Issu Overview; Performing An Issu Upgrade; Issu Upgrade In Standalone Mode; Issu Upgrade In Irf Mode - HP A7500 Series Configuration Manual

ISSU overview

In-Service Software Upgrade (ISSU) provides easy and fast device software upgrades by upgrading
main processing units (MPUs) through use of the active and standby switchover mechanism. It ensures
non-stop services during the upgrade process.
ISSU also provides a version rollback function to enable fast version rollback, and provides relevant
display commands to help you understand version compatibility information and verify the state of the
upgrade process. ISSU provides more functionality than other upgrade methods. HP recommends that
you use ISSU to upgrade your switch.

Performing an ISSU upgrade

Before performing an ISSU upgrade, download the system software image to all the MPUs.

ISSU upgrade in standalone mode

Upgrade the standby MPU when the active MPU is in normal operation.
1.
Execute the issu run switchover command. The active MPU re-starts and the standby MPU becomes
2.
the active one.
Upgrade the current standby MPU and LPUs.
3.

ISSU upgrade in IRF mode

MPU-based ISSU upgrade process
An IRF fabric typically has one active MPU, multiple standby MPUs, and multiple LPUs. The upgrade
process includes the following steps:
Upgrade the standby MPU of the master while the master's active MPU is operating.
1.
Perform an active and standby switchover to make the upgraded standby MPU the new active
2.
MPU of the IRF fabric.
Upgrade all the other MPUs one by one.
3.
The ISSU upgrade is complete after all cards have been upgraded to the new version.
To use this method, the master must have two MPUs and the old and new software versions must be
compatible.
Member switch-based ISSU upgrade process
The member switch-based upgrade process includes the following steps:
Reboot a slave switch to upgrade it while the master is operating normally.
1.
Trigger a master election to make the slave switch become the new master.
2.
Reboot the former master to complete upgrading the whole IRF fabric.
3.
TIP:
To avoid a reboot causing service interruption, aggregate links across member switches.
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