132
ISSU method
Description
Reboot
CAUTION:
The Reboot method disrupts service if hardware redundancy (MPU-, switching
fabric-, or device-level) is not available. As a best practice, schedule the downtime
carefully to minimize the upgrade impact on the services.
The Reboot method reboots MPUs to complete the software upgrade. While one
MPU is rebooting, the other MPUs can provide services.
ISSU commands
ISSU includes the
install
and
issu
command sets. After you identify the ISSU method, use
to choose the command set you want to use.
Table 14 Command set comparison
Item
issu commands
install commands
Upgrade types
•
Compatible.
•
Incompatible.
Compatible.
Patch install/uninstall
Not supported.
Supported.
Upgrade mode
Chassis by chassis.
MPU by MPU.
Applicable image types
and application scenarios
Boot image and system image
upgrade on an IRF fabric.
Feature image upgrade and system
patching on a device in standalone mode
or on an IRF fabric.
Impact on the system
Large.
Small.
Technical skill
requirements
Low.
As a best practice, use this
command set.
High.
Administrators must have extensive
system knowledge and understand the
impact of each upgrade task on the
network.
Preparing for ISSU
To perform a successful ISSU, make sure all the preparation requirements are met.
Verifying the device operating status
Verify the following items:
•
Use the
display device
command to verify that no cards are in
Fault
state.
•
Use the
display mdc
command to verify that all MDCs are in
active
state.
•
Use the
switchto mdc
command to verify that no automatic configuration process is in
progress. If an automatic configuration process is in progress on an MDC, wait for the process
to complete. If automatic configuration is not deployed for the MDC, quit the automatic
configuration process as prompted. For more information about automatic configuration, see
"
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