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Cisco Bug: CSCvv95542 - %L2-BFD-4-ASYNC_DETECT_TIMER_FAULTY_EXPIRY happen for BLB session at link down

Last Modified

Oct 12, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)

Faulty expiry can detected at the timing of link failure as below.

LC/0/1/CPU0:Sep 23 10:13:39.904 CEST: bfd_agent[191]: %L2-BFD-4-ASYNC_DETECT_TIMER_FAULTY_EXPIRY : BFD Async Detect timer expired to neighbor X.X.X.X on interface Bundle-Ether500.403 even when async pkt received within timer duration, timer_duration=2997000 us,  2996500 us elapsed since last async pkt received

This will reset the BFD detect timer, so it will take more time for actual BFD down.

The only confirmed condition is the device is running IOS-XR 64bit (eXR)
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