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In-Service Software Upgrade
In-Service Software Upgrade
The In-Service Software Upgrade (ISSU) feature is used to upgrade switch software with minimal disrup-
tion to data traffic.
ISSU Specifications
CMMs
Image Files
Validation File
ISSU Directory
Default NI Reset Timer
Control LED
The Validation File
The Validation File contains the information required to validate that an ISSU upgrade is possible. An
ISSU upgrade is dependant upon the current version of software on the switch and the version of software
the switch is being upgraded to. If the version of code on the switch is not ISSU compatible with the
version being upgraded, the ISSU upgrade will not be allowed and an error message similar to the one
below will be displayed:
Tue Dec 14 14:19:15 : ChassisSupervisor issuMgr alert message:
+++ ISSU Image Validation Failed - aborting ISSU
ERROR: ISSU Validation Error: Images not issu compatible
•
Image files and the 'issu_version' file are available from Service & Support.
•
View the 'issu_version' text file to determine ISSU compatibility between code versions before
attempting an ISSU upgrade or contact Service and Support.
Resetting NIs
After performing an ISSU upgrade the NIs must be reset to complete the ISSU upgrade. They can be reset
manually using the 'issu slot' or 'reload slot'commands. If the NIs are not reset by the time the NI reset
timer expires, they will be reset individually by the system in ascending order beginning with slot 1.
ISSU Guidelines
•
The current and new versions of code must be ISSU compatible.
•
To complete an ISSU upgrade NIs must be reset either manually or automatically.
•
NIs can be manually reset one right after the other. However, it's recommended to wait until the
previous NI is operational before resetting the next NI.
•
No configuration is allowed until the entire ISSU upgrade process is complete, including NI reset.
page 3-24
Must be synchronized and certified redundant
CMMs
Ros.img
Reni.img
issu_version
Any user-defined directory to store the image files.
120 minutes
Blinks amber during ISSU upgrade
OmniSwitch AOS Release 7 Switch Management Guide
Managing CMM Directory Content
March 2011
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