HP A7500 Series Command Reference Manual page 151

If the file specified by upgrading-filename is compatible with the system software image, you do not
•
need to provide this keyword to perform the ISSU upgrade.
Description
In standalone mode
1.
Use the issu load command to upgrade the standby MPU.
Execution of the issu load command is the first step in the ISSU upgrade process.
With this command executed, the system automatically performs the following operations:
• Checks version compatibility: If the versions are incompatible and the force keyword is not provided,
the system quits the upgrade process.
Creates a rollback timer on the active MPU.
•
• Sets the system software image for the standby MPU and reboots the standby MPU.
Performs version compatibility check and protocol negotiation check after the standby MPU
•
reboots with the new system software image.
Performs the next upgrade step.
•
Before executing the issu load command, verify the following conditions:
The active MPU and the standby MPU use the same system software image, the same file path,
•
name, and content.
• The new system software image and the old system software image both exist on the active MPU
and the standby MPU respectively, and the files are saved on the root directory of the storage
medium of the same type.
The standby MPU is in a real-time backup state, which you can display with the display switchover
•
state command.
• With incompatible versions, save the configuration to the active MPU and standby MPU with the
save command.
To avoid upgrade failure, do not modify the configuration, reboot a card, perform an active and standby
switchover, delete or modify the system software image, or load or unload a hotfix during the ISSU
upgrade.
In IRF mode
2.
Use the issu load file upgrading-filename chassis chassis-number [ force ] command to upgrade the
specified slave switch. Use this command when you apply the member switch-based ISSU upgrade
method.
Use the issu load file upgrading-filename chassis chassis-number slot slot-number [ force ] command to
upgrade the standby MPU of the master. Use this command when you apply the MPU-based ISSU
upgrade method.
Execution of the issu load command is the first step in the ISSU upgrade process.
You can upgrade an IRF fabric with ISSU through any of the following methods:
MPU-based ISSU upgrade. When this method is applied, an IRF fabric is considered a distributed
•
switch with one active MPU, multiple standby MPUs, and multiple LPUs. The upgrade process is as
follows:
Upgrade the standby MPU of the master when the active MPU of the IRF fabric operates normally.
Perform an active and standby switchover, making the upgraded standby MPU become the new standby
MPU of the IRF fabric. Upgrade each LPU by installing a hotfix.
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