Note : The example in this document is based on Cisco Catalyst switches configured as Stackwise-Virtual. Also verify if ISSU is supported between current code and target code. The images are upgraded in install mode wherein each package is upgraded individually. ISSU helps network administrators avoid a network outage when performing a software upgrade. In-Service Software Upgrade ISSU is a process that upgrades an image to another image on a device while the network continues to forward packets. The objective of this document is to help understand the steps involved in performing ISSU on Catalyst and Catalyst series switches. Category : Cisco 3850 ios upgrade install mode
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