Issu Methods For A Compatible Version - HP 10500 Series Configuration Manual

ISSU method
Incompatible upgrade

ISSU methods for a compatible version

The following are ISSU methods for a compatible version:
Incremental upgrade:
•
An incremental upgrade analyzes the differences between the new and old software versions and
upgrades only the different parts. An incremental upgrade takes the least time and imposes the
least effect on the device.
Incremental upgrade methods include:
Service-level incremental upgrade—This method involves only the upgraded service modules.
The other service modules can provide services during the upgrade.
File-level incremental upgrade—This method involves only hidden system program files. The
system can operate and provide services during the upgrade.
ISSU reboot:
•
An ISSU reboot upgrade saves the current system information (including the operation data,
configuration data, hardware data, and status information) to memory and uses the new software
to reboot the CPU. During an ISSU reboot upgrade, the data plane of the 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 meet the requirements.
Compared with an incremental upgrade, an ISSU reboot upgrade affects all modules that use the
CPU and takes a longer time.
Reboot (in standalone mode):
•
A reboot upgrade reboots cards to load the new software.
If the device has two MPUs and both MPUs need to be rebooted for the 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
the upgrade, upgrade the standby MPU first to implement in-service upgrade. When 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
Application scenario
Upgrade to an incompatible version
117
ISSU method indicated by the
display version comp-matrix
file command
Incompatible upgrade