Virtual LAN (VLAN) tagging is an optional setting that enables a cluster to participate in multiple virtual networks.

You can partition a physical network into multiple broadcast domains, or virtual local area networks (VLANs). You can enable a cluster to participate in a VLAN which allows multiple cluster subnet support without multiple network switches; one physical switch enables multiple virtual subnets.

VLAN tagging inserts an ID into packet headers. The switch refers to the ID to identify from which VLAN the packet originated and to which network interface a packet should be sent.