101 · Question #9
When network failover is enabled, which of the following is true.
The correct answer is C. A network failure will not cause a failover as long as there is a voltage across the failover cable.. When network failover is enabled on F5 BIG-IP, the hardware failover cable voltage serves as the authoritative health signal, preventing network-triggered failovers when the cable indicates the peer device is still operational.
Question
When network failover is enabled, which of the following is true.
Options
- AThe failover cable status is ignored. Failover is determined by the network status only.
- BEither a network failure or loss of voltage across the failover cable will cause a failover.
- CA network failure will not cause a failover as long as there is a voltage across the failover cable.
- DThe presence or absence of voltage over the failover cable takes precedence over network failover.
How the community answered
(35 responses)- A3% (1)
- C91% (32)
- D6% (2)
Why each option
When network failover is enabled on F5 BIG-IP, the hardware failover cable voltage serves as the authoritative health signal, preventing network-triggered failovers when the cable indicates the peer device is still operational.
The failover cable status is not ignored - it directly overrides network-based failover decisions when voltage is present on the cable.
A network failure alone will not cause failover if voltage is present on the failover cable, so the 'either/or' condition described is incorrect.
When network failover is enabled, F5 BIG-IP treats the presence of voltage across the hardware failover cable as confirmation that the peer device is healthy and reachable. Because the cable voltage indicates the standby unit is alive, a network failure alone will not trigger a failover event while that voltage is detected.
While cable voltage does influence failover decisions, this option misstates the relationship - network failover is subordinate to cable voltage presence, not simply overridden symmetrically in both voltage states.
Concept tested: F5 BIG-IP network vs hardware failover precedence
Source: https://techdocs.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/bigip-device-service-clustering-administration-13-0-0/4.html
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