CloudEngine Series Switches FAQs-4.1 Stack

Latest reply: Sep 30, 2017 11:17:49 3633 1 0 0

4.1  Stack

4.1.1  What Ports and Cables Can Be Used to Set Up a Stack Among CE Series Switches?

Stack Port Type

Table 4-1 lists the types of ports used to set up a stack among CE series switches.

Table 4-1  Stack port requirements

Device Model

Ports Supporting Stack

Remarks

CE12800
  • 10GE optical ports
  • 10GE electrical ports
  • 40GE optical ports
  • 100GE optical ports
  • 10GE optical ports derived from 40GE optical ports can be used for stack connection. If 40GE optical ports have been configured as the stack physical member ports, they cannot be split.

  • In V100R003C00 and V100R003C10, 10GE optical ports derived from 100GE optical ports cannot be used for stack connection. In V100R005C00 and later versions, 10GE or 40GE optical ports derived from 100GE optical ports can be used for stack connection.

  • 10GE or 25GE optical ports derived from 100GE QSFP28 optical ports can be used for stack connection.

CE5810EI

10GE optical ports

Among the four 10GE optical ports of a CE5810-48T4S-EI, 10GE1/0/1 and 10GE1/0/2 must be added to the same stack port, and 10GE1/0/3 and 10GE1/0/4 must be added to another stack port. There is no such restriction on other models.

CE5850EI

  • 10GE optical ports

  • 40GE optical ports

-

CE5855EI

  • 10GE optical ports

  • 40GE optical ports

To use 10GE optical ports of a CE5855-48T4S2Q-EI switch for stack connection, you can only add 10GE1/0/1 to 10GE1/0/2 and 10GE ports split from 40GE1/0/2 (40GE1/0/2:1 to 40GE1/0/2:4) to the same logical stack port or add 10GE1/0/3 to 10GE1/0/4 and 10GE ports split from 40GE1/0/1 (40GE1/0/1:1 to 40GE1/0/1:4) to the same logical stack port. To use 40GE optical ports of a CE5855-48T4S2Q-EI switch for stack connection, do not add 40GE1/0/1 and 40GE1/0/2 to the same logical stack port.

CE5850HI

  • 10GE optical ports

  • 40GE optical ports

-

CE6810EI

  • 10GE optical ports

  • 40GE optical ports

-

CE6810LI

  • 10GE optical ports

  • 10GE electrical ports

  • 40GE optical ports

-

CE6850EI

  • 10GE optical ports

  • 10GE electrical ports

  • 40GE optical ports

-

CE6850HI/CE6850U-HI

  • 10GE optical ports

  • 10GE electrical ports

  • 40GE optical ports

-

CE6851HI

  • 10GE optical ports

  • 40GE optical ports

-

CE6855HI

  • 10GE optical ports

  • 10GE electrical ports

  • 40GE optical ports

-

CE6860EI
  • 25GE optical ports

  • 100GE optical ports

-

CE6870EI
  • 10GE optical ports

  • 10GE electrical ports

  • 100GE optical ports

-

CE6880EI
  • 10GE electrical ports

  • 10GE optical ports

  • 40GE optical ports

  • 100GE optical ports

-

CE7850EI
  • 40GE optical ports

-

CE7855EI
  • 40GE optical ports

-

CE8850EI
  • 10GE optical ports

  • 100GE optical ports

-

CE8860EI
  • 10GE electrical ports

  • 25GE optical ports

  • 40GE optical ports

  • 100GE optical ports

Physical ports on different subcards can be added to the same stack port.

Pay attention to the following points:
  • Physical member ports in a stack port must be the same type. For example, 10GE and 40GE ports cannot be added to the same stack port.

  • 10GE optical ports derived from 40GE optical ports on devices except CE7850EI and CE7855EI can be used for stack connection. If 40GE optical ports have been configured as the physical member ports, they cannot be split.

  • Only 40GE ports aggregated from CE6810-48S-LI's 10GE ports can be used for stack connection.

  • On the CE6850EI, CE6810EI, CE6810LI, and CE5850EI, if a 10GE port with port number in the range 4N+1 to 4N+4 (N=0, 1, 2, 3...) is configured as a physical member port, all the ports with port numbers 4N+1 to 4N+4 are configured as physical member ports. For example, if you configure 10GE1/0/1 as a physical member port, all the interfaces from 10GE1/0/1 to 10GE1/0/4 are configured as physical member ports.

  • When configuring ports of the CE8860EI or CE6860EI as physical stack ports, pay attention to the following points:
    • 25GE SFP28 ports cannot be used for stack connections after their rate is configured to 10 Gbit/s or 1 Gbit/s using the port mode { 10ge | ge } command.

    • 100GE QSFP28 ports cannot be used for stack connections after their rate is configured to 40 Gbit/s using the speed 40000 command.

    • If a 25GE SFP28 optical port or 10GE RJ45 electrical port with port number in the range 4N+1 to 4N+4 (N=0, 1, 2, 3...) needs to be configured as a physical member port, all the ports with port numbers 4N+1 to 4N+4 must be configured as physical member ports.
    • If a 40GE QSFP+ optical port needs to be configured as a physical member port, two contiguous ports must be configured as physical member ports; alternatively, four 10GE optical ports split from two contiguous 40GE optical ports can be configured as physical member ports. A 40GE QSFP+ optical port can be split into two 10GE optical ports.
  • When configuring ports of the CE8860EI or CE6860EI as physical stack ports, pay attention to the following points:
    • 100GE QSFP28 ports cannot be used for stack connections after their rate is configured to 40 Gbit/s using the speed 40000 command.

    • If a 10GE optical port needs to be configured as a stack member port, both 10GE optical ports must be configured as stack member ports. That is, both 10GE1/0/1 and 10GE1/0/2 must be configured as stack member ports.
  • On the CE6870EI, 100GE QSFP28 ports cannot be used for stack connections after their rate is configured to 40 Gbit/s using the speed 40000 command.

Stack Cable

Stack setup requires only common network cables or fibers but not dedicated stack cables. Optical ports are connected using high-speed cables, AOC cables or optical modules and optical fibers; electrical ports are connected using Category 6, Category 6A, or Category 7 cables.

SIP ports on the MPUs of a CE12800 use network cables and LC fibers. If LC fibers are used on SIP ports, GE optical modules must be used on the ports.

4.1.2  Can GE Optical Modules Be Used to Set Up a Stack?

GE optical modules cannot be used to set up a stack.

4.1.3  Do All CE Series Switches Support Stacking?

All CE series switch models in all versions support the stacking function.

4.1.4  How Do I Configure Stack?

0483b84a2be34a13b5325ce030050499 NOTE:

The following example describes basic stack configurations. For details, see the related product configuration manual.

Configuring Stack on CE12800 Series Switches

<HUAWEI> system-view
[~HUAWEI] stack
[~HUAWEI-stack] stack member 1      //Set a stack member ID.
[*HUAWEI-stack] stack priority 150      //Set the stack priority.
[*HUAWEI-stack] stack domain 10       //Configure a stack domain ID.
[*HUAWEI-stack] stack link-type mainboard-direct      //Configure the stack connection mode.
[*HUAWEI-stack] quit
[*HUAWEI] commit
[~HUAWEI] port-group group1
[*HUAWEI-port-group-group1] group-member 10ge 1/0/1 to 10ge 1/0/2
[*HUAWEI-port-group-group1] group-member 10ge 2/0/1 to 10ge 2/0/2
[*HUAWEI-port-group-group1] shutdown      //Shut down the physical member port to be added to a logical stack port.
[*HUAWEI-port-group-group1] quit
[*HUAWEI] commit
[~HUAWEI] interface stack-port 1      //Create a logical stack port.
[*HUAWEI-Stack-Port1] port member-group interface 10ge 1/0/1 to 1/0/2      //Add physical member ports to the logical stack port.
[*HUAWEI-Stack-Port1] port member-group interface 10ge 2/0/1 to 2/0/2
[*HUAWEI-Stack-Port1] quit
[*HUAWEI] commit
[~HUAWEI] port-group group1
[~HUAWEI-port-group-group1] undo shutdown      //Open the shutdown physical member ports.
[*HUAWEI-port-group-group1] quit
[*HUAWEI] commit
[~HUAWEI] quit
<HUAWEI> save      //Save the configuration.
Warning: The current configuration will be written to the device. Continue? [Y/N]: y
<HUAWEI> system-view
[~HUAWEI] stack
[~HUAWEI-stack] stack enable      //Enable the stack function.
Warning: Make sure that one or more dual-active detection methods are configured once the conversion is complete and the device ente
rs the stack mode.
Current configuration will be converted to the next startup saved-configuration file of stack mode.
System will reboot. Continue? [Y/N]: y

Configuring Stack on CE8800&7800&6800&5800 Series Switches

<HUAWEI> system-view
[~HUAWEI] stack
[~HUAWEI-stack] stack member 1 renumber 2 inherit-config      //Set a stack member ID.
Warning: The stack configuration of member ID 1 will be inherited to member ID 2 after the device resets. Continue? [Y/N]: y
[*HUAWEI-stack] stack member 1 priority 150      //Set the stack priority.
[*HUAWEI-stack] stack member 1 domain 10       //Set a stack domain ID.
[*HUAWEI-stack] quit
[*HUAWEI] commit
[~HUAWEI] port-group group1
[*HUAWEI-port-group-group1] group-member 10ge 1/0/1 to 10ge 1/0/4
[*HUAWEI-port-group-group1] shutdown      //Shut down the physical member port to be added to a logical stack port.
[*HUAWEI-port-group-group1] quit
[*HUAWEI] commit
[~HUAWEI] interface stack-port 1/1      //Create a logical stack port.
[*HUAWEI-Stack-Port1/1] port member-group interface 10ge 1/0/1 to 1/0/2
[*HUAWEI-Stack-Port1/1] quit
[*HUAWEI] interface stack-port 1/2
[*HUAWEI-Stack-Port1/2] port member-group interface 10ge 1/0/3 to 1/0/4
[*HUAWEI-Stack-Port1/2] quit
[*HUAWEI] commit
[~HUAWEI] port-group group1
[~HUAWEI-port-group-group1] undo shutdown      //Open the shutdown physical member ports.
[*HUAWEI-port-group-group1] quit
[*HUAWEI] commit
[~HUAWEI] quit
<HUAWEI> save      //Save the configuration.
Warning: The current configuration will be written to the device. Continue? [Y/N]: y
<HUAWEI> reboot      //Restart the device.
Warning: The system will reboot. Continue? [Y/N]: y

4.1.5  How Do I Troubleshoot a Stack Setup Failure?

Possible causes for a stack setup failure include incorrect configuration, faulty links. Perform the following operations to troubleshoot a stack setup failure.
  1. Check whether a stack can be set up between these member switches.

    Run the display device command to view the member switch models and then determine whether a stack can be set up between these switches. If not, replace these switches.

  2. Check whether the stack configuration is correct.

    Run the display stack configuration all command to check whether the stack configuration meets requirements.

    The following uses the display on a CE12800 switch as an example.

    <HUAWEI> display stack configuration all
    Oper : Operation
    Conf : Configuration
    *    : Offline configuration
    Isolated Port: The port is in stack mode, but does not belong to any Stack-Port
    
    Attribute Configuration:
    ---------------------------------------------------------------
     MemberID      Domain         Priority       Mode     Enable
    Oper(Conf)   Oper(Conf)      Oper(Conf)   Oper(Conf)   Oper
    ---------------------------------------------------------------
    1(1)         10(10)          150(150)     MB(MB)       Enable
    ---------------------------------------------------------------
    
    Stack-Port Configuration:
    --------------------------------------------------------------------------------
    Stack-Port           Member Ports
    --------------------------------------------------------------------------------
    Stack-Port1/1        10GE1/1/0/1    10GE1/1/0/2
    --------------------------------------------------------------------------------
    
    In the command output, the Oper(Conf) field indicates the current configuration and next startup configuration.
    • Check whether all member switches use the same stack domain ID. All member switches must use the same stack domain ID. Otherwise, they cannot set up a stack.

      If member switches use different stack domain IDs, run the stack member { member-id | all } domain domain-id command to change their stack domain IDs to the same.

    • (Applicable only to the CE12800) Check whether all member switches use the same stack connection mode. All member switches must use the same stack connection mode. Otherwise, they cannot set up a stack. MB indicates the default MPU connection mode, and LC indicates the LPU connection mode.

      If member switches use different stack connection modes, run the stack member { member-id | all } link-type { mainboard-direct | linecard-direct } command to change their stack connection modes to the same.

    • (Applicable only to the CE12800) Check whether the stacking function has been enabled on member switches. Member switches must have the stacking function enabled to set up a stack. Enable indicates that the stacking function is enabled, and Disable indicates that the stacking function is disabled.

      If member switches have the stacking function disabled, run the stack enable command to enable this function.

    • Check whether member switches have offline configuration. The configuration marked with an asterisk (*) is offline configuration. If offline configuration exists, you must delete it. This is because offline configuration may case a stack configuration conflict, which will cause a failure to set up a stack.

  3. Check whether stack connections are correct.

    Check whether stack connections are consistent with the plan and configuration.

  4. Check whether ports used for stack connections are Up.

    Run the display interface brief command to check whether the ports used for stack connections are physically up, including stack member ports and SIP ports (applicable only to the CE12800). If these ports are physically Down, check whether optical modules and fibers are faulty.

    In V100R005C00 and later versions, you can also run the display stack link-state last-down-reason command to check the reason why the stack link protocol becomes Down. The reason includes incorrect configuration or cable connection.

  5. Check stack failure event information.

    Run the display stack troubleshooting command to check whether stack failure events occur. This command can record some failures occurring during a stack setup, including configuration errors and connection errors. Troubleshoot these failures according to failure event description.
    <HUAWEI> display stack troubleshooting
    Total :1      
    ----------------------------------------------------------------------------------------
    Seq  Time                     Event Description
    ----------------------------------------------------------------------------------------
    1    2012-11-23 11:28.889  The devices belong to different stack domains, 
                                        and stack cannot be established. (MemberID = 1, 
                                        DomainID = 10, PeerMemberID = 2, PeerDomainID = 20) 
    ----------------------------------------------------------------------------------------
    
  6. Collect the following information and contact technical support personnel.

    • Results of the preceding troubleshooting procedure.
    • Configuration file, logs, and diagnostic logs.

4.1.6  Do CE Series Switches Support Service Port Stacking?

CE series switches support service port stacking.

4.1.7  Can Stack Cards Be Used to Set Up a Stack for CE Series Switches?

Stack cards cannot be used to set up a stack for CE series switches.

4.1.8  Which CE Series Switches Support Stack and How Many Member Switches Does a Stack Contain at Most?

Table 4-2 lists the stack-supporting CE series switches and maximum number of member switches in a stack.

Table 4-2  Device models and versions used to set up stacks

Device Series and Model

Maximum Number of Member Switches in a Stack

Version Support

CE12800
  • CE12804
  • CE12808
  • CE12812
  • CE12816
2

CE12804, CE12808, CE12812: V100R001C00 and later versions

CE128016: V100R003C00 and later versions

CE12800S
  • CE12804S
  • CE12808S
2

V100R005C00 and later versions

CE12800E
  • CE12804E
  • CE12808E
  • CE12816E
2

V200R002C50 and later versions

CE5810EI
  • CE5810-24T4S-EI
  • CE5810-48T4S-EI
9

V100R002C00 and later versions

CE5850EI
  • CE5850-48T4S2Q-EI
16

V100R001C00 and later versions

CE5855EI
  • CE5855-24T4S2Q-EI
  • CE5855-48T4S2Q-EI
9

V100R005C10 and later versions

CE5850HI
  • CE5850-48T4S2Q-HI
9

V100R003C00 and later versions

CE6810EI
  • CE6810-48S4Q-EI
16

V100R003C00 and later versions

CE6810LI
  • CE6810-48S-LI
  • CE6810-48S4Q-LI
  • CE6810-24S2Q-LI
  • CE6810-32T16S4Q-LI
16

CE6810-48S-LI, CE6810-48S4Q-LI: V100R003C10 and later versions

CE6810-24S2Q-LI, CE6810-32T16S4Q-LI: V100R005C10 and later versions

CE6850EI
  • CE6850-48T4Q-EI
  • CE6850-48S4Q-EI
16

V100R001C00 and later versions

CE6850HI/CE6850U-HI
  • CE6850-48S6Q-HI
  • CE6850-48T6Q-HI
  • CE6850U-24S2Q-HI
  • CE6850U-48S6Q-HI
16

CE6850-48S6Q-HI: V100R005C00 and later versions

CE6850-48T6Q-HI, CE6850U-24S2Q-HI, CE6850U-48S6Q-HI: V100R005C10 and later versions

CE6851HI
  • CE6851-48S6Q-HI
16

V100R005C10 and later versions

CE6855HI
  • CE6855-48T6Q-HI
  • CE6855-48S6Q-HI
16

V200R001C00 and later versions

CE6860EI
  • CE6860-48S8CQ-EI
16V200R002C01 and later versions
CE6870EI
  • CE6870-24S6CQ-EI
  • CE6870-48S6CQ-EI
  • CE6870-48T6CQ-EI
9

CE6870-24S6CQ-EI, CE6870-48S6CQ-EI: V200R001C00 and later versions

CE6870-48T6CQ-EI: V200R002C50 and later versions

CE6880EI
  • CE6880-24S4Q2CQ-EI
  • CE6880-48S4Q2CQ-EI
  • CE6880-48T4Q2CQ-EI
16

CE6880-24S4Q2CQ-EI, CE6880-48S4Q2CQ-EI: V200R002C10 and later versions

CE6880-48T4Q2CQ-EI: V200R002C20 and later versions

CE7850EI
  • CE7850-32Q-EI

16

In V100R003C00, at most four CE7850EIs can set up a stack. In V100R003C10 and later versions, at most 16 CE7850EIs can set up a stack.

V100R003C00 and later versions

CE7855EI
  • CE7855-32Q-EI
16V200R001C00 and later versions
CE8850EI
  • CE8850-32CQ-EI
16V200R002C50 and later versions
CE8860EI
  • CE8860-4C-EI

9

V100R006C00 and later versions

Pay attention to the following points:
  • Switches of different series cannot set up a stack. For example, CE5850HI and CE5850EI switches cannot set up a stack; CE6850HI and CE6851HI switches cannot set up a stack.

  • Switches of the same series but different models can set up a stack. For example, CE5810-24T4S-EIs and CE5810-48T4S-EIs can set up a stack.

    • CE6850-48T6Q-HIs can set up a stack with only CE6850-48T6Q-HIs but not CE6850-48S6Q-HIs, CE6850U-48S6Q-HIs, or CE6850U-24S2Q-HIs.

    • CE6870-48T6CQ-EIs can set up a stack with only CE6870-48T6CQ-EIs but not CE6870-24S6CQ-EIs or CE6870-48S6CQ-EIs.

4.1.9  How Do I Load Patches to a Stack?

The process of loading patches to a stack is similar to that on a standalone switch.
  1. Upload a patch package to the master switch.

  2. Run the patch load filename all run command in the user view to load and run patches.

    The patch file on the master switch will be automatically copied and loaded to other member switches.

  3. Run the display patch-information verbose command to check whether patches are loaded successfully.

4.1.10  How Do I Load a License for a Stack System?

The procedure for loading a license on a stack system is as follows:
  1. Apply for a license and upload the license file to the master switch of the stack system.

    The license is bound to the ESN of a physical device, and each stack member has an independent ESN. You can apply for a license for multiple switches in a stack or for each switch.

  2. In the user view, run the license active file-name command to activate the license file you uploaded.
    • If there are multiple license files, run the license active file-name command multiple times and specify different values for file-name. The system will then find the matching ESN to activate the license files.

    • If there is only one license file, run the license active file-name command only once.

  3. Run the display license command to check whether a license file has been loaded. When the license status is Normal, the license file has been loaded successfully.

If you load the licenses on multiple devices and then set up a stack system, the features activated for the stack are a combination of features activated for these member devices. Even if a license is uploaded to only one of these devices, the license is effective for the stack system. If the stack system breaks up, the licenses loaded to the devices respectively take effect. In addition, the activated licensed features can still be used on the devices even if these features are not activated using the devices' own license. It is recommended that all the member switches in a stack apply for licenses.

The following example describes how to load licenses in a stack of CE8800&7800&6800&5800 series switches.
  • In versions earlier than V200R002C10

    • If there are multiple license files:

      <HUAWEI> license active license_file_1.dat
      Now activing the license......done.
      MainBoard:
      Info: Succeeded in activating the license file on the board.
      SlaveBoard:
      Error: The ESN of the license file does not match with the device.
      
      <HUAWEI> license active license_file_2.dat
      Now activing the license......done.
      MainBoard:
      Error: The ESN of the license file does not match with the device.
      SlaveBoard:
      Info: Succeeded in activating the license file on the board.
      
    • If there is a single license file:

      <HUAWEI> license active license_file.dat
      Now activing the license...........done.
      MainBoard:
      Info: Succeeded in activating the license file on the board.
      SlaveBoard:
      Info: Succeeded in activating the license file on the board.
      
  • In V200R002C10 and later versions

    • If there are multiple license files:

      <HUAWEI> license active license_file_1.dat
      Now activing the license......
      Info: The license file is verified successfully, but there are some minor errors, including
             ESN mismatch
      Warning: This operation maybe use the trial license instead of current license, may be reduce current resource or functions on slot 2. Continue?
       [Y/N]: n      //If this message is displayed when the first license file is loaded, enter y or n as required.
      MainBoard:
      Info: Succeeded in activating the license file on the board.
      SlaveBoard:
      Info: Skip activating the license because it will reduce current resource or function.
      
      <HUAWEI> license active license_file_2.dat
      Now activing the license......
      Info: The license file is verified successfully, but there are some minor errors, including
             ESN mismatch
      Warning: This operation maybe use the trial license instead of current license, may be reduce current resource or functions on slot 1. Continue?
       [Y/N]: n      //When the second license file is being loaded, you must enter n; otherwise, the first license file is overwritten.
      MainBoard:
      Info: Skip activating the license because it will reduce current resource or function.
      SlaveBoard:
      Info: Succeeded in activating the license file on the board.
      

      If you enter y when the message "Warning: This operation maybe use the trial license instead of current license" is displayed, the license file is loaded to all the switches regardless of whether their ESNs match the ESN in the license file. If their ESNs do not match the ESN in the license file, their license status is Trial. If you enter n, the license file is loaded only to the switch with the ESN matching the ESN in the license file.

    • If there is a single license file:

      <HUAWEI> license active license_file.dat
      Now activing the license......done.
      MainBoard:
      Info: Succeeded in activating the license file on the board.
      SlaveBoard:
      Info: Succeeded in activating the license file on the board.
      

4.1.11  Is a License File Loaded Before or After a Stack Is Set Up?

You can load a license file on switches before or after setting up a stack. The result is not affected by the operation sequence.

4.1.12  How Many License Files Can Be Applied for for a Stack?

When applying for license files for a stack, you can apply for a license file for each ESN or apply for only one license file for multiple ESNs.

4.1.13  How Do I Perform a Master/Standby Switchover in a Stack?

You can manually trigger a master/standby switchover in a stack if the current roles of member switches do not meet your requirement. For example, you can perform a master/standby switchover to change the roles after a restart or restore the original roles after an upgrade.

The following example describes the master/standby switchover on a CE8800&7800&6800&5800.
<HUAWEI> display switchover state      //Check whether the stack meets switchover requirements.
   Switchover State  :  Ready          //You can perform a master/standby switchover only when the stack is ready for the switchover.
   Switchover Policy :  Board Switchover
   MainBoard         :  1
   SlaveBoard        :  2
<HUAWEI> system-view
[~HUAWEI] slave switchover enable      //Enable the switchover function.
[*HUAWEI] commit
[~HUAWEI] slave switchover             //Perform a master/standby switchover.
Warning: This operation will switch the slave board to the master board. Continue? [Y/N]: y
0483b84a2be34a13b5325ce030050499 NOTE:

Before a master/standby switchover is performed in a stack of CE12800s, ensure that the master switch has two MPUs installed.

4.1.14  Will a Master/Standby Switchover Change the Stack Member ID?

A master/standby switchover will not change the stack member ID.

4.1.15  Can Four 10GE Ports of a CE5800 Provide Two Ports for Stack Connections and the Other Two as Service Ports?

CE5810EI, CE5855EI and CE5850HI support this application but CE5850EI does not. When 10GE ports of a CE5850EI are used for stack connections, all the four 10GE ports must be configured as physical member ports and cannot function as service ports again. This restriction does not apply to CE5810EI, CE5855EI and CE5850HI.

4.1.16  Can Two 40GE Ports of a CE5855EI Be Added to the Same Logical Stack Port?

Two 40GE ports of a CE5855-48T4S2Q-EI cannot be added to the same logical stack port.

Two 40GE ports of a CE5855-24T4S2Q-EI can be added to the same logical stack port.

4.1.17  Must Four Consecutive 10GE Ports Be Simultaneously Configured for a Stack of CE6800 Series Switches?

Among CE6800 series switches, if 10GE ports of the CE6850EI, CE6810EI, or CE6810LI need to be configured as physical member ports, four ports with consecutive port numbers 4N+1 through 4N+4 (N is a natural number) must be simultaneously configured. This restraint does not apply to other CE6800 models.

4.1.18  What Are Differences Between the MPU Connection Mode and LPU Connection Mode of CE12800 Member Switches?

  • In MPU connection mode, management links and forwarding links are separated, ensuring high reliability. SIP ports on the MPUs and service ports on the LPUs must be connected for member switches.

  • In LPU connection mode, management links and forwarding links are integrated. Only service ports on the LPUs are connected for member switches.

4.1.19  What Types of Cables Are Applicable to SIP Ports on the MPU of a CE12800 Switch?

In MPU connection mode, stack management links are connected through SIP ports on MPUs. A SIP port is a combo port consisting of a GE electrical port and a GE optical port. It starts to work immediately after a cable is connected and does not require any configuration. By default, the working mode of a combo port depends on whether the electrical port or optical port has a cable connected first. If the electrical and optical ports have a cable connected at the same time, the combo port works as an optical port.

Common cables applicable to SIP ports include network cables and LC fibers. When LC fibers need to be used, GE optical modules must be used on SIP ports.

4.1.20  What Are the Requirements of the MPU Connection Mode on SIP Port Connection of MPUs?

In MPU connection mode, MPUs of the master and standby chassis must be connected through SIP interfaces.

SIP ports are located on MPUs. Each MPU has two SIP ports, as shown in Figure 4-1. A SIP port is a combo port consisting of a GE electrical port and a GE optical port. It starts to work immediately after a cable is connected and does not require any configuration. By default, the working mode of a combo port depends on whether the electrical port or optical port has a cable connected first. If the electrical and optical ports are connected at the same time, the optical port works.
Figure 4-1  SIP ports on an MPU
CloudEngine Series Switches FAQs-4.1  Stack-2514189-3
Figure 4-2 shows the recommended SIP port connections when each stack member switch has two MPUs.
Figure 4-2  SIP port connections
b562d69e04cd4f7e99867b0f9ba307b2
0483b84a2be34a13b5325ce030050499 NOTE:

It is recommended that MPUs of the master and standby chassis should be directly connected through four cables to ensure reliability. Although a stack can still operate when the MPUs are directly connected through one cable, reliability is low. Therefore, one cable is not recommended.

4.1.21  Can SIP Ports Run Services?

SIP ports on the MPUs of the CE12800 are used only for stack connections and cannot run other services.

4.1.22  Must SIP Ports Be Configured?

SIP ports are plug-and-play and do not need to be configured using software.

4.1.23  How Can I Connect a Stack of CE12800s?

CE12800s have two connection modes, as shown in Figure 4-3.
  • MPU connection mode: separates management links from forwarding links. In this mode, management links are connected through the system interconnect ports (SIPs) on MPUs, and forwarding links are connected through service ports on LPUs.

  • LPU connection mode: integrates management links and forwarding links. In this mode, management links and forwarding links are connected through service ports on LPUs without requiring SIP ports on MPUs.

Figure 4-3  Stack connection modes of CE12800
d90ec4a278c543afb6f7c96e1fc2d1eb

The MPU connection mode is recommended because it separates management links and forwarding links and so ensures stack reliability.

4.1.24  How Are Stack Cables Connected for CE8800&7800&6800&5800 Series Switches?

Each CE8800&7800&6800&5800 series switch has two logical stack ports. The stack ports are Stack-Portn/1 and Stack-Portn/2, where n indicates the stack member ID of a switch. Multiple physical member ports can be added to a logical stack port.

Member switches can be connected using a ring or chain topology. There is no requirement on the sequence in which logical stack ports are connected.
Figure 4-4  Stack cable connections
3d50d2cd50cf4fbb8a52f850c074136d

4.1.25  How Many Cables Are Required for Setting Up a Stack?

At least one cable is used to connect two member switches. To ensure reliability, you are advised to use two cables to connect different cards of two member switches.

4.1.26  Are Dedicated Cables Required for Setting Up a Stack of CE Series Switches?

Common service cables are used to set up a stack of CE series switches, and no dedicated stack cable is required. High-speed cables, active optical cables (AOCs), or optical modules and optical fibers are used for connecting optical ports. Category-6, Category-6A, or Category-7 network cables are used to connect electrical ports.

4.1.27  Can a Stack Be Set Up Using Only One 40GE Port on a Member Switch?

A stack can be set up using only one 40GE port on a member switch. To ensure reliability, it is recommended that a stack be set up using two or more ports.

4.1.28  Can GE Ports Be Used to Set Up a Stack?

GE ports of CE switches cannot be used to set up a stack. 10GE ports that have GE optical modules installed also cannot be used to set up a stack.

4.1.29  Can 10GE Electrical Ports Be Used to Set Up a Stack?

10GE electrical ports of CE switches can be used to set up a stack.

4.1.30  Can 10GE Optical Ports Be Used to Set Up a Stack?

The 10GE optical ports on CE series switches can be used to set up a stack.

4.1.31  Can 10GE Ports Split from a 40GE Port Be Used to Set Up a Stack?

On all switch models except the CE7850EI and CE7855EI, 10GE ports split from a 40GE port can be used to set up a stack.

4.1.32  Can CE6800s and CE5800s Set Up a Stack?

No. Only devices of the same series can set up a stack.

4.1.33  How Can I Add a Stack Member Switch Without Affecting Services?

To add a member switch to a stack, perform the following operations in sequence:
  1. Upgrade the software version of the new switch to the current stack system version to prevent multiple restarts resulted from version synchronization and speed up stack setup.
  2. Complete the stack configuration of the switch, save the configuration, and then power off the switch.
  3. Connect the switch to the stack using stack cables.
  4. Power on the switch to enable it to join the stack without affecting the stack.

4.1.34  How to Replace One Stack Member Switch?

You may need to replace a faulty member switch in a stack. To prevent services from being interrupted during the switch replacement, use inter-device link aggregation to connect upstream and downstream devices for link backup.

CE8800&7800&6800&5800 Series Switches

  • Replace one member switch in a stack of two member switches.

    SwitchA and SwitchB set up a stack. SwitchA is faulty and needs to be replaced by SwitchC. You are advised to follow this procedure to complete the replacement:
    1. Ensure that SwitchC has the same system software version and hardware model as SwitchA before the replacement. To check the system software version and hardware model of switches, run the display version and display device commands.

    2. Run the display stack, display stack configuration and display interface brief commands to check and record the stack status, stack configuration and interface status.

    3. Before connecting SwitchC with stack cables, power on and perform the stack configuration on SwitchC in accordance with the stack configuration on SwitchA. For details about the stack configuration, see the configuration guide. After the configuration is complete, save the configuration and then restart SwitchC.

      In addition to configuring stack commands one by one on SwitchC, you can copy the stack configuration file of SwitchA to SwitchC to ensure the same configuration on the two switches.
      1. Change the stack member ID of SwitchC to the same as SwitchA and then restart SwitchC to make the modification take effect. If SwitchC is a CE12800 switch, you also need to enable the stack function.

      2. After SwitchC starts, copy the stack configuration file to SwitchC. SwitchC then restarts with this configuration file. Subsequently, SwitchC has the same configuration as SwitchA.

    4. After SwitchC starts, check whether it has the same stack configuration with SwitchA again. If so, power off SwitchC.

    5. Run the display stack command to check whether SwitchA is the master switch. If so, perform an active/standby switchover in the stack. If not, go to the next step.

      <HUAWEI> display switchover state      //Check whether the system meets switchover requirements.
         Switchover State  :  Ready          //You can perform an active/standby switchover only when the Switchover State field displays Ready.
         Switchover Policy :  Board Switchover
         MainBoard         :  1
         SlaveBoard        :  2
      <HUAWEI> system-view
      [~HUAWEI] slave switchover enable      //Enable the active/standby switchover function.
      [*HUAWEI] commit
      [~HUAWEI] slave switchover      //Perform an active/standby switchover.
      Warning: This operation will switch the slave board to the master board. Continue? [Y/N]: y
      

      After an active/standby switchover is performed, the master switch will restart. After the switch restarts and joins the stack again, go to the next step. To check whether the switch has joined the stack again, run the display stack command.

    6. Power off and remove SwitchA.

    7. Install SwitchC and connect cables to its service ports, stack ports, and ports that have dual-active detection (DAD) configured.

    8. Power on SwitchC so that SwitchC joins the stack as a new member. Run the display stack command to check whether SwitchC can set up a stack with SwitchB.

    9. After SwitchC and SwitchB set up a stack, run the display stack configuration and display interface brief commands to check the stack configuration and interface status. Ensure that the stack configuration is the same as that used before the device deplacement and interfaces can become Up normally.

    10. After confirming all services are normal, run the save command to save the stack configuration.

    11. If the current master and standby switches are different from those before the device replacement, perform an active/standby switchover.

  • Replace one member switch in a stack of three or more member switches (in a ring topology).

    In a stack set up by three or more member switches in a ring topology, the device replacement procedure is similar to that in a stack of two member switches. For details, see Replace one member switch in a stack of two member switches.

  • Replace one member switch in a stack of three or more member switches (in a chain topology).

    In a stack set up by three or more member switches in a chain topology, the replacement procedure of edge switches on both ends is similar to that of a stack with two member switches. For details, see Replace one member switch in a stack of two member switches. To replacement an intermediate switch, change the stack connection topology to the ring topology and then replace the switch according to Replace one member switch in a stack of two member switches. The procedure is as follows:
    1. On edge switches on both ends, create a logical stack port and add member ports into the logical stack port, and then connect these ports using cables.

      <HUAWEI> system-view
      [~HUAWEI] interface stack-port 1/1      //Create a logical stack port.
      [*HUAWEI-Stack-Port1/1] port member-group interface 10ge 1/0/1 to 1/0/2      //Add member ports into the logical stack port.
      [*HUAWEI] commit
      

      After cables are connected, run the display stack topology command to check whether the stack connection topology is changed to the ring topology.

    2. After the stack connection topology changes to ring topology, replace the switch according to Replace one member switch in a stack of two member switches.

    3. To restore the stack connection topology to chain topology after the replacement, remove the stack cables connected in step 1.

CE12800 Series Switches

In a stack of two CE12800s, replace the faulty member switch according to Replace one member switch in a stack of two member switches of CE8800&7800&6800&5800 series switches.

4.1.35  How Can I Restart a Stack Member?

  • In a stack of CE12800s, run the reset chassis chassis-id command in the user view to restart the specified member switch.

  • In a stack of CE8800&7800&6800&5800s, run the reset slot slot-id command in the user view to restart the specified member switch.

Before restarting a member switch, save the stack configuration to ensure that the restarted switch can join the stack normally.

4.1.36  How Can I Configure Port Split in a Stack?

The port split procedure is the same in stack and non-stack scenarios. That is, run the port split command in the system view, save the configuration, and then restart the board or device.

4.1.37  Can a Stacked CE12800 Be Virtualized into VSs?

Yes.

4.1.38  Can Only One Service Port Be Used as a Stack Port?

Yes.

To improve reliability, you are advised to add at least two physical member ports to each stack port.

4.1.39  How Many Times Member Switches Need to Restart If Two CE5850s Set Up a Stack?

Each member switch needs to restart only once to set up a stack. Perform the following operations in sequence:
  1. Complete the stack configuration of the master switch, save the configuration, and then restart the switch.
  2. Complete the stack configuration of the standby switch, save the configuration, and then power off the switch.
  3. Connect the master and standby switches using stack cables, and then power on the standby switch.

4.1.40  Does Stacking Support Inter-Chassis Link Aggregation?

Inter-chassis link aggregation is supported in a stack.

It is recommended that upstream and downstream devices connect to a stack using inter-chassis link aggregation to ensure link reliability.

4.1.41  How Do I Configure Inter-Chassis Link Aggregation?

The following example uses CE8800&7800&6800&5800 series switches. In Figure 4-5, SwitchA and SwitchB set up a stack and connect to SwitchC through inter-chassis link aggregation.
Figure 4-5  Configuring inter-chassis link aggregation
2422f62e8cf84efba9c043106dca6289
The configuration procedure is as follows:
  1. Configure an inter-chassis Eth-Trunk in the stack.
    <iStack> system-view
    [~iStack] interface eth-trunk 1
    [*iStack-Eth-Trunk1] trunkport 10ge 1/0/1
    [*iStack-Eth-Trunk1] trunkport 10ge 2/0/1
    [*iStack-Eth-Trunk1] commit
    
  2. Configure the Eth-Trunk on SwitchC.
    <SwitchC> system-view
    [~SwitchC] interface eth-trunk 1
    [*SwitchC-Eth-Trunk1] trunkport 10ge 1/0/1
    [*SwitchC-Eth-Trunk1] trunkport 10ge 1/0/2
    [*SwitchC-Eth-Trunk1] commit
    

4.1.42  Why the Stack Configuration of the CE12800 with Stack Member ID 2 Does Not Take Effect When the Stack Has the Next Startup Configuration File Cleared and Starts with a New Configuration File?

The following operations have been performed before this problem occurs:
  1. Run the reset saved-configuration command in the stack to clear the next startup configuration file.
  2. Specify a new configuration file for the stack and restart the stack. In the new configuration file, the stack configuration is as follows:
     #
     stack member 1 domain 10
     stack member 1 priority 150
     #
     stack member 2 domain 10
     stack member 2 priority 120
     #
    
  3. Check the stack configuration after the stack restarts, finding that the stack priority of the switch with stack member ID 2 is the same as that of the switch with stack member ID 1 but not the configured one.
    <HUAWEI> display stack configuration
    Oper : Operation
    Conf : Configuration
    *    : Offline configuration
    Isolated Port: The port is in stack mode, but does not belong to any Stack-Port
    
    Attribute Configuration:
    ---------------------------------------------------------------
     MemberID      Domain         Priority       Mode     Enable
    Oper(Conf)   Oper(Conf)      Oper(Conf)   Oper(Conf)   Oper
    ---------------------------------------------------------------
    1(1)         10(10)          150(150)     MB(MB)       Enable
    2(2)         10(10)          150(120)     MB(MB)       Enable
    ---------------------------------------------------------------
    ......
    
Possible causes for this problem include:
  1. After the next startup configuration file is cleared for a stack, the stack member ID for the next startup of each member switch becomes the default value 1. After the next startup configuration file is specified for the stack and the stack restarts, each member switch parses the configuration file based on their stack member IDs.
  2. When the stack restarts, because of stack member ID conflicts, the master switch re-assigns stack member ID 2 to the switch that fails the competition, and then the switch that fails the competition restarts.
  3. After the switch starts with stack member ID 2, it still parses the configuration of stack member 1 to ensure that a stack can be set up normally because the stack configuration of stack member 2 may not be included in the new configuration file or cannot set up a stack. As a result, the stack configuration of stack member 2 in the configuration file does not take effect.

4.1.43  Is Traffic Preferential Forwarding Enabled on an Eth-Trunk by Default?

The local traffic preferential forwarding function on an Eth-Trunk is enabled by default.

To disable local traffic preferential forwarding, run the local-preference disable command in the Eth-Trunk interface view.

4.1.44  How Do I Configure Local Traffic Preferential Forwarding?

Run the undo local-preference disable command in the Eth-Trunk interface view to enable local traffic preferential forwarding on the Eth-Trunk interface. By default, local traffic preferential forwarding is enabled.

<HUAWEI> system-view
[~HUAWEI] interface eth-trunk 10
[*HUAWEI-Eth-Trunk10] undo local-preference disable

4.1.45  What Is the Function of inherit-config?

You can run the stack member member-id renumber new-member-id [ inherit-config ] command to change the stack member ID.
  • If you specify inherit-config, the switch inherits the original stack configuration after it restarts, including the stack priority, stack domain ID, connection mode, and physical member port configuration. The common service port configuration will be lost. For example, the port split configuration will be lost, but the split configuration of physical member ports is inherited.

  • If you do not specify inherit-config, the current stack configuration and common service port configuration are lost after the switch restarts, and the configuration related to the new stack member ID in the configuration file takes effect.

  • If the configuration file contains offline configuration for the new stack member ID, do not specify inherit-config in the command.

4.1.46  What Are Difference Between CSS and iStack?

Cluster Switch System (CSS) technology is used to set up a stack of modular switches. iStack technology is used to set up a stack of fixed switches. CSS and iStack have different implementation methods but have the same functions.

4.1.47  Does a CE12800 CSS Support VS If a License File Is Loaded on Only One Member Switch?

If only one member switch has a license file loaded after a CE12800 CSS is set up and the license file supports VS, the entire CSS supports VS.

4.1.48  How Can I Change the Type of Physical Member Ports in a Stack Without Interrupting Traffic?

The following solutions apply only to the stack of CE8800&7800&6800&5800 series switches instead of the stack of CE12800 series switches.

In Figure 4-6, two switches set up a stack using 10GE ports. It is required that 10GE ports be switched to 40GE ports without interrupting services. Perform the following operations to meet this requirement:
  1. Create a new logical stack port and add 40GE ports in the created logical stack port. Connect the 40GE ports using cables to set up a stack in a ring topology.
  2. Remove cables of 10GE ports and delete the stack configuration of these ports.
Figure 4-6  Changing the type of stack member ports
1104f04218e14a749778ada38825d174

If the stack has been set up in a ring topology, remove 10GE ports from the logical stack port, remove their cables, add 40GE ports in the logical stack port, and then connect the 40GE ports using cables.

4.1.49  How Do I Upgrade a Stack?

A stack can be upgraded using the traditional upgrade method (specify the next-startup files and restart the entire stack) or the fast upgrade function. The fast upgrade function applies to a stack with two member switches.

  • System restart

    1. Upload the new system software to the master switch and copy it to all the other member switches. If a member switch has multiple MPUs, copy the new system software to all MPUs.

    2. Run the startup system-software system-file all command to specify the name of the system software to use at the next startup.

    3. Run the reboot command to restart the stack.

  • Fast upgrade

    1. Upload the new system software to the master switch and copy it to all the other member switches. If a member switch has multiple MPUs, copy the new system software to all MPUs.

    2. Run the startup system-software system-file all command to specify the name of the system software to use at the next startup.

    3. Run the system-view command to enter the system view.

    4. Run the stack command to enter the stack management view.

    5. Run the stack upgrade fast command to start a fast upgrade.

      After performing a fast upgrade, you can run the display stack upgrade status command to check the upgrade status.

4.1.50  How Do I Split a Stack?

If a stack is not required, split the stack to restore the member switches to standalone switches.

Splitting a CSS of CE12800 Switches

  1. Disable the CSS function. After the CSS function is disabled, the member switches restart without a configuration file and automatically back up the CSS configuration file used before the CSS splits.

    <HUAWEI> system-view
    [~HUAWEI] stack
    [~HUAWEI-stack] undo stack enable member all
    Warning: Current configuration will be cleared.
    System will reboot. Continue? [Y/N]: y
    
  2. Remove stack cables.

Splitting a Stack of CE8800&7800&6800&5800 Switches

  1. Back up the stack configuration file in case the stack needs to be set up again.

    <HUAWEI> copy stack.cfg stack_copy.cfg all
    
  2. Clear the configuration file for next start and restart the switch.

    <HUAWEI> reset saved-configuration
    The configuration will be erased to reconfigure.Continue? [Y/N]: y
    <HUAWEI> reboot
    Warning: The current configuration will be saved to the next startup saved-configuration file. Continue? [Y/N]: n
    Warning: The system will reboot. Continue? [Y/N]: y
  3. Remove stack cables.

4.1.51  How Do I Clear the Stack Configuration?

Clearing CE12800 Stack Configuration

To clear stack configuration of a CE12800 switch, disable the stacking function on this switch. After the stacking function is disabled on the switch, the switch restarts with zero configuration.

<HUAWEI> system-view
[~HUAWEI] stack
[~HUAWEI-stack] undo stack enable member all

Clearing CE8800&7800&6800&5800 Stack Configuration

To clear stack configuration of CE8800&7800&6800&5800, delete the stack configuration one by one using commands, set the stack member ID to 1, and restart the switch. If other service configurations do not need to be retained, clear the configuration file for the next startup and restart the switch.

4.1.52  How Do I Change the Stack Member ID?

Changing CE12800 Stack Member ID

  • When the stacking function is disabled on a switch, run the stack member new-member-id command to change its stack member ID.

    <HUAWEI> system-view
    [~HUAWEI] stack
    [~HUAWEI-stack] stack member 2
    
  • When the stacking function is enabled on a switch, run the stack member member-id renumber new-member-id [ inherit-config ] command to change its stack member ID.

    <HUAWEI> system-view
    [~HUAWEI] stack
    [~HUAWEI-stack] stack member 1 renumber 2
    Warning: The device will use the configuration of member ID 2 after the device resets. Continue? [Y/N]: y

Changing CE8800&7800&6800&5800 Stack Member ID

Run the stack member member-id renumber new-member-id [ inherit-config ] command to change the stack member ID.

<HUAWEI> system-view
[~HUAWEI] stack
[~HUAWEI-stack] stack member 1 renumber 2
Warning: The device will use the configuration of member ID 2 after the device resets. Continue? [Y/N]: y

4.1.53  Can Member Switches with Different System Software Versions Set Up a Stack?

Member switches with different system software versions can set up a stack. Member switches will synchronize with the system software version of the master switch, restart, and then join the stack again.

The system software version synchronized from the master switch must be able to run on other member switches; otherwise, these member switches cannot set up a stack.

It is recommended that switches use the same system software version before they set up a stack.

4.1.54  Does Stacking of CE12800s Have Restrictions on Slot IDs of Stack Cards?

Stacking of CE12800s does not have restrictions on slot IDs of stack cards.

4.1.55  Does Stacking of CE12800s Require that Member Switches Use the Same Number of Stack Cards?

In V100R003C00 and earlier versions, stacking of CE12800s requires that two member switches use the same number of stack cards.

In V100R003C10 and later versions, stacking of CE12800s does not require that two member switches use the same number of stack cards.

4.1.56  How Do I Change a Stack from the LPU Connection Mode to MPU Connection Mode?

Perform the following operations to change a stack from the LPU connection mode to MPU connection mode:

  1. Connect SIP ports on MPUs to meet cable connection requirements of the MPU connection mode.

  2. Run the stack member all link-type mainboard-direct command to change the stack connection mode to MPU connection.

    <HUAWEI> system-view
    [~HUAWEI] stack
    [~HUAWEI-stack] stack member all link-type mainboard-direct
    [*HUAWEI-stack] commit
    
  3. Save the configuration and then restart the stack to make the configuration take effect.

4.1.57  How Do I Calculate the Stack Bandwidth?

The formula for calculating the stack bandwidth is: Stack Bandwidth = Number of stack member ports in stack ports x Bandwidth of a single stack member port. For example, if two switches set up a stack using four 10GE ports, the stack bandwidth is 40 Gbit/s (4x10G).

4.1.58  Can I Increase the Number of Stack Links After a Stack Has Been Set Up?

After a stack has been set up, you can increase the number of stack links as required. To add more stack links, add new ports to stack ports and then connect these new ports using cables. In this process, you do not need to remove stack cables or restart the stack.

  1. Add new ports to stack ports.
    <HUAWEI> system view
    [~HUAWEI] interface stack-port 1/1
    [~HUAWEI-Stack-Port1/1] port member-group interface 10ge 1/0/3 to 1/0/4
    [*HUAWEI-Stack-Port1/1] quit
    [*HUAWEI] interface stack-port 2/1
    [*HUAWEI-Stack-Port2/1] port member-group interface 10ge 2/0/3 to 2/0/4
    [*HUAWEI-Stack-Port2/1] commit
    
  2. Connect these new ports.

If you connect new ports using cables and then add these ports to stack ports, you are advised to shut down these ports before connecting them using cables and enable them after they have been added to stack ports.

4.1.59  Will the Previous Service Port Configuration of a Switch Change After this Switch Joins a Stack?

If this switch is the master switch, its service port configuration will not change. If this switch is not the master switch, it will synchronize with the configuration of the master switch, and the previous service port configuration will be lost.

4.1.60  Dual-Active Detection

4.1.60.1  How Can I Configure DAD?

A stack has two dual-active detection (DAD) modes:
  • DAD in direct mode through service ports: DAD is performed through dedicated direct links between member switches, as shown in Figure 4-7.
    Figure 4-7  DAD in direct mode
    47a67aa667824761a100321930408dd7
    Perform the following configuration:
    <HUAWEI> system-view
    [~HUAWEI] interface 10ge 1/0/1
    [~HUAWEI-10GE1/0/1] dual-active detect mode direct     //Configure DAD in direct mode on an interface.
    Warning: The interface will block common data packets, except BPDU packets. Continue? [Y/N]: y
    [*HUAWEI-10GE1/0/1] quit
    [*HUAWEI] interface 10ge 2/0/1
    [*HUAWEI-10GE2/0/1] dual-active detect mode direct
    Warning: The interface will block common data packets, except BPDU packets. Continue? [Y/N]: y
    [*HUAWEI-10GE2/0/1] commit
    
  • DAD in relay mode through Eth-Trunk interfaces: DAD is performed through an inter-device Eth-Trunk link connected to a relay agent, as shown in Figure 4-8.
    Figure 4-8  DAD in relay mode
    01e7c7e8148545348145dbb16555b5b5

    Perform the following configuration:

    # Configure DAD in relay mode on the Eth-Trunk interface in the stack.

    <HUAWEI> system-view
    [~HUAWEI] interface eth-trunk 1
    [*HUAWEI-Eth-Trunk1] trunkport 10ge 1/0/5
    [*HUAWEI-Eth-Trunk1] trunkport 10ge 2/0/5
    [*HUAWEI-Eth-Trunk1] dual-active detect mode relay      //Configure DAD on the Eth-Trunk interface.
    [*HUAWEI-Eth-Trunk1] commit
    

    # Configure the DAD relay function on the Eth-Trunk interface of the relay agent.

    <HUAWEI> system-view
    [~HUAWEI] sysname SwitchC
    [*HUAWEI] commit
    [~SwitchC] interface eth-trunk 1
    [*SwitchC-Eth-Trunk1] trunkport 10ge 1/0/1
    [*SwitchC-Eth-Trunk1] trunkport 10ge 1/0/2
    [*SwitchC-Eth-Trunk1] dual-active proxy      //Configure the relay function on the Eth-Trunk interface of the relay agent.
    [*SwitchC-Eth-Trunk1] commit
    
  • DAD through management interfaces: DAD is performed through the management interfaces of member switches, as shown in Figure 4-9.
    Figure 4-9  DAD through management interfaces
    c934f977976649eab4a11a43bfea4be9
    Perform the following configuration:
    <HUAWEI> system-view
    [~HUAWEI] interface meth 0/0/0
    [~HUAWEI-MEth0/0/0] ip address 192.168.10.1 24     //Configure an IP address for the management interface.
    [*HUAWEI-MEth0/0/0] dual-active detect enable      //Configure DAD on the management interface.
    [*HUAWEI-MEth0/0/0] commit
    

4.1.60.2  Which Ports Can Be Used to Configure DAD?

The following ports can be used to configure DAD:
  • Service port

  • Eth-Trunk port

  • Stack port (supported only when the stack is set up by CE12800s in MPU connection mode)

  • Management port

4.1.60.3  Can SIP Ports Be Used to Configure DAD?

SIP ports are only used for stack connections and cannot have DAD configured.

4.1.60.4  Can Stack Ports Be Used to Configure DAD?

Stack ports can be used to configure DAD only when the stack is set up by the CE12800s in MPU connection mode.

4.1.60.5  Can Management Interfaces Be Used to Configure DAD?

Management interfaces of stack member switches can be used to configure DAD. To configure DAD on a management interface, configure an IP address for the interface.

4.1.60.6  Must DAD Be Configured?

DAD is optional. To prevent the dual-active scenario caused by a stack split, you are advised to configure DAD in a stack.

4.1.60.7  Can Dual-Active Detection Be Performed on Ports in a VS?

Yes.

4.1.60.8  Can DAD-Enabled Ports Run Services?

Ports configured with dual-active detection (DAD) in direct mode cannot run other services. Eth-Trunks configured with DAD in relay mode can run other services properly.

4.1.60.9  Does a Blocked Port Still Support DAD After DAD in Direct Mode Is Configured on It?

The blocked port still supports DAD.

After DAD in direct mode is configured on a port, the port is blocked and processes only BPDU packets without forwarding common service packets. Because standard BPDUs are used for DAD, the DAD function is not affected when the port is blocked.

4.1.60.10  Can I Log In to a Switch That Fails the DAD Competition Through Its Management Network Port?

If a backup IP address has been configured for a switch that fails the DAD competition, you can log in to the switch through its management network port. If no backup IP address is configured for a switch that fails the DAD competition, its management network port will be disabled.

Configure a backup IP address for a switch.
<HUAWEI> system-view
[~HUAWEI] interface meth 0/0/0
[~HUAWEI-MEth0/0/0] dual-active backup ip address 192.168.1.175 24 member all
[*HUAWEI-MEth0/0/0] commit

4.1.60.11  What State Is an Eth-Trunk in After the Stack Split If DAD Is Not Configured for the Stack?

As shown in the following figure, SwitchB and SwitchC set up a stack, and SwitchA and SwitchD are dual-homed to both SwitchB and SwitchC through Eth-Trunk links.
Figure 4-10  Networking diagram
595519d4a607402d987e146b778b6a44
  • If the Eth-Trunk is configured in manual mode, no loop will occur on SwitchA and SwitchD after the stack split. The traffic forwarding paths are the same as those before the stack split, for example, SwitchA -> SwitchB -> SwitchD and SwitchA -> SwitchC -> SwitchD.

  • When the Eth-Trunk is configured in static LACP mode, the traffic forwarding paths are the same before and after the stack split if the standby switch still uses the system MAC address. If the standby switch uses its own MAC address after the stack split, traffic can only be forwarded through one port and no loop will occur. This is because, in the static LACP mode, a physical member port in the Eth-Trunk goes Down and only one physical member port can go Up.

From group: Switch
  • x
  • convention:

WoodWood
Created Sep 30, 2017 11:17:49 Helpful(0) Helpful(0)

CloudEngine Series Switches FAQs-4.1 Stack
  • x
  • convention:

Reply

Reply
You need to log in to reply to the post Login | Register

Notice Notice: To protect the legitimate rights and interests of you, the community, and third parties, do not release content that may bring legal risks to all parties, including but are not limited to the following:
  • Politically sensitive content
  • Content concerning pornography, gambling, and drug abuse
  • Content that may disclose or infringe upon others ' commercial secrets, intellectual properties, including trade marks, copyrights, and patents, and personal privacy
Do not share your account and password with others. All operations performed using your account will be regarded as your own actions and all consequences arising therefrom will be borne by you. For details, see " Privacy."
If the attachment button is not available, update the Adobe Flash Player to the latest version!
Login and enjoy all the member benefits

Login and enjoy all the member benefits

Login