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Configuration Guide - Virtualization

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of virtualization, including stack and SVF.
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Upgrading Stack Software

Upgrading Stack Software


Three methods can be used to upgrade the software version of a stack: system restart, fast upgrade, and in-service software upgrade (ISSU). The following table compares these upgrade methods.

Table 1-8 Upgrade method comparison
Upgrade Method Upgrade Mechanism Usage Scenario

System restart

After you specify the new system software to use at the next startup, the stack restarts.

This upgrade method is commonly used but will cause lengthy service interruptions. Therefore, this method applies to the scenarios insensitive to the service interruption time.

Fast upgrade

An upgrade is completed through switchovers between the stack member switches. The standby switch is upgraded first, and then the master switch.

  • This upgrade method shortens service interruptions and applies to the scenarios sensitive to the service interruption time.

  • The fast upgrade function applies only to a stack with two member switches.

  • Do not remove or reinstall optical modules or power cycle the switch during a software upgrade.

  • Ensure network stability and do not perform other service configurations on the network during a software upgrade.


  1. Upload the system software.
    1. Load the new system software to the master switch. For details on how to upload the system software, see File Management in the CloudEngine 8800, 7800, 6800, and 5800 Series Switches Configuration - Basic Configuration Guide.
    2. Run the copy source-filename all#flash: or copy source-filename destination-filename all command to copy the system software to all the member switches.
  2. Perform a software upgrade.

    • System restart

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

      2. Run the reboot command to restart the stack.

    • Quick upgrade

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

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

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

      4. (Optional) Run the stack upgrade fast rollback-timer time command to set the timeout period of a fast stack upgrade.

        By default, the timeout period of a fast stack upgrade is 60 minutes.

        To view the timeout period, run the display stack upgrade fast rollback-timer command.


        The timeout period configured in this command indicates the time taken to upgrade the standby switch instead of the entire stack.

      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.

        • Only the stack containing two member switches supports fast upgrade.

        • If 40GE high-speed cables are used to connect stack member devices, you cannot fast upgrade switches from versions earlier than V100R003C00 to V100R003C00 or a later version.

        • When 40GE QSFP+ AOC cables are used for stack connections, the stack cannot be upgraded using fast upgraded from a version earlier than V100R005C10 to V100R005C10 or a later version.

        • During a fast stack upgrade, to shorten traffic interruptions, ensure that upstream and downstream devices are dual-homed to stacked devices using Eth-Trunk.

        • It is recommended a backup IP address be configured for the stack management interface before a fast upgrade to prevent a failure to manage member devices when the stack fails the fast upgrade and splits.

Updated: 2019-04-03

Document ID: EDOC1100075367

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