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Cisco Bug: CSCvt31934 - AA VNF ownership transfer can happen independent of local/geo switchover

Last Modified

May 31, 2020

Products (1)

  • Cisco Elastic Services Controller

Known Affected Releases

5.0 5.1

Description (partial)

Symptom:
ESC's VNF load sharing (ownership) manager will transfer all VNFs managed by a cluster node to a new node on detection of a critical service fault.  Once VNF ownership begins the process completes until all VNFs are transferred.  

Under high load conditions it is possible for a spurious node fault to occur and clear quickly without causing a switchover. 
 Since ownership transfer can not be terminated once started, a condition can latch where both the initial and new cluster elements are actively managing a VNF. 

This dual ownership syndrome can exhibit the following behaviours on new NB management requests against the VNF: 

1> A new request can result in FAILED_TEMP (ETSI) as ownership transfer is in process (recoverable).
2> A new request is processed by both ESC nodes causing the operation to fail and loss of downstream management ability.

Conditions:
ESC is under high load or is resource constrained causing a spurious service health check failure.
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