fan, and Aux
(Auxiliary) port status LED
➋LED Mode button and indicator LEDs ➑Reset and Clear buttons
➌Status LEDs for components on the back of the
switch
➒Aux port and Out-of-Band Management port
➍Stacking status LEDs ➓10/100/1000BASE-T RJ-45 ports
➎Switch port LEDs Dual-Personality (10/100/1000BASE-T or SFP)
ports
➏Console ports
➊➏➋➌➍➎
➏➐➑
➒
➓

1-4
Introducing the HP 2920 Switches
Fronts of the Switches
Network Ports
Dual-Personality Port Operation. By default, the RJ-45 connectors are
enabled. If an SFP transceiver is installed in a slot, it is enabled and the
associated RJ-45 connector is disabled and cannot be used. If the SFP is
removed, the associated RJ-45 port is automatically re-enabled.
On the PoE/PoE+ switches, the RJ-45 connector also supplies PoE/PoE+
power until an SFP is installed. The PoE+ power is turned off when an SFP is
installed.
These products also support the optional network connectivity shown in Table
1-2.
Table 1-1. Network Ports
Model name
10/100/1000
non-PoE
RJ-45 ports1
10/100/1000
PoE/PoE+
RJ-45 ports1
1G SFP
ports2SFP+ ports310GBASE-T RJ-45 ports1
HP 2920-24G-PoE+ Switch 20 4
HP 2920-48G-PoE+ Switch 44 4
HP 2920-24G Switch 20 4
HP 2920-48G Switch 44 4
HP 2920-2-port 10G SFP+ Module 2
HP 2920-2-port 10G BASE-T Module 2
Notes:
1All RJ-45 ports support “Auto-MDIX”, which means you can use either straight-through or crossover twisted-pair
cables to connect network devices to the switch. On each switch, two of the 10/100/1000BASE-T ports are provided
in the dual-personality ports.
2SFP ports are included in the dual-personality ports. The SFP ports support 1G SFP transceivers. J9584A SFP ports
also support 100 Mb (100-FX and 100-BX) transceivers.
3 SFP+ ports are provides on the HP 2920 2-Port 10-GbE SFP+ Module. They support 1G SFP and 10G SFP+
transceivers.

1-5
Introducing the HP 2920 Switches
Fronts of the Switches
Table 1-2. Optional Network Connectivity, Speeds and Technologies
Transceiver Form-Factor and Connector1
Speed Technology Cabling SFP
Connector
SFP+
Connector
100 Mbps
100-FX Fiber (multimode) LC
100-BX Fiber (single mode) LC
1 Gbps
1000-T Copper (twisted-pair) RJ-45
1000-SX Fiber (multimode) LC
1000-LX Fiber (multimode or single mode) LC
1000-LH Fiber (single mode) LC
1000-BX Fiber (single mode) LC
10 Gbps
10-Gig
Direct Attach
Copper (twinaxial) Not
Applicable
10-Gig SR Fiber (multimode) LC
10-Gig LRM Fiber (multimode) LC
10-Gig LR Fiber (single mode) LC
10-Gig ER Fiber (single mode) LC
1For supported transceivers, visit www.hp.com/networking/support.
– In the first textbox, type J4858 (for 100-Mb and Gigabit information), or J8436 (for 10-Gigabit information).
– Select any of the products that display in the dropdown list.
– Select Product support information. Then click on Manuals and find the Transceiver Support Matrix.
For technical details of cabling and technologies see “Cabling and Technology Information” in the appendices.

1-6
Introducing the HP 2920 Switches
Fronts of the Switches
Management Ports
Console Port
This port is used to connect a console to the switch by using the RJ-45 to DB9
cable supplied with the switch. This connection is described under “10.
(Optional) Connect a Management Console” on page 2-20 in chapter 2,
“Installing the Switch.” The console can be a PC or workstation running a VT-
100 terminal emulator, or a VT-100 terminal.
You can also connect a console to the switch using the Micro USB console
port (cable not provided). Use a USB 2.0 high-speed cable with male type A
(4-pin) to male micro-B (5-pin) connectors. The maximum allowable length is
5 meters.
Out-of-Band Management (OOBM) Port
This RJ-45 port is used to connect a dedicated management network to the
switch.
Auxiliary (Aux) Port
An auxiliary port for processing a USB command file or downloading switch
software code. This port uses a USB 1.1 connector.
Switch and Port LEDs
■Table 1-3 describes the switch and port LEDs and their operation for
standalone HP 2920 switches.
■Table 1-4 describes the operation of the LEDs when the switches are
stacked. It includes descriptions of all stacking-related LEDs including
those for Stacking Module Status and Stacking Status.

1-7
Introducing the HP 2920 Switches
Fronts of the Switches
Table 1-3. Standalone Switch and Port LED Behavior
Switch LEDs State Meaning
Power
(green)
On
Off
The switch is receiving power.
The switch is NOT receiving power.
Fault
(orange)
Off The normal state; indicates there are no fault conditions on the switch.
Blink
orange*
A fault has occurred on the switch, one of the switch ports, a module in the rear of the
switch, or the fan. The Status LED for the component with the fault will blink
simultaneously.
On On briefly after the switch is powered on or reset, at the beginning of switch self test.
If this LED is on for a prolonged time, the switch has encountered a fatal hardware
failure, or has failed its self test. See chapter 4, “Troubleshooting” for more information.
Locator
(blue)
On
Blinking
Off
The Locator LED is used to help you identify a specific in your network equipment
installation. The LED can be set to be on solid or to blink, and for a specified number of
minutes (1-1440). The default is 30 minutes. Use the command “chassislocate” to
control this LED.
Test
(green/
orange)
Off The normal operational state; the switch is not undergoing self test.
On The switch self test and initialization are in progress after the switch has been power
cycled or reset. The switch is not operational until this LED goes off. The Self Test LED
also comes on briefly when you “hot swap” a mini-GBIC into the switch; the mini-GBIC
is self tested when it is hot swapped.
Blink
orange*
A component of the switch has failed its self test. The status LED for that component,
for example the Fan LED, and the switch Fault LED will blink simultaneously.
Port LEDs
(green/
orange- Link
and Mode)
Link For non-PoE or PoE-disabled ports:
Displays port link information:
• On – The port is enabled and receiving a link indication from the connected device.
• Off – The port has no active network cable connected, or is not receiving link beat
or sufficient light (fiber-optic port). Otherwise, the port may have been disabled
through the switch console, the web browser interface, or network management.
• Blinking orange*– The corresponding port has failed its self test. Blinks simultane-
ously with the switch Fault LED.
For PoE-enabled ports, see the LED mode information for PoE mode below.
Mode The operation of the port Mode LED is controlled by the LED Mode select button, and
the current setting is indicated by the LED Mode indicator LEDs near the button. Press
the button to step from one view mode to the next. The default view is Activity (Act).
If the Save Power LED feature has been enabled on the switch (savepower led
command), then that becomes the default view - all port LEDs are Off when the switch
is operating according to that feature.

1-8
Introducing the HP 2920 Switches
Fronts of the Switches
LED Mode
Indicators
(green)
Act Indicates the port LEDs are displaying network activity information.
FDx Indicates port Mode LEDs are lit for ports in Full Duplex Mode. Off indicates half duplex.
Spd Indicates the port Mode LEDs are displaying the connection speed at which each port
is operating. Each port Mode LED then indicates one of the following:
• Off – the port is operating at 10 Mbps.
• Blinking** – the port is operating at 100 Mbps.
• On – the port is operating at 1000 Mbps.
PoE‡Indicates that the port Link and Mode LEDs are displaying PoE information as follows:
• Link On – PoE is enabled on the port.
• Link Off – PoE is disabled on the port.
• Link Blink orange** – the port has an error or the port is denied power due to
insufficient power.
• Mode On – the port is providing PoE power.
• Mode Off – the port is not providing PoE power.
Usr When stacking is enabled, this mode is used to display the member ID of the individual
switch via the port Mode LEDs (for member 1, one LED is lit; for member 2, two LEDs
are lit, and so on), and to indicate which switch is the Standby (Cmd LED will blink).
Save Power This mode is indicated by ALL the mode indicator LEDs being Off. This display occurs
only if the switch has been configured with the savepower led command. See the
Management and Configuration Guide for more information on that command.
PS (Power
Supply
Status
green/
orange)
On
Blink
orange*
Off†
Normal operation. Power supply is connected and operating correctly.
A redundant power supply is installed but not connected (the switch Fault LED will not
blink simultaneously). Or, a power supply is connected but has experienced a fault (the
switch Fault LED will be blinking simultaneously).
Power supply is not connected or is not installed.
Fan Status
(green/
orange)
On
Blink
orange*
Normal operation, all fans are OK.
One of the unit’s fans has failed. The switch Fault LED will be blinking simultaneously.
PoE Status
(green/
Orange)‡
On
Off†
Blink
orange*
Fast blink
orange**
When the switch is ready to start supplying PoE power.
Should be off only during the boot process.
A port has a internal hardware failure. The switch Fault LED will be blinking
simultaneously.
A port is denied PoE power or is detecting an external PD fault.
Switch LEDs State Meaning

1-9
Introducing the HP 2920 Switches
Fronts of the Switches
Tmp
(green/
Orange)
On Switch temperature is normal.
Fast blink
orange**
An over temperature condition has been detected.
Aux Port
(green)
Used for processing a USB command file or downloading switch software code.
* The blinking behavior is an on/off cycle once every 1.6 seconds, approximately.
** The fast blinking behavior is an on/off cycle once every 0.5 seconds, approximately.
†If the Save Power LED feature is configured for the switch (savepower led command), then all LEDs except the Power
LED may be off.
‡Applies only to HP 2920 switches that support PoE/PoE+.
Switch LEDs State Meaning

1-10
Introducing the HP 2920 Switches
Fronts of the Switches
Table 1-4. Stacking-Related Switch and Port LED Behavior
Switch LEDs State Meaning
LED Mode
indicator
(green)
For switches in a stack, the LED mode indications are the same as for standalone switches (see Table
1-3), but all the switches in the stack are coordinated and all show the sameLED mode. See the Stacking
Note under “LED Mode Select Button and Indicator LEDs” on page 1-11.
Mdl(Module
Status,
green/
orange)
On
Blink
orange*
Fast blink
orange**
Off†
A Stacking Module and/or one or more 10G Expansion Modules is installed into the
expansion slots in the back of the switch and is operating correctly.
A Stacking Module or 10G Expansion Module is plugged into a module slot but has
experienced a fault (including port or transceiver faults), or the stacking cable is not
connected correctly or has experienced a fault (if using the Stacking Module).
The Stacking Module or a 10G Expansion Module has been installed while the switch
was powered on (hot swapped) and the switch needs to be rebooted to support the
module.
No modules are installed into the module slots in the back of the switch.
Stacking
Status
(green/
orange)
Cmd on
Cmd blink
green
Cmd off†
Stk on
Stk blink
green
Stk blink
orange*
Stk off†
This switch is a Commander of a stack.
This switch is becoming a Commander of a stack, or if Usr LED mode is selected,
indicates which switch is the Standby in the stack.
The switch is not the Commander of the stack.
The switch is a member of a stack.
The switch is joining a stack.
A stacking cable is disconnected or faulty, or is connected to a failed or powered off
switch. The Mdl LED may also be blinking orange simultaneously.
Stacking has been disabled.
* The blinking behavior is an on/off cycle once every 1.6 seconds, approximately.
** The fast blinking behavior is an on/off cycle once every 0.5 seconds, approximately.
†If the Save Power LED feature is configured for the switch (savepower led command), then all LEDs except the Power
LED may be off.

1-11
Introducing the HP 2920 Switches
Fronts of the Switches
LED Mode Select Button and Indicator LEDs
The operation of the Mode LED is controlled by the LED Mode select button,
and the current setting is indicated by the LED Mode indicator LEDs near the
button. Press the button to step from one view mode to the next. See the LED
information in Table 1-3 on page 1-7 for standalone switches, and in
Table 1-4 on page 1-10 for stacked switches.
Stacking
Notes:
■For HP 2920 switches that are in a stack, the Mode select button on every
switch in the stack controls the LED mode for all the switches in the stack.
■If there is a combination of PoE/PoE+ switches and non-PoE switches in
the stack, when any of the Mode select buttons is pressed to put the stack
into PoE mode, the non-PoE switches indicate no PoE support by not
illuminating any of the Mode indicator LEDs or any of the port LEDs.
■If any of the switches in the stack are configured with the Save Power
LED feature, then the default LED Mode for the whole stack becomes the
Save Power display (all LED Mode indicator LEDs are off), but only the
stack members on which that feature is configured display the other
characteristics of that feature (all LEDs Off except for the Power LED).
Figure 1-5. Example of Indicator LEDs on a non-PoE HP 2920 Switch
Figure 1-6. Example of Indicator LEDs on a PoE/PoE+ HP 2920 Switch
LED Mode select button
and indicator LEDs
LED Mode select button
and indicator LEDs

1-12
Introducing the HP 2920 Switches
Fronts of the Switches
Reset and Clear Buttons
The Reset and Clear buttons are located behind the front panel (to protect
them from being pushed accidentally) and are accessible through small holes
in the lower left corner of the front panel. Use pointed objects, such as unbent
paper clips, to push them.
The Reset and Clear buttons are used singly or in combination, as follows:
To accomplish this: Do this: This will happen:
Soft Reset
(Standalone switch)
Press and release the Reset button The switch operating system is cleared gracefully (such
as data transfer completion, temporary error conditions
are cleared), then reboots and runs self tests.
Hard Reset
(Standalone switch)
Press and hold the Reset button for
more than 5 seconds (until all LEDs
turn on), then release.
The switch reboots, similar to a power cycle. A hard reset
is used, for example, when the switch CPU is in an
unknown state or not responding.
Soft Reset
(Stacked switch)
Press and release the Reset button Same as a standalone switch, except:
• If the Commander, the Standby switch will become
Commander.
• If the Standby, a new Standby will be elected.
Hard Reset
(Stacked switch)
Press and hold the Reset button for
more than 5 seconds (until all LEDs
turn on), then release.
Same as a standalone switch, except:
• If the Commander, the Standby switch will become
Commander.
• If the Standby, a new Standby will be elected.
Delete console and
management access
passwords
Press Clear for at least one second,
but not longer than five seconds.
The switch deletes all access passwords.
Restore the factory
default configuration
1. Press Clear and Reset simultane-
ously.
2. While continuing to press Clear,
release Reset.
3. Whenthe Test LED begins blinking
(after approximately 25 seconds),
release Clear.
The switch removes all configuration changes, restores
the factory default configuration, and runs self test.
Note: These buttons are provided for your convenience. If you are concerned with switch security though, you should
make sure that the switch is installed in a secure location, such as a locked wiring closet. You can also disable these
buttons by using the front-panel-security command. See the HP 2920 Management and Configuration Guide for a
description of that command.