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Cisco Bug: CSCuq29087 - Periodic BFD Session Flaps on CSR1000v running 3.13.0

Last Modified

Jan 27, 2017

Products (1)

  • Cisco Cloud Services Router 1000V Series

Known Affected Releases

15.4(3)S

Description (partial)

Symptom:
The primary symptom in this case is intermittent BFD session flaps on the CSR.  The session flaps occur when the CSR does not send necessary BFD control packets within the appropriate time interval.  Those packets are late because the associated timer events are lost.  Bad host BIOS settings that increase the time it takes the VM to resume running on a physical processor can aggravate this issue.

Conditions:
CSR VM running on vSphere 5.5 (should only affect VMs > 2 vCPUs)
More likely to occur on host with less than optimal BIOS settings related to power management
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