Manual Chapter : Do I need multiple networks?

Applies To:

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BIG-IQ Centralized Management

  • 8.0.0
Manual Chapter

Do I need multiple networks?

The simple answer is, yes; unless you are deploying BIG-IQ for a lab or proof of concept demonstration, best practice is to use at least two interfaces. The ideal number of networks for you depends on which functions your BIG-IQ solution requires and what type of environment you deploy it on.
Although BIG-IQ can deploy using a single network subnet and interface, best practice is best to use the following networks and interfaces:
  • On eth0, an out-of-band network for internal BIG-IQ management, and autofailover high availability (HA).
  • On eth1, an in-band network for BIG-IPdevice management (BIG-IQ CM and DCD inter-node communication) and Cluster (Elasticsearch configuration and status operations) functions.
  • On eth2, an in-band network for Listener/Discovery that connects the BIG-IQ CM to the DCDs and to the managed BIG-IP devices. BIG-IQ uses this network to receive events and analytics from the BIG-IP devices.
Recommended Function(s)
Management (internal), Autofailover HA
100 Mb
Management, Cluster, & Listener
10 Gb
Management, Cluster, & Listener
10 Gb
For lab or proof of concept demonstrations, BIG-IQ can be configured to use only one interface. In this configuration all data flows through the
(OOB) interface. Also referred to as eth0, this 100 Mb interface can only handle so much.
For production use, F5 recommends a minimum of two interfaces. In this configuration only BIG-IQ management functions use the OOB interface. The rest of the data uses one of the
interfaces. Because the eth1, eth2, and eth3 interfaces are 100 times faster (10 Gb vs. 100 Mb), they are obviously much better at handling the data requirements of a production environment.
For better isolation, security, and performance F5 recommends adding additional in-band interfaces. The number of additional interfaces needed for optimal performance depends on your business needs.
A good understanding of the data flow requirements between each component in your BIG-IQ solution helps a lot when you consider how many interfaces and network subnets best suit you. For a discussion of this data flow, refer to How does data flow in a BIG-IQ solution on