PR1425339 - EVPN interface flaps when committed affects JUNOS 17.1R3 17.3R3-S3 18.1R3-S2 18.1R3-S3 18.2X75-D40 18.3R1 18.3R2 18.4R1 19.1R1

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PR1425339 - EVPN interface flaps when committed affects JUNOS 17.1R3 17.3R3-S3 18.1R3-S2 18.1R3-S3 18.2X75-D40 18.3R1 18.3R2 18.4R1 19.1R1

Article ID: TSB17573 TECHNICAL_BULLETINS Last Updated: 06 Feb 2020Version: 7.0

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