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PR1487691 - RPD's bgpio thread goes into high CPU utilization when the outgoing BGP updates queue is full

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Article ID: TSB17725 TECHNICAL_BULLETINS Last Updated: 21 Feb 2020Version: 3.0
Alert Type:
PSN - Product Support Notification
Product Affected:
JUNOS Software with BGP
Alert Description:
RPD goes into high CPU utilization causing slow BGP network convergence on a large scale setup. The high CPU utilization of the BGP IO thread (bgpio) happens when the outgoing BGP update queue is full. The typical situation is a BGP Route-Reflector (RR) sending a large number of BGP updates (900K routes) to a large number of slow peers (more than 200 RR clients). This issue is the side-effect of PR1351639.
This issue affects the following JUNOS software versions:
  • 16.1R7-S5-J1 (JSU package only and not affects 16.1R7-S5)
  • 16.1R7-S6
  • 17.2R1-S9 17.2R3-S3
  • 17.3R3-S7
  • 17.4R2-S7-J3 (JSU package only and not affects 17.4R2-S7)
  • 17.4R2-S8-J1 (JSU package only and not affects 17.4R2-S8)
  • 17.4R2-S9
  • 17.4R3
  • 18.1R3-S8
  • 18.2R2-S6 18.2R3-S2
  • 18.2X75-D40 18.2X75-D50 18.2X75-D60 18.2X75-D420
  • 18.3R1-S6, 18.3R3
  • 18.4R1-S5, 18.4R2-S2, 18.4R3
  • 19.1R1-S4, 19.1R2
  • 19.2R1-S2, 19.2R2
  • 19.3R1, 19.3R1-EVO 19.3R2
  • 19.4R1‚Äč
Solution:
We are working on the software fix for this issue. We use PR1487691 to track this issue. In the meantime, we recommend customers with large BGP networks to hold off deploying JUNOS software with the change introduced by PR1351639

You can get the latest status --- including the software version with the fix --- by visiting PR1487691.
Implementation:
We will update this TSB when the software is available.
Modification History:
First publication 2020-02-13
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