5.2. Required Networks, Optional Networks

Red Hat Gluster Storage Console distinguishes between required networks and optional networks.
Required networks must be applied to all hosts in a cluster for the cluster and network to be Operational. By default, Logical networks are added to clusters as Required networks.
Click Manage Networks to change a network's Required designation. Optional networks are those logical networks that have not been explicitly declared Required networks. Optional networks can be implemented on only the hosts that use them. The presence or absence of these networks does not affect the Operational status of a host.