F5 Cloud Failover

Welcome to the F5 Cloud Failover User Guide. To provide feedback on this documentation, you can file a GitHub Issue.

Introduction

F5 Cloud Failover (CF) is a solution for those who want L3 failover functionality for their BIG-IP systems in a cloud environment. F5 Cloud Failover uses an iControl LX extension to provide this functionality, effectively replacing Gratuitous ARP (GARP), by moving or updating certain cloud resources during a failover event, as described below.

  • Failover IP(s) - Update IP configurations on a NIC, update EIP associations, update forwarding rule target instance, etc.
  • Failover Route(s) - Update User-Defined Routes (UDR), update route table, etc.

The diagram below shows a typical failover scenario for an active/standby pair of BIG-IP systems in an Azure cloud environment.

_images/AzureFailoverExtensionHighLevel.gif

Each cloud provider has different requirements in terms of cloud resources. To see how Cloud Failover works for the different providers, see the sections for Azure, AWS, and Google.