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PR1358019 - Traffic might be blocked on MX with MS-MPC/MS-MIC

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Article ID: TSB17692 TECHNICAL_BULLETINS Last Updated: 24 Jan 2020Version: 3.0
Alert Type:
PSN - Product Support Notification
Product Affected:
MX with MS-MPC or MS-MIC
Alert Description:

PR1358019 - On MX Series platforms with MS-MPC or MS-MIC, if a large sum of similar packets (for example, thousands of packets) are received, because of the flaw in the method to process these packets, data/management path was completely blocked and deadlocked. Eventually, traffic might be blocked.


When the MS-MPC/MS-PIC is in this state, you will see similar syslog messages:

May  1 12:05:04  MSRouter-RE0 fpc1 Transient flow-control asserted by MAC on ms-1/0 for 4 seconds
... <multiple times once per second> ...
May  1 12:05:07  MSRouter-RE0 fpc1 Transient flow-control asserted by MAC on ms-1/0 for 4 seconds
May  1 12:05:08  MSRouter-RE0 fpc1 Prolonged flow-control asserted by MAC on ms-1/0, bringing interface down 
May  1 12:05:08  MSRouter-RE0 fpc1 ms-1/0: MAC stuck, trigger coredump via nmi
Solution:
The cause is a software defect appears in Junos software version 15.1. The software defect has been corrected and integrated in the following Junos software versions:
  • junos:16.1R7-S5
  • junos:16.2R3
  • junos:17.2R2-S7
  • junos:17.3R3-S5
  • junos:17.4R2-S4
  • junos:17.4R3
  • junos:18.2R2-S3
  • junos:18.2R3
  • junos:18.3R3
  • junos:18.4R1-S5
  • junos:18.4R2
  • junos:19.1R1-S2
  • junos:19.1R2
  • junos:19.2R1
  • junos:19.3R1 or later
Additional fixes may be integrated at the later time, please check PR1358019 for the most current information.
 
Implementation:
The software defect has been corrected. Juniper Networks recommended customers using MS-MPC and MS-MIC to upgrade to Junos software with the fix.
Please contact JTAC if you have any questions about this issue - PR1358019
Modification History:
First publication 2019-12-26

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