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.
Interface
Recommended Function(s)
Speed
eth0
Management (internal), Autofailover HA
100 Mb
eth1
Management, Cluster, & Listener
10 Gb
eth2
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
out-of-band
(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
in-band
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
support.f5.com
.