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Syslog message: RPD_RT_HWM_NOTICE: New RIB/FIB highwatermark

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Article ID: KB36760 KB Last Updated: 25 May 2021Version: 3.0
Summary:

This article explains the syslog message 'RPD_RT_HWM_NOTICE', which indicates a change in the number of routes in the table.

Symptoms:

The syslog message below is seen in the 'messages' file when the severity is set for 'info' and above:
(For more info on severity settings for syslog, refer )

<timestamp>   rpd[24849]: RPD_RT_HWM_NOTICE: New FIB highwatermark for routes: 945 [timestamp in standard format]
<timestamp>   rpd[26693]: RPD_RT_HWM_NOTICE: New RIB highwatermark for unique destinations: 617 [timestamp in standard format]


Here is a real instance of how the log is seen printed in messages file:

Feb 17 11:12:44  rpd[13671]: RPD_RT_HWM_NOTICE: New FIB highwatermark for routes: 122463 [2021-02-17 11:12:44]
Cause:

The syslog message, 'RPD_RT_HWM_NOTICE' was introduced as a feature in Junos 20.2R1 and higher where the current scale is verified against that in HWM (High Watermark) every 30s and is printed in the logs if there is a difference.

The default minimum interval at which the high-watermark values are logged is 30 seconds, and is configurable:

set routing-options highwatermark-log-interval <value>
Solution:

The logs with RPD_RT_HWM_NOTICE is a feature introduced which help in troubleshooting and understanding route scale. They are strictly informational and shows you the amount of routes.

This feature is added to keep track of the maximum number of routes in the Routing and Forwarding (RIB/FIB) tables and VRFs (MX Series and PTX Series). This log has nothing to do with an impeding limit we are reaching. Capturing this log does not impact production traffic.

If these logs are not desired, they can be suppressed.

Example:

user@lab-re0# show system syslog
file messages {
     any any;
     match "!(.RPD_RT_HWM_NOTICE.)"
}
Modification History:
2021-05-03: Added a note in the Symptoms section to clarify the meaning of [time].
2021-05-18: Modified Symptoms: Removed the note and clarified the format in which the log is printed in messages file.

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