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RMS-SNMP01B SNMP Card
User Manual

8 Protecting the Server by Using NetShutdown

Issue 10 (2020-03-20)

Copyright © Huawei Technologies Co., Ltd.

48

8

Protecting the Server by Using

NetShutdown

8.1 Introduction to NetShutdown

The NetShutdown is part of the NetEco centralized monitoring system. By obtaining UPS
events, NetShutdown deals with events according to the predefined event handling solution,
and provides the functions of executing command files and shutting down the computer or
server. If the UPS faces risks of power supply exceptions, NetShutdown implements the
specified protection measures to protect your computer or server hardware and software
assets.

8.2 Adding NetShutdown Software to the SNMP Card

To manage the UPS by using an SNMP card, apply to the SNMP card system administrator
for management rights and add IP address information of the PC corresponding to
NetShutdown software to the SNMP card access list.

8.3 Obtaining the UPS Status

After NetShutdown is installed on a computer or server and starts, it can obtain the UPS status
and implement computer or server shutdown protection. One UPS system can support a
maximum of 16 pieces of NetShutdown software. For details about how NetShutdown
manages the UPS status, see the product documentation related to NetShutdown
V100R002C00.

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Содержание RMS-SNMP01B

Страница 1: ...RMS SNMP01B SNMP Card User Manual Issue 10 Date 2020 03 20 HUAWEI TECHNOLOGIES CO LTD ...

Страница 2: ...tomer 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 c...

Страница 3: ...s short for uninterruptible power system Intended Audience This document is intended for Sales engineer Technical support engineer System engineer Hardware installation engineer Commissioning engineer Data configuration engineer Maintenance engineer Symbol Conventions The symbols that may be found in this document are defined as follows Symbol Description Indicates a hazard with a high level of ri...

Страница 4: ...ation Change History Changes between document issues are cumulative The latest document issue contains all the changes made in earlier issues Issue 10 2020 03 20 Modified 2 1 Functions Issue 09 2019 12 20 Updated the safety information Issue 08 2019 11 26 Updated the SNMP version description Issue 07 2019 07 29 Deleted the Modbus TCP feature Issue 06 2016 12 15 The software version has been update...

Страница 5: ...MS SNMP01B SNMP Card User Manual About This Document Issue 10 2020 03 20 Copyright Huawei Technologies Co Ltd iv Issue 02 2015 05 10 The software is upgraded Issue 01 2014 10 27 This is the first release ...

Страница 6: ...sor 6 3 4 2 External Dry Contact Card 7 4 Managing the UPS on the WebUI 9 4 1 Introduction to Web Pages 9 4 2 Preparations for Login 10 4 2 1 Installing an HTTPS Certificate for the Web Browser 10 4 2 2 Setting Internet Explorer Options 13 4 2 3 Privacy Statement 15 4 3 WebUI Login 16 4 4 Monitoring Page 17 4 4 1 Monitoring and Active Alarms Page 17 4 4 2 Real Time Data Page 19 4 4 3 Param Setting...

Страница 7: ...lying for Access Rights 46 6 3 2 Managing the UPS 46 7 Managing the UPS by Using the NMS Complying with RFC1628 Standard 47 7 1 Installing the UPS MIB Library 47 7 2 Managing the UPS by Using the NMS 47 7 2 1 Applying for Access Rights 47 7 2 2 Managing the UPS 47 8 Protecting the Server by Using NetShutdown 48 8 1 Introduction to NetShutdown 48 8 2 Adding NetShutdown Software to the SNMP Card 48 ...

Страница 8: ... 6 2 User Mgmt Page 4 Change the preset password in your first login to the SNMP card over Secure Shell SSH For details see chapter 12 2 Changing an Authentication Password 5 Change the user account password regularly You are suggested to change the password every six months 6 Exercise caution when manually shutting down the UPS inverter for transferring to bypass mode or when adjusting the UPS ou...

Страница 9: ...web browsers include Internet Explorer 8 Internet Explorer 9 Internet Explorer 10 Internet Explorer 11 Firefox 33 1 and Chrome 39 0 2171 71 Provides an access security mechanism assigns rights to users based on roles and implements IP address control over HTTPS SNMPv3 and SNMP access to prevent unauthorized access Provides comprehensive UPS management such as producing an energy flow diagram displ...

Страница 10: ...network port 10 100BASE T The SNMP Ethernet network port is an RJ45 port It communicates with the 10 Mbit s or 100 Mbit s Ethernet over a standard network cable The indicators show the communication status Table 2 1 describes the ports and indicators Table 2 1 Description of ports and indicators Name Indicator Description Ethernet network port Green indicator Off No network cable is connected Stea...

Страница 11: ...e and humidity sensor use Modbus protocol without reference to the access authentication mechanism The SNMP card equipped with a temperature and humidity sensor can monitor the temperature and humidity over an RS485 bus Table 2 2 lists the port definition Table 2 2 Port to a temperature and humidity sensor Port Pin No Signal Port Type CNRJ2 1 RS485 A RJ45 2 RS485 B 3 12V_OUT 4 RS485 A 5 RS485 B 6 ...

Страница 12: ...ith SNMP card Network cable RJ45 connectors on both ends Phillips screwdriver Electrostatic discharge ESD gloves 3 2 Precautions The SNMP card supports hot swap the SNMP card does not support hot swap when it is equipped with a temperature and humidity sensor but temperature and humidity sensors do not Some electronic components in the SNMP card are sensitive to ESD Do not use your hands or electr...

Страница 13: ...or the method about how to connect the other end of the cable see the user manual related to the temperature and humidity sensor Step 4 Connect one end of the network cable to the Ethernet network port on the SNMP card and the other end to an Ethernet port If the green indicator turns on and the yellow indicator blinks the SNMP card is successfully installed and is properly communicating with the ...

Страница 14: ...configured for the SNMP card You are advised to configure an external dry contact card of the model RMS RELAY02B Figure 3 3 External dry contact card 1 External dry contact card 2 RUN indicator 3 ALM indicator 4 RS485_IN port 5 RS485_OUT port 6 Dry contact 7 Reset button 8 Dual in line package DIP switch 9 Wall mounted base The external dry contact card connects to the UPS over an SNMP card Figure...

Страница 15: ...rature and humidity sensor and an external dry contact card at the same time Figure 3 4 Connecting cables to the external dry contact card Refer to the external dry contact card user manual and set the card address to 8 Figure 3 5shows the DIP switch status of the RMS RELAY02B 1 is set to ON and other toggle switches are set to OFF The baud rate is set to 9600 Figure 3 5 DIP switch ...

Страница 16: ...r shut down the UPS Query page The Logs page allows you to query users operation information to know recent operations The Performance Data page displays the performance data of UPS You can query and export the performance data of a selected UPS The Historical Alarms page displays alarms of UPS You can query and export the historical alarms of the selected UPS Config page The Comm Config page allo...

Страница 17: ...mance data and historical alarms of UPS The Upgrade page allows you to upgrade the SNMP card software 4 2 Preparations for Login 4 2 1 Installing an HTTPS Certificate for the Web Browser Open the web browser Internet Explorer 11 In the address box enter the SNMP card IP address to open the login page If the SNMP card IP address is not changed enter https 192 168 0 10 When you access a web server o...

Страница 18: ...n Figure 4 2 The dialog box providing the Certificate is displayed as shown in Figure 4 3 Figure 4 3 Certificate dialog box You can identify the cause of the following certificate error messages according to Figure 4 3 The security certificate presented by this website was not issued by a certificate authority The security certificate presented by this website has expired or is not yet valid ...

Страница 19: ...llows Click Install Certificate as shown in Figure 4 3 Choose Place all certificates in the following store and install the certificate in the Trusted Root Certification Authorities folder as shown in Figure 4 4 Figure 4 4 Install Certificate dialog box 2 The following are two methods to address the The security certificate presented by this website has expired or is not yet valid problem Method 1...

Страница 20: ...Managing the UPS on the WebUI Issue 10 2020 03 20 Copyright Huawei Technologies Co Ltd 13 Figure 4 5 Setting Internet options 4 2 2 Setting Internet Explorer Options Choose Internet Options Advanced and set options as shown in Figure 4 6 ...

Страница 21: ... 2 is selected in Internet Explorer 8 or Internet Explorer 9 web pages cannot be accessed If Internet Explorer 10 or Internet Explorer 11 needs to be used to access web pages you must add the compatibility view settings Choose Page Compatibility View Settings and add the SNMP card IP address If the SNMP card IP address is not changed add 192 168 0 10 as shown in Figure 4 7 ...

Страница 22: ...approval from the customer anonymize the user information in accordance with national or local legal requirements and delete recorded files after the fault locating is complete The UPS2000 system logs email sending function may involve system or personal information Log To facilitate fault location the UPS2000 system may record the following information in logs detailed data exchange and processin...

Страница 23: ...r address and enable this function When using the preceding functions you are obligated to take considerable measures in compliance with the laws of the countries concerned and the user privacy policies of your company to ensure that the personal data of users is fully protected For example you need to anonymize user personal information and delete source files in time 4 3 WebUI Login Procedure St...

Страница 24: ...rowses system running information without permission to perform any system changes There is no verification code on the login page by default After three login failures a verification code is required If you enter incorrect passwords for five consecutive times your account is locked for 1 hour Step 3 Click Login The Monitoring page is displayed as shown in Figure 4 9 End 4 4 Monitoring Page 4 4 1 ...

Страница 25: ...Maintenance 3 Alarm quantity display area Displays the number of active alarms including critical alarms major alarms minor alarms and warning 4 UPS running diagram Shows the UPS running information including input and output parameters battery parameters power flow environment parameters and working mode 5 UPS information area Provides four pages Active Alarms Real Time Data Param Settings and Co...

Страница 26: ...uency load ratio power battery voltage current temperature and backup time Figure 4 10 is shown in the UPS running diagram Figure 4 10 Real time data UPS 4 4 3 Param Settings Page In the UPS information area choose Param Settings Alarm Settings you can set the high and low temperature and humidity alarm thresholds as shown in Figure 4 11 If you click a text box the value range is displayed Enter a...

Страница 27: ...ault parameter values and value ranges Parameter Default Value Value Range Overtemperature threshold 40 C 30 60 C Undertemperature threshold 0 C 30º C to 10 C Overhumidity threshold 90 RH 70 100 RH Underhumidity threshold 10 RH 0 40 RH 4 4 4 Control Page In the UPS information area choose Control System Commands and Tests and you can start or shut down the UPS as shown in Figure 4 12 ...

Страница 28: ...ng the UPS on the WebUI Issue 10 2020 03 20 Copyright Huawei Technologies Co Ltd 21 Figure 4 12 Control page 4 5 Query Page 4 5 1 Logs The Logs page provides user operation information as shown in Figure 4 13 It lists a maximum of 1000 records ...

Страница 29: ...output voltage current frequency and load ratio information Select Performance Data in the Query at the first menu level to enter the performance statistics page as shown in Figure 4 14 Figure 4 14 Performance Data page Select the device set the start time end time and click Query The page then displays the performance data in the specified time period for the selected UPS The time interval is con...

Страница 30: ...he menu at the first level Then you can query historical alarms in a specified time period as shown in Figure 4 16 Figure 4 16 Historical Alarms page Select an alarm severity critical major minor or warning select the device set the start time and end time and click Query The page displays historical alarms in the specified time period for the selected UPS as shown in Figure 4 17 Figure 4 17 Histo...

Страница 31: ...SNMP card is displayed You can select DHCP and click Submit to apply for a dynamic IP address to the DHCP server After that log in to the WebUI using the newly applied IP address If you select When the IP address is automatically assigned send an email the SNMP card will send an email to you to notify the IP address change You are advised to select When the IP address is automatically assigned sen...

Страница 32: ...d the alarm information will be sent to the receivers mailboxes For UPS2000 V200R001C31SPC100 and earlier versions if Yes is selected for Receive periodical email notifications under Alarm Notification Settings before version upgrade and you need scheduled email notification you need to select it again after version upgrade You can delete the sender s email configurations Figure 4 19 Delete the se...

Страница 33: ...f it has not been sent the SNMP card will send it If the SNMP card is powered on between 9 00 and 11 59 the alarm notification will not be sent It will be sent at 12 00 RMS RELAY02B Configurations RMS RELAY02B configurations are used to associate the DI DO status of the external dry contact card and UPS status You can disable the functions of the external dry contact card by disabling RMS RELAY02B...

Страница 34: ... UPS status Name Associated Event UPS Status DO Status DO1 Bypass mode Bypass mode NO and COM pins of DO are closed NC and COM pins of DO are open DO1 Bypass mode Mains mode NC and COM pins of DO are closed NO and COM pins of DO are open Table 4 5 Association between DI status and UPS status Name Type Associated Event DI Status Execute Event or Not DI1 NO Startup There is a 12 24 V DC input Yes DI...

Страница 35: ...languages are available this language is used in the received emails enter an email address receives alarm notifications and choose whether to send a test mail for verifying configurations Click Submit to add the user The user name cannot exceed 20 characters and can contain only uppercase and lowercase letters digits and underscores The password contains 6 to 20 characters and at least two types ...

Страница 36: ...305 protocol to the local time To enable this specify a valid NTP server IP address and click Submit for the setting to take effect as shown in Figure 4 26 The SNMP card can also synchronize time from the NetEco1000U To enable this select a valid NetEco1000U IP address from the address list and click Submit for the setting to take effect as shown in Figure 4 27 You can set System name ups2000 as d...

Страница 37: ... SNMP01B SNMP Card User Manual 4 Managing the UPS on the WebUI Issue 10 2020 03 20 Copyright Huawei Technologies Co Ltd 30 Figure 4 25 Site Config page Figure 4 26 Time synchronization from the NTP server ...

Страница 38: ...nagement 4 6 4 Performance Data Page On the Performance Data page you can set Data recording period to 10s 30s default 1 min 5 min 10 min 15 min 30 min or 60 min as shown in Figure 4 29 Figure 4 29 Performance Data page 4 6 5 SNMP On the SNMP tab you can configure the SNMP version SNMP port SNMPv1 SNMPv2c read and write communities SNMPv3 user and NMS address and permission setting as shown in Fig...

Страница 39: ...his option is selected the NMS needs to connect to the SNMP card through the read and write communities set here When setting the read and write communities for the first time you can directly enter them as shown in Figure 4 32 If the read and write communities have been set before and need to be modified select Modify SNMP community first and modify the read and write communities as shown in Figu...

Страница 40: ...3 User dialog box Before you add a SNMPv3 user set SNMP version to SNMPv3 or ALL When you choose SNMPv1 SNMPv2c to manage the UPS the read community and write community must be the same as those for the SNMP card The read community must be different from the write community Figure 4 32 Page for setting read and write communities for SNMPv1 SNMPv2c ...

Страница 41: ...le which allows a third party NMS complying with Huawei standard to manage the UPS remotely If a third party NMS complying with the RFC1628 standard such as UNMS of Generex is adopted download the UPS RFC1628 MIB file For details about how a third party NMS manages the UPS see 7 Managing the UPS by Using the NMS Complying with RFC1628 Standard If a third party NMS complying with Huawei standard is...

Страница 42: ...e UPS2000 SNMP card integrates the functions of the Generex RCCMD server When the UPS generates an alarm the SNMP card sends a shutdown command or notification message to the RCCMD client The SNMP card configures and saves the address and port for receiving the shutdown command and the message sending mechanism ESN Configuration For a single UPS the ESN of the UPS is displayed on the Config RCCMD ...

Страница 43: ...CMD RCCMD shutdown is Disabled by default as shown in Figure 4 37 If required set it to Enabled upon first login After you submit successfully the page refreshes The controls such as SSL Encrypted Transmission and Client Configuration will be displayed on the page as shown in Figure 4 38 Figure 4 37 RCCMD shutdown disabled Figure 4 38 RCCMD shutdown enabled ...

Страница 44: ... Enabled by default as shown in Figure 4 39 If it is set to Disabled the RCCMD certificate controls will not be displayed on the page as shown in Figure 4 40 If the SSL Encrypted Transmission is set to Disabled a message indicating there is a risk will be displayed Figure 4 39 SSLencrypted transmission enabled by default Figure 4 40 SSLencrypted transmission disabled Event Configuration The SNMP c...

Страница 45: ...tion page No Name Description 1 Button for expanding all You can view all jobs of all events by clicking this button 2 Button for expanding one event You can view all jobs of the event by clicking this button 3 Button for adding one job You can add one job for the event by clicking this button 4 Button for adding one job for events Select multiple events and you can add one job for the selected ev...

Страница 46: ... this button the job will be performed and a message showing test succeeds or fails will be displayed on the page Adding one job for one event Select one event for example Inverter on click the button for adding one job and the page for adding a job for the event is displayed When adding a job the job types to be selected are RCCMD Shutdown RCCMD Message RCCMD Execute and RCCMD TRAP RCCMD Shutdown...

Страница 47: ...client IP address port and message to be conveyed The RCCMD client will receive the message For example enter This is a test message Figure 4 44 RCCMD message RCCMD Execute Specify the RCCMD client IP address port and command to be executed For example enter SHUTDOWN and the RCCMD client will shut down the terminal which is installed with the RCCMD software after receiving the message ...

Страница 48: ...sed on the sending mechanism If you want to define the TRAP message by yourself you can use the TRAP signal to display the UPS information For example if you enter INVOLT the RCCMD client will receive the UPS input voltage value for example single phase 220 three phase A 220 B 220 C 220 Table 4 8 lists the signal names that can be entered Figure 4 46 RCCMD TRAP Table 4 8 RCCMD TRAP signal Signal N...

Страница 49: ... A OUTPHASES Output phases N A When you add a job five sending methods are available The latter three methods can take effect only when event condition is still true after the specified seconds Immediately once After the event happens the job will be sent to the RCCMD client immediately Scheduled in X seconds After the event happens the job will be sent to the RCCMD client once in X seconds No mat...

Страница 50: ...CMD CA certificate can be uploaded as shown in Figure 4 47 If the RCCMD certificate or RCCMD CA certificate is not uploaded the default certificate provided by the system is used for communication After the certificate is uploaded successfully click Submit The SNMP card WebUI will restart and the uploaded certificate will be used for communication Figure 4 47 RCCMD certificate management If the us...

Страница 51: ...ou click the Export button a file download dialog box appears You can open or save the file Figure 4 48 Data Maintenance page 4 7 2 Upgrade Page The Upgrade page allows you to upgrade the SNMP card software On the main menu bar click Maintenance The Upgrade page is displayed as shown in Figure 4 49 Figure 4 49 Upgrade page For details about the upgrade see chapter 11 Upgrading the SNMP Card ...

Страница 52: ... and manage the UPS remotely which improves UPS centralized management and remote operation and maintenance The software is available at https support huawei com or https support huawei com enterprise 5 2 Applying for Access Rights To manage the UPS by using an SNMP card apply to the system administrator of the SNMP card for access rights and add the NMS information to the NMS access list of the S...

Страница 53: ...e HUAWEI MIB V3 34 mib and HUAWEI UPS MIB mib files Download the MIB files on the web browser For details see section 4 6 1 Comm Config Page When you load the MIB library by using the NMS load the HUAWEI MIB V3 34 mib file and then the HUAWEI UPS MIB mib file For details see the NMS user manual 6 3 Managing the UPS by Using the NMS 6 3 1 Applying for Access Rights To manage the UPS by using an SNM...

Страница 54: ... the UPS RFC1628 MIB before using 7 2 Managing the UPS by Using the NMS 7 2 1 Applying for Access Rights To manage the UPS by using the UNMS of Generex over an SNMP card apply to the system administrator of the SNMP card for access rights and add the NMS information to the NMS access list of the SNMP card NMS Address and Permission Settings is used for adding information about the NMS accessing th...

Страница 55: ...n implements the specified protection measures to protect your computer or server hardware and software assets 8 2 Adding NetShutdown Software to the SNMP Card To manage the UPS by using an SNMP card apply to the SNMP card system administrator for management rights and add IP address information of the PC corresponding to NetShutdown software to the SNMP card access list 8 3 Obtaining the UPS Stat...

Страница 56: ... command or trap message to the RCCMD client Receives the message UPS alive check sent by the RCCMD client and replies with the system status Configures and saves the address and port for receiving the shutdown command and the message sending mechanism For the method of installing the RCCMD client see the manual related to the RCCMD 9 2 RCCMD Event Shutdown and Message Sending Procedure Step 1 On ...

Страница 57: ...ed to set the SSL encryption to Disabled on the SNMP card WebUI Step 4 Configure events If you set the job type to RCCMD Message under Inverter on specify the IP address and port of the RCCMD client The port is 6003 by default If you need to modify the port modify the port on the RCCMD client at the same time to keep them the same Enter the message to be sent and set the message sending mechanism ...

Страница 58: ...er the UPS and RCCMD communicate properly The RCCMD client can also receive messages sent by the SNMP card Procedure Step 1 On the RCCMD client add the IP address of the SNMP card that detects heartbeat as shown in Figure 9 1 Step 2 The UPS2000 SNMP card supports both ways of detecting heartbeats If the job configured for the SNMP card event is set to RCCMD TRAP the RCCMD client needs to be set to...

Страница 59: ...User Manual 9 Protecting the Server by Using the RCCMD Software Issue 10 2020 03 20 Copyright Huawei Technologies Co Ltd 52 Figure 9 3 Detecting heartbeat manually Figure 9 4 Detecting heartbeat manually and successfully End ...

Страница 60: ... the UPS runs properly Check that the SNMP card is properly installed Check that the communications cable between the SNMP card and the UPS is intact 2 Web access problems Check that the computer network is normal Check the browser version and the SNMP card IP address that you have entered in the address bar 3 SNMP card problems If the fault persists after the preceding checks replace the SNMP car...

Страница 61: ...ep 1 On the Upgrade page click Browse and select a software upgrade package For versions earlier than UPS2000 V200R001C31SPC100 the upgrade package needs to be decompressed Select the file whose file name extension is bin after decompression For UPS2000 V200R001C31SPC100 and later versions the upgrade package does not need to be decompressed Select the compressed package whose file name extension ...

Страница 62: ...gure 11 3 Figure 11 3 Upload succeeded page Step 4 Click OK On the Activate Upgrade Package page select the upgrade package under Available Package Version when a package is selected it turns blue Then click Activate to start the upgrade as shown in Figure 11 4 When Upgrade progress reaches 100 and Upgrade Result is Inactive the upgrade is complete as shown in Figure 11 5 Then the software restart...

Страница 63: ...k network connectivity and log in again message is displayed If the upgrade fails and the UPS and the SNMP card do not power off click Activate again to restart the upgrade as shown in Figure 11 6 Figure 11 6 Upgrade failure scenario 1 If a power failure occurs during the upgrade power on the UPS and SNMP card again After you log in to the WebUI again click Go to Step 3 to perform the upgrade agai...

Страница 64: ...RMS SNMP01B SNMP Card User Manual 11 Upgrading the SNMP Card Issue 10 2020 03 20 Copyright Huawei Technologies Co Ltd 57 Figure 11 7 Upgrade failure scenario 2 End ...

Страница 65: ...s accessed over SSH you need to use client software such as PuTTY Security information involved in Secure Shell SSH login is the command line user name and password System accounts are as follows Administrator root Direct login is not supported Log in as enspire and run su to switch to the root account The user name cannot be modified The preset password is Changeme which can be modified Common us...

Страница 66: ... or special characters _ or space The password must be different from the previous five passwords The password must be different from the user name or its reverse Periodically change the password of the user account A password that has been used for a long time is more likely to be stolen or cracked and the risk increases along with the time of use Change the password at least once half a year 12 ...

Страница 67: ...operation Step 4 Run the su command to switch to the root user and enter the root user password as shown in Figure 12 2 Figure 12 2 Switching to the root user Step 5 Run the passwd root command to change the root user password Enter a new password and re enter it as instructed and press Enter Figure 12 3 shows the operation screen Record and keep the password properly If you forgot the password yo...

Страница 68: ...RMS SNMP01B SNMP Card User Manual 12 Changing the SSH Access Password Issue 10 2020 03 20 Copyright Huawei Technologies Co Ltd 61 Figure 12 3 Changing the password of the root user End ...

Страница 69: ...ncryption Standard D DES Data Encryption Standard DHCP Dynamic Host Configuration Protocol H HTTPS Hypertext Transfer Protocol Secure MD5 message digest algorithm 5 MIB management information base N NAT Network Address Translation NMS Network Management System R RJ11 Registered Jack 11 RJ45 Registered Jack 45 RS485 Recommended Standard 485 S SHA secure hash algorithm ...

Страница 70: ...ard User Manual AAcronyms and Abbreviations Issue 10 2020 03 20 Copyright Huawei Technologies Co Ltd 63 SNMP Simple Network Management Protocol SSH Secure Shell SSL Secure Sockets Layer U UPS uninterruptible power system ...

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