This article explains why sometimes the kernel database constantly shows it is synchronizing.

lab> show system switchover 
Graceful switchover: On
Configuration database: Ready
Kernel database: Synchronizing
Peer state: Steady State

This indicates the kernel database is synchronizing. It is displayed when there are updates within the last 5 seconds.

This is expected if there is an update within the last 5 seconds. It does not indicate any issues.

To confirm this, enable replication traceoptions:

set system kernel-replication traceoptions file kernal-replication-traceoptions
set system kernel-replication traceoptions file size 10m
set system kernel-replication traceoptions file files 10
set system kernel-replication traceoptions flag all
set system kernel-replication traceoptions level detail

To check GRES status, use 'request chassis routing-engine master switch check' instead of 'show system switchover' .

Kernel database does not check the backup database. It only checks whether replication kernel is receiving state updates from the primary or not. This should not be used for GRES readiness check.

GRES is ready in this case:

lab> request chassis routing-engine master switch check
Switchover Ready

2021-03-24: Updated the article terminology to align with Juniper's Inclusion & Diversity initiatives

• show system switchover
• request chassis routing-engine master