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101 · Question #4

What is the purpose of floating self-IP addresses?

The correct answer is C. to define an address that allows network devices to route traffic via a single IP address. Floating self-IP addresses on F5 BIG-IP are shared addresses in a high availability pair that migrate to the active unit during failover, giving upstream network devices a single stable IP address for routing traffic.

Section 3: Load Balancing and High Availability Basics

Question

What is the purpose of floating self-IP addresses?

Options

  • Ato define an address that grants administrative access to either system at any time
  • Bto define an address that allows either system to initiate communication at any time
  • Cto define an address that allows network devices to route traffic via a single IP address
  • Dto define an address that gives network devices greater flexibility in choosing a path to forward

How the community answered

(36 responses)
  • A
    3% (1)
  • C
    94% (34)
  • D
    3% (1)

Why each option

Floating self-IP addresses on F5 BIG-IP are shared addresses in a high availability pair that migrate to the active unit during failover, giving upstream network devices a single stable IP address for routing traffic.

Ato define an address that grants administrative access to either system at any time

Floating self-IPs are not used for administrative access; administrative access is provided by non-floating self-IPs or the dedicated management interface, each statically bound to a specific unit.

Bto define an address that allows either system to initiate communication at any time

Floating self-IPs do not allow both systems to initiate communication simultaneously; they are exclusively owned by the active unit and are unavailable on the standby unit until failover occurs.

Cto define an address that allows network devices to route traffic via a single IP addressCorrect

A floating self-IP is always owned by the currently active BIG-IP unit in an HA pair and automatically moves to the peer unit when a failover occurs. This ensures that routers and switches can maintain a single static next-hop or routing target without needing to update their routing tables, providing transparent failover for all traffic flowing through the BIG-IP.

Dto define an address that gives network devices greater flexibility in choosing a path to forward

Floating self-IPs provide a single consistent address for routing, not greater path flexibility; path selection flexibility is a routing protocol concern, not a function of floating self-IPs.

Concept tested: F5 BIG-IP floating self-IP purpose in high availability

Source: https://techdocs.f5.com/en-us/bigip-15-1-0/big-ip-tmos-routing-administration/self-ip-addresses.html

Topics

#floating self-IP#high availability#routing#redundant pair

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