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201 · Question #94

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 configured, the BIG-IP system's hardware failover cable status often takes precedence, preventing a failover if the cable remains healthy despite network communication issues.

Section 6: Configure High Availability

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 fail over cable takes precedence over network failover.

How the community answered

(60 responses)
  • A
    2% (1)
  • B
    5% (3)
  • C
    92% (55)
  • D
    2% (1)

Why each option

When network failover is configured, the BIG-IP system's hardware failover cable status often takes precedence, preventing a failover if the cable remains healthy despite network communication issues.

AThe failover cable status is ignored. Failover is determined by the network status only.

The failover cable status is generally not ignored and serves as a critical indicator, especially in conjunction with network failover.

BEither a network failure or loss of voltage across the failover cable will cause a failover.

With hardware failover present, a network failure alone will not necessarily trigger a failover if the failover cable connection is still active.

CA network failure will not cause a failover as long as there is a voltage across the failover cable.Correct

In BIG-IP systems, when both network failover and a hardware failover cable are configured, the presence of voltage across the failover cable often signifies the peer is still operational and connected, overriding network-based failover triggers. This mechanism prevents unnecessary failovers in situations where network communication might temporarily drop, but the peer device itself is still physically connected and functioning.

DThe presence or absence of voltage over the fail over cable takes precedence over network failover.

While true that hardware failover can take precedence, option C provides a more specific and accurate description of the interaction in a failover scenario.

Concept tested: BIG-IP network and hardware failover interaction

Source: https://my.f5.com/manage/s/article/K13936

Topics

#Network failover#Hardware failover#High Availability#Failover precedence

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