HP A7500 Series Command Reference Manual page 156

Fundamentals
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If an LPU cannot be upgraded by installing a hotfix due to some reason (hotfix upgrade method not
supported by the LPU or failed to obtain the hotfix, for example), the LPU loads the latest version file from
the new active MPU and then reboots during the upgrade process. Traffic passing through this LPU is
interrupted, but the outage time is much shorter than the system downtime caused by system reboot
during the system upgrade process. The traffic recovery time is the sum of the boot time and recovery time
of the LPU.
For incompatible versions, executing the issu run switchover command completes the ISSU upgrade
process.
Related commands: issu load.
In IRF mode
2.
Use the issu run switchover command to manually trigger an active and standby switchover.
NOTE:
In the member switch-based ISSU upgrade process, the master reboots with the previous version and the
upgraded slave switch becomes the new master after the active and standby switchover.
In the MPU-based ISSU upgrade process, the active MPU of the IRF fabric reboots with the previous
version and the standby MPU of the master becomes the active MPU of the IRF fabric after the active and
standby switchover, and then the LPUs are upgraded by installing hotfixes.
If the previous and new versions are incompatible, you can adopt only the member switch-based
upgrade method. With the execution of the issu run switchover command, the master reboots with the
new version and the ISSU upgrade process is completed after that.
If you do not execute the issu accept or issu commit command before the specified rollback timer
expires, the system automatically stops the ISSU process and reverts to the previous software version.
Avoid configuring the system, performing an active and standby switchover, and plugging/unplugging
a card during the ISSU upgrade.
For the MPU-based ISSU upgrade method, ensure that all LPUs have their upgrade hotfixes. Otherwise,
if the LPUs upgrade by rebooting, the IRF fabric is partitioned and the upgrade fails.
Execution of this command may cause the reboot of an LPU or a member switch, and the services are
interrupted.
Related commands: issu load.
Examples
# In the ISSU upgrade process in standalone mode, perform a manual active and standby switchover to
make the upgraded standby MPU in slot 1 become the new active MPU.
<Sysname> system-view
[Sysname]
Master will reboot, switch the specified board to master and update the line card. Continue?
[Y/N]:y
# In the member switch-based ISSU upgrade process in IRF mode, perform a manual active and standby
switchover to make the upgraded slave switch with the member ID of 2 become the new master.
<Sysname> system-view
[Sysname] issu run switchover chassis 2
Master will reboot, switch the specified chassis to master. Continue? [Y/N]:y
# In the MPU-based ISSU upgrade process in IRF mode, perform a manual active and standby switchover
to make the upgraded MPU in slot 1 on chassis 1 become the global active MPU.
<Sysname> system-view
issu run switchover slot 1
149

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