Support Support Downloads Knowledge Base Case Manager My Juniper Community

Knowledge Base

Search our Knowledge Base sites to find answers to your questions.

Ask All Knowledge Base Sites All Knowledge Base Sites JunosE Defect (KA)Knowledge BaseSecurity AdvisoriesTechnical BulletinsTechnotes Sign in to display secure content and recently viewed articles

[MX] "error: Standby is not synchronizing" error when trying to perform primary role switch

0

0

Article ID: KB33493 KB Last Updated: 07 Apr 2021Version: 2.0
Summary:

This article explains why the standby Routing Engine (RE) may not be ready to take over from the primary Routing Engine, and why the "error: Standby is not synchronizing" error message is output when the master switch check command is executed on the MX Series routers. It also provides a solution to resolve the issue.

 

Symptoms:

The following error and message are output:

labroot@MX> request chassis routing-engine master switch check   
error: Standby is not synchronizing

labroot@MX> show system switchover 
Graceful switchover: On
Configuration database: Ready
Kernel database: Ready
Switchover Status: Not Ready

 

Cause:

This issue is seen in Junos OS 17.1 and later releases. Before Junos OS release 17.1, the database (Berkeley DB) that was used for sync did not have a memory check between the REs. From Junos OS 17.1, we have moved from Berkeley DB to Shared Memory where both the REs must have the same amount of RAM in order for replication to work.

labroot@MX> show chassis routing-engine 
Routing Engine status:
  Slot 0:
    Current state                  Master
    Election priority              Master
    Temperature                 43 degrees C / 109 degrees F
    CPU temperature             41 degrees C / 105 degrees F
    DRAM                      16329 MB (16384 MB installed)            >>>>>>>> 16GB
    Memory utilization          10 percent
    5 sec CPU utilization:
      User                       0 percent
      Background                 0 percent
      Kernel                     1 percent
      Interrupt                  0 percent
      Idle                      98 percent
    1 min CPU utilization:
      User                       0 percent
      Background                 0 percent
      Kernel                     1 percent
      Interrupt                  0 percent
      Idle                      98 percent
    5 min CPU utilization:
      User                       0 percent
      Background                 0 percent
      Kernel                     1 percent
      Interrupt                  0 percent
      Idle                      98 percent
    15 min CPU utilization:
      User                       0 percent
      Background                 0 percent
      Kernel                     1 percent
      Interrupt                  0 percent
      Idle                      94 percent
    Model                          RE-S-1800x4
    Serial ID                      XX
    Start time                     2018-12-04 05:19:44 EET
    Uptime                         50 minutes, 7 seconds
    Last reboot reason             Router rebooted after a normal shutdown.
    Load averages:                 1 minute   5 minute  15 minute
                                       0.51       0.34       0.27
Routing Engine status:
  Slot 1:
    Current state                  Backup
    Election priority              Backup
    Temperature                 42 degrees C / 107 degrees F
    CPU temperature             41 degrees C / 105 degrees F
    DRAM                      32713 MB (32768 MB installed)                >>>>>>>> 32GB
    Memory utilization           5 percent
    5 sec CPU utilization:
      User                       0 percent
      Background                 0 percent
      Kernel                     0 percent
      Interrupt                  0 percent
      Idle                      99 percent
    Model                          RE-S-1800x4
    Serial ID                      XX
    Start time                     2018-12-04 05:19:33 EET
    Uptime                         50 minutes, 9 seconds
    Last reboot reason             Router rebooted after a normal shutdown.
    Load averages:                 1 minute   5 minute  15 minute
                                       0.17       0.21       0.17

 

Solution:

To avoid this issue, both REs should have the same amount of RAM.

 

Modification History:
2021-04-07: Updated the article terminology to align with Juniper's Inclusion & Diversity initiatives
Comment on this article > Affected Products Browse the Knowledge Base for more articles related to these product categories. Select a category to begin.

Getting Up and Running with Junos

Getting Up and Running with Junos Security Alerts and Vulnerabilities Product Alerts and Software Release Notices Problem Report (PR) Search Tool EOL Notices and Bulletins JTAC User Guide Customer Care User Guide Pathfinder SRX High Availability Configurator SRX VPN Configurator Training Courses and Videos End User Licence Agreement Global Search