Due to a software defect, the data structure associated with in-line JFLOW feature on Trio-based FPCs may not be initialized correctly. This leads to a failure to forward transit traffic. This defect is documented via the  PR1377500 .
This software defect affects the following JUNOS software version:

• 16.1R4 and later
• 17.1R1 and later
• 17.2R1 and later
• 17.3R1 and later
• 17.4R1 and later
• 18.1R1 and later
• 18.2R1 and later
• 18.3R1 and later

The software defect has been identified and in the process of integrating into JUNOS software. Please check PR1377500 for the JUNOS Software versions with the fix.

The software defect is in the process of integrating the fix into affected software releases. Please check PR1377500 for JUNOS version with the fix.
If you are using JFLOW with Trio-based FPCs, we recommended that you do not deploy the affected JUNOS software releases.

First publication date 2018-11-27

• PR1377500 - Data Structure uses for in-line JFLOW on Trio-based FPCs may not be initialized correctly leading to loss of transit traffic