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The goal of this article is to provide information and the procedure for upgrading SRX chassis clusters with minimal downtime as an alternative to ISSU/ICU.Image Added

Check version and feature supported

https://kb.juniper.net/InfoCenter/index?page=content&id=KB17947KB17946&actp=METADATA

ICCU ( on SRX3xx and SRX5xx and SRX1500)

• Drop in traffic (30 seconds approximately)

• Loss of security flow sessions

https://www.juniper.net/documentation/en_US/junos/topics/task/operational/chassis-cluster-upgrading-and-aborting-backup-and-primary-device-with-icu.html

ISSU:

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/security-chassis-cluster-upgrading-using-in-service-software-upgrade.html