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] 'Temperature Warm' alarm appears after inserting MPC5E module



Article ID: KB36907 KB Last Updated: 05 May 2021Version: 1.0

After a new MPC5E module was inserted, a 'warm temperature' alarm is displayed. 


A new chassis alarm is seen after a new MPC module was inserted into slot 2. From "show chassis hardware | match fpc", it is a MPC5E module. Note that there are other types of MPC cards present in the chassis.

mx960> show chassis alarms | no-more
1 alarms currently active
Alarm time               Class  Description
2021-03-25 14:27:55 UTC  Minor  Temperature Warm

FPC 0            REV 41   750-028467   ABCV4836          MPC 3D 16x 10GE
FPC 1            REV 41   750-028467   CAEC4746          MPC 3D 16x 10GE
FPC 2            REV 77   750-045715   CANA5817          MPC5E 3D Q 24XGE+6XLGE
FPC 5            REV 18   750-045372   CADW4253          MPCE Type 3 3D
FPC 7            REV 41   750-028467   CACY3692          MPC 3D 16x 10GE
FPC 8            REV 20   750-038493   CAEE0301          MPCE Type 2 3D Q
FPC 9            REV 41   750-028467   ABCM8209          MPC 3D 16x 10GE

From the chassisd log, the chassis temperature is reported over 75 degrees C, but no fan/impeller failure is detected.

Mar 25 14:27:04  chassisd[3263]: %DAEMON-4-CHASSISD_HIGH_TEMP_CONDITION: Chassis temperature over 75 degrees C (but no fan/impeller failure detected)
Mar 25 14:27:04  alarmd[3672]: %DAEMON-4: Alarm set: Temp sensor color=YELLOW, class=CHASSIS, reason=Temperature Warm
Mar 25 14:27:04  craftd[3265]: %DAEMON-4: Minor alarm set, Temperature Warm
Mar 25 14:27:05  inetd[3270]: %DAEMON-4: /usr/sbin/sshd[33075]: exited, status 255
Mar 25 14:27:45  alarmd[3672]: %DAEMON-4: Alarm cleared: Temp sensor color=YELLOW, class=CHASSIS, reason=Temperature Warm
Mar 25 14:27:45  craftd[3265]: %DAEMON-4:Minor alarm cleared, Temperature Warm

This alarm may be trigged by the MPC5E module, which was confirmed from the temperature information on each component of the chassis.

mx960> show chassis environment no-forwarding
Class Item                           Status     Measurement
      FPC 2 PLX PCIe Switch TSe      OK         57 degrees C / 134 degrees F
      FPC 2 PLX PCIe Switch Chi      OK         76 degrees C / 168 degrees F

This is a temperature evaluation algorithm issue.

There was an algorithm change in Junos specific to MPC5E in terms of how temperatures are reported. For fixed Junos releases, refer to PR1199447 - An enhancement for implementing sensor-specific temperature thresholds is needed On MX240/480/960 and EX9200 platforms

 In the scenario above, the user was on Junos release 15.1F2-S20, which does not have the enhancement for MPC5E module.
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