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How to stop/abort In-Service Software Upgrade (ISSU) process in case it stalls in the middle of the upgrade

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Article ID: KB19500 KB Last Updated: 25 Jul 2019Version: 3.0
Summary:
How to stop/abort In-Service Software Upgrade (ISSU) process in case it stalls in the middle of the upgrade
Symptoms:
At times, customers would like to upgrade their production SRX cluster devices with minimal downtime, and most often the practice followed is to use the ISSU process to achieve this.
It so happens that at times, ISSU may not complete correctly which lead to cluster problems including session synchronization and correct recognition of peer.

 
Solution:
If the system did not complete the ISSU process, perform the following steps to completely stop the ISSU process and rollback to previous state.
  •  If both nodes completed the upgrade (verify with the command 'show version') run the following commands on both nodes simultaneously to rollback to the previous Junos version.
request chassis cluster in-service-upgrade abort
request system software rollback
request system reboot
 
  • If only one node completed the upgrade (verify with the command 'show version') run the following commands:
    1. On the upgraded node
      request chassis cluster in-service-upgrade abort
      request system software rollback node local
    2. On the node that did not complete the upgrade
      request chassis cluster in-service-upgrade abort
    3. On both nodes after completing the above steps
      request system reboot
  • If neither node completed upgrade successfully (verify with the command 'show version') run the following commands on both nodes simultaneously to rollback to the previous Junos version
    request chassis cluster in-service-upgrade abort
    request system reboot


Refer to KB17946 for ISSU non-supported features that may impact ISSU upgrades.
Refer to KB17947 for minimal downtime upgrade procedure.
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