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201 · Question #316

When upgrading a BIG-IP redundant pair, what happens when one system has been updated but the other has not?

The correct answer is A. Synching should not be performed. When BIG-IP devices in a redundant pair are running different software versions during an upgrade, configuration synchronization must be avoided to prevent potential issues or configuration corruption.

Section 4: Maintain a BIG-IP Device

Question

When upgrading a BIG-IP redundant pair, what happens when one system has been updated but the other has not?

Options

  • ASynching should not be performed.
  • BThe first system to be updated will assume the Active role.
  • CThis is not possible since both systems are updated simultaneously.
  • DThe older system will issue SNMP traps indicating a communication error with the partner.

How the community answered

(40 responses)
  • A
    73% (29)
  • B
    5% (2)
  • C
    15% (6)
  • D
    8% (3)

Why each option

When BIG-IP devices in a redundant pair are running different software versions during an upgrade, configuration synchronization must be avoided to prevent potential issues or configuration corruption.

ASynching should not be performed.Correct

It is critical to avoid performing a configuration synchronization (ConfigSync) between BIG-IP systems that are running different software versions, as doing so can lead to configuration inconsistencies or corruption.

BThe first system to be updated will assume the Active role.

The active/standby role is determined by failover conditions and configured priorities, not solely by which system was updated first.

CThis is not possible since both systems are updated simultaneously.

BIG-IP redundant pairs are typically upgraded one system at a time in a rolling upgrade fashion to maintain service availability, making simultaneous updates an undesirable practice.

DThe older system will issue SNMP traps indicating a communication error with the partner.

While there might be differences in behavior or warnings, the primary concern when systems are on different versions is the risk of configuration synchronization issues, not necessarily an immediate communication error indicated by SNMP traps.

Concept tested: BIG-IP HA upgrade best practices and ConfigSync compatibility

Source: https://techdocs.f5.com/en-us/big-ip-system-management/big-ip-system-and-hardware-installation-guide-16-1/upgrading-or-reinstalling-the-software.html

Topics

#BIG-IP upgrade#redundant pair#configuration sync#version mismatch

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