You will use a router to be able to route between the VLANs for your servers and client data instead of using a layer 3 switch. It simply means routing within your network between VLANs. ROAS is usually used in small to medium sized organizations that wants to implement inter-VLAN routing. It uses a router VLAN trunking configuration to give the router a logical interface connected to each VLAN. Router-on-a-stick (ROAS) is a feature that allows us to route packets to subnets associated with VLANs connected to a router 802.1Q trunk. And on the right side of the figure, each router has a VLAN trunk to connect and route for both VLANs. Two of the switches act as Layer 3 switches, combining the functions of a router and a switch, routing between all 12 subnets/VLANs. The figure shows a central site campus LAN on the left with 10 VLANs. The example network below shows what the second and third option looks like. Use a router with a VLAN trunk connected to a LAN switch.Use a router, with one router LAN interface and cable connected to the switch for each and every VLAN (typically not used).There are three options available for connecting a router to each subnet on a VLAN: The hosts inside each subnet can then use the router IP addresses as their default gateways, respectively. Each VLAN is a separate subnet and in order to route IP packets in and out of those VLANs – or more accurately, the subnets that sit on each of those VLANs – some router needs to have an IP address in each subnet and have a connected route for each of those subnets. Router on a stick is a network configuration used to allow the routing of traffic between different VLANs.Īlmost all enterprise networks use VLANs which stands for Virtual Local Area Network.
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