Alert Type

PSN - Product Support Notification

Product Affected

MX, EX9200, PTX and QFX series routers running EVPN services

Alert Description

EVPN routing-instances went through major internal design changes in the following JUNOS software versions. Due to software defects in this new implementation, a race condition can happen between two daemons consuming EVPN states while creating a new EVPN instance. This condition will result in the related L2 interfaces flap on any subsequent commits including unrelated changes. As a result of interfaces flap, the router will flood control plane messages causing major network events.
 

Trigger:

  • EVPN routing instance is configured
  • Any subsequent commit involving interface changes (AE/NON-AE with or without ESI) in EVPN routing instance or when both REs are rebooted at the same time.
Workaround: 

Manually restart the DCD process during MW to sync up BD index.

Affected JUNOS software releases:

  • 17.1R3 17.3R3-S3
  • 18.1R3-S2 18.1R3-S3
  • 18.2X75-D40
  • 18.3R1 18.3R2
  • 18.4R1
  • 19.1R1

 

Solution

The software defect has been corrected. Please check https://prsearch.juniper.net/PR1425339 for JUNOS software with the fix (login required.)

Modification History

First publication date 2019-05-17

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