201 · Question #319
Assuming other failover settings are at their default state, what would occur if the failover cable were to be disconnected for five seconds and then reconnected?
The correct answer is C. When the cable is disconnected, both systems will become active. When the voltage is restored,. If the failover cable is disconnected for five seconds, both BIG-IP systems will likely transition to an active state, resulting in a split-brain scenario.
Question
Assuming other failover settings are at their default state, what would occur if the failover cable were to be disconnected for five seconds and then reconnected?
Options
- AAs long as network communication is not lost, no change will occur.
- BNothing. Failover due to loss of voltage will not occur if the voltage is lost for less than ten seconds.
- CWhen the cable is disconnected, both systems will become active. When the voltage is restored,
- DWhen the cable is disconnected, both systems will become active. When the voltage is restored,
How the community answered
(23 responses)- A4% (1)
- B9% (2)
- C83% (19)
- D4% (1)
Why each option
If the failover cable is disconnected for five seconds, both BIG-IP systems will likely transition to an active state, resulting in a split-brain scenario.
Loss of the failover cable is a critical failover event that will trigger a state change, regardless of network communication.
The default timeout for hard-wired failover is typically very short, and a five-second disconnection is usually sufficient to trigger a failover event.
By default, if the hard-wired failover cable is disconnected, the systems lose direct peer communication. Each system, unable to communicate with its partner, assumes the other has failed and transitions to an active state, resulting in a split-brain condition.
This choice is identical to C and seems to be a truncated or duplicate option; the initial effect of losing the cable is that both systems become active.
Concept tested: F5 BIG-IP hard-wired failover behavior
Source: https://support.f5.com/csp/article/K7209
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