Allied Telesis AT-8900 SERIES Application guide

AT-8900, AT-9900, AT-9900s Switches
Hardware Reference
AT-8948
AT-9924T
AT-9924SP
AT-9924T/4SP
AT-9924Ts

Hardware Reference for AT-8900, AT-9900 and AT-9900s Series Switches
Document Number C613-03092-00 REV C
© 2003-2005 Allied Telesyn Inc. All rights reserved. No part of this publication may be
reproduced without prior written permission from Allied Telesyn Inc.
Allied Telesyn Inc. reserves the right to change specifications and other information in
this document without prior written notice. The information provided herein is subject
to change without notice. In no event shall Allied Telesyn Inc. be liable for any
incidental, special, indirect, or consequential damages whatsoever, including but not
limited to lost profits, arising out of or related to this manual or the information
contained herein, even if Allied Telesyn Inc. has been advised of, known, or should have
known, the possibility of such damages.
All company names, logos, and product designs that are trademarks or registered
trademarks are the property of their respective owners.

Hardware Reference 1
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Contents
Models Covered by this Document .................................................................... 3
Why You Should Read This Document .............................................................. 3
Hardware Overview .......................................................................................... 4
Dimensions ................................................................................................ 4
Mounting system ....................................................................................... 4
Asynchronous serial port ............................................................................ 4
AT-8900 Series Switch ................................................................................ 5
Environmental conditions ..................................................................... 5
Regulatory standards ........................................................................... 5
Switching core ..................................................................................... 5
Processing core .................................................................................... 5
Optional IPv6 accelerator card ............................................................. 5
AT-8948 model .................................................................................... 6
AT-9900 Series Switch ................................................................................ 7
Environmental conditions ..................................................................... 7
Regulatory standards ........................................................................... 7
Switching core ..................................................................................... 7
Processing core .................................................................................... 7
Network processor accelerator card ..................................................... 7
AT-9924T/4SP model ............................................................................ 8
AT-9924T model .................................................................................. 8
AT-9924SP model ................................................................................. 8
AT-9900s Series Switch ............................................................................... 9
Environmental conditions ..................................................................... 9
Regulatory standards ........................................................................... 9
Switching core ..................................................................................... 9
Processing core .................................................................................... 9
AT-9924Ts model ................................................................................. 9
Switch LEDs .................................................................................................... 10
SFP port LEDs ........................................................................................... 10
RJ-45 port LEDs ........................................................................................ 10
Ethernet port LEDs ................................................................................... 11
System LEDs ............................................................................................. 11
Using Online Documentation .......................................................................... 12
Using AT-TFTP Server ....................................................................................... 13
Using Windows Terminal and HyperTerminal ................................................... 14
How the Switch Starts Up ............................................................................... 17
AT-8900 and AT-9900 Switches ................................................................ 17
Process flow ....................................................................................... 17
Overrides ........................................................................................... 17
Regular output .................................................................................. 18
Types of messages ............................................................................. 18
AlliedWare messages ......................................................................... 18
AT-9900s Switches ................................................................................... 20
Process flow ....................................................................................... 20
Overrides ........................................................................................... 20
Regular output .................................................................................. 21
Fallback output .................................................................................. 21
Bootloader messages ......................................................................... 22
AlliedWare messages ......................................................................... 23
SFP Ports ......................................................................................................... 26
Approved SFP transceivers ........................................................................ 26
Types of SFP transceivers ........................................................................... 26
To insert or remove an SFP transceiver ...................................................... 27

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Management Ports ......................................................................................... 28
RS-232 Terminal Port (ASYN0) .................................................................. 28
Out-of-Band Ethernet Management Port .................................................. 28
Cables ............................................................................................................ 29
RS-232 Terminal and Modem Cables ........................................................ 29
RJ-45 to DB9 female terminal cable .................................................... 29
RJ-45 to DB9 male modem cable ....................................................... 30
Cables for RJ-45 Ethernet LAN Interfaces .................................................. 30
Pin assignments ................................................................................. 30
1000BASE straight-through cable ...................................................... 31
1000BASE crossover cable ................................................................. 31
Cable Guidelines ...................................................................................... 31
Troubleshooting Cables ............................................................................ 32
Cable test .......................................................................................... 32
Cable lengths .................................................................................... 32
Power Supply Units (PSUs) .............................................................................. 33
Hardware overview .................................................................................. 33
Approved PSUs and FOM ......................................................................... 34
LEDs on the PSU and FOM ........................................................................ 34
IPv6 Accelerator Card ...................................................................................... 34
How the card works ................................................................................. 34
Verifying installation ................................................................................. 34
Displaying information about the card ...................................................... 36
Memory Options ............................................................................................. 36
CompactFlash Card .................................................................................. 36
Approved CFlash cards ....................................................................... 36
Inserting and removing a CFlash card ................................................. 37
Displaying data about a CFlash card ................................................... 37
Testing a CFlash card .......................................................................... 37
Dual In-line Memory Module (DIMM) ....................................................... 38
AT-9924T and AT-9924SP switches .................................................... 38
AT-9924T/4SP switch .......................................................................... 38
AT-9924Ts switch ............................................................................... 38
Verifying DIMM installation ................................................................ 38
Expansion Options .......................................................................................... 39
SFP ports .................................................................................................. 39
XFP ports .................................................................................................. 40
RJ-45 ports ............................................................................................... 40
Test Facility ..................................................................................................... 40
Testing Ethernet LAN Ports ....................................................................... 40
Diagnostics ..................................................................................................... 41
Enabling diagnostics mode ....................................................................... 41
Running a diagnostic program .................................................................. 42
Troubleshooting .............................................................................................. 43
What to check first ................................................................................... 43
L/A LED on a port is off ............................................................................ 43
Power LED is off ....................................................................................... 44
Fault LED is on .......................................................................................... 44
Additional resources ................................................................................. 44
For More Information ...................................................................................... 45
Document sets ......................................................................................... 45
Contacting us ........................................................................................... 45

Hardware Reference 3
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Models Covered by this Document
This Hardware Reference includes information on these models:
■AT-8948
■AT-9924T/4SP
■AT-9924T
■AT-9924SP
■AT-9924Ts
■AT-PWR01 (either AC or DC power supply unit)
■AT-PWR02 (AC power supply unit only)
■AT-FAN01 (fan-only module)
Why You Should Read This Document
Use this document to familiarise yourself with the AT-8900, AT-9900, and
AT-9900s Series switches and hardware features, including power supply units
(PSUs). This reference can also help you with installation and maintenance.
However, refer to the Software Reference for information about software
configuration and installation procedures.
Keep this document or the CD-ROM in a safe place; it will be helpful if you
purchase expansion options for the switch.

4 AT-8900, AT-9900, AT-9900s Series Switches
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Hardware Overview
This section provides details about the physical characteristics of the following:
■AT-8900 Series Switch
•AT-8948 model
■AT-9900 Series Switch
•AT-9924T/4SP model
•AT-9924T model
•AT-9924SP model
■AT-9900s Series Switch
•AT-9924Ts model
The AT-8900, AT-9900, and AT-9900s Series switches have the following
common traits:
Dimensions ■Height: 44.5mm, plus 5.1mm if the rubber feet are used
■Width: 440mm, excluding rack-mounting brackets
■Depth: 440mm, excluding PSU handles
■Weight: Not more than 8.5 kg, which includes one power supply unit
(PSU) and one fan-only module (FOM)
Mounting system ■1U rack mounting; 19-inch rack-mount kit as standard
Asynchronous
serial port
■Up to 115kbps
■Universal Asynchronous Receiver Transmitter (UART)
■Standard RJ-45 connector
■Hardware-flow control

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AT-8900 Series Switch
The AT-8948 switch is the sole model in the AT-8900 Series and meets the
exceptionally high performance demands of high-end applications. It delivers
wire-speed switching performance in a robust 1U rack mount platform.
Environmental
conditions
■Operating temperature range: 0ºC to 50ºC (32 to 122ºF)
■Storage temperature range: -25ºC to 70ºC (-13 to 158ºF)
■Relative humidity range for operation: 5 to 80% non-condensing
■Relative humidity range for storage: 5 to 95% non-condensing
■Operational altitude: 3,050 metres maximum (10,000 feet)
Regulatory
standards
■EMC: EN55022 class A, FCC class A, and VCCI class A
■Immunity: EN55024, EN61000-3 levels 2 (Harmonics), and 3 (Flicker)—
AC models only
■Safety: UL60950-1, CAN/CSA-C22.2 No. 60950-1-03, EN60950,
AS/NZS60950, and EN60825-1
■Certification: UL, cUL, and TUV
Switching core ■Application-Specific Integrated Circuit (ASIC) switch chip
■Non-blocking Layer 2 and Layer 3 IP switching
■256K IPv4 address table
■4K multicast table
■4K logical Layer 3 interfaces
■Shared 32 Mbyte DDR-SDRAM packet buffer
Processing core ■350MHz RISC Processor
■128MBytes of Synchronous DRAM, expandable to 256MBytes or
512MBytes with DIMM
■32MBytes of fixed flash
■CompactFlash slot for hot-swappable expansion of flash memory up to
128MBytes
■512 kBytes of SRAM
■32/66 PCI bus for 32-bit/33MHz
■Silicon ID chip storing serial number, board ID, and MAC address
Optional IPv6
accelerator card
■Slot for network processor accelerator card that provides accelerated IPv6
unicast and multicast routing in hardware
• 4 K multicast table
• 1000 accelerator hardware filters
• 128MBytes Synchronous DRAM giving 64K IPv6 routes

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AT-8948 model Key features are:
■Autonegotiating multi-layer gigabit switch
■48 10BASE-T/100Base-TX ports (RJ-45 connectors), auto MDI/MDI-X, full
or half duplex
■4-port 1000BASE-X SFP uplink sockets, full duplex
■Hot-swappable, load sharing PSUs
■Optional AT-ACC01 network processor accelerator card
AT-8948 front panel
49 50 51 52
AT-8948 Enhanced Layer 3+Switch
ASYN0
RESET
FAULT
PSU 1 PSU 2 CF
L/A
L/A
SFP
2 4 6 8 10 12 14 161 3 5 7 9 111315 18202224 2628303217 19 21 23 25 27 29 31
D/C
34 36 38 40 42 44 46 4833 35 37 39 41 43 45 47
ENABLED FAULT
SFP
PORTS 49-52
L/A
LINK
L/A
ACT
D/C
FULL DUP HALF DUP COLACT
L/A
LINK 100M ACT LINK 10M
L/AL/A
PORTS 1-48

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AT-9900 Series Switch
AT-9900 Series switches are advanced gigabit Ethernet multi-layer switches,
perfect for the high-density rack environment where space is at a premium.
Environmental
conditions
■Operating temperature range: 0ºC to 50ºC (32ºF to 104ºF)
■Storage temperature range: -25ºC to 70ºC (-13ºF to 158ºF)
■Relative humidity range for operation: 5% to 80% non-condensing
■Relative humidity range for storage: 5% to 95% non-condensing
■Operational altitude: 3,050 metres maximum (10,000 feet)
Regulatory
standards
■EMC: EN55022 class A, FCC class A, and VCCI class A.
■Immunity: EN55024, EN61000-3, levels 2 (Harmonics), and 3 (Flicker)—
AC models only
■Safety: UL60950-1, CAN/CSA-C22.2 No. 60950-1-03, EN60950-1,
AS/NZS60950, and EN60825-1
■Certification: UL, cUL, and TUV
Switching core ■Application-Specific Integrated Circuit (ASIC) switch chip
■High performance IPv4 switching
AT-9924T and AT-9924SP
• 64MByte packet buffer memory
AT-9924T/4SP
• High performance IPv6 switching
• 160MByte packet buffer memory
Processing core ■400MHz RISC Processor
■16MBytes of fixed flash with provision for an additional 16MBytes
■CompactFlash card slot on the front panel for hot-swappable expansion of
flash memory up to 128MBytes
■512kBytes of NVSRAM
■Silicon ID chip storing serial number, board ID, MAC address, and
hardware revision level
AT-9924T and AT-9924SP
• 128MBytes of Synchronous DRAM, expandable to 256MBytes or
512MBytes with DIMM
AT-9924T/4SP
• 256MBytes of Synchronous DRAM, expandable to 512MBytes with
DIMM
• 512MBytes of Synchronous DRAM is required if AT-ACC01 network
processor accelerator card fitted
Network processor
accelerator card
AT-9924T/4SP only
■Optional network processor accelerator card provides accelerated IPv6
unicast and multicast routing in hardware
■512MBytes of Synchronous DRAM required, giving 64K IPv6 static routes
■4K multicast table
■1000 accelerator hardware filters

8 AT-8900, AT-9900, AT-9900s Series Switches
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AT-9924T/4SP model Key features are:
■Autonegotiating, multi-layer gigabit switch
■24 10BASE-T/100BASE-TX/1000BASE-T ports (RJ-45 connectors)
■4 Small Form Factor Pluggable (SFP) ports
■Hot-swappable, load sharing PSUs
■Optional AT-ACC01 network processor accelerator card
AT-9924T/4SP front panel
There are 24 ports operational at one time. The RJ-45 ports 1 to 4 use the same
physical interface as the SFP ports 1 to 4. When an SFP is inserted into an SFP
port, the corresponding RJ-45 port is disabled. For example, if an SFP is
inserted in SFP port 1, then RJ-45 port 1 is disabled. When the SFP is removed
from port 1, the RJ-45 port 1 is again operational. All other RJ-45 ports function
normally.
AT-9924T model Key features are:
■Autonegotiating, multi-layer gigabit switch
■24 10BASE-T/100BASE-TX/1000BASE-T ports (RJ-45 connectors)
■4 Small Form Factor Pluggable (SFP) ports
■Hot-swappable, load sharing PSUs
AT-9924T front panel
There can be 24 ports operational at one time. The RJ-45 ports 1 to 4 use the
same physical interface as the SFP ports 1 to 4. When an SFP is inserted into an
SFP port, the corresponding RJ-45 port is disabled. For example, if an SFP is
inserted in SFP port 1 then RJ-45 port 1 is disabled. When the SFP is removed
from port 1, the RJ-45 port 1 is again operational. All other RJ-45 ports function
normally.
AT-9924SP model Key features are:
■Autonegotiating, multi-layer gigabit switch
■24 Small Form Factor Pluggable (SFP) ports
■Hot-swappable, load sharing PSUs
AT-9924SP front panel

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AT-9900s Series Switch
The AT-9900s Series switch is a gigabit link aggregation switch that operates
with other switches that have 10Mb/100Mb/1Gb/10Gb Ethernet ports. This
switch can act as a gigabit server backbone or pass aggregated traffic over its
gigabit ports. The switch can also aggregate gigabit desktop user connections
and pass traffic to other 10 Gigabit Ethernet equipment.
Environmental
conditions
■Operating temperature range: 0º C to 40º C (32ºF to 104ºF)
■Storage temperature range: -25ºC to 70º C (-13ºF to 158ºF)
■Relative humidity range for operation: 5% to 80% non-condensing
■Relative humidity range for storage: 5% to 95% non-condensing
■Operational altitude: 3,050 metres maximum (10,000 feet)
Regulatory
standards
■EMC: EN55022 class A, FCC class A, and VCCI class A.
■EN61000-3 levels 2 (Harmonics), and 3 (Flicker)—AC models only
■Immunity: EN55024
■Safety: UL60950-1, CAN/CSA-C22.2 NO. 60950-1-03, EN60950-1,
AS/NZS60950, and EN60825-1
■Certification: UL, cUL, and TUV
Switching core ■Application-Specific Integrated Circuit (ASIC) switch chip
■High performance IPv4 switching
■128MByte packet buffer memory
Processing core ■667MHz RISC Processor
■32MBytes of non-expandable fixed flash
■512MBytes Double Data Rate (DDR) Synchronous DRAM, expandable to
1gigabyte
■512kBytes of NVSRAM
AT-9924Ts model The unmatched flexibility of the AT-9924Ts switch tailors solutions to a wide
range of networking needs. It is currently the sole model in the AT-9900s Series.
Key features are:
■Autonegotiating, multi-layer gigabit switch
■24 10/100/1000BASE-TX ports (RJ-45 connectors)
■Out-of-band 10/100/1000BASE-T Ethernet management port
■Two high-speed 20Gbps bays to support combinations of expansion
modules
■Supports dual, hot-swappable, load sharing PSUs (AT-PWR01)—a second
PSU is optional
■Optional 10GbE expansion module
■Optional 12-port SFP expansion module
■Optional 12-port RJ-45 expansion module
AT-9924Ts front panel

10 AT-8900, AT-9900, AT-9900s Series Switches
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Switch LEDs
The following LEDs report operations and faults and on the AT-8900, AT-9900,
and AT-9900s switches:
■SFP port LEDs
■RJ-45 port LEDs
■Ethernet port LEDs
■System LEDs
SFP port LEDs
RJ-45 port LEDs
LED State Description
L/A
(Link Activity)
Green On AT-8948 only, a 1000 Mbps link has been
established and is operating in full duplex
mode.
Green flashing On AT-8948 only, a full duplex activity is
occurring at 1000 Mbps.
Off On AT-8948 only and when an SFP is installed,
the link is closed.
SFP Green On the AT-9900 and AT-9900s switches, an SFP
transceiver is installed and a link has been
established.
On AT-8948, an SFP transceiver is installed.
Green flashing On the AT-9900 and AT-9900s series, an SFP
transceiver is installed and a link activity is
occurring. Not valid for AT-8948.
Amber On the AT-9900 and AT-9900s switches, an SFP
transceiver is installed but a link has not been
established. Not valid for AT-8948.
Amber flashing An SFP transceiver is installed but there is a
transmission fault.
LED State Description
L/A
(Link Activity)
Green A 1000 Mbps link has been established.
Green flashing 1000 Mbps activity is occurring.
Amber A 10/100 Mbps link has been established.
Amber flashing 10/100 Mbps activity is occurring.
D/C
(Duplex/Collision
Green The port is operating in full duplex mode.
Amber The port is operating in half duplex mode.
Amber flashing Collisions are occurring.

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Ethernet port LEDs
System LEDs
LED State Description
L/A
(Link Activity)
Green An XFP transceiver is installed and a 10 Gb link
has been established.
Green flashing An XFP transceiver is installed and link activity
is occurring.
Amber A 10/100 Mbps link has been established.
Amber flashing 10/100 Mbps activity is occurring.
D/C
(Duplex/Collision
Green The port is operating in full duplex mode.
Amber The port is operating in half duplex mode.
Amber flashing Collisions are occurring.
LED State Description
PSU 1 Green PSU 1 is installed and supplying power to the switch. The
voltage output is within specification. PSU 1 is in the right bay
when facing the rear of the switch.
Red One of the following:
•PSU 1 is installed in the switch, and either a fan has failed
or the PSU has exceeded its recommended temperature
threshold of 75º C (167º F).
•A FOM is installed in the switch and a fan has failed.
•The bay is empty.
Off A FOM is installed and operating at an acceptable speed.
For AT-9924T and AT-9924SP models, this LED is always off
because a FOM is not required.
PSU 2 Green PSU 2 is installed and supplying power to the switch. The
voltage output is within specification. PSU 2 is in the left bay
when facing the rear of the switch.
Red One of the following:
•PSU 2 is installed in the switch, and either a fan has failed
or the PSU has exceeded its recommended temperature
threshold of 75º C (167º F).
•A FOM is installed in the switch and a fan has failed.
•The bay is empty.
Off A FOM is installed and operating at an acceptable speed.

12 AT-8900, AT-9900, AT-9900s Series Switches
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Using Online Documentation
This section contains instructions on how to view online documentation on the
CD-ROM. Adobe Acrobat Reader must be installed on your computer to view
the documentation; you can install it from the CD.
1. Insert the Documentation and Tools CD in the CD-ROM drive.
If the browser menu does not appear, select Run from the Start menu. Then
type d:\start.exe (where d: is the CD-ROM drive) in the text box, and click
the OK button.
2. To view a specific document, click the document title.
3. To browse PDF documents, use any of the following to page through a
document:
• toolbar buttons, such as the Next Page button
• keyboard shortcuts, such as arrow keys
• commands from the Document menu
• mouse wheel
To go to a specific section or topic, click a bookmark, thumbnail, or
hypertext link.
Use the Search command to search for keywords or phrases.
For more information about using the Adobe Acrobat Reader, select Adobe
Reader Help from the Help menu.
4. To install one of the tools from the CD, click the link on the browser screen.
Fault Red The switch or management software is malfunctioning. This
LED lights and then turns off after hardware initialises.
1 Flash One or more heatsink fans has failed or is operating below the
recommended speed.
6 Flashes The switch’s temperature has exceeded the recommended
threshold. After flashing six times, the LED stops briefly, then
repeats the sequence.
3 Flashes For AT-9900 and AT-9900s switches, the ability to monitor
temperature and fans has failed, and it cannot report whether
they are in the supported ranges. After flashing three times, the
LED stops briefly, then repeats the sequence.
Slow
flashing
at startup
The SDRAM (DIMM) has not been detected.
Rapid
flashing
at startup
The SDRAM (DIMM) is not compatible with the switch.
CF Green
flashing
The CompactFlash memory card is active and should not be
ejected. The card can be safely ejected when the LED remains
off.
SD Off Secure Digital memory card. Not supported by 3.0.2 software.
LED State Description (cont)

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Using AT-TFTP Server
This section explains how to access and use the AT-TFTP Server. You can
transfer configuration files as well as download software upgrades with
AT-TFTP Server.
1. If AT-TFTP Server has not been installed, install it from the Documentation
and Tools CD-ROM.
Select AT-TFTP Server from the Start > Programs > Allied Telesyn >
AT-TFTP Server menu.
2. To set preferences for the AT-TFTP Server, select Options from the File
menu to display the Set Preferences dialog box shown below.
The "Default file transfer directory" field specifies the directory that
AT-TFTP Server reads from or writes to for file requests that do not include
a directory specification.
Enter a path name in the "Restrict to directory" field to prevent
unauthorised access to private directories. AT-TFTP Server uses the
specified directory even when file requests contain references to other
directories.
To prevent files from being written to the PC, click the Read only checkbox.
To use the PC to archive scripts created using the switch's create config
command, click the Read Write checkbox.
Click the OK button when you finish.
3. To load a file from AT-TFTP Server to the switch, type the following
command on a terminal connected to the RS-232 Terminal Port (ASYN0):
load method=tftp file=filename server=ipadd dest=flash
where filename is the name of the file to download and ipadd is the IP
address of the PC running AT-TFTP Server.
4. To save a TFTP Server log, select Save As from the File menu. TFTP
requests are logged to the AT-TFTP Server main window.

14 AT-8900, AT-9900, AT-9900s Series Switches
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Using Windows Terminal and
HyperTerminal
You can use a PC running terminal emulation software as the manager console,
instead of a terminal. There are many terminal emulation applications
available for PCs, but the most readily available are the Terminal and
HyperTerminal applications included in Microsoft Windows 98, 2000, and
XP Professional. In standard Windows installations, HyperTerminal is
available from the Communications submenu.
The key to successful use of terminal emulation software with the switch is to
configure the software and switch with matching communications parameters.
The following procedure can be applied to most terminal emulation programs.
Dialog boxes in the procedure are from Windows 2000 and XP Professional.
To configure Windows HyperTerminal for 2000 and XP Professional
1. Start the program in Windows by doing one of the following:
• Select Programs > Accessories > Communications > HyperTerminal.
• Double-click the Hypertrm.exe icon.
2. In the Connection Description dialog box:
• Enter a name for the connection, such as AT99001.
• Select an icon from the scrollable list and click the OK button.

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3. In the “Connect using” field on the Connect To dialog box, select the COM
port on the PC used to connect to the switch. and click the OK button.
4. In the COMnProperties dialog box, set port parameters as follows, and
click the OK button.

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5. From the main HyperTerminal window, select Properties from the File
menu. Click the Settings tab, and set the Properties dialog box as follows.
6. Click ASCII Setup to display the ASCII Setup dialog box, and ensure the
following options are not selected:
• Echo typed characters locally
• Append line feeds to incoming line ends
Set other parameters as necessary and click the OK buttons on both dialog
boxes to close them.
7. Save the current session by selecting Save from the File menu on the main
HyperTerminal window. This creates a connection icon with the name you
assigned in the HyperTerminal group.
To use the configuration, double-click the connection icon. When the
HyperTerminal window appears, press the Enter key several times; the
switch’s login prompt is then displayed.

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How the Switch Starts Up
When the switch starts up following a power cycle or an operator-initiated
reboot (using the reset button or restart command), it performs a series of tests
and sends messages to the terminal or PC connected to the ASYN0 port. After
the switch successfully starts, a prompt is displayed for you to log in. Refer to
the Installation and Safety Guide for basic login instructions or to the Getting
Started chapter in the Software Reference.
AT-8900 and AT-9900 Switches
Process flow When an AT-8900 or AT-9900 switch starts, it performs the following
operations.
Overrides The switch pauses briefly during routine startup messages to display the
following prompt:
Force EPROM download (Y)?
If you do nothing, switch software is loaded along with a preconfigured
startup script. For troubleshooting, change the process by using the following
keys.
Stage This happens... Done by...
1 Self-tests run that check basic operations. Boot ROM
2 A prompt is displayed briefly to allow a user-override. Users can
change the startup process by pressing special keys (see
Overrides). If they enter nothing, the process continues.
Boot ROM
3 The flash boot release is loaded as the install software. Boot ROM
4 Install information is checked and the switch boots up from
either the preferred or default install.
Boot ROM
5 The startup configuration script that the user specified is
executed.
Preferred or
default software
6 Startup is complete and the switch starts switching traffic if
devices connected to it are sending traffic.
Release software
Pressing this key... Forces the switch to...
Y Load the flash boot release with no patch.
S Start with the default configuration so that any boot script is ignored.
Ctrl+D Enter diagnostics mode. For more information, see “Diagnostics” on
page 41.

18 AT-8900, AT-9900, AT-9900s Series Switches
Software Release 3.0.2
C613-03092-00 REV C
Regular output The following messages are an example of output from AT-8900 and AT-9900
switches.
Types of messages The following table explains the types of messages that AT-8900 and AT-9900
switches generate during initial startup.
AlliedWare
messages
The following table explains messages in the output of AT-8900 and AT-9900
switches.
INFO: Self tests beginning.
INFO: RAM test beginning.
PASS: RAM test, 131072k bytes found.
INFO: BBR tests beginning.
PASS: BBR test, 512k bytes found.
INFO: Self tests complete
INFO: Downloading switch software.
Force EPROM download (Y) ?
INFO: Initial download succeeded
INFO: Executing configuration script <boot.cfg>
INFO: Switch startup complete
Type Description
INFO An action has been taken by the system.
PASS A test has been completed successfully.
ERROR An error message that a test has failed but the system continues to
operate.
FAIL An error message that a fatal error condition has caused the system to halt
in an unrecoverable fashion.
Message Description
INFO: Self tests beginning. Code loader tests are about to begin.
INFO: RAM tests beginning RAM tests are about to begin.
PASS: RAM test, 131072k
bytes found
RAM test passed and the switch is using the indicated
amount of memory.
ERROR: RAM test test-number.
Error address = address
For example:
ERROR: RAM test 5. Error
address = 00345678
The given RAM test failed at the given address, which
means the memory system is faulty. The test repeats until
it passes. If the error continues, contact your authorised
distributor or reseller.
INFO: BBR tests beginning BBR battery tests are about to begin.
PASS: BBR test. Battery OK BBR battery tests passed.
ERROR: BBR Battery low BBR battery test failed, indicating that the battery is
running low. The BBR battery must be replaced. Contact
your authorised Allied Telesyn distributor or reseller.
PASS: BBR test, 512k bytes
found
BBR size/location test passed with the indicated amount of
BBR found.