Issu Command Series - HP 12500 Configuration Manual

system keeps forwarding packets. After startup, the CPU continues to provide services on the basis
of the saved system information. For services that require regular protocol message exchanges to
maintain connections, this method starts protocol agents to satisfy the requirements.
Compared with an incremental upgrade, an ISSU reboot upgrade affects all modules that use the
CPU and takes a longer time. An ISSU reboot upgrade is usually performed when the new and old
software versions are partially compatible.
Reboot (in standalone mode)
•
A reboot upgrade reboots cards to load the new software.
When the device has two MPUs and both MPUs need to be rebooted for upgrade, upgrade the
standby MPU first to implement in-service upgrade. If the device has only one MPU, service
interruption is unavoidable during the upgrade.
Specially, the upgrade method of a switching fabric card might be Sequence Reboot. This method
reboots one switching fabric card at a time and proceeds to reboot another switching fabric card
only when the previously upgraded one restarts up. This method can implement in-service
switching fabric card upgrade when the device has multiple switching fabric cards that support
this method.
• Reboot (in IRF mode)
A reboot upgrade reboots cards to load the new software.
When a member device of the IRF fabric has two MPUs and both MPUs need to be rebooted for
upgrade, upgrade the standby MPU first to implement in-service upgrade. If a member of the IRF
fabric has only one MPU, service interruption is unavoidable during the upgrade.
Specially, the upgrade method of a switching fabric card might be Sequence Reboot. This method
reboots one switching fabric card at a time and proceeds to reboot another switching fabric card
only when the previously upgraded one restarts up. This method can implement in-service
switching fabric card upgrade when the device has multiple switching fabric cards that support
this method.

ISSU command series

To perform an ISSU, you can use either of the install series commands or the issu series commands.
13 compares these two series of commands.
Table 13 Comparison between the two series of commands
Item
Required compatibility
between the old and new
software versions
Support installing and
uninstalling patches?
Upgrade mode
Effect scope of the
upgrade operation
Requirement for
administrators
issu series commands
Compatible or incompatible.
No.
Upgrade an IRF fabric as per
member device.
Large.
Low, applicable to most
administrators.
113
install series commands
Compatible.
Yes.
Advanced upgrade mode, upgrade the
system as per MPU.
Small.
High. Administrators must have a
profound understanding of the system and
the effects of each upgrade action.
Table