C9800 ISSU Preupgrade Configuration Adjustments and Known Issues

Cisco Issu. Cisco Switch Upgrade Procedures for 9500, 9300, 9200, and 3xxx Series ISSU allows Cisco IOS software to be modified while packet forwarding continues, which increases network availability and reduces downtime caused by planned software. This document describes the steps involved to perform In-Service Software Upgrade (ISSU) on Catalyst 3850 and Catalyst 9000 series switches.

InService Software Upgrade(ISSU) on QFX5100
InService Software Upgrade(ISSU) on QFX5100 from nextheader.net

The predownload failed on the 2700, but life went on The images are upgraded in install mode wherein each package is upgraded individually.

InService Software Upgrade(ISSU) on QFX5100

ISSU is supported in dual SUP HA and StackWise Virtual system The images are upgraded in install mode wherein each package is upgraded individually. ISSU allows Cisco IOS software to be modified while packet forwarding continues, which increases network availability and reduces downtime caused by planned software.

Cisco 5G Policy Control Function (PCF) Data Sheet Cisco. The predownload failed on the 2700, but life went on ISSU is supported in dual SUP HA and StackWise Virtual system

Cisco ISE General Steps for Upgrades using Backup and Restore Method. The images are upgraded in install mode wherein each package is upgraded individually. The current Cisco IOS version running in the system must also support ISSU.