# [CHASSISD_ISSU_START](https://apps.juniper.net/syslog-explorer/?msg=CHASSISD_ISSU_START)

## SYSLOG Details
- **Message**: ISSU initiated, state <variable>state</variable>
- **Help**: chassisd initiated ISSU workflow
- **Description**: The chassisd process (chassisd) initiated an in-service software upgrade (ISSU) workflow and entered the daemon-prepare phase. This event notifies external consumers that ISSU has started.
- **Type**: Event: This message reports an event, not an error
- **Severity**: notice
- **Cause**: -
- **Action**: -
- **Attributes**: state
- **Facility**: LOG_DAEMON

## Found this message in the following releases:
- [Junos OS 26.2R1](https://apps.juniper.net/syslog-explorer/?msg=CHASSISD_ISSU_START&sw=Junos%20OS&rel=26.2R1)