When an explicit failover order has been configured on a virtual switch with multiple uplinks, what
determines which uplink is used when a failover event occurs?
A.
The first available uplink that reports a positive link state
B.
The reported uptime for the surviving uplinks
C.
The next available uplink on the list
D.
The uplink with the shortest route
B is incorrect. The answer should be C.
B would be correct if NO Explicit Failover order had been configured, but the questions states that it has been configured, making C the correct answer.
“Failover is implemented by the VMkernel based upon configurable parameters
1. Failover order: Explicit list of preferred links (uses highest-priority link which is up) [C above]
2. 1. Maintains load balancing configuration
2. Good if using a lower bandwidth standby NIC
3. Rolling failover — preferred uplink list sorted by uptime [B above]”
The answer is C.
There is either an error in the question, or in the answer here. Most instances of this question state “when explicit failover has NOT been configured”, aka rolling failover. Then B – the longest uptime uplink is the answer.
This question asks “When an explicit failover order HAS been configured” and therefore the correct answer is C – The next available uplink on the list.
Explaination
http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.networking.doc_50%2FGUID-D5EA6315-5DCD-463E-A701-B3D8D9250FB5.html
Use explicit failover order:
Always use the highest order uplink from the list of Active adapters that passes failover detection criteria.
TO SUMMARIZE:
When an explicit failover order HAS been configured on a virtual switch with multiple uplinks
-> The next available uplink on the list
When an explicit failover order has NOT been configured on a virtual switch with multiple uplinks
-> The reported uptime for the surviving uplinks