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CloudEngine 6800&5800 Series Switches
V100R002C00
Troubleshooting
Issue 01
Date 2013-08-01
HUAWEI TECHNOLOGIES CO., LTD.
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Copyright Huawei Technologies Co., Ltd. 2013. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior written
consent of Huawei Technologies Co., Ltd.
Trademarks and Permissions
and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective holders.
Notice
The purchased products, services and features are stipulated by the contract made between Huawei and the
customer. All or part of the products, services and features described in this document may not be within the
purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,
and recommendations in this document are provided "AS IS" without warranties, guarantees or representations
of any kind, either express or implied.
The information in this document is subject to change without notice. Every effort has been made in the
preparation of this document to ensure accuracy of the contents, but all statements, information, and
recommendations in this document do not constitute a warranty of any kind, express or implied.
Huawei Technologies Co., Ltd.
Address: Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Website: http://enterprise.huawei.com
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About This Document
Intended Audience
This document describes common troubleshooting procedure and methods.
This document is intended for:
l Data configuration engineers
l Commissioning engineers
l Network monitoring engineers
l System maintenance engineers
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol Description
DANGER
Indicates a hazard with a high level or medium level of risk
which, if not avoided, could result in death or serious injury.
WARNING
Indicates a hazard with a low level of risk which, if not
avoided, could result in minor or moderate injury.
CAUTION
Indicates a potentially hazardous situation that, if not
avoided, could result in equipment damage, data loss,
performance deterioration, or unanticipated results.
TIP Provides a tip that may help you solve a problem or save time.
NOTE Provides additional information to emphasize or supplement
important points in the main text.
Command Conventions
The command conventions that may be found in this document are defined as follows.
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Convention Description
Boldface The keywords of a command line are in boldface.
Italic Command arguments are in italics.
[ ] Items (keywords or arguments) in brackets [ ] are optional.
{ x | y | ... } Optional items are grouped in braces and separated by
vertical bars. One item is selected.
[ x | y | ... ] Optional items are grouped in brackets and separated by
vertical bars. One item is selected or no item is selected.
{ x | y | ... }* Optional items are grouped in braces and separated by
vertical bars. A minimum of one item or a maximum of all
items can be selected.
[ x | y | ... ]* Optional items are grouped in brackets and separated by
vertical bars. You can select one or several items, or select
no item.
& The parameter before the & sign can be repeated 1 to n times.
# A line starting with the # sign is comments.
Change HistoryUpdates between document issues are cumulative. Therefore, the latest document issue contains
all updates made in previous issues.
Changes in Issue 01 (2013-08-01)
Initial commercial release.
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Contents
About This Document.....................................................................................................................ii
1 Instructions for Maintenance Engineers...................................................................................1
1.1 Precautions......................................................................................................................................................................2
1.2 Backing Up Data................................................................................................................ ............................................21.3 Troubleshooting Process.................................................................................................................................................2
1.4 Ask for Help...................................................................................................................................................................3
1.4.1 Huawei Enterprise Website.........................................................................................................................................3
1.4.2 Hotline.........................................................................................................................................................................3
2 Forgetting Passwords....................................................................................................................4
2.1 Recovering the Console Port Password..........................................................................................................................5
2.2 Recovering the Telnet Login Password..........................................................................................................................7
3 Information Collection.................................................................................................................8
3.1 Overview........................................................................................................................................................................9
3.2 CollectingDiagnostic Information.................................................................................................................................9
3.3 Health Status Information...............................................................................................................................................9
4 System Maintenance Methods..................................................................................................10
4.1 Restoring the Default Settings Using the Configuration File.......................................................................................11
4.2 Restartingthe Device....................................................................................................................................................11
4.3 Upgradingthe Device...................................................................................................................................................12
4.4 Transferring Files Using FTP/TFTP.............................................................................................................................12
5 Startup Failures............................................................................................................................165.1 Terminal Does Not Display Anything Or Displays Garbled Characters......................................................................17
6 Hardware.......................................................................................................................................18
6.1 Power Module Troubleshooting...................................................................................................................................19
6.1.1 The SYS and Power Module Indicators Are Off.......................................................................................................19
6.2 Fan Module Troubleshooting.......................................................................................................................................19
6.2.1 The Indicator of a Fan Module Is Steady Red...........................................................................................................19
6.2.2 Fan Noise Is Loud......................................................................................................................................................20
6.2.3 An Alarm Is Generated When the Fan Status Is Abnormal.......................................................................................20
6.2.4 Fan Blades Were Damaged.......................................................................................................................................21
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6.3 Optical Module Troubleshooting..................................................................................................................................21
6.3.1 Optical Modules on the Local and Remote Devices Cannot Communicate.............................................................21
6.4 Interface Troubleshooting.............................................................................................................................................24
6.4.1 A 40GE Interface Fails to Be Split into 10GE Interfaces or 10GE Interfaces Fail to Be Merged into A 40GE Interface
............................................................................................................................................................................................24
6.4.2 An Electrical Interface Cannot Go Up.......................................................................................................................25
6.4.3 10GE Optical Interfaces Cannot Go Up....................................................................................................................26
6.4.4 40GE Optical Interfaces Cannot Go Up....................................................................................................................28
6.4.5 Packet Loss Occurs on An Interface..........................................................................................................................29
7 Patch and Upgrade Faults..........................................................................................................31
7.1 Patch Faults...................................................................................................................................................................32
7.1.1 Failed toInstall a Patch.............................................................................................................................................32
8 Service Faults................................................................................................................................338.1 LAN..............................................................................................................................................................................34
8.1.1 VLAN Troubleshooting.............................................................................................................................................34
8.1.1.1 Users in a VLAN Cannot Communicate with Each Other.....................................................................................34
8.1.1.1.1 Common Causes..................................................................................................................................................34
8.1.1.1.2 Troubleshooting Flowchart..................................................................................................................................34
8.1.1.1.3 Troubleshooting Procedure..................................................................................................................................36
8.1.1.1.4 Relevant Alarms and Logs..................................................................................................................................38
8.1.2 MSTP Troubleshooting.............................................................................................................................................38
8.1.2.1 MSTP Topology Change Leads to Service Interruption........................................................................................388.1.2.1.1 Common Causes..................................................................................................................................................38
8.1.2.1.2 Troubleshooting Flowchart..................................................................................................................................38
8.1.2.1.3 Troubleshooting Procedure..................................................................................................................................40
8.1.2.1.4 Relevant Alarms and Logs..................................................................................................................................43
8.2 IP Forwarding and Routing..........................................................................................................................................44
8.2.1 RIP Troubleshooting .................................................................................................................................................44
8.2.1.1 Device Does not Receive Partial Routes or All the Routes....................................................................................44
8.2.1.1.1 Common Causes..................................................................................................................................................44
8.2.1.1.2 Troubleshooting Flowchart..................................................................................................................................44
8.2.1.1.3 Troubleshooting Procedure..................................................................................................................................46
8.2.1.1.4 Relevant Alarms and Logs..................................................................................................................................47
8.2.1.2 Device Does not Send Partial or All the Routes.....................................................................................................48
8.2.1.2.1 Common Causes..................................................................................................................................................48
8.2.1.2.2 Troubleshooting Flowchart..................................................................................................................................49
8.2.1.2.3 Troubleshooting Procedure..................................................................................................................................51
8.2.1.2.4 Relevant Alarms and Logs..................................................................................................................................53
8.2.1.3 Trouble Cases.........................................................................................................................................................53
8.2.1.3.1 A RIP Error Occurs due to Discontinuous Subnets.............................................................................................53
8.2.2 OSPF Troubleshooting..............................................................................................................................................55
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8.2.2.1 OSPF Neighbor Relationship Is Down...................................................................................................................55
8.2.2.1.1 Common Causes..................................................................................................................................................55
8.2.2.1.2 Troubleshooting Flowchart..................................................................................................................................55
8.2.2.1.3 Troubleshooting Procedure..................................................................................................................................56
8.2.2.1.4 Relevant Alarms and Logs..................................................................................................................................60
8.2.2.2 OSPFNeighbor Relationship Cannot Enter the Full State.....................................................................................60
8.2.2.2.1 Common Causes..................................................................................................................................................60
8.2.2.2.2 Troubleshooting Flowchart..................................................................................................................................61
8.2.2.2.3 Troubleshooting Procedure..................................................................................................................................62
8.2.2.2.4 Relevant Alarms and Logs..................................................................................................................................63
8.2.3 BGP Troubleshooting................................................................................................................................................63
8.2.3.1 BGP Peer Relationship Fails to Be Established.....................................................................................................63
8.2.3.1.1 Common Causes..................................................................................................................................................63
8.2.3.1.2 Troubleshooting Flowchart..................................................................................................................................64
8.2.3.1.3 Troubleshooting Procedure..................................................................................................................................65
8.2.3.1.4 Relevant Alarms and Logs..................................................................................................................................69
8.2.3.2 BGP Public Network Traffic Is Interrupted...........................................................................................................69
8.2.3.2.1 Common Causes..................................................................................................................................................69
8.2.3.2.2 Troubleshooting Flowchart..................................................................................................................................69
8.2.3.2.3 Troubleshooting Procedure..................................................................................................................................70
8.2.3.2.4 Relevant Alarms and Logs..................................................................................................................................73
8.2.3.3 BGP Private Network Traffic Is Interrupted..........................................................................................................73
8.2.3.3.1 Common Causes..................................................................................................................................................73
8.2.3.3.2 Troubleshooting Flowchart..................................................................................................................................73
8.2.3.3.3 Troubleshooting Procedure..................................................................................................................................75
8.2.3.3.4 Relevant Alarms and Logs..................................................................................................................................79
8.2.3.4 Troubleshooting of the Fault that Prevents a Local BGP Peer (Route Sender) from Receiving ORFs from a Remote
Peer (Route Receiver).........................................................................................................................................................79
8.2.3.4.1 Common Causes..................................................................................................................................................79
8.2.3.4.2 Troubleshooting Flowchart..................................................................................................................................80
8.2.3.4.3 Troubleshooting Procedure..................................................................................................................................81
8.2.3.4.4 Relevant Alarms and Logs..................................................................................................................................84
8.3 IP Multicast...................................................................................................................................................................84
8.3.1 Multicast Traffic Cannot Be Transmitted..................................................................................................................84
8.3.1.1 Common Causes.....................................................................................................................................................84
8.3.1.2 Troubleshooting Flowchart.....................................................................................................................................84
8.3.1.3 Troubleshooting Procedure.....................................................................................................................................85
8.3.1.4 Relevant Alarms and Logs.....................................................................................................................................86
8.3.2 The PIMNeighbor Relationship Remains Down......................................................................................................86
8.3.2.1 Common Causes.....................................................................................................................................................86
8.3.2.2 Troubleshooting Flowchart.....................................................................................................................................87
8.3.2.3 Troubleshooting Procedure.....................................................................................................................................88
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8.3.2.4 Relevant Alarms and Logs.....................................................................................................................................89
8.3.3 MSDP Peers Cannot Generate Correct (S, G) Entries...............................................................................................89
8.3.3.1 Common Causes.....................................................................................................................................................89
8.3.3.2 Troubleshooting Flowchart.....................................................................................................................................89
8.3.3.3 Troubleshooting Procedure.....................................................................................................................................91
8.3.3.4 Relevant Alarms and Logs.....................................................................................................................................93
8.4 QoS...............................................................................................................................................................................93
8.4.1 Priority Mapping Troubleshooting............................................................................................................................93
8.4.1.1 Packets Enter Incorrect Queues..............................................................................................................................93
8.4.1.1.1 Common Causes..................................................................................................................................................94
8.4.1.1.2 Troubleshooting Flowchart..................................................................................................................................94
8.4.1.1.3 Troubleshooting Procedure..................................................................................................................................96
8.4.1.1.4 Relevant Alarms and Logs..................................................................................................................................97
8.4.1.2 Priority Mapping Results Are Incorrect.................................................................................................................97
8.4.1.2.1 Common Causes..................................................................................................................................................97
8.4.1.2.2 Troubleshooting Flowchart..................................................................................................................................98
8.4.1.2.3 Troubleshooting Procedure..................................................................................................................................99
8.4.1.2.4 Relevant Alarms and Logs................................................................................................................................100
8.4.2 Traffic Policing Troubleshooting............................................................................................................................100
8.4.2.1 Interface-based Traffic Policing Results Are Incorrect........................................................................................100
8.4.2.1.1 Common Causes................................................................................................................................................100
8.4.2.1.2 Troubleshooting Flowchart................................................................................................................................100
8.4.2.1.3 Troubleshooting Procedure................................................................................................................................101
8.4.2.1.4 Relevant Alarms and Logs................................................................................................................................102
8.4.3 Traffic Shaping Troubleshooting.............................................................................................................................102
8.4.3.1 TrafficShaping Results of Queues Are Incorrect.................................................................................................102
8.4.3.1.1 Common Causes................................................................................................................................................102
8.4.3.1.2 Troubleshooting Flowchart................................................................................................................................103
8.4.3.1.3 Troubleshooting Procedure................................................................................................................................105
8.4.3.1.4 Relevant Alarms and Logs................................................................................................................................107
8.4.4 Congestion Avoidance Troubleshooting.................................................................................................................107
8.4.4.1 Congestion Avoidance Fails to Take Effect.........................................................................................................107
8.4.4.1.1 Common Causes................................................................................................................................................107
8.4.4.1.2 Troubleshooting Flowchart................................................................................................................................107
8.4.4.1.3 Troubleshooting Procedure................................................................................................................................109
8.4.4.1.4 Relevant Alarms and Logs................................................................................................................................110
8.4.5 Congestion Management Troubleshooting..............................................................................................................110
8.4.5.1 Congestion Management Fails to Take Effect.....................................................................................................111
8.4.5.1.1 Common Causes................................................................................................................................................111
8.4.5.1.2 Troubleshooting Flowchart................................................................................................................................111
8.4.5.1.3 Troubleshooting Procedure................................................................................................................................112
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8.4.5.1.4 Relevant Alarms and Logs................................................................................................................................113
8.5 Device Management...................................................................................................................................................113
8.5.1 Stacking Troubleshooting........................................................................................................................................114
8.5.1.1 A Stack Failed to Be Set Up.................................................................................................................................114
8.5.1.1.1 Common Causes................................................................................................................................................114
8.5.1.1.2 Troubleshooting Flowchart................................................................................................................................114
8.5.1.1.3 Troubleshooting Procedure................................................................................................................................115
8.5.1.1.4 Relevant Alarms and Logs................................................................................................................................116
8.5.1.2 Active/Standby Switchover Cannot Be Performed in a Stack.............................................................................116
8.5.1.2.1 Common Causes................................................................................................................................................117
8.5.1.2.2 Troubleshooting Flowchart................................................................................................................................117
8.5.1.2.3 Troubleshooting Procedure................................................................................................................................117
8.5.1.2.4 Relevant Alarms and Logs................................................................................................................................117
8.6 TRILL.........................................................................................................................................................................118
8.6.1 TRILLNeighbor Relationship Fails to Be Established...........................................................................................118
8.6.1.1 Common Causes...................................................................................................................................................118
8.6.1.2 Troubleshooting Flowchart...................................................................................................................................118
8.6.1.3 Troubleshooting Procedure...................................................................................................................................119
8.6.1.4 Relevant Alarms and Logs...................................................................................................................................122
8.6.2 TRILL Traffic Failed to Be Forwarded...................................................................................................................122
8.6.2.1 Common Causes...................................................................................................................................................122
8.6.2.2 Troubleshooting Flowchart...................................................................................................................................123
8.6.2.3 Troubleshooting Procedure...................................................................................................................................124
8.6.2.4 Relevant Alarms and Logs...................................................................................................................................125
8.6.3 TRILL In-band NMS Fails to Manage RBs............................................................................................................125
8.6.3.1 Common Causes...................................................................................................................................................125
8.6.3.2 Troubleshooting Flowchart...................................................................................................................................126
8.6.3.3 Troubleshooting Procedure...................................................................................................................................126
8.6.3.4 Relevant Alarms and Logs...................................................................................................................................127
8.6.4 TRILL Fails to Be Enabled on an Interface.............................................................................................................127
8.6.4.1 Common Causes...................................................................................................................................................128
8.6.4.2 Troubleshooting Flowchart...................................................................................................................................128
8.6.4.3 Troubleshooting Procedure...................................................................................................................................128
8.6.4.4 Relevant Alarms and Logs...................................................................................................................................129
9 Common Fault Diagnostic Commands.................................................................................130
9.1 display Commands.....................................................................................................................................................131
9.1.1 Overview.................................................................................................................................................................131
9.1.2 Regular Expression in display Commands..............................................................................................................131
9.1.3 Common display Commands...................................................................................................................................135
9.2 reset Commands.........................................................................................................................................................137
9.2.1 Overview.................................................................................................................................................................137
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9.2.2 reset Commands Clearing Packet Statistics.............................................................................................................137
9.2.3 Using reset Commands............................................................................................................................................138
9.3 Ping and Tracert..........................................................................................................................................................138
9.4 Traps...........................................................................................................................................................................141
9.5 Logs............................................................................................................................................................................143
9.6 Packet Header Capturing Function.............................................................................................................................143
10 Appendix: Indicators.............................................................................................................. 147
10.1 Fan Module Indicator...............................................................................................................................................148
10.2 Power Indicators.......................................................................................................................................................149
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1Instructions for Maintenance EngineersAbout This Chapter
1.1 Precautions
1.2 Backing Up Data
1.3 Troubleshooting Process
1.4 Ask for Help
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1.1 Precautions
If you are a maintenance engineer, read the following precautions before doing your work:
l Confirm whether the fault is an emergency fault. If it is an emergency fault, recover the
faulty module by using the pre-defined troubleshooting methods immediately, and then
restore services.
l Strictly conform to operation rules and industrial safety standards, ensuring human and
device safety.
l Wear the ESD wrist strap when touching device components.
l Record original information about the problems occurring during troubleshooting.
l Record all the operations you have performed, especially the key operations such as
restarting device and clearing database. Before performing the key operations, confirm theoperation feasibility, back up data, and prepare the emergency and security measures. Only
qualified personnel can perform key operations.
NOTE
After commands are configured to troubleshoot faults, pay attention to the configuration validation mode
to ensure that the configurations take effect. Unless otherwise specified, this manual defaults to the
immediate validation mode.
l In immediate validation mode, configurations take effect after commands are input and the Enter key
is pressed.
l In two-phase validation mode, after commands are configured, the commitcommand needs to be run
to commit the configurations.
Saving the results of each troubleshooting step is recommended. If your troubleshooting fails to correct
the fault, you will have a record of your actions to provide Huawei technical support personnel.
1.2 Backing Up Data
Some faults cause resource or money loss for customers. Therefore, maintenance engineers
should focus on preventing faults and quickly restoring faults. Data backup helps you quickly
locate and recover faults. After a network is set up and operates normally, you should back up
important data as soon as possible.
Important data includes:
l Complete network topology, including device models, versions, and networking diagram
l Configuration files and license files
l System software and patch files
l (Optional) Logs
l (Optional) Feature library
1.3 Troubleshooting Process
Systematic troubleshooting is to find fault causes step by step, and finally recover the fault.
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Generally, troubleshooting steps include observing fault symptom, collecting information,
analyzing problem, and finding the root cause. The possible causes of all faults can be grouped
into multiple cause sets, which make troubleshooting easier.
1.4 Ask for Help
1.4.1 Huawei Enterprise Website
At http://support.huawei.com/enterprise, you can:
l Search troubleshooting cases to find a way to fix your problem.
l Post your question on BBS and wait for answers from online technical experts.
1.4.2 Hotline
If you cannot recover the fault, you can:
l Contact the agent.
NOTE
Provide device and fault information to technical support personnel.
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2Forgetting PasswordsAbout This Chapter
This section describes how to recover the console port and Telnet passwords. You are advised
to keep passwords secure and change them regularly.
2.1 Recovering the Console Port Password
2.2 Recovering the Telnet Login Password
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2.1 Recovering the Console Port Password
Three methods are provided to recover the console port password.
l Method 1: Log in to the device using Telnet and change the console port password.
l Method 2: Change the console port password through the BIOS menu.
NOTE
Method 1 is recommended. If you forget the Telnet password, use method 2.
Logging In to the Device Using Telnet and Modifying the Console Port Password
If you can log in to the device using Telnet and your user right is level 3 or higher, log in to the
device using Telnet, change the console port password, and save the configuration.
1. Log in to the device using Telnet. Ensure that your user right is level 3 or higher.
Run the display userscommand to display all the users that have logged into the device.
The item with a "+" mark indicates your user account on user interface VTY1.
display users User-Intf Delay Type Network Address AuthenStatusAuthorcmdFlag 34 VTY 0 00:06:53 TEL 10.135.18.67 pass yesUsername : Unspecified
+ 35 VTY 1 00:00:00 TEL 10.135.18.91 pass yesUsername : Unspecified
36 VTY 2 00:08:11 TEL 10.135.18.54 pass yesUsername : Unspecified
Run the display user-interfacecommand to view the user right of all users. VTY1 has a
corresponding user right 15; therefore, you have the right to change the console port
password.
display user-interface Idx Type Tx/Rx Modem Privi ActualPrivi Auth Int0 CON 0 9600 - 15 - P -
+ 34 VTY 0 - 15 15 P -+ 35 VTY 1 - 15 15 P -+ 36 VTY 2 - 15 - P -37 VTY 3 - 15 15 P -
......
2. Change the console port password. In this example, you set the authentication mode topassword authentication.
system-view[~HUAWEI] user-interface console 0[~HUAWEI-ui-console0] authentication-mode passwordPlease configure the login password (6-16)Enter Password:Confirm Password:[~HUAWEI-ui-console0] user privilege level 15[~HUAWEI-ui-console0] commit[~HUAWEI-ui-console0] return
3. Save the configuration to prevent configuration loss after a restart.
save
Warning: The current configuration will be written to the device.Are you sure to continue? [Y/N]:y
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Now saving the current configuration to the slot 1Info: Save the configuration successfully.
Modifying the Console Port Password Through the BIOS Menu
The BIOS allows you to clear the console port password so that the device does not check the
password when you log in through the console port. Then the device restarts, enters the command
line interface, and prompts you to change the console port password.
CAUTION
l You must restart the device to display the BIOS menu, which results in service interruption.
Migrate services to a backup device and perform this operation in off-peak hours.
l Set a new password immediately after you log in to the device by clearing console login
password. Otherwise, you must repeat this operation when the login expires or the devicerestarts.
l Do not power off the device during the operation.
1. Connect a PC to the device with a serial cable and restart the device. When the message
"Press CTRL+B to enter BIOS menu" is displayed, press Ctrl+Band enter the BIOS
password ([email protected] default) to display the BIOS main menu.
2. Clear console login password.
BIOS Menu (Version: 126)
1. Continue to boot 2. Update from serial interface 3. Update from ethernet interface 4. Modify startup parameters 5. File system 6. Modify BIOS password 7. Modify console password 8. Reboot
Enter your choice(1-7): 7
Caution: A new console password must be set after the restart.Continue now? Yes(y) or No(n): y
3. After the system starts, authentication is not required when logging in to the device through
the console port, but you need to change the console port password in time. In this example,you set the authentication mode to password authentication.
system-view[~HUAWEI] user-interface console 0[~HUAWEI-ui-console0] authentication-mode passwordPlease configure the login password (6-16)Enter Password:Confirm Password:[~HUAWEI-ui-console0] user privilege level 15[~HUAWEI-ui-console0] commit[~HUAWEI-ui-console0] return
4. Save the configuration.
save
Warning: The current configuration will be written to the device.Are you sure to continue? [Y/N]:y
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Now saving the current configuration to the slot 1Info: Save the configuration successfully.
2.2 Recovering the Telnet Login Password
You can use Telnet to remotely maintain and manage a device. If you forget the Telnet login
password, log in to the device using the console port and set a new password.
Currently, the device supports two authentication modes for Telnet login.
l AAA authentication: To log in to the device, you must have a user name and a password.
l Password authentication: To log in to the device, you must have a password.
In this example, the configurations for VTY0 to VTY4 are the same.
NOTE
After you log in to the device, run the display current-configuration configuration user-interfacecommand to view the authentication mode of the VTY user. You can change the password without changing
the authentication mode or configure a new authentication mode.
AAA Authentication system-view[~HUAWEI] user-interface vty 0 4[~HUAWEI-ui-vty0-4] authentication-mode aaa[~HUAWEI-ui-vty0-4] quit[~HUAWEI] aaa[~HUAWEI-aaa] local-user huawei password irreversible-cipher huawei@123[~HUAWEI-aaa] local-user huawei service-type telnet[~HUAWEI-aaa] local-user huawei level 15
[~HUAWEI-aaa] commit[~HUAWEI-aaa] return saveWarning: The current configuration will be written to the device.Are you sure to continue? [Y/N]:yNow saving the current configuration to the slot 1Info: Save the configuration successfully.
After the configuration is complete, you can use the user name huaweiand password
huawei@123to log in to the device.
Password Authentication system-view
[~HUAWEI] user-interface vty 0 4[~HUAWEI-ui-vty0-4] authentication-mode passwordPlease configure the login password (6-16)Enter Password:Confirm Password:[~HUAWEI-ui-vty0-4] user privilege level 15[~HUAWEI-ui-vty0-4] commit[~HUAWEI-ui-vty0-4] return saveWarning: The current configuration will be written to the device.Are you sure to continue? [Y/N]:yNow saving the current configuration to the slot 1Info: Save the configuration successfully.
After the configuration is complete, you can use the password huawei@123to log in to the
device.
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3Information CollectionAbout This Chapter
This chapter describes the information collection method. You must collect detailed fault
information before locating faults by yourself or contacting agents or Huawei technical support
personnel for fault location.
NOTE
If you need to send fault information to agents or Huawei technical support personnel for fault location,
delete security information such as network configurations before sending the fault information.
3.1 Overview
3.2 Collecting Diagnostic Information
3.3 Health Status Information
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3.1 Overview
After a device fault occurs, collect fault information immediately. This helps you locate the faultaccurately.
If you cannot locate the fault by yourself, provide the following information to agents or Huawei
technical support personnel:
l Fault occurrence time, network topology, operations triggering the fault, fault symptom,
measures that you have taken and results, and affected services
l Name, version, current configurations, interfaces of the faulty device. For the method of
obtaining these information, see 3.2 Collecting Diagnostic Informationand 9.1.3
Common display Commands.
l Logs generated when the fault occurs. For the method of obtaining the log information, see
Collecting Log Information.
3.2 Collecting Diagnostic Information
The display diagnostic-information[ [ module-name] & [ slotslot-id] |file-name]
command displays the device diagnostic information on screen or outputs the information to a
txt file. The device diagnostic information includes startup configuration, current configurations,
interface information, time, and system version. The following is an example:
display diagnostic-information dia-info.txtNow saving the diagnostic information to the device.............................
................................................................................
..............Info: The diagnostic information was saved to the device successfully.
The default storage path is the root directory of the system default storage device: flash:/. Using
the dircommand in the user view can confirm file generation.
After a device becomes faulty, provide the device diagnostic information to agents or Huawei
technical support personnel immediately for fast fault location. For the method of transmitting
the diagnostic information from the device to your computer, see 4.4 Transferring Files Using
FTP/TFTP.
NOTE
l Executing this command requires a long time. You can press Ctrl+Cto pause diagnosis information
display on screen.
l When a large amount of diagnostic information is displayed, the CPU usage may be high in a short
period.
3.3 Health Status Information
The device provides the display healthcommand. You can run the command to check the health
status information, including the temperature, power supply, fan, CPU usage, memory usage,
and storage medium usage of the device. The following is an example:
display health
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4System Maintenance MethodsAbout This Chapter
This section describes how to restore default settings, restart a device, and transfer files.
4.1 Restoring the Default Settings Using the Configuration File
4.2 Restarting the Device
4.3 Upgrading the Device
4.4 Transferring Files Using FTP/TFTP
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4.1 Restoring the Default Settings Using the Configuration
FileWhen the device is powered on, it reads the configuration file from the default directory for
initialization. Therefore, the configuration in the file is called the initial configuration. If no
configuration file is stored in the default directory, the device uses the default parameters for
initialization. You must restart the device to make the recovered default settings take effect.
1. Restore the configuration file using the FTP/TFTP server.
For detailed operations, see Using FTP/TFTP to Transfer Files. Download the default
configuration file to the device.
2. Run the startup saved-configurationcommand to specify the default configuration file
for the next startup and restore the default settings.
startup saved-configuration config.zip reboot fast
NOTE
When restoring the default settings, do not save the configuration. Otherwise, the device starts up
using the current configuration.
4.2 Restarting the Device
Some network faults will be rectified after you restart the device. This section describes how to
restart a device.
You can restart the device using any of the methods in the following table.
Table 4-1Device restart methods
Method Description
Turn off and then turn on the power switch to
restart the device.
Cold restart is performed manually. In cold
restart, a device can be restarted only by
pressing the power button, which has
limitations and is applicable to onsite
maintenance.Save the configurations in real time because
the device will restart directly without saving
the current configuration.
Run the rebootcommand in the user view to
restart the device.
Hot restart uses commands, which is adopted
by maintenance personnel who remotely
manages the device.
In restart, the system asks whether to save the
configuration, which effectively prevents
configuration loss.
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4.3 Upgrading the Device
The upgrade of a device is closely related to the released software versions. The corresponding
upgrade guide is released with each new version and you can upgrade the device according to
the guide. To obtain the upgrade guides, visit http://support.huawei.com/enterprise, choose
Software> Product Software> Enterprise Networking> Switch> Data Center Switch,
and download the upgrade guide based on the product name and version.
4.4 Transferring Files Using FTP/TFTP
During system maintenance such as software upgrade and configuration file backup, files must
be transferred between a PC and the device. FTP/TFTP is used to transfer files.
When transferring files using FTP/TFTP, the roles of PC and device vary in different methods:
l PC functioning as an FTP server: You must install the FTP server software on your PC.
l PC functioning as a TFTP server: You must install the TFTP server software on your
PC. TFTP is easy to configure but this method has low security and transmission speed.
l Device functioning as an FTP server: You can perform configurations on the device
without installing any software. When there are a large number of devices on a network,
the first two methods are recommended.
PC Functioning as an FTP Server
Figure 4-1Networking diagram
FTP Client FTP Server
192.168.0.2/24192.168.0.1/24
MEth0/0/0
1. Run the FTP server software on the FTP server and configure the FTP service. For details,
see relevant help documentation.
2. Connect the device and the FTP server. (The IP addresses are used as an example.)
a. Connect the FTP server to MEth0/0/0 of the device using a network cable.
b. Configure an IP address 192.168.0.1/24 for MEth0/0/0.
c. Configure an IP address 192.168.0.2/24 forthe FTP server.
system-view[~HUAWEI] interface meth 0/0/0[~HUAWEI-MEth0/0/0] ip address 192.168.0.1 24[~HUAWEI-MEth0/0/0] commit[~HUAWEI-MEth0/0/0]ping 192.168.0.2 PING 192.168.0.2: 56 data bytes, press CTRL_C to break Reply from 192.168.0.2: bytes=56 Sequence=1 ttl=128 time=4 ms Reply from 192.168.0.2: bytes=56 Sequence=2 ttl=128 time=3 ms Reply from 192.168.0.2: bytes=56 Sequence=3 ttl=128 time=18 ms Reply from 192.168.0.2: bytes=56 Sequence=4 ttl=128 time=3 ms Reply from 192.168.0.2: bytes=56 Sequence=5 ttl=128 time=3 ms
--- 192.168.0.2 ping statistics ---
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5 packet(s) transmitted 5 packet(s) received 0.00% packet loss round-trip min/avg/max = 3/6/18 ms
[~HUAWEI-MEth0/0/0] return
NOTE
l In this example, the FTP server and the device are directly connected. If they are not directly
connected, you must ensure that they have reachable routes to each other.
l After the configuration is complete, run the pingcommand to test the connectivity between the
FTP server and device.
3. Log in to the FTP server using FTP.
ftp 192.168.0.2Trying 192.168.0.2 ...Press CTRL + K to abortConnected to 192.168.0.2.220 FTP Server ready.
User(192.168.0.2:(none)):ftpuser
331 Password required for ftpuser.Enter password:230 User logged in.
[ftp]
4. Run the putcommand to upload files to the FTP server or run the getcommand to download
files from the FTP server to the device.
[ftp]put vrpcfg.zip200 Port command okay.150 Opening ASCII mode data connection for /vrpcfg.zip./ 100% [***********]226 Transfer complete.FTP: 1098 byte(s) sent in 0.131 second(s) 8.38Kbyte(s)/sec.
[ftp]binary200 Type set to I.[ftp] get devicesoft.cc200 Port command okay.150 Opening BINARY mode data connection for /devicesoft.cc.\ 6482944 bytes transferred226 Transfer complete.FTP: 6482944 byte(s) received in 54.500 second(s) 1117.40Kbyte(s)/sec.[ftp]
PC Functioning as a TFTP Server
Figure 4-2Networking diagram
TFTP Client TFTP Server
192.168.0.2/24192.168.0.1/24
MEth0/0/0
1. Run the TFTP server software on the TFTP server (PC) and configure the TFTP service.
For details, see relevant help documentation.
2. Connect the TFTP server and the device and configure IP addresses for them. For details,
see PC Functioning as an FTP Server.
3. Run the tftp putcommand to upload files to the TFTP server or run the tftp getcommand
to download files from the TFTP server to the device.
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tftp 192.168.0.2 get vrpcfg.zip vrpcfg1.zipInfo: Transfer file in binary mode.Please wait for a while.../ 8174 bytes transferredInfo: Downloaded the file successfully. tftp 192.168.0.2 put vrpcfg.zip vrpcfg2.zip
Info: Transfer file in binary mode.Please wait for a while.../ 100% [***********]Info: Uploaded the file successfully.
Device Functioning as an FTP Server
Figure 4-3Networking diagram
FTP Server FTP Client
192.168.0.2/24192.168.0.1/24
MEth0/0/0
1. Connect the PC and the device and configure IP addresses for them. For details, see PC
Functioning as an FTP Server.
2. Enable FTP on the device, and create a user name, password, and FTP path.
NOTE
You must set the user level to level 3 or above to establish an FTP connection.
system-view[~HUAWEI] ftp server enable[~HUAWEI] aaa
[~HUAWEI-aaa] local-user huawei password irreversible-cipher huawei@123[~HUAWEI-aaa] local-user huawei service-type ftp[~HUAWEI-aaa] local-user huawei ftp-directory flash:[~HUAWEI-aaa] local-user huawei level 15[~HUAWEI-aaa] commit[~HUAWEI-aaa] quit[~HUAWEI] quit
3. Log in to the device by running the ftpcommand on the FTP server. Run the getcommand
to download files to the FTP server or run the putcommand to upload files from the FTP
server to the device.
For example, on an FTP server with the Windows operating system, choose Start> Run,
enter cmd, and click OK.
C:\Documents and Settings\Administrator> ftp 192.168.0.1Connected to 192.168.0.1.220 FTP service ready.User (192.168.0.1:(none)): huawei331 Password required for huawei.Password:230 User logged in.ftp> get vrpcfg.zip200 Port command okay.150 Opening ASCII mode data connection for vrpcfg.zip.226 Transfer complete.ftp: 5203 bytes received in 0.01Seconds 346.00Kbytes/sec.ftp> lcdLocal directory now C:\Documents and Settings\Administrator.ftp>put vrpcfg.zip
200 Port command okay.150 Opening ASCII mode data connection for vrpcfg.zip.
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226 Transfer complete.ftp: 5203 bytes sent in 0.01Seconds 346.87Kbytes/sec
NOTE
If you use the user name Administratorto log in to the PC, the output differs from the above.
You can run the lcdcommand to view the path where backup configuration files are saved.
The commands vary with the operating system. For details, see relevant help documentation of each
operating system.
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5Startup FailuresAbout This Chapter
This section describes how to troubleshoot device startup failures.
5.1 Terminal Does Not Display Anything Or Displays Garbled Characters
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5.1 Terminal Does Not Display Anything Or Displays
Garbled CharactersFault Description
After a terminal connecting to a router starts, it cannot display anything or displays garbled
characters.
Possible Cause
l The power module of the router is faulty or the router is not powered on.
l The serial interface connecting to the router is incorrectly configured.
l The cable between the terminal and router is faulty or not firmly connected to the serial
interface.
Troubleshooting Roadmap
l Check the power indicator on the router's front panel to ensure that the power module is
working properly.
l Ensure that the serial interface is correctly configured.
l Install the cable firmly or replace the cable.
Troubleshooting Procedure
1. Check the power indicator on the router's front panel. If the power indicator is On, the
power module is working properly. If the power indicator is Off, rectify the fault according
to Power Module Troubleshooting.
2. Check whether the combo interface type is correct and whether the physical attributes of
the PC is consistent with those of the serial interface. The default parameters are as follows:
l Baud rate: 9600
l Data bit: 8
l Stop bit: 1
l Parity check: None
lFlow control: None
3. Ensure that the cable is firmly connected to the serial interface. You can replace it with a
new cable to verify whether the cable is faulty.
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6HardwareAbout This Chapter
6.1 Power Module Troubleshooting
6.2 Fan Module Troubleshooting
6.3 Optical Module Troubleshooting
6.4 Interface Troubleshooting
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6.1 Power Module Troubleshooting
6.1.1 The SYS and Power Module Indicators Are Off
Fault Description
The SYS indicator and power module indicators are all off, and the chassis cannot be powered
on.
Possible Causes
l The power modules are turned off.
l
Power cables are not securely connected to the sockets.l The power modules are faulty.
Troubleshooting Procedure
1. Ensure that the power switches on the power modules are turned on.
2. Ensure that the power cables are securely connected to the sockets.
3. Replace the power modules with normal power modules of the same model. If the chassis
is powered on, the original power modules on the chassis are faulty. Send the faulty power
modules to Huawei for repair.
4. If the chassis still fails to be powered on, contact Huawei Technical Assistance Center.
6.2 Fan Module Troubleshooting
6.2.1 The Indicator of a Fan Module Is Steady Red
Fault Description
The indicator of a fan module is steady red.
Possible Causes
l The fan module is not properly installed in the fan slot.
l Fan blades are blocked or stop rotating because of heavy dust.
l The fan module is faulty.
Troubleshooting Procedure
1. Check whether the fan module is securely installed. If not, remove and reinstall the fan
module (hot swappable).
2. Remove the fan module and check whether fan blades are blocked or covered with heavy
dust.
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l If fan blades are blocked by an obstacle, remove the obstacle.
l If fan blades have heavy dust, use a brush to clean fan blades.
3. Install another fan module of the same model into the fan slot. If the new fan module can
work normally, the original fan module has failed.
6.2.2 Fan Noise Is Loud
Fault Description
The device is running properly and no fan alarm is generated; however, the fan noise is loud.
Common Causes
l The fan rotation speed is high.
Troubleshooting Procedure
1. Run the display device fancommand to check the fan rotation speed.
2. If the fan rotation speed is high, run the set fan-speedslotslot-idpercentpercentcommand
to reduce the fan rotation speed. The following is an example:
system-view[~HUAWEI] diagnose[~HUAWEI-diagnose] set fan-speed slot 1 percent 50
CAUTION
Reducing the fan speed may cause the overtemperature of the device. Therefore, use this
command with caution.
3. If the fan noise is still loud after the fan rotation speed is reduced, run the upgrade fan
command to upgrade the fan version. The following is an example:
system-view[~HUAWEI] diagnose[~HUAWEI-diagnose] upgrade fan all
4. If the fault persists, use a new fan module.
6.2.3 An Alarm Is Generated When the Fan Status Is Abnormal
Fault Description
The display devicecommand output shows that the fan status is abnormal.
display deviceDevice status:-----------------------------------------------------------------------------Slot Sub Type Online Power Register Alarm Primary-----------------------------------------------------------------------------1 - CE5850-48T4S2Q-EI Present On Registered Normal Master
FAN2 - Present On Registered AbnormalNA
PWR2 - Present On Registered Normal NA-----------------------------------------------------------------------------
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Common Causes
l The fan is not installed properly.
l Fan blades are blocked or have heavy dust.
Troubleshooting Procedure
1. Check whether the fan is properly installed and whether fan blades are blocked by an
obstacle or have heavy dust. If so, properly install the fan, remove the obstacle, or use a
brush to clean fan blades.
2. Run the upgrade fancommand to upgrade the fan version. The following is an example:
system-view[~HUAWEI] diagnose[~HUAWEI-diagnose] upgrade fan all
3. If the fault persists, use a new fan module.
6.2.4 Fan Blades Were Damaged
Fault Description
The display device alarm hardwarecommand output contains the following fan alarm.
display device alarm hardware--------------------------------------------------------------------------------Index Level Date Time Info--------------------------------------------------------------------------------
1 critical 2013-04-10 03:03:36 The fan partially failed.(FanID=FAN 1,Reason=The first fan failed.)--------------------------------------------------------------------------------
Common Causes
l Fan blades are damaged.
Troubleshooting Procedure
1. Use a new fan module.
6.3 Optical Module Troubleshooting
6.3.1 Optical Modules on the Local and Remote Devices CannotCommunicate
Fault Description
An optical interface of a CE switch is connected to a remote device through an optical fiber. The
two optical interfaces are Down and cannot communicate with each other.
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Possible Causes
l The optical module installed on the optical interface is not a Huawei certified optical
module.
l The optical module type does not match the optical fiber type.
l At least one of the two optical interfaces has been manually shut down.
l The transmit power of the optical module is too low or too high.
l The receive power of the optical module is too low or too high.
Troubleshooting Procedure
1. Check whether a Huawei certified optical module is installed on the optical interface. The
CE series switches must use Huawei certified optical modules. Non-Huawei-certified
optical module cannot ensure service reliability and stability. If a non-Huawei-certified
optical module is used, replace it with a Huawei certified optical module.
2. Check whether the optical module matches the optical fiber. If not, replace the optical fiberor optical module.
l A single-mode optical module (generally with a center wavelength of 1310 nm or 1550
nm) must work with a single-mode optical fiber (generally yellow).
l A multimode optical module (generally with a center wavelength of 850 nm) must work
with a multimode optical fiber (generally orange).
3. Run the display interface transceivercommand to check whether any alarm information
has been generated for the optical module. display interface 10ge 1/0/1 transceiver10GE1/0/1 transceiverinformation:
-------------------------------------------------------------------Common
information:Transceiver Type :
10GBASE_SRConnector
Type :LCWavelength (nm) :
850Transfer Distance (m) :80(50um),30(62.5um),300
(OM3)Digital Diagnostic
Monitoring :YESVendor
Name :AVAGO
Vendor PartNumber :AFBR-703SDZ
OrderingName :-------------------------------------------------------------------Manufacture
information:Manu. Serial
Number :AD1148A07G7Manufacturing Date :
2011-12-05Vendor
Name :AVAGO-------------------------------------------------------------------Alarm information:
LOS Alarm-------------------------------------------------------------------
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If a LOS alarm is displayed, the local optical interface does not receive signals from the
remote interface. Run the display thiscommand in the interface view to check whether the
two interfaces have been manually shut down. If an interface is shut down, run the undo
shutdowncommand on the interface.
4. Run the display interface transceiver verbosecommand to display diagnostic informationabout the optical module on the interface. Check whether the diagnostic information
displays alarms about abnormal transmit or receive power. display interface 10ge 1/0/1 transceiver verbose10GE1/0/1 transceiverinformation:-------------------------------------------------------------------Common
information:Transceiver Type :
10GBASE_SRConnector
Type :LCWavelength (nm) :
850Transfer Distance (m) :80(50um),30(62.5um),300(OM3)
Digital DiagnosticMonitoring :YES
VendorName :AVAGO
Vendor PartNumber :AFBR-703SDZ
OrderingName :-------------------------------------------------------------------Manufacture
information:Manu. Serial
Number :AD1148A07G7Manufacturing Date :2011-12-05
VendorName :AVAGO-------------------------------------------------------------------Alarm information:RxPower Low
-------------------------------------------------------------------Diagnostic
information:Temperature (C) :
34.77Voltage (V) :
3.29
Bias Current (mA) :7.19
Bias High Threshold (mA) :10.50
Bias Low Threshold (mA) :2.50
Current RX Power (dBM) :-40.00Default RX Power High Threshold (dBM) :3.01Default RX Power Low Threshold (dBM) :-15.02Current TX Power (dBM) :-2.57Default TX Power High Threshold (dBM) :3.01Default TX Power Low Threshold (dBM) :-9.00
-------------------------------------------------------------------
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Troubleshooting 6 Hardware
Issue 01 (2013-08-01) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
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The display interface transceiver verbosecommand displays the current transmit and
receive power values of the optical module, as well as the default maximum and minimum
power values.
l If RxPower Lowis displayed, the receive signal strength is too low. The possible reason
is that the remote interface is Down or packets sent from the remote interface are droppedduring transmission. Check whether the distance between the two devices exceeds the
maximum transmission distance of the optical module. If the distance is within the
transmission distance of the optical module, check whether the optical module on the
remote interface or the optical fiber is damaged. If they are damaged, replace them.
l If RxPower Highis displayed, the receive signal strength is too high. The possible
reason is that the distance between the two devices is short but a long-distance optical
module is used. In this case, install an optical attenuator on the optical module to reduce
the transmit power.
l If TxPower Lowis displayed, the transmit signal strength on the local optical module
is too low. This may cause a low receive power on the remote optical module. As a
result, the remote interface cannot turn Up or drops packets sent from the local interface.
l If TxPower Highis displayed, the transmit signal strength on the local optical module
is too high. This may cause a high receive power on the remote optical module. If the
high receives power lasts for a long time, the remote optical module will be burned.
To ensure normal communication between two optical interfaces, check for transmit and
receive power alarms after the two interfaces have optical modules installed and connected
using an optical fiber. Ensure that the transmit and receive power values of the two optical
modules are in the normal range. Otherwise, traffic forwarding on the optical interfaces
may be abnormal or the optical modules may be damaged.
5. If no transmit and receive power alarms are displayed on the two ends but the two interfaces
are still Down, collect detailed information and logs about the optical modules, and thenreplace the optical modules or optical fiber. If the interfaces can turn Up, the original optical
modules or optical fiber has been damaged. If the interfaces are still Down, contact Huawei
Technical Assistance Center.
6.4 Interface Troubleshooting
6.4.1 A 40GE Interface Fails to Be Split into 10GE Interfaces or 10GE
Interfaces Fail to Be Merged into A 40GE Interface
Fault Description
A 40GE interface fails to be split into 10GE interfaces or 10GE interfaces fail to be merged into
a 40GE interface.
Common Causes
l Corresponding commands are not correctly configured.
l The card is not restarted.
CloudEngine 6800&5800 Series Switches
Troubleshooting 6 Hardware
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Troubleshooting Procedure
l A 40GE interface fails to be split into 10GE interfaces.
1. Run the display current-configurationcommand to check whether configuration
information about port splitis available. If not, run the port splitinterfaceinterface-typeinterface-number1[ tointerface-typeinterface-number2] command in the
system view to split the 40GE interface into 10GE interfaces.
2. Run the display port splitcommand to check the current interface status. If the
command output displays the following information, restart the card. display port splitNote:*Enable : Enabled after board reset
*Disable : Disabled after board reset----------------------------------------------------Port Status Split-port----------------------------------------------------40GE4/0/1 *Enable 10GE4/0/49
10GE4/0/5010GE4/0/51
10GE4/0/52----------------------------------------------------
l 10GE interfaces fail to be merged into a 40 GE interface.
1. Run the display current-configurationcommand to check whether configuration
information about port splitis available. If not, run the undo port splitinterface
interface-typeinterface-number1[ tointerface-typeinterface-number2] command in
the system view to merge 10GE interfaces into the 40GE interface.
2. Run the display port splitcommand to check the current interface status. If the
command output displays the following information, restart the card. display port splitNote:*Enable : Enabled after board reset
*Disable : Disabled after board reset----------------------------------------------------Port Status Split-port----------------------------------------------------40GE4/0/3 *Disable 10GE4/0/57
10GE4/0/5810GE4/0/5910GE4/0/60
----------------------------------------------------
6.4.2 An Electrical Interface Cannot Go Up
Fault Description
An electrical interface cannot go up physically. The interface status is as follows:
display interface 10GE1/0/610GE1/0/6 current state : DOWN(ifindex:10)Line protocol current state :DOWN
Description:
Switch Port, PVID : 1, TPID : 8100(Hex), The Maximum Frame Length is9216Internet protocol processing :disabled
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is
CloudEngine 6800&5800 Series Switches
Troubleshooting 6 Hardware
Issue 01 (2013-08-01) Huawei Proprietary and Confidential
Copyright Huawei Technologies Co., Ltd.
25
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8/12/2019 CloudEngine 6800&5800 V100R002C00 Troubleshooting Guide 01.pdf
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0025-9e95-7c10Port Mode: COMMON COPPER, Port Split:-Speed : 10000,Loopback:NONE
Duplex: FULL, Negotiation:ENABLEMdi :AUTO,
Last physical up time :-
Last physical down time : 2013-04-09 16:27:40
Common Causes
l The power cable is faulty.
lNegotiation between the local and remote interfaces fails.
Troubleshooting Procedure
1. Check the cable status. Run the virtual-cable-testcommand in the interface view to check
the cable status. If the cable status is displayed as Openor Shortrather than OK, replace
the cable.
2. Check configurations on the local and remote interfaces.
l If the rem