Samsung WEC8500 User manual

WEC8500/8050 Maintenance Manual Version 5.1
Samsung Electronics America page 1 of 87
WEC8500/WEC8050 (APC)
Maintenance Manual

WEC8500/8050 Maintenance Manual Version 5.1
Samsung Electronics America page 2 of 87
Disclaimer
Every effort has been made to eliminate errors and ambiguities in the information contained in this
document. Any questions concerning information presented here should be directed to
SAMSUNG ELECTRONICS AMERICA, 1301 E. Lookout Dr., Richardson, TX. 75082 telephone
[phone]. SAMSUNG ELECTRONICS AMERICA disclaims all liabilities for damages arising
from the erroneous interpretation or use of information presented in this manual.
Publication Information
SAMSUNG ELECTRONICS AMERICA reserves the right without prior notice to revise information
in this publication for any reason. SAMSUNG ELECTRONICS AMERICA also reserves the right
without prior notice to make changes in design or components of equipment as engineering and
manufacturing may warrant.
Copyright 2015
Samsung Electronics America
All rights reserved. No part of this manual may be reproduced in any form or by any means-
graphic, electronic or mechanical, including recording, taping, photocopying or information retrieval
systems –without express written permission of the publisher of this material.
Trademarks
Product names mentioned in this manual may be trademarks and/or registered trademarks of their respective
companies.

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INTRODUCTION
Purpose
This manual describes how to identify the cause of failures which occur in the Access Point
Controller (APC) system and troubleshoot them.
This manual is written based on version 2.4.19R for WEC8500 and WEC8050.
Audience
This manual is intended for operator of Samsung WEC8500.
Document Content and Organization
This manual consists of 5 Chapters, 1 Annex, and a list of Abbreviations.
CHAPTER 1. System Management
This chapter describes the symptoms of the APC system and their solutions.
CHAPTER 2. WLAN Management
This chapter describes the possible problems and their solutions for Wireless Local Area
Network (WLAN) services.
CHAPTER 3. Connection Management with AP
This chapter describes the possible problems and their solutions when connecting to the
Access Point (AP).
CHAPTER 4. Security Management
This chapter describes the possible problems and their solutions while using various
security features.

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CHAPTER 5. Wi-Fi Management
This chapter describes the problems which could occur concerning settings for the wireless
interface using Wi-Fi.
ANNEX A. Problem Analysis Log List
This describes a summary of meanings, locations, and methods of extraction for the logs
helpful for problem analysis of the system.
ABBREVIATION
Describes the acronyms used in this manual.
Conventions
The following types of paragraphs contain special information that must be carefully read
and thoroughly understood. Such information may or may not be enclosed in a rectangular
box, separating it from the main text, but is always preceded by an icon and/or a bold title.
NOTE
Indicates additional information as a reference.
Console Screen Output
The lined box with ‘Courier New’font will be used to distinguish between the
main content and console output screen text.
‘Bold Courier New’font will indicate the value entered by the operator on the
console screen.

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WEEE Symbol Information
This marking on the product, accessories or literature indicates that the product and
its electronic accessories (e.g. charger, headset, USB cable) should not be disposed
of with other household waste at the end of their working life. To prevent possible
harm to the environment or human health from uncontrolled waste disposal, please
separate these items from other types of waste and recycle them responsibly to
promote the sustainable reuse of material resources.
Household users should contact either the retailer where they purchased this product, or their
local government office, for details of where and how they can take these items for
environmentally safe recycling.
Business users should contact their supplier and check the terms and conditions of the purchase
contract. This product and its electronic accessories should not be mixed with other commercial
wastes for disposal.
Revision History
VERSION
DATE OF ISSUE
REMARKS
5.1
02.2015.
Updated for US Market to support software V2.4.19R
5.0
05. 2014.
Modified. (S/W package Ver.2.0.0)
- Changed
1.3.2 Upgrade completed successfully but the system
was not booted successfully due to an error in the
upgraded package.
3.1.1 AP network setting error
3.1.3 AP registration error
3.2 Automatic Upgrade does not Work on AP
3.3 Problem Creating APs
4.2 Cannot Detect Unauthorized APs
5.1 Problem with Radio Settings
5.2 Problem with Tx Power Settings
4.0
01. 2014.
- Changed
1.3.2 Printout Message
5.4 Contents
3.0
10. 2013.
- The related contents of WEC8050 APAdded
(integrated WEC8500 and WEC8050)
- Revised with S/W package upgrade
(WEC8500 version 1.4.4, WEC8050 version 1.0.0)
2.0
06. 2013.
- Added
1.3.2
- Changed
2.1.1, 5.3 Printout Message
1.3.1, 2.3.1, 3.3, 5.2 Contents
1.0
03. 2013.
First Version

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TABLE OF CONTENTS
Purpose......................................................................................................................................................3
Audience....................................................................................................................................................3
Document Content and Organization.......................................................................................................3
Conventions...............................................................................................................................................4
Console Screen Output.............................................................................................................................4
WEEE Symbol Information.......................................................................................................................5
Revision History.........................................................................................................................................5
CHAPTER 1. System Management 9
1.1 System Booting.........................................................................................................................9
1.1.1 Booting failure due to system overheating..................................................................................9
1.1.2 Booting failure due to physically damaged disk........................................................................11
1.1.3 Booting failure due to file system error......................................................................................12
1.1.4 Booting failure due to damaged kernel image ..........................................................................14
1.2 System Messages (Alarms/Events) .......................................................................................17
1.2.1 Alarm or event is not generated.................................................................................................17
1.2.2 System log message is not displayed .......................................................................................18
1.2.3 Incorrect alarms are generated..................................................................................................20
1.2.4 Syslog messages are not sent to the syslog server .................................................................21
1.3 Upgrade Failures.....................................................................................................................23
1.3.1 Upgrade was canceled due to its failure. ..................................................................................23
1.3.2 Upgrade completed successfully but the system was not booted successfully due to an error
in the upgraded package........................................................................................................................24
1.4 Problem in Process Operation...............................................................................................25
1.5 Device-related Alarms.............................................................................................................27
1.5.1 System TemperatureAlarm........................................................................................................27
1.5.2 Temperature Sensor FailAlarm .................................................................................................28
1.5.3 Fan Fail Alarm.............................................................................................................................29
1.5.4 Thermal ShutdownAlarm...........................................................................................................29
1.5.5 Disk UsageAlarm.......................................................................................................................30
1.5.6 Disk FullAlarm............................................................................................................................31
1.6 SNMP 32

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1.6.1 No SNMP response....................................................................................................................32
1.6.2 Trap cannot be sent....................................................................................................................33
1.7 Configuration Management ....................................................................................................34
1.7.1 Error when executing ‘save local’ ..............................................................................................34
1.7.2 Error when executing ‘import’ ....................................................................................................36
1.7.3 Error when executing ‘export’ ....................................................................................................38
1.8 Web UI.......................................................................................................................................40
1.8.1 Access error................................................................................................................................40
1.8.2 Login error...................................................................................................................................42
CHAPTER 2. WLAN Management 43
2.1 WLAN Settings.........................................................................................................................43
2.1.1 BSSID of WLAN is not generated .............................................................................................43
2.2 Access Authentication of Wireless Station ...........................................................................45
2.2.1 802.1x authentication failure......................................................................................................45
2.2.2 PSK authentication failure..........................................................................................................47
2.2.3 Static WEP access failure..........................................................................................................48
2.3 Additional WLAN Services......................................................................................................50
2.3.1 Clustering function does not work..............................................................................................50
2.3.2 Spectrum analysis is not provided.............................................................................................52
2.3.3 Max clients restriction function does not work ..........................................................................54
CHAPTER 3. Connection Management with AP 55
3.1 CAPWAP Status is not RUN....................................................................................................55
3.1.1 AP network setting error.............................................................................................................55
3.1.2 AP management IP in APC setting error...................................................................................59
3.1.3 AP registration error....................................................................................................................61
3.2 Automatic Upgrade does not Work onAP ................................................................................63
3.3 Problem Creating APs.............................................................................................................67
CHAPTER 4. Security Management 69
4.1 Firewall does not Work............................................................................................................69
4.2 Cannot Detect Unauthorized APs...........................................................................................71
CHAPTER 5. Wi-Fi Management 72
5.1 Problem with Radio Settings ..................................................................................................72
5.2 Problem with Tx Power Settings ............................................................................................74

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5.3 RRM does not Work ................................................................................................................79
5.4 Location Tracking does not Work..........................................................................................81
ANNEX A. Problem Analysis Log List 82
A.1 crash log ..................................................................................................................................82
A.2 trace log ...................................................................................................................................83
A.3 debug log.................................................................................................................................84
LIST OF FIGURES
Figure 1. Web UI Access Error Window .....................................................................................40
Figure 2. Web UI Login Error Window........................................................................................42
Figure 3. Web UI-802.1x authentication failure...........................................................................45
Figure 4. Web UI-PSK authentication failure..............................................................................47
Figure 5. Web UI-Static WEP access failure ..............................................................................48
Figure 6. Web UI-Clustering function does not work ..................................................................52

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CHAPTER 1. System Management
This chapter describes the symptoms of the APC system and their solutions.
1.1 System Booting
This section describes the symptoms occurring during the system booting, their causes and
solutions.
1.1.1 Booting failure due to system overheating
While the APC system is booting, if the boot loader detects system overheat, booting is
stopped and power is automatically turned off to protect the hardware from any possible
damages.
Symptoms
During the booting, the ‘CPU overheat detected’ log indicating overheating of the central
processing unit (CPU) is displayed in the boot loader, and then the power is automatically
turned off.
WEC8500: The power is still supplied to the power module and the fan of the power
module remains operational.
WEC8050: For there is no separate power module, the fan does not operate after
power-off.
SATA link up 3.0 Gbps (SStatus 123 SControl 320)
scanning bus for devices...
Device 0: (0:0) Vendor : ATA Prod.: SanDisk SSD P4 1 Rev: SSD
Type : Hard Disk
Capacity : 15272.0 MB = 14.9 GB (31277232 x 512)
USB : USB EHCI 1.00
scanning bus for devices... 2 USB Device(s) found
Type the command 'usb start' to scan for USB storage devices.
boot partition: 2
CPU overheat detected (cpu:91, thr: 85)

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######################################################################
System will be shutdown to prevent critical hardware damage
######################################################################
Possible Causes
This occurs if the CPU temperature exceeds the booting threshold (85ºC) for the following
reasons:
Malfunctioning of the fan
Operational error of the temperature sensor
Problem with the ambient temperature of the installation environment
Solutions
1) Switch off the power module on the rear of the APC.
2) Cool the APC sufficiently in room temperature or low temperature environment and
then try booting again.
3) If the symptom persists, contact the Samsung Technical Support Team for the
countermeasure.

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1.1.2 Booting failure due to physically damaged disk
This occurs if kernel loading fails due to physical damage of the Solid State Disk (SSD)
while the APC is booting.
Symptoms
The ‘system kernel loading fail (status: 0)’ log is displayed during booting and the system
restarts 3 times. Then, the system goes to the shell environment of the boot loader.
##### BOOTING START #####
Looking for valid bootloader image....
(Omitted)
SATA link down (SStatus 0 SControl 320)
scanning bus for devices...
No Link on port 0!
scsi_ahci: SCSI inquiry command failure.
system kernel loading fail (status: 0)
(Omitted - Retry the same process for three times when the board is
reset)
SATA link down (SStatus 0 SControl 320)
scanning bus for devices...
No Link on port 0!
scsi_ahci: SCSI inquiry command failure.
system kernel loading fail (status: 0)
USB: USB EHCI 1.00
scanning bus for devices... 1 USB Device(s) found
Type the command 'usb start' to scan for USB storage devices.
boot partition: 1
######################################################################
#########
Bootloader failed to load kernel and reset the system to recover from
fault.
Check your system non-volatile storage device and package images.
######################################################################
#########
Octeon wec8500#
Possible Causes
Physical input/output (I/O) of the disk is not possible during the booting process for the
following reasons:
No disk device is installed
The disk device is not detected because the disk device connector is not correctly
connected.
The disk device has sustained an irrecoverable physical damage.
Solutions
Contact the Samsung Technical Support Team for the countermeasure.

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1.1.3 Booting failure due to file system error
This occurs if an error occurs in the booting partition installed on the disk or in the file
system while theAPC is booting which leads to the kernel loading failure.
Symptoms
The ‘system kernel loading fail (status: 1)’ log is displayed during booting process and the
system restarts 3 times. Then, the system goes to the shell environment of the boot loader.
##### BOOTING START #####
Looking for valid bootloader image....
(Omitted)
boot partition: 1
Enter password to stop autoboot.
** Bad partition 1 **
system kernel loading fail (status: 1)
(Omitted - Retry the same process for three times when the board is
reset)
boot partition: 1
Enter password to stop autoboot.
** Bad partition 1 **
system kernel loading fail (status: 1)
Fail from partion 1 now we boot from partition:2
Setting boot partition to: 2
Writing tuple type 61441 to addr: 0x40
** Bad partition 2 **
Error: Bad gzipped data
argv[2]: coremask=0xff
argv[3]: endbootargs
## No elf image at address 0x20700000
system kernel loading fail (status: 2)
bootoctlinux: fail to boot up linux kernel (rcode: 1)
######################################################################
#########
Bootloader failed to load kernel and reset the system to recover from
fault.
Check your system non-volatile storage device and package images.
######################################################################
#########
Octeon wec8500#

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Possible Causes
During the booting process, kernel image loading is not possible for the following reasons:
Neither the primary (active) partition nor the stand-by partition is detected due to
damaged partition table.
The partition table is normal, but both the primary partition and the stand-by partition
are formatted.
The file system is normal but the kernel is not found within the file system on the
primary partition and the stand-by partition
Solutions
Contact the Samsung Technical Support Team for the countermeasure.

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1.1.4 Booting failure due to damaged kernel image
This occurs if the kernel image on the primary partition of the disk is damaged and cannot
be loaded while the APC is booting.
Symptoms
The ‘system kernel loading fail (status: 2)’ log is displayed during booting and the system
restarts 3 times. Then, the system goes to the shell environment of the boot loader.
##### BOOTING START #####
Looking for valid bootloader image....
(Omitted)
boot partition: 1
Enter password to stop autoboot.
Loading file "/boot/vmlinux.gz" from scsi device 0:1 (sda1)
0 bytes read
Error: Bad gzipped data
argv[2]: coremask=0xff
argv[3]: endbootargs
## No elf image at address 0x20700000
system kernel loading fail (status: 2)
(Omitted - Retry the same process for three times when the board is
reset)
boot partition: 1
Enter password to stop autoboot.
Loading file "/boot/vmlinux.gz" from scsi device 0:1 (sda1)
0 bytes read
Error: Bad gzipped data
argv[2]: coremask=0xff
argv[3]: endbootargs
## No elf image at address 0x20700000
system kernel loading fail (status: 2)
bootoctlinux: fail to boot up linux kernel (rcode: 1)
######################################################################
#########
Bootloader failed to load kernel and reset the system to recover from
fault.
Check your system non-volatile storage device and package images.
######################################################################
#########
Octeon wec8500#

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Possible Causes
During the booting process, kernel image loading is not possible for the following reasons:
The kernel image exists on the primary partition but the file is damaged and corrupted
from the original.
The kernel image is overwritten with another file.
Solutions
1) In the boot loader log, use the ‘boot partition’ message to check the primary partition
information. (‘1’ or ‘2’)
boot partition: 1
(Omitted)
######################################################################
#########
Bootloader failed to load kernel and reset the system to recover from
fault.
Check your system non-volatile storage device and package images.
######################################################################
#########
2) Rollback to the previous package residing on the stand-by partition.
To rollback, if the primary partition is ‘1’, set the boot partition to ‘2’. Or, if the
primary partition is ‘2’, set the boot partition to ‘1’.
Octeon wec8500# tlv_eeprom set boot 2
Setting boot partition to : 2
Writing tuple type 61441 to addr : 0x40
3) Restart the system.
Octeon wec8500# reset
4) When booting is completed, execute the ‘package upgrade’ command with the official
package of a desired version to upgrade. When upgrading is completed, the system
restarts to apply the package.
An example of executing the upgrade command is as follows.
WEC8500# configure terminal
WEC8500/configure# package upgrade disk:/package/wec8500_0.8.1.R.bin
Notice: The system will reboot after upgrading with the file.
Do you want to save the configuration? (y/n): y

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Do you want to upgrade the system? (y/n): y
Package Validation check ... success
Package Upgrade .................... done
Success
5) When booting is completed normally, check that the new package has been applied to
the system.
WEC8500# show reboot cause
Reboot Cause: Block: Upgrade/ Code: Package Upgrade
WEC8500# show version
Samsung package version information
Primary (currently running)
ver : 0.8.1.R
buildTime : Mon Aug 20 11:35:43 2012
builder : apcbuilder
buildDir : /home2/apcbuild/wec8500/apc
Backup
ver : 0.7.1.R
buildTime : Mon Aug 03 09:27:19 2012
builder : apcbuilder
buildDir : /home2/apcbuild/wec8500/apc
Boot rom version information
ver : FI10_17:15:14

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1.2 System Messages (Alarms/Events)
This section describes symptoms, causes and solutions of problems occurring to the system
messages (alarms, events, logs, etc.).
1.2.1 Alarm or event is not generated
Symptoms
Alarm output command does not reveal any information on alarms or events.
WEC8500# show alarm history all
Error : can not read the file
WEC8500# show event
Error : can not read the file
or
WEC8500# show alarm history all
WEC8500# show event
Possible Causes
The alarm format has changed due to the package upgrade.
The alarm format is unknown.
Solutions
1) Before changing the alarm format, delete all previously generated alarm logs.
Deleting alarms of the format prior to change:
WEC8500# clear log alarm
Deleting current alarms of the format prior to change:
WEC8500#clear log actalarm
2) Apply the new alarm format.
WEC8500#clear log alarminfo

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3) Check the alarm and event logs again.
WEC8500# show alarm history all
WEC8500# show event
1.2.2 System log message is not displayed
Log messages may not be generated due to log message format errors or incorrect filter
settings.
Symptoms
Log output command does not generate any log messages.
WEC8500# show debug log all
Error : can not read the file
Or only some messages are generated as shown below.
WEC8500# show debug log all
1 evm [2012-08-18 12:48:33.548] WRN Clear Debug Detail Log file
2 evm [2012-08-18 12:47:29.884] WRN Clear Debug Log file
3 eqm [2012-08-31 17:42:05.546] MAJ CPU Load Alarm Cleared - CPUID(4)
LOAD(0.000000) Threshold(90)
…
Possible Causes
The ‘Error: cannot read the file’ error is generated because of format error of log messages.
The log message format has changed after upgrading the package.
The log message format is unknown.
Only some log messages are generated because of filter settings of levels or module names
of log messages.
Solutions
If log messages are not generated due to format problems, take the following steps.
1) Delete all logs and allow a new log format to be applied.
WEC8500# clear log debug

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2) Check the log messages again.
WEC8500# show debug log all
In case of incorrect filter settings, take the following steps.
1) Check the log filter settings.
WEC8500# show debug log conf
---------------------------------------------
Debug Log Configuration
---------------------------------------------
Debug Log Mode On
Debug Log Module Filter all
Debug Log Level Filter warning
Debug Log File Size 10 MBytes
Debug Log File Count 1
Module STD Out Off
Module Filter STD Out all
Module Level Filter STD Out debug
2) Execute the ‘debug log level’ and ‘debug log module’ commands to reset the log filter.
WEC8500# debug log level <critical|major|minor|warning>
WEC8500# debug log module <evm|swm|cm|list|NAME>
3) Check the log messages again.
WEC8500# show debug log all

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1.2.3 Incorrect alarms are generated
After upgrading the package, the alarm table may be changed as shown below. In this case,
when an alarm is generated, another alarm message may be displayed.
Previous alarm table:
WEC8500# show alarm info
1 system CRT Loss Of Signal
…
82 network CRT NET Duplicated IP
83 network CRT NET Rx Multicaet Queue Full
84 network MAJ NET Heartbeat Loss Trap
85 network MIN NET VLAN Request Failure
86 network MAJ NET VLAN Default CFG Failure
87 network MAJ NET VLAN Restore Failure Trap
88 network CRT NET Link failure
Alarm table which is changed after upgrading the package:
WEC8500# show alarm list all
1 network 2012-08-31 11:09:24 MAJ APC Index[1] Name[ge1] 1301 NET
Link dn AdminStatus[up] OperStatus[down]
Symptoms
An alarm is generated, but message for another alarm is generated instead of the correct
alarm.
Possible Causes
Content of the alarm table has changed after upgrading the package.
Items have been added to or deleted from the alarm table after upgrading the package.
Solutions
1) Delete the existing alarm information in order to build the alarm table in a new format.
WEC8500# clear log alarminfo
2) When an alarm is generated, check the alarm information again.
WEC8500# show alarm info