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Cisco Bug: CSCvt48294 - HyperV opflex agent lost connectivity for 5 mins. Multiple ApicHyperV agent svc restarts

Last Modified

May 14, 2020

Products (1)

  • Cisco Application Policy Infrastructure Controller (APIC)

Known Affected Releases

3.2(3o)

Description (partial)

Symptom:
-       Issue was caused by over-subscription of the HyperV host's CPU due to concurrent migration of 37 VMs to the host. Thus causing CPU resource over-utilization of the hypervisor
- Loss of connectivity when migrating VMs to a HyperV host
- HyperV host is unable to add new VM networks for the migrated VMs 
- Because the HyperV opflex agent (aka ApicHypervAgent) is in a disconnected state
- ApicHypervAgent logs on the HyperV host show a 5 mins gap in the logs 
- Loss of opflex heartbeats (HBs) are also observed between the HyperV opflex agent and the connected Leafs
  - These HB losses are seen in OpflexElem logs on the connected Leafs
- These HB losses in OpFlexElem logs also coincide with a change of interface(s) on which the Leafs receive HBs from the 
   HyperV host
- The opflex connectivity between the Leafs and the HyperV restore automatically after 5 mins

Conditions:
- ACI Fabric running fw release 3.2(3o)
- Microsoft SCVMM & HyperV 2016
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